TOHOKU UNIVERSITY Researchers

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Izumi Muto

Section

Graduate School of Engineering

Job title

Professor

Degree

博士（工学）（東北大学）
工学修士（東北大学）

researchmap

https://researchmap.jp/read0121284

J-GLOBAL ID

200901022643228809

ORCID

https://orcid.org/0000-0001-8309-0598

Research History 8

2014/01 - Present

Graduate School of Engineering, TOHOKU University　Professor
2007/04 - 2013/12

Graduate School of Engineering, TOHOKU University　Associate Professor
2005/04 - 2007/03

Graduate School of Engineering, TOHOKU University　Associate Professor
2003/10 - 2005/03

R & D Center, Nippon Steel & Sumikin Stainless Steel Corporation　Senior Research Chemist
1998/03 - 2003/09

Hikari R & D Laboratory, Nippon Steel Corporation　Senior Research Chemist
1994/04 - 1998/02

Steel Research Laboratories, Nippon Steel Corporation　Senior Research Chemist
1991/06 - 1994/03

Steel Research Laboratories, Nippon Steel Corporation　Research Chemist
1988/04 - 1991/05

R & D Laboratories II, Nippon Steel Corporation

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Education 3

Tohoku University　Graduate School of Engineering　Department of Metallurgy

1997/04 - 1998/03
Tohoku University　Graduate School of Engineering　Department of Metallurgy

1986/04 - 1988/03
Tohoku University　Faculty of Engineering　Department of Metallurgy

1982/04 - 1986/03

Committee Memberships 79

The Iron and Steel Institute of Japan, Division of Microstructure and Properties of Materials　Chairman

2024/04 - Present
ISO/TC156対策委員会 JWG6　委員

2006/04 - Present
ステンレス協会腐食専門委員会　委員長

2015/10 - 2025/03
ISO/TC156対策委員会 JWG2　委員

2006/04 - 2025/03
(一社)日本鉄鋼協会ステンレス鋼自主フォーラム「ステンレス鋼のミクロ組織と耐食性」　座長

2022/04 - 2024/03
ISO/TC156対策委員会 JWG7(大気腐食試験法)　委員

2006/04 - 2024/03
(一社)日本鉄鋼協会東北支部　支部長

2022/03 - 2024/02
(公社)腐食防食学会　学会誌「材料と環境」編集委員長

2021/04 - 2023/03
(公社)日本金属学会講演大会委員会　委員

2015/08 - 2023/03
(一社)日本鉄鋼協会ステンレス鋼自主フォーラム「ステンレス鋼の腐食現象のミクロ解析」　座長

2019/04 - 2022/03
(一社)日本鉄鋼協会育成委員会産学人材育成WG　主査

2016/04 - 2022/03
(一社)日本鉄鋼協会育成委員会学生鉄鋼セミナーWG　主査

2016/04 - 2022/03
(一社)日本鉄鋼協会育成委員会　委員

2016/04 - 2022/03
(公社)日本金属学会第5分科･分野　委員長

2019/04 - 2021/03
(一社)表面技術協会　理事

2019/02 - 2021/02
(公社)日本金属学会　代議員

2018/04 - 2020/03
(公社)日本金属学会第二分科委員長　委員

2017/04 - 2019/04
ステンレス協会高機能JIS原案作成委員会　委員長

2016/08 - 2018/03
(公社)腐食防食学会東北支部　支部長

2015/04 - 2018/03
NEDO革新的新規構造材料等開発プロジェクト鉄鋼分科会腐食技術委員会　委員長

2016/04 - 2018/01
(一社)日本鉄鋼協会 Galvatech'17組織委員会　委員

2015/05 - 2017/12
(公社)日本金属学会講演大会委員会　委員

2015/04 - 2017/04
(一社)表面技術協会東北支部　支部長

2015/04 - 2017/03
(一社)日本鉄鋼協会「腐食現象の数理モデル化とシミュレーション」フォーラム　座長

2015/03 - 2017/03
(社)日本金属学会分科会(第二分科)　委員

2011/03 - 2017/03
(社)日本金属学会分科会(第二分科)　委員

2011/03 - 2017/03
(一社)表面技術協会第134回講演大会実行委員会　委員

2016/06 - 2016/09
(公社)日本金属学会 PRICM9組織委員会　委員

2015/06 - 2016/08
(独)日本原子力研究開発機構　「原子力用材料の長期耐食性研究」研究嘱託(非常勤)

2014/04 - 2016/03
(社)日本鉄鋼協会　育成委員会学生鉄鋼セミナーＷＧ委員

2011/06 - 2016/03
ISO/TC156対策委員会大気腐食相関プロジェクト委員会　委員

2008/04 - 2016/03
(一社)日本鉄鋼協会革新的水素不働態表面構築の原理探求研究会　幹事

2013/03 - 2016/02
(一社)日本鉄鋼協会「鉄鋼材料と合金元素改訂版」編集委員会　委員

2013/04 - 2016/01
ステンレス協会腐食専門委員会　委員

2008/12 - 2015/09
(独)物質・材料研究機構アジア地区における構造材料の腐食マッピング検討委員会　委員

2013/06 - 2015/06
(公社)腐食防食学会　理事

2013/04 - 2015/03
(社)腐食防食協会東北支部　幹事

2006/04 - 2015/03
(一社)日本鉄鋼協会「腐食現象の数理モデル化技術の基盤構築」自主フォー　座長

2013/03 - 2015/02
(一社)表面技術協会　評議員

2013/02 - 2015/01
(独)日本原子力研究開発機構　任期付研究員研究業績評価委員

2014/02 - 2014/03
(一社)表面技術協会「JIS Z 2371(塩水噴霧試験方法)改正原案作成委員会」　委員

2013/04 - 2014/03
(財)スガウエザリング技術振興財団腐食研究委員会「グローバル大気腐食データベースの構築」プロジェクト　委員

2011/09 - 2014/03
(社)日本金属学会会報・欧文誌編集委員会　委員

2008/04 - 2014/03
(公社)腐食防食学会第60回材料と環境討論会　実行委員

2013/04 - 2013/09
ステンレス協会 JWG4 JWG7テクニカルレポート委員会　委員

2011/10 - 2013/03
(社)腐食防食協会コロージョン・セミナー企画委員会　委員長

2009/04 - 2013/03
(社)日本金属学会会報編集委員会　委員

2007/04 - 2013/03
(社)日本鉄鋼協会　腐食起点・界面のミクロ・ナノ解析と数理モデル化による腐食促進試験法の設計フォーラム座長

2011/06 - 2013/02
(社)日本鉄鋼協会　大気腐食反応にともなう水素発生・侵入の検出と界面反応機構の解明フォーラム幹事

2011/06 - 2013/02
(社)日本鉄鋼協会　環境・エネルギー・社会工学部会運営委員

2010/03 - 2013/02
(社)日本鉄鋼協会　グリーンマテリアルフォーラム座長

2010/03 - 2013/02
(社)腐食防食協会　評議員

2012/02 - 2012/09
(社)日本鉄鋼協会　評議員

2010/04 - 2012/03
(社)腐食防食協会　評議員

2010/02 - 2012/02
(社)腐食防食協会固体高分子形燃料電池材料の腐食劣化分科会　委員

2007/04 - 2011/09
(社)日本鉄鋼協会　鉄鋼材料の腐食促進試験法設計－腐食起点および界面のミクロ・ナノ解析に基づいた数理モデル化－自主フォーラム座長

2010/11 - 2011/05
(社)日本鉄鋼協会　腐食による水素発生・吸収機構解析自主フォーラム幹事

2010/03 - 2011/05
経済産業省産学連携人材育成事業「産学人材育成パートナーシップ"鉄鋼分野における産学人材育成パートナーシッププロジェクト"」　委員

2008/11 - 2011/03
(社)日本工学教育協会 2010年度年次大会実行委員会　委員

2010/03 - 2010/09
(社)腐食防食協会会誌「Zairyo-to-Kankyo」編集委員会　委員

2007/04 - 2009/03
(社)腐食防食協会コロージョン・セミナー企画委員会　委員

2006/02 - 2009/03
(社)日本鉄鋼協会建材用塗装鋼板の端面防錆機構解明および寿命予測研究会　委員

2005/04 - 2009/03
「平成19年度鉄鋼業等材料産業における人材育成にかかわる産学連携のあり方に関する調査事業」に係わる「鉄鋼WG」　委員

2007/10 - 2008/03
(社)腐食防食協会　評議員

2006/04 - 2008/03
(社)日本鋼構造協会土木構造物へのステンレス鋼活用検討小委員会　委員

2005/10 - 2008/03
(社)腐食防食協会中国・四国支部幹事会　幹事

2005/01 - 2005/03
(社)ステンレス構造建築協会薄板構造研究・耐久性試験幹事会　委員

2004/04 - 2005/03
(社)腐食防食協会ステンレス鋼分科会　委員

2003/11 - 2005/03
(社)ステンレス構造建築協会性能研究委員会ステンレスボルト耐久性調査WG　委員

2000/04 - 2001/03
(社)ステンレス構造建築協会ステンレス中ボルトSCC対策会議　委員

1999/11 - 2000/03
(社)腐食防食協会高窒素ステンレス鋼の耐食性と材料科学分科会　委員

1996/04 - 1998/03
(社)日本鉄鋼協会ステンレス鋼の耐候性試験フォーラム　幹事

1996/04 - 1998/03
ステンレス協会技術委員会腐食専門委員会　幹事

1995/09 - 1998/02
鉄鋼規格国際整合推進委員会ステンレス規格原案作成委員会腐食試験方法分科会　幹事

1996/04 - 1997/03
(財)日本ウエザリングテストセンター大気の腐食性を決定するための大気暴露試験委員会　委員

1995/04 - 1997/03
(社)電気化学協会溶融塩委員会　委員

1992/04 - 1997/03
ステンレス協会技術委員会腐食専門委員会　委員

1993/04 - 1995/08
(社)日本鉄鋼協会ステンレス鋼の耐候性研究部会　幹事

1993/06 - 1994/03
(社)腐食防食協会溶融塩腐食研究会　委員

1992/04 - 1994/03

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Professional Memberships 7

The Electrochemical Society of Japan
The Surface Finishing Society of Japan
The Japan Institute of Metals
NACE International
The Iron and Steel Institute of Japan
Japan Society of Corrosion Engineering
The Electrochemical Society

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Research Interests 7

Light metals (Al alloys, Mg alloys, Ti and Ti alloys)
Steels, stainless steels
Electrochemical measurements
Corrosion resistance
Electrochemical Surface Processing
Chemical Conversion Coating
Corrosion Science and Engineering

Research Areas 2

Nanotechnology/Materials / Structural and functional materials /
Nanotechnology/Materials / Material fabrication and microstructure control /

Awards 9

Materia Japan Award

2022/09　The Japan Institute of Metals and Materials　Electrochemical Properties of Microstructures of Carbon Steels and Metallurgical Approaches for Improving Corrosion Resistance
Go Okamoto Memorial Lecture Award

2021/05　Japan Society of Corrosion Engineering　Elucidation of Local Corrosion Mechanisms of Metals and Micro-electrochemical Approaches to Improve Corrosion Resistance
Scientific Achievement Contribution Prize(Satomi Prize)

2017/03/15　一般社団法人日本鉄鋼協会　鉄鋼材料の局部腐食の研究
日本金属学会技術開発賞

2014/09/24　公益社団法人日本金属学会　ステンレス鋼の電解砥粒減面技術の開発
技術賞受賞耐食材料及び表面処理材料の大気腐食促進試験法の開発と国際規格化

2014/05/18　公益社団法人腐食防食学会
西山記念賞鉄鋼材料の局部腐食の研究

2014/03/22　一般社団法人日本鉄鋼協会
Best Paper Award

2010/05　Japan Society of Corrosion Engineering　Electrochemical Properties of Carbon Steel and Low Alloy Steels in Simulated Geological Disposal Environment
(社)日本金属学会技術開発賞

2004/09/28　日本金属学会　大気環境中における変色機構解明に基づく耐変色性に優れた建材用チタン板の開発
(社)腐食防食協会進歩賞

1997/05/07　腐食防食協会　建材用ステンレス鋼の発銹過程解析手法の確立

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Papers 186

Formation of corrosion-resistant coatings on cast AZ91D magnesium alloy using pulse electrolysis and the importance of coating morphology Peer-reviewed

Zheng Shao, Masashi Nishimoto, Izumi Muto

Surface and Coatings Technology　513　132473-132473　2025/07
Publisher: Elsevier B.V.
DOI： 10.1016/j.surfcoat.2025.132473 　
Microelectrochemical identification of the submicron-sized initiation site for pitting corrosion in 17–4PH stainless steel International-journal Peer-reviewed

Kota Ujihara, Masashi Nishimoto, Izumi Muto

Corrosion Science　251　112939　2025/07

DOI： 10.1016/j.corsci.2025.112939 　
In situ ICP-MS analysis of passivation process and selective dissolution of Fe-15Cr alloy in sulfuric acid International-journal International-coauthorship Peer-reviewed

Masashi Nishimoto, Jan Philipp Kollender, Izumi Muto, Achim Walter Hassel

Corrosion Science　249　112846-112846　2025/06
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2025.112846 　

ISSN： 0010-938X
In situ microscopy and electrochemical characteristics of initiation of intergranular corrosion of aging-treated Al–1Mg–0.65Si–0.8Cu alloy in 0.1 M NaCl International-journal Peer-reviewed

Mutsuki Inagaki, Masashi Nishimoto, Mai Takaya, Izumi Muto

Corrosion Science　112985-112985　2025/04
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2025.112985 　

ISSN： 0010-938X
Electrochemical aspects of the roles of Na2MoO4 conversion treatment: Galvanic corrosion inhibition of AA5083 coupled to AISI 1045 carbon steel International-journal Peer-reviewed

Takumi Kosaba, Izumi Muto, Masashi Nishimoto, Yu Sugawara

Corrosion Communications　2025/03
Publisher: Elsevier BV
DOI： 10.1016/j.corcom.2024.06.003 　

ISSN： 2667-2669
Fabrication of Mo-encapsulated stainless steel by powder metallurgy and assessment of localized corrosion resistance Peer-reviewed

Haruka Saito, Masashi Nishimoto, Izumi Muto

Journal of Materials Research and Technology　33　6340-6349　2024/11

DOI： 10.1016/j.jmrt.2024.11.027 　
Clarifying the Relationship Between Chemical States of P in Fe–P Alloys and Pitting Corrosion Resistance International-journal Peer-reviewed

Riku Takayama, Masashi Nishimoto, Haruka Sato, Izumi Muto

Journal of The Electrochemical Society　171　(10)　101502-101502　2024/10/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ad8269 　

ISSN： 0013-4651

eISSN： 1945-7111

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Fe–0.002 P, Fe–0.05 P, Fe–0.2 P, and Fe–2 P alloys (numbers indicate the mass%) were fabricated, and their pitting potentials, depassivation pH values, and active dissolution rates were measured. The order of pitting potentials was (high) Fe–0.002 P ≥ Fe–0.05 P ≥ Fe–0.2 P ≫ Fe–2 P (low), and that of depassivation pH values was (low) Fe–0.002 P ≤ Fe–0.05 P ≤ Fe–0.2 P ≪ Fe–2 P (high). Both parameters changed significantly between the Fe–0.2 P and Fe–2 P alloys. No evidence of grain boundary segregation of P was observed in the Fe–0.05 P alloy. In the Fe–0.2 P alloy, grain boundary segregation of P was observed, but no pitting occurred at the grain boundaries. In the Fe–2 P alloy, Fe₃P precipitated at the grain boundaries and in grains, but pitting corrosion occurred in the alloy matrix and not in Fe₃P. This indicated that P in the solid solution was the main cause of the decrease in pitting corrosion resistance. The P concentration in the surface oxide film on Fe–2 P was higher than that on Fe–0.2 P, and the P in the films was determined to be FePO₄. The decrease in the pitting resistance with an increasing P concentration was due to FePO₄.
Elucidation of the trigger for trenching around Al6(Fe, Mn) on AA5083 aluminum alloy in diluted synthetic seawater International-journal Peer-reviewed

Takumi Kosaba, Masashi Nishimoto, Izumi Muto

Corrosion Science　239　112362-112362　2024/10
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2024.112362 　

ISSN： 0010-938X
Effect of precipitated Mg-containing corrosion products on the anodic behavior of steel in aqueous corrosion for Zn-Al-Mg coated steel International-journal Peer-reviewed

Shimpei Tokuda, Yoshikatsu Nishida, Masashi Nishimoto, Izumi Muto, Takehiro Takahashi

Corrosion Science　112372-112372　2024/08
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2024.112372 　

ISSN： 0010-938X
Analysis of the electrochemical properties of high-entropy alloys and their application to the development of highly corrosion-resistant alloys Invited Peer-reviewed

Masashi Nishimoto, Izumi Muto

Journal of the Atomic Energy Society of Japan　66　(7)　351-355　2024/07
Publisher: Atomic Energy Society of Japan
DOI： 10.3327/jaesjb.66.7_351 　

ISSN： 1882-2606

eISSN： 2433-7285
Pitting corrosion characteristics of sintered Type 316 L stainless steel: relationship between pores and MnS International-journal Peer-reviewed

Haruka Saito, Masashi Nishimoto, Izumi Muto

npj Materials Degradation　8　(1)　61-61　2024/06/07
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41529-024-00482-6 　

eISSN： 2397-2106

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Abstract In Type 316 L stainless steel fabricated from gas-atomized powder via spark plasma sintering, lack-of-fusion pores and MnS inclusions were identified as possible pitting initiation sites. Through potentiodynamic polarization with different working electrode areas, the distribution density of the identified pit initiation sites was compared with that of sites found on wrought Type 316 L stainless steel. Surface observations of the sintered Type 316 L after polarization suggest that pitting corrosion was initiated at a location where both MnS and pores existed. By reducing the porosity and removing MnS, the roles of pores and MnS inclusions in the initiation of pitting corrosion were investigated.
Electrochemical properties of MnSe inclusions and improving the pitting corrosion resistance of stainless steel via Se microalloying International-journal Peer-reviewed

Masashi Nishimoto, Tomoki Katsuyama, Izumi Muto

Scientific Reports　14　(1)　7156-7156　2024/03/26
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-024-57995-y 　

eISSN： 2045-2322

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Abstract Controlling the electrochemical properties of non-metallic inclusions is of substantial interest in the design of corrosion-resistant alloys. To the best of our knowledge, the dissolution and pitting corrosion behavior of selenide inclusions in stainless steels and the improvement of the pitting corrosion resistance of type 304 stainless steels via Se microalloying have not been investigated. In this study, stainless steel specimens containing artificial MnS and MnSe inclusions were fabricated via spark plasma sintering to systematically investigate their electrochemical properties. The superior pitting corrosion resistance and dissolution resistance of MnSe to those of MnS were demonstrated. The results obtained from the sintered specimens were applied to improve the pitting corrosion resistance of type 304 stainless steels via Se microalloying. Adding a trace amount of Se (0.005 mass%) altered the readily soluble sulfide inclusions to dissolution-resistant selenide-type inclusions, resulting in improved pitting corrosion resistance of type 304 stainless steel.
Comparison of the Pitting Corrosion Resistance of Bainite and Martensite in Fe-0.4C-1.5Si-2Mn Steel Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara

ISIJ International　64　(2)　497-501　2024/01/30
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/isijinternational.isijint-2023-135 　

ISSN： 0915-1559

eISSN： 1347-5460
Role of MnS in the intergranular corrosion and depassivation of sensitized Type 304 stainless steel Peer-reviewed

Noriyuki Ida, Masashi Nishimoto, Izumi Muto, Yu Sugawara

npj Materials Degradation　8　(1)　2-2　2024/01/05
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41529-023-00419-5 　

eISSN： 2397-2106

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Abstract During polarization in 1 M NaCl (pH 5.4), intergranular corrosion of sensitized re-sulfurized Type 304 stainless steel occurred after pit initiation at MnS inclusions. Intergranular corrosion occurred when the pitting corrosion reached a Cr-depleted region along the sensitized grain boundaries. During depassivation under open-circuit conditions in 1 M NaCl (pH 1.0), MnS dissolution occurred as the first step, and the second step was the initiation of intergranular corrosion. Finally, dissolution of the steel matrix occurred. The role of MnS in the initiation of intergranular corrosion and depassivation of sensitized steel is discussed.
Initial dissolution of Mg-containing phase and corrosion product formation in cut-edge corrosion of Zn-11%Al-3%Mg-0.2%Si coated steel International-journal Peer-reviewed

Shimpei Tokuda, Yoshikatsu Nishida, Masashi Nishimoto, Izumi Muto, Hiromasa Shoji

Corrosion Science　225　111605-111605　2023/12
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2023.111605 　

ISSN： 0010-938X
Difference in the Precursory Process of the Intergranular Corrosion of Aged Al-Cu and Al-Cu-Mg Alloys in 0.1 M NaCl International-journal Peer-reviewed

Hiroki Yoshida, Masashi Nishimoto, Izumi Muto, Mai Takaya, Yoshihiko Kyo, Tadashi Minoda, Yu Sugawara

Journal of The Electrochemical Society　170　(11)　111501-111501　2023/10/24
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ad0666 　

ISSN： 0013-4651

eISSN： 1945-7111

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Abstract Real-time in situ optical microscopy observations of the initiation behavior of intergranular corrosion on artificially aged Al-4.5Cu and Al-4.5Cu-1.5Mg were performed in naturally aerated 0.1 M NaCl at pH 6.0. For both alloys, the discoloration of intermetallic particles occurred before intergranular corrosion, and a discolored coarse intermetallic particle on the grain boundary acted as the initiation site for intergranular corrosion (Al₂Cu for Al-4.5Cu and Al₂CuMg for Al-4.5Cu-1.4Mg). The discoloration of Al₂Cu particles was localized and occurred only on a small number of particles. However, almost all Al₂CuMg particles were discolored; the overall surface of the particles was discolored uniformly. The discoloration of Al₂Cu on Al-4.5Cu led to micropitting. In contrast, the discoloration of Al₂CuMg on Al-4.5Cu-1.5Mg caused the trenching of particles. The difference in the initiation behavior of intergranular corrosion was discussed in terms of these precursory phenomena.
Electrochemical Surface Modification of Al₈Co₁₉Cr₂₃Fe₃₂Ni₁₈ in H₂SO₄: A High-Entropy Alloy with High Pitting Corrosion Resistance and High Oxidation Resistance International-journal Peer-reviewed

Li Pao, Masashi Nishimoto, Izumi Muto, Yu Sugawara

MATERIALS TRANSACTIONS　64　(9)　2286-2295　2023/09
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2023088 　

ISSN： 1345-9678

eISSN： 1347-5320
Review―Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels International-journal Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara

Materials Transactions　64　(9)　2051-2058　2023/09
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.MT-C2023003 　

ISSN： 1345-9678

eISSN： 1347-5320
Enhancing pitting corrosion resistance of AA7075 through cathodic deposition of Mn-accumulated film on intermetallic particles containing copper Peer-reviewed

Ko Ebina, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Corrosion Science　220　111299-111299　2023/05
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2023.111299 　

ISSN： 0010-938X
Role of KMnO₄–NaF Treatment in Galvanic Corrosion Resistance of AA5083 Coupled to Steel International-journal Peer-reviewed

Takumi Kosaba, Izumi Muto, Masashi Nishimoto, Yu Sugawara

MATERIALS TRANSACTIONS　64　(4)　896-903　2023/04/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-l2022021 　

ISSN： 1345-9678

eISSN： 1347-5320
Role of Cu in corrosion resistance of CoCrCuFeNi medium-entropy alloys: Importance of compositional change and thickening of oxide films Peer-reviewed

Masaru Kato, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Corrosion Science　213　110982-110982　2023/04
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2023.110982 　

ISSN： 0010-938X
Micro-electrochemical insights into pit initiation site on aged UNS S32750 super duplex stainless steel International-journal Peer-reviewed

Shuichiro Amatsuka, Masashi Nishimoto, Izumi Muto, Makoto Kawamori, Yuya Takara, Yu Sugawara

npj Materials Degradation　7　(1)　15-15　2023/03/04
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41529-023-00335-8 　

eISSN： 2397-2106

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Abstract An aging treatment of UNS S32750 super duplex stainless steel at 1173 K for 1.0 ks produced σ and secondary austenite (γ₂) phases in the α and γ phase boundary regions. Small amount of Mn-Cr oxide and MnS complex inclusions were present in the steel. No pitting was observed during the potentiodynamic polarization of a small area (200 × 200 µm) without inclusions in 1 M MgCl₂ at 348 K. Because the electrode area included α, γ, σ, and γ₂ phases, these phases and their boundaries alone could not act as initiation sites for pitting. The electrode area size was gradually reduced from 3 × 3 mm to 1 × 1 mm, and pitting corrosion was observed to occur at the Mn-Cr oxide and MnS complex inclusions in a region that appeared to be the γ₂ phase near the σ phase.
Chemical Conversion Treatment of AA5083 Aluminum Alloy and AISI 1045 Carbon Steel under Galvanically Coupled Condition in Na₂MoO₄: Effect of pH on Corrosion Resistance International-journal Peer-reviewed

Takumi Kosaba, Izumi Muto, Masashi Nishimoto, Yu Sugawara

MATERIALS TRANSACTIONS　64　(2)　568-577　2023/02/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2022163 　

ISSN： 1345-9678

eISSN： 1347-5320
Change in Oxygen Reduction Reactivity of Intermetallics: A Mechanism of the Difference in Trenching Around Al–Fe and Al–Fe–Si Particles on AA1050 in NaCl International-journal International-coauthorship Peer-reviewed

Hiroshi Kakinuma, Izumi Muto, Yoshiyuki Oya, Takahiro Momii, Ying Jin, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　170　021503-021503　2023/01/27
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/acb6ba 　

ISSN： 0013-4651

eISSN： 1945-7111

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Abstract Trenching around intermetallic particles on AA1050 aluminum in 0.1 M NaCl at pH 6.0 was analyzed by in situ observations. Deep trenches, which become the initiation site for pitting, were formed around the Al–Fe–Si particles but not around the Al–Fe particles. The open-circuit potentials of the bulk intermetallic compounds and Al-matrix of AA1050 without intermetallic particles were measured. It was determined that the Al–Fe–Si and Al–Fe particles were cathodically polarized by the Al-matrix of AA1050 under natural immersion conditions. This cathodic polarization was found to change the oxygen reduction reactivity of the intermetallic particles. The cathodic reactivity on bulk Al–Fe was higher than that on bulk Al–Fe–Si under as-polished condition. However, after potentiostatic cathodic polarization, the cathodic reactivity on bulk Al–Fe decreased, whereas that on bulk Al–Fe–Si increased. Micro-electrochemical measurements and surface analyses clarified that the change in the cathodic reactivity of the intermetallic particles plays a critical role in trenching on AA1050 aluminum.
Fabrication of a model specimen for understanding micro-galvanic corrosion at the boundary of α-Mg and β-Mg₁₇Al₁₂ International-journal Peer-reviewed

Zheng Shao, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Journal of Magnesium and Alloys　11　(1)　137-153　2023/01
Publisher: Elsevier BV
DOI： 10.1016/j.jma.2022.10.020 　

ISSN： 2213-9567
Effect of quenching in aqueous polyvinylpyrrolidone solutions on the microstructure and pitting corrosion resistance of AISI 1045 carbon steel

Masashi Nishimoto, Izumi Muto, Takashi Doi, Kaori Kawano, Yu Sugawara

Materials and Corrosion　74　(5)　724-733　2022/12/21
Publisher: Wiley
DOI： 10.1002/maco.202213658 　

ISSN： 0947-5117

eISSN： 1521-4176
Understanding and Controlling the Electrochemical Properties of Sulfide Inclusions for Improving the Pitting Corrosion Resistance of Stainless Steels Invited Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara

Zairyo-to-Kankyo (Corrosion Engineering)　71　(12)　401-408　2022/12
Publisher:
DOI： 10.3323/jcorr.71.401 　
Micro-Electrochemical Aspects of the Effects of Temperature on Pit Initiation at MnS Inclusion in Type 304 Stainless Steel International-journal Peer-reviewed

Riku Takayama, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Journal of The Electrochemical Society　169　(11)　111501-111501　2022/11/04
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ac9d6c 　

ISSN： 0013-4651

eISSN： 1945-7111

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In 1 M NaCl, the pitting potentials of resulfurized Type 304 stainless steel decreased as the temperature increased from 25 °C to 75 °C. The dissolution potential of MnS in 0.1 M Na₂SO₄ also decreased with increase in temperature. As the macroscale pitting potentials at all temperatures ranged within the dissolution potential range of MnS, the decrease in MnS dissolution potential was critical in determining the decrease in pitting potentials at high temperatures. However, in 1 M NaCl, the microscale pitting potentials exceeded those of the macroscale pitting: pits were generated at the boundaries of the MnS and steel matrix at 25 and 50 °C, but at 75 °C, pitting occurred in a deeper portion of the MnS inclusion. The formation of an occluded geometry is essential for pitting; however, because the dissolution rate and potential of MnS vary with temperature, the shape and location of the occluded geometry at inclusions as well are expected to vary with temperature. The depassivation pH of Type 304 stainless steel in 1 M NaCl–10 mM Na₂S₂O₃ increased from 2 to approximately 3 at temperatures from 25 °C to 75 °C. The dissolved MnS species appeared to significantly influence the decrease in pitting potential.
Sudden pH and Cl⁻ Concentration Changes during the Crevice Corrosion of Type 430 Stainless Steel Peer-reviewed

Kengo Matsumura, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Journal of The Electrochemical Society　169　(10)　101506-101506　2022/10/28
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ac9bda 　

ISSN： 0013-4651

eISSN： 1945-7111

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To determine whether large sudden pH and Cl^⁻ concentration changes occur during the crevice corrosion of Fe-16Cr, as in the case of Fe-18Cr-10Ni-5.4Mn, simultaneous measurement of the pH and Cl^⁻ concentration was performed in 0.01 M NaCl (pH 3.0). The corrosivity of the crevice solution was different before and after crevice corrosion initiation, and the sudden changes in the pH and Cl^⁻ concentration inside the crevice were the same as those for Fe-18Cr-10Ni-5.4Mn. The incubation period was characterized by weak acidification (pH 1.6−2.0) and a small accumulation of Cl^⁻ (0.1−0.3 M). The growth period was characterized by strong acidification (pH ≤ 1.0) and a large accumulation of Cl^⁻ (≥1.0 M). At the crevice corrosion initiation site, a metastable pit was observed and a S signal was detected from the residual in the pit. It can be concluded that the crevice corrosion of Type 430 stainless steels is initiated by Cl^⁻, which generates metastable pitting at sulfide inclusions. The effect of the electrode potential on the pH and Cl^⁻ concentration was investigated in 0.01 M NaCl from −0.05 to 0.1 V. No effect of potential was observed during both the crevice corrosion incubation and growth periods.
Change in the corrosion resistance of martensitic steels with interstitial C content and improvement of ductility and corrosion resistance by short-time tempering Invited Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

NETSUSHORI　62　(4)　163-169　2022/08
Corrosion-resistant sintered stainless steels with non-equilibrium Mo-rich phases Peer-reviewed

Haruka Saito, Izumi Muto, Masashi Nishimoto, Yu Sugawara

Materials Today Communications　33　104211-104211　2022/08
Publisher: Elsevier BV
DOI： 10.1016/j.mtcomm.2022.104211 　

ISSN： 2352-4928
Beneficial role of retained austenite in pitting corrosion resistance of Fe-C-Si-Mn steel in chloride environments International-journal Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　200　110251-110251　2022/05
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2022.110251 　

ISSN： 0010-938X
Role of CaS Inclusions in Pitting Initiation of Carbon Steel: Triggering Steel Depassivation International-journal Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara

ISIJ International　62　(4)　750-757　2022/04/15
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/isijinternational.isijint-2021-567 　

ISSN： 0915-1559

eISSN： 1347-5460
High-Temperature Heat-Treatment at 1673 K: Improvement of Pitting Corrosion Resistance at Inclusions of Type 304 Stainless Steel under Applied Stress Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

MATERIALS TRANSACTIONS　63　(2)　265-268　2022/02/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2021232 　

ISSN： 1345-9678

eISSN： 1347-5320
Galvanic Corrosion of AA5083/Fe in Diluted Synthetic Seawater: Effect of Anodizing on Local Electrochemistry on and around Al_₆(Fe,Mn) on Al-Matrix International-journal Peer-reviewed

Takumi Kosaba, Izumi Muto, Yu Sugawara

Journal of the Electrochemical Society　169　(2)　020550-020550　2022/02/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ac5301 　

ISSN： 0013-4651

eISSN： 1945-7111
Electrochemical Properties of Microstructures of Carbon Steels and Metallurgical Approaches for Improving Corrosion Resistance Invited Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Materia Japan　60　(12)　784-792　2021/12
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.60.784 　

ISSN： 1340-2625

eISSN： 1884-5843
Micro-electrochemical Properties and Pitting Corrosion Resistance of Microstructures of Carbon Steels Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Tetsu-to-Hagané　107　(12)　1085-1094　2021/12
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/tetsutohagane.tetsu-2021-032 　

ISSN： 0021-1575

eISSN： 1883-2954
Role of CaS Inclusions in Pitting Initiation of Carbon Steel: Triggering Steel Depassivation Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara

Tetsu-to-Hagané　107　(12)　1020-1028　2021/12
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/tetsutohagane.tetsu-2021-009 　

ISSN： 0021-1575

eISSN： 1883-2954
First-Principles Investigation on Work Function of Martensitic Carbon Steels: Effect of Interstitial Carbon on Anodic Dissolution Resistance Peer-reviewed

Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Takashi Doi, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　168　(11)　111503-111503　2021/11/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ac3276 　

ISSN： 0013-4651

eISSN： 1945-7111

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The effect of interstitial carbon on the work function and the dissolution resistance of martensitic carbon steels was investigated. Ultraviolet photoelectron spectroscopy measurements of 0.001%C, 0.44%C, and 0.88%C specimens showed that the work function of steels increased with the amount of interstitial carbon. In addition, first-principles calculations indicated that the presence of interstitial carbon clearly increased the work function on both the (110) and (100) orientation surfaces. The immersion tests and potentiodynamic polarization measurements of the specimens were conducted in 50 mM C_₈H_₅KO_₄ at pH 4.0, and it was clarified that the anodic dissolution reaction was suppressed as the amount of interstitial carbon increased. The improvement in work function appeared to be related to the superior anodic dissolution resistance.
Roles of Alloying Elements in the Corrosion Resistance of Equiatomic CoCrFeMnNi High-Entropy Alloy and Application to Corrosion-Resistant Alloy Design Peer-reviewed

Takumi Aiso, Masashi Nishimoto, Izumi Muto, Yu Sugawara

MATERIALS TRANSACTIONS　62　(11)　1677-1680　2021/11
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2021136 　

ISSN： 1345-9678

eISSN： 1347-5320
Real-time in situ observation of the corrosion process of die-cast AZ91D magnesium alloy in NaCl solutions under galvanostatic polarization Peer-reviewed

Zheng Shao, Masashi Nishimoto, Izumi Muto, Yu Sugawara

Corrosion Science　192　109834-109834　2021/11
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2021.109834 　

ISSN： 0010-938X
Pitting at inclusions of the equiatomic CoCrFeMnNi alloy and improving corrosion resistance by potentiodynamic polarization in H₂SO₄ Peer-reviewed

Li Pao, Izumi Muto, Yu Sugawara

Corrosion Science　191　109748-109748　2021/10
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2021.109748 　

ISSN： 0010-938X
Effect of Sensitization on Pitting Corrosion at MnS and CrS in Type 304 Stainless Steel Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　168　(9)　091504-091504　2021/09/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ac28c6 　

ISSN： 0013-4651

eISSN： 1945-7111
Visualizing the Crevice Corrosion Behavior of Nitrogen-Containing Stainless Steel: Changes in pH and Cl- Distributions with Initiation, Growth, and Local Repassivation Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Zairyo-to-Kankyo (Corrosion Engineering)　70　(8)　250-256　2021/08

DOI： 10.3323/jcorr.70.250 　
Improving the Pitting Corrosion Resistance of AA1050 Aluminum by Removing Intermetallic Particles during Conversion Treatments International-journal Peer-reviewed

Hiroshi Kakinuma, Izumi Muto, Yoshiyuki Oya, Takahiro Momii, Yu Sugawara, Nobuyoshi Hara

MATERIALS TRANSACTIONS　62　(8)　1160-1167　2021/08/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2021071 　

ISSN： 1345-9678

eISSN： 1347-5320
The role of applied stress in the anodic dissolution of sulfide inclusions and pit initiation of stainless steels Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　183　109312-109312　2021/05
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2021.109312 　

ISSN： 0010-938X
Cerium addition to CaS inclusions in stainless steel: Insolubilizing water-soluble inclusions and improving pitting corrosion resistance International-journal Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　180　109222-109222　2021/03
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2020.109222 　

ISSN： 0010-938X
Morphological Change and Open-circuit Potential of Single Metastable Pit on AA1050 Aluminum in NaCl Solution International-journal Peer-reviewed

Hiroshi Kakinuma, Izumi Muto, Yoshiyuki Oya, Takahiro Momii, Yu Sugawara, Nobuyoshi Hara

Journal of the Electrochemical Society　168　(2)　021504-021504　2021/02/01
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/abdee9 　

ISSN： 0013-4651

eISSN： 1945-7111
Effect of Anodizing on Galvanic Corrosion Resistance of Al Coupled to Fe or Type 430 Stainless Steel in Diluted Synthetic Seawater International-journal Peer-reviewed

Takumi Kosaba, Izumi Muto, Yu Sugawara

Corrosion Science　179　109145-109145　2021/02
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2020.109145 　

ISSN： 0010-938X
Effect of Impurity Elements on Localized Corrosion of Zirconium in Chloride Containing Environment Peer-reviewed

Yusuke Tsutsumi, Izumi Muto, Shigeyuki Nakano, Junichi Tsukada, Tomoyo Manaka, Peng Chen, Maki Ashida, Yu Sugawara, Masayuki Shimojo, Nobuyoshi Hara, Hideki Katayama, Takao Hanawa

Journal of The Electrochemical Society　167　(14)　141507-141507　2020/11/06

DOI： 10.1149/1945-7111/abc5d8 　

ISSN： 0013-4651

eISSN： 1945-7111
Passivity of (Mn,Cr)S inclusions in type 304 stainless steel: The role of Cr and the critical concentration for preventing inclusion dissolution in NaCl solution Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　176　109060-109060　2020/11
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2020.109060 　

ISSN： 0010-938X
A Corrosion Resistant Sintered Stainless Steel: Type 304L Containing Mo-Rich Phases

Haruka Saito, Izumi Muto, Yu Sugawara

MATERIALS TRANSACTIONS　61　(11)　2248-2251　2020/11/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2020228 　

ISSN： 1345-9678

eISSN： 1347-5320
Studies on localized corrosion at intermetallic particles on Al alloys Invited Peer-reviewed

Hiroshi KAKINUMA, Izumi MUTO, Yu SUGAWARA, Nobuyoshi HARA

KEIKINZOKU (Journal of Japan Institute of Light Metals)　70　(7)　314-315　2020/07
High-Temperature Annealing of Ferrite Stainless Steel: Modification of Sulfide Inclusion Properties and Inhibition of Inclusion Dissolution Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Zairyo-to-Kankyo　69　(7)　194-198　2020/07
Publisher: Japan Society of Corrosion Engineering
DOI： 10.3323/jcorr.69.194 　

ISSN： 0917-0480

eISSN： 1881-9664
Pit initiation on sensitized Type 304 stainless steel under applied stress: Correlation of stress, Cr-depletion, and inclusion dissolution Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　167　108506-108506　2020/05
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2020.108506 　

ISSN： 0010-938X
Roles of Interstitial Nitrogen, Carbon, and Boron in Steel Corrosion: Generation of Oxyanions and Stabilization of Electronic Structure Peer-reviewed

Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Gerald S. Frankel, Takashi Doi, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　167　(8)　081503-081503　2020/04/23
Publisher: The Electrochemical Society
DOI： 10.1149/1945-7111/ab8926 　

eISSN： 1945-7111
First-principles analysis of the inhibitive effect of interstitial carbon on an active dissolution of martensitic steel Peer-reviewed

Mariko Kadowaki, Arkapol Saengdeejing, Izumi Muto, Ying Chen, Hiroyuki Masuda, Hideki Katayama, Takashi Doi, Kaori Kawano, Hideo Miura, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　163　108251-108251　2020/02
Publisher: Elsevier BV
DOI： 10.1016/j.corsci.2019.108251 　

ISSN： 0010-938X
Artificial MnS Inclusions in Stainless Steel: Fabrication by Spark Plasma Sintering and Corrosion Evaluation by Microelectrochemical Measurements Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ISIJ International　60　(1)　196-198　2020/01

DOI： 10.2355/isijinternational.ISIJINT-2019-408 　
Anodic Polarization Characteristics and Electrochemical Properties of Fe₃C in Chloride Solutions Peer-reviewed

Mariko Kadowaki, Izumi Muto, Kinari Takahashi, Takashi Doi, Hiroyuki Masuda, Hideki Katayama, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　166　(12)　C345-C351　2019/09

DOI： 10.1149/2.1311912jes 　
Mechanism of Corrosion Protection at Cut Edge of Zn-11%Al-3%Mg-0.2%Si Coated Steel Sheets Peer-reviewed

MUTO Izumi

Yuki Suzuki, Shinichi Yamaguchi, Masamitsu Matsumoto and Izumi Muto　105　(7)　752-758　2019/07

DOI： 10.2355/tetsutohagane.TETSU-2018-149 　
Effectiveness of an intercritical heat-treatment on localized corrosion resistance at the microstructural boundaries of medium-carbon steels Peer-reviewed

Mariko Kadowaki, Izumi Muto, Hideki Katayama, Hiroyuki Masuda, Yu Sugawara, Nobuyoshi Hara

Corrosion Science　154　159-177　2019/07

DOI： 10.1016/j.corsci.2019.04.019 　
NH₄⁺ Generation: The Role of NO₃⁻ in the Crevice Corrosion Repassivation of Type 316L Stainless Steel Peer-reviewed

Takahito Aoyama, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

Journal of The Electrochemical Society　166　(10)　C250-C260　2019/06

DOI： 10.1149/2.0501910jes 　
Morphological Characteristics of Trenching around MnS Inclusions in Type 316 Stainless Steel: The Role of Molybdenum in Pitting Corrosion Resistance Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　166　(11)　C3081-C3089　2019/04

DOI： 10.1149/2.0131911jes 　
Elucidating Electrochemical Properties at the Boundary between MnS and Steel Matrix: Towards the Improvement of Pitting Corrosion Resistance of Stainless Steels Peer-reviewed

Izumi Muto, Aya Chiba, Masayuki Tohjoh, Yu Sugawara, Nobuyoshi Hara

Tetsu-to-Hagané　105　(2)　207-214　2019/02

DOI： 10.2355/tetsutohagane.TETSU-2018-068 　
Mechanism for the Morphological Change from Trenching to Pitting around Intermetallic Particles in AA1050 Aluminum Peer-reviewed

Hiroshi Kakinuma, Izumi Muto, Yoshiyuki Oya, Yoshihiko Kyo, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　166　(2)　C19-C32　2019/01

DOI： 10.1149/2.0331902jes 　
Observations on Pit Initiation Behavior of Ferrite-Pearlite Structure using Microelectrochemical System with Confocal Laser Scanning Microscopy Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Zairyo-to-Kankyo　67　(12)　497-501　2018/12
Detection of Hydrogen Distribution in Pure Iron Using WO3 Thin Film Peer-reviewed

Yu Sugawara, Yuto Sakaizawa, Akihiro Shibata, Izumi Muto, Nobuyoshi Hara

ISIJ International　58　(10)　1860-1867　2018/10

DOI： 10.2355/isijinternational.ISIJINT-2018-236 　
III. Advanced Electrochemical Methods for Corrosion Study: Microscale Polarization Invited Peer-reviewed

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Zairyo-to-Kankyo　67　(8)　183-190　2018/05

DOI： 10.3323/jcorr.67.197 　
Formation of Pt-skin Layer on Ordered and Disordered Pt-Co Alloys and Corrosion Resistance in Sulfuric Acid Peer-reviewed

Yu Sugawara, Michiko Konno, Izumi Muto, Nobuyoshi Hara

Electrocatalysis　9　(5)　539-549　2018/05
Publisher: Springer Nature
DOI： 10.1007/s12678-017-0448-9 　

ISSN： 1868-2529
Understanding Corrosion Phenomena at Micro- and Nano-scales - 2 New Horizons in Corrosion Research on Carbon Steels Invited Peer-reviewed

Izumi Muto, Koji Fushimi, Hideki Katayama

Ferrum (Bulletin of The Iron and Steel Institute of Japan)　23　(1)　12-19　2018/01/01
Publisher:
ISSN： 1341-688X
Relationships between Pitting Corrosion Potentials and MnS Dissolution of 5–18 Mass% Cr Steels Peer-reviewed

Shinpei Asano, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　165　(11)　C732-C742　2018
Publisher: The Electrochemical Society
DOI： 10.1149/2.0271811jes 　
Improving Pitting Corrosion Resistance at Inclusions and Ductility of a Martensitic Medium-Carbon Steel: Effectiveness of Short-Time Tempering Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Takashi Doi, Kaori Kawano, Nobuyoshi Hara

Journal of The Electrochemical Society　165　(11)　C711-C721　2018
Publisher: The Electrochemical Society
DOI： 10.1149/2.0071811jes 　
A Methodology for Fabrication of Highly Pitting Corrosion-Resistant Type 304 Stainless Steel by Plasma Carburizing and Post-Pickling Treatment Peer-reviewed

Yu Sugawara, Waka Inoue, Izumi Muto, Nobuyoshi Hara

Journal of The Electrochemical Society　165　(9)　C441-C449　2018
Publisher: The Electrochemical Society
DOI： 10.1149/2.0081809jes 　
Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Michiyasu Takahashi, Masamitsu Matsumoto, Nobuyoshi Hara

CORROSION SCIENCE　129　(12)　126-135　2017/12

DOI： 10.1016/j.corsci.2017.07.020 　

ISSN： 0010-938X

eISSN： 1879-0496
REAL-TIME MICROELECTROCHEMICAL OBSERVATIONS OF INITIATION AND VERY EARLY STAGE OF CORROSION ON STEELS Invited Peer-reviewed

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Proceedings of 11th International Conference on Zinc and Zinc Alloy Coated Steel Sheet (GALVATECH2017)　141-147　2017/11/12
Micro-Electrochemical Properties of CeS Inclusions in Stainless Steel and Inhibiting Effects of Ce³⁺Ions on Pitting Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of The Electrochemical Society　164　(13)　C901-C910　2017/11/08

DOI： 10.1149/2.0051714jes 　

ISSN： 0013-4651

eISSN： 1945-7111
In situ monitoring of crevice corrosion morphology of Type 316L stainless steel and repassivation behavior induced by sulfate ions Peer-reviewed

Takahito Aoyama, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

CORROSION SCIENCE　127　(10)　131-140　2017/10

DOI： 10.1016/j.corsci.2017.08.005 　

ISSN： 0010-938X

eISSN： 1879-0496
Understanding Corrosion Phenomena at Micro- and Nano-scales - 1 Present Status and Future Prospects of Corrosion Research on Carbon Steels Invited Peer-reviewed

Izumi Muto, Koji Fushimi, Hideki Katayama

Ferrum (Bulletin of The Iron and Steel Institute of Japan)　22　(11)　592-602　2017/10/01
Publisher:
ISSN： 1341-688X
Challenges and Prospects in Corrosion Science and Technology Invited Peer-reviewed

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Materia Japan　56　(3)　175-179　2017/03/01
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.56.175 　

ISSN： 1340-2625
Electrochemical Passivation for Sm₂Fe₁₇N₃ Magnetic Powders in Non-Aqueous Solvents International-journal Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Takashi Ishikawa, Yukinobu Yoneyama, Nobuyoshi Hara

ELECTROCHIMICA ACTA　224　(1)　386-396　2017/01

DOI： 10.1016/j.electacta.2016.12.084 　

ISSN： 0013-4686

eISSN： 1873-3859
Real-Time Microelectrochemical Observations of Very Early Stage Pitting on Ferrite-Pearlite Steel in Chloride Solutions Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Takashi Doi, Kaori Kawano, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　164　(6)　C261-C268　2017

DOI： 10.1149/2.0801706jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Local Electrochemistry and In Situ Microscopy of Pitting at Sensitized Grain Boundary of Type 304 Stainless Steel in NaCl Solution Peer-reviewed

Noriyuki Ida, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　164　(13)　C779-C787　2017

DOI： 10.1149/2.1011713jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Pitting corrosion resistance of martensite of AISI 1045 steel and the beneficial role of interstitial carbon Peer-reviewed

Mariko Kadowaki, Izumi Muto, Yu Sugawara, Takashi Doi, Kaori Kawano, Nobuyoshi Hara

Journal of the Electrochemical Society　164　(14)　C962-C972　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/2.0541714jes 　

ISSN： 1945-7111 0013-4651
Pitting at the δ/γ boundary of Type 304 stainless steel in NaCl solution: The role of oxide inclusions and segregation Peer-reviewed

Asako Otake, Izumi Muto, Aya Chiba, Yu Sugawara, Nobuyoshi Hara

Journal of the Electrochemical Society　164　(14)　C991-C1002　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/2.0561714jes 　

ISSN： 1945-7111 0013-4651
Effect of nitrate ions on repassivation behavior of crevice corrosion on type 316L stainless steel Peer-reviewed

Takahito Aoyama, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　80　(10)　519-526　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/08010.0519ecst 　

ISSN： 1938-5862 1938-6737
Role of Ni addition in corrosion behavior of model interface between rust layer and steel matrix on weathering steel Peer-reviewed

Yu Sugawara, Waka Inoue, Ayaka Yomogida, Izumi Muto, Shiro Tsuri, Nobuyoshi Hara

ECS Transactions　80　(10)　498-507　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/08010.0499ecst 　

ISSN： 1938-5862 1938-6737
Micro-electrochemical in situ observation of pit initiation at precipitates in AA5182 Al-Mg alloy in 0.1 M NaCl Peer-reviewed

Yuto Sakaizawa, Izumi Muto, Yu Sugawara, Yoshiyuki Oya, Yoshihiko Kyo, Nobuyoshi Hara

ECS Transactions　80　(10)　553-564　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/08010.0553ecst 　

ISSN： 1938-5862 1938-6737
Effect of applied stress on pitting corrosion behavior of type 304 stainless steel in chloride environment Peer-reviewed

Shimpei Tokuda, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　80　(10)　1407-1413　2017
Publisher: Electrochemical Society Inc.
DOI： 10.1149/08010.1407ecst 　

ISSN： 1938-5862 1938-6737
The Effect of Change in Solution Chemistry on Repassivation of Crevice Corrosion on Type 316L Stainless Steel Peer-reviewed

Takahito Aoyama, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)　140-141　2016/08/01
Detection of Hydrogen Permeating through Steel Using Electrochromic Tungsten Oxide Peer-reviewed

Yu Sugawara, Yuto Sakaizawa, Akihiro Shibata, Izumi Muto, Nobuyoshi Hara

The Ninth Pacific Rim International Conference on Advanced Materials and Processing (PRICM9)　544-546　2016/08/01
Effect of atmospheric aging on dissolution of MnS inclusions and pitting initiation process in type 304 stainless steel Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

CORROSION SCIENCE　106　(5)　25-34　2016/05

DOI： 10.1016/j.corsci.2016.01.022 　

ISSN： 0010-938X

eISSN： 1879-0496
Simultaneous visualization of pH and Cl^- distributions inside the crevice of stainless steel Peer-reviewed

Masashi Nishimoto, Junichiro Ogawa, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

CORROSION SCIENCE　106　(5)　298-302　2016/05

DOI： 10.1016/j.corsci.2016.01.028 　

ISSN： 0010-938X

eISSN： 1879-0496
A Microelectrochemical Approach to Understanding Hydrogen Absorption into Steel during Pitting Corrosion Peer-reviewed

Naoto Sato, Tateru Takahashi, Izumi Muto, Tomohiko Omura, Yu Sugawara, Nobuyoshi Hara

ISIJ INTERNATIONAL　56　(3)　495-497　2016

DOI： 10.2355/isijinternational.ISIJINT-2015-307 　

ISSN： 0915-1559

eISSN： 1347-5460
Effect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al-Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel Peer-reviewed

Yu Sugawara, Kohei Araake, Izumi Muto, Michiyasu Takahashi, Masamitsu Matsumoto, Nobuyoshi Hara

ISIJ INTERNATIONAL　56　(12)　2267-2275　2016

DOI： 10.2355/isijinternational.ISIJINT-2016-336 　

ISSN： 0915-1559

eISSN： 1347-5460
Effect of plasma carburizing treatment on pitting corrosion resistance of type 304 stainless steel Peer-reviewed

Waka Inoue, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　75　(52)　1-9　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07552.0001ecst 　

ISSN： 1938-5862 1938-6737
Microscopic polarization behavior of cerium sulfide inclusions in stainless steel Peer-reviewed

Masashi Nishimoto, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　75　(52)　27-34　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07552.0027ecst 　

ISSN： 1938-5862 1938-6737
Hydrogen entry into pure iron treated by plasma nitriding Peer-reviewed

Yu Sugawara, Izumi Muto, Nobuyoshi Hara

ECS Transactions　75　(29)　43-50　2016
Publisher: Electrochemical Society Inc.
DOI： 10.1149/07529.0043ecst 　

ISSN： 1938-5862 1938-6737
Corrosion Resistance of a Free-Cutting Soft-Magnetic Stainless Steel in Pure Water Peer-reviewed

Yu Sugawara, Tatsuya Naruse, Takashi Ebata, Izumi Muto, Nobuyoshi Hara

MATERIALS TRANSACTIONS　56　(11)　1814-1820　2015/11

DOI： 10.2320/matertrans.M2015222 　

ISSN： 1345-9678

eISSN： 1347-5320
Microelectrochemistry of Sulfide Inclusions and Pit Initiation Mechanisms of Stainless Steels Invited Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of the Surface Science Society of Japan　36　(1)　18-23　2015/01
Publisher: The Surface Science Society of Japan
DOI： 10.1380/jsssj.36.18 　

ISSN： 0388-5321

More details Close

Stainless steels suffer from pitting corrosion in chloride-containing environments. Sulfide inclusions, such as MnS, are known to act as the initiation sites of pitting. The pit initiation mechanism at MnS inclusions in chloride-containing environments is as follows: 1) dissolution of MnS inclusions leads to the deposition of elemental sulfur on and around the inclusions; 2) the coexistence of elemental sulfur and chloride ions results in the dissolution of the steel matrix, forming the trenches at the boundaries between the inclusions and the steel matrix, 3) rapid active dissolution occurs locally at the bottom of the trenches, because of the decrease of pH due to the hydrolysis reaction of Cr³⁺ and the electrode potential decrease at the bottom of the trench due to the solution resistance. Dissolution behavior of sulfide inclusions is of key importance in pit initiation process. Insoluble sulfide inclusions, such as CrS, TiS, and Ti₄C₂S₂, are unlikely to act as the pit initiation sites. Cr-or Ti-oxide films on the inclusions act as a barrier against inclusion dissolution. An applied stress causes micro-cracks on MnS inclusions, which promotes pit initiation of stainless steels. The micro-crack initiation is closely related to oxide film formation on MnS inclusions.
Microelectrochemical Aspects of Interstitial Carbon in Type 304 Stainless Steel: Improving Pitting Resistance at MnS Inclusion Peer-reviewed

Aya Chiba, Shuhei Shibukawa, Izumi Muto, Takashi Doi, Kaori Kawano, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　162　(6)　C270-C278　2015

DOI： 10.1149/2.0851506jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Electrochemical Roles of Anti-corrosive Pigments in Sacrificial Corrosion Protection of Painted Galvanized Steel and their Relation to Organic Coating Delamination Peer-reviewed

Takahito Aoyama, Izumi Muto, Takao Kanai, Kensei Yuasa, Yu Sugawara, Nobuyoshi Hara

ISIJ INTERNATIONAL　55　(11)　2443-2449　2015

DOI： 10.2355/isijinternational.ISIJINT-2015-249 　

ISSN： 0915-1559

eISSN： 1347-5460
Microelectrochemical investigation of pit initiation site on austenitic cast stainless steel Peer-reviewed

Asako Otake, Izumi Muto, Aya Chiba, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　69　(28)　1-11　2015
Publisher: Electrochemical Society Inc.
DOI： 10.1149/06928.0001ecst 　

ISSN： 1938-6737 1938-5862
Uniform Evolution of Nanoporosity on Amorphous Ti-Cu Alloys Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY　14　(10)　7879-7883　2014/10

DOI： 10.1166/jnn.2014.9444 　

ISSN： 1533-4880

eISSN： 1533-4899
Direct Observation of Pit Initiation Process on Type 304 Stainless Steel Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

MATERIALS TRANSACTIONS　55　(5)　857-860　2014/05

DOI： 10.2320/matertrans.M2014028 　

ISSN： 1345-9678

eISSN： 1347-5320
Microelectrochemical Study on the Surface Oxidation of Pt: The Effects of Crystal Orientation and Grain Boundary Peer-reviewed

Mayu Sasaki, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

MATERIALS TRANSACTIONS　55　(4)　735-738　2014/04

DOI： 10.2320/matertrans.M2013416 　

ISSN： 1345-9678

eISSN： 1347-5320
Dependency of the formation of Au-stabilized nanoporous copper on the dealloying temperature Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

MICROPOROUS AND MESOPOROUS MATERIALS　186　(1)　181-186　2014/03

DOI： 10.1016/j.micromeso.2013.12.003 　

ISSN： 1387-1811

eISSN： 1873-3093
Fabrication of nanoporous copper by dealloying of amorphous Ti-Cu-Ag alloys Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Akihiro Makino, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

JOURNAL OF ALLOYS AND COMPOUNDS　586　(1)　S134-S138　2014/02

DOI： 10.1016/j.jallcom.2013.01.087 　

ISSN： 0925-8388

eISSN： 1873-4669
Dissolution of Platinum Single Crystal Surfaces under Potential Cycling in Sulfuric Acid Solution Peer-reviewed

Yu Sugawara, Mayu Sasaki, Izumi Muto, Nobuyoshi Hara

POLYMER ELECTROLYTE FUEL CELLS 14　64　(3)　81-87　2014

DOI： 10.1149/06403.0081ecst 　

ISSN： 1938-5862
Effects of Corrosion and Cracking of Sulfide Inclusions on Pit Initiation in Stainless Steel Peer-reviewed

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　161　(10)　C494-C500　2014

DOI： 10.1149/2.0831410jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Dealloying behavior of amorphous binary Ti-Cu alloys in hydrofluoric acid solutions at various temperatures Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Shin-ichi Yamaura, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

JOURNAL OF ALLOYS AND COMPOUNDS　581　567-572　2013/12

DOI： 10.1016/j.jallcom.2013.07.144 　

ISSN： 0925-8388
Dealloying Behaviours of an Equiatomic TiCu Alloy Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

MATERIALS TRANSACTIONS　54　(7)　1120-1125　2013/07

DOI： 10.2320/matertrans.M2013033 　

ISSN： 1345-9678

eISSN： 1347-5320
Effects of the initial microstructure of Ti-Cu alloys on final nanoporous copper via dealloying Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

JOURNAL OF ALLOYS AND COMPOUNDS　557　166-171　2013/04

DOI： 10.1016/j.jallcom.2013.01.010 　

ISSN： 0925-8388
Nickel-stabilized nanoporous copper fabricated from ternary TiCuNi amorphous alloys Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Akihiro Makino, Nobuyoshi Hara

MATERIALS LETTERS　94　128-131　2013/03

DOI： 10.1016/j.matlet.2012.12.028 　

ISSN： 0167-577X
The role of oxide films on TiS and Ti4C2S2 inclusions in the pitting corrosion resistance of stainless steels Peer-reviewed

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Journal of the Electrochemical Society　160　(6)　C262-C269　2013

DOI： 10.1149/2.089306jes 　

ISSN： 0013-4651 1945-7111
Effects of deposited salts on corrosion behavior for 1100 aluminum alloy during constant dew point test Peer-reviewed

Takatoshi Shimada, Yoshiyuki Oya, Yukio Honkawa, Yoichi Kojima, Izumi Muto

Zairyo to Kankyo/ Corrosion Engineering　62　(2)　56-60　2013

DOI： 10.3323/jcorr.62.56 　

ISSN： 0917-0480 1881-9664
Elaboration of nanoporous copper by modifying surface diffusivity by the minor addition of gold Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

MICROPOROUS AND MESOPOROUS MATERIALS　165　257-264　2013/01

DOI： 10.1016/j.micromeso.2012.08.026 　

ISSN： 1387-1811
Nanoporous Copper Dealloyed from A Nanocrystallized TiCu Alloy Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

ADVANCED MATERIALS SCIENCE AND TECHNOLOGY, (IFAMST-8)　750　72-+　2013

DOI： 10.4028/www.scientific.net/MSF.750.72 　

ISSN： 0255-5476
Nanoporous palladium fabricated from an amorphous Pd42.5Cu 30Ni7.5P20 precursor and its ethanol electro-oxidation performance Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Takeshi Wada, Shin-Ichi Yamaura, Guoqiang Xie, Yu Sugawara, Izumi Muto, Akihiro Makino, Nobuyoshi Harab

Electrochimica Acta　108　512-519　2013
Publisher: Elsevier Ltd
DOI： 10.1016/j.electacta.2013.07.047 　

ISSN： 0013-4686
Microelectrochemical Investigation of Pit Initiation and Selective Dissolution between MnS and Stainless Steel Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

HIGH RESOLUTION CHARACTERIZATION OF CORROSION PROCESSES 3　50　(47)　15-23　2013

DOI： 10.1149/05047.0015ecst 　

ISSN： 1938-5862
Microscopic Polarization Behavior and Thermodynamic Stability of TiS and Ti4C2S2 Inclusions in Stainless Steels Peer-reviewed

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

HIGH RESOLUTION CHARACTERIZATION OF CORROSION PROCESSES 3　50　(47)　3-14　2013

DOI： 10.1149/05047.0003ecst 　

ISSN： 1938-5862
Effect of applied stress on dissolution morphology and pit initiation behavior of MnS inclusion in stainless steel Peer-reviewed

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ECS Transactions　58　(31)　13-22　2013
Publisher: Electrochemical Society Inc.
DOI： 10.1149/05831.0013ecst 　

ISSN： 1938-6737 1938-5862
Corrosion resistance of oxide scales formed in high-temperature oxidation of Al-bearing ferritic stainless steel Peer-reviewed

Yu Sugawara, Misako Ogiwara, Izumi Muto, Toru Inakuma, Hiroaki Sakamoto, Nobuyoshi Hara

ECS Transactions　58　(41)　65-74　2013
Publisher: Electrochemical Society Inc.
DOI： 10.1149/05841.0065ecst 　

ISSN： 1938-6737 1938-5862
Pit Initiation Mechanism at MnS Inclusions in Stainless Steel: Synergistic Effect of Elemental Sulfur and Chloride Ions Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　160　(10)　C511-C520　2013

DOI： 10.1149/2.081310jes 　

ISSN： 0013-4651

eISSN： 1945-7111
Bimodal nanoporous nickel prepared by dealloying Ni38Mn62 alloys Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

INTERMETALLICS　31　157-164　2012/12

DOI： 10.1016/j.intermet.2012.06.018 　

ISSN： 0966-9795
Fabrication of Ultrafine Nanoporous Copper by the Minor Addition of Gold Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

MATERIALS TRANSACTIONS　53　(10)　1765-1769　2012/10

DOI： 10.2320/matertrans.MAW201204 　

ISSN： 1345-9678

eISSN： 1347-5320
Fabrication of nanoporous copper by dealloying amorphous binary Ti-Cu alloys in hydrofluoric acid solutions Peer-reviewed

Zhenhua Dan, Fengxiang Qin, Yu Sugawara, Izumi Muto, Nobuyoshi Hara

INTERMETALLICS　29　14-20　2012/10

DOI： 10.1016/j.intermet.2012.04.016 　

ISSN： 0966-9795
入門講座鋼の防錆防食技術-4 孔食、介在物による腐食 Peer-reviewed

武藤泉, 千葉亜耶, 菅原優, 原信義

ふぇらむ　17　(7)　487-492　2012/07
Publisher: 日本鉄鋼協会
ISSN： 1341-688X
Effects of environmental factors on atmospheric corrosion of aluminium and its alloys under constant dew point conditions Peer-reviewed

Zhenhua Dan, Izumi Muto, Nobuyoshi Hara

CORROSION SCIENCE　57　(1)　22-29　2012/04

DOI： 10.1016/j.corsci.2011.12.038 　

ISSN： 0010-938X

eISSN： 1879-0496
Weathering of light metals in the atmosphere Peer-reviewed

Zhenhua Dan, Izumi Muto, Nobuyoshi Hara

Applied Mechanics and Materials　148-149　380-383　2012

DOI： 10.4028/www.scientific.net/AMM.148-149.380 　

ISSN： 1660-9336 1662-7482
Visualization of Solution Chemistry inside Crevice by pH and pCl Sensing Plates Peer-reviewed

Takefumi Kaji, Toshiya Sekiai, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

CRITICAL FACTORS IN LOCALIZED CORROSION 7　41　(25)　205-216　2012

DOI： 10.1149/1.3697590 　

ISSN： 1938-5862
Development of a New Microelectrochemical Measurement System for In-situ Optical Microscopic Observation of Pit Initiation Processes Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

CRITICAL FACTORS IN LOCALIZED CORROSION 7　41　(25)　237-245　2012

DOI： 10.1149/1.3697593 　

ISSN： 1938-5862
Effects of Environmental Parameters on Marine Corrosion of Aluminium Alloys Peer-reviewed

Zhenhua Dan, Izumi Muto, Nobuyoshi Hara

ADVANCED MATERIALS DESIGN AND MECHANICS　569　95-98　2012

DOI： 10.4028/www.scientific.net/AMR.569.95 　

ISSN： 1022-6680
鋼/介在物ヘテロ界面のマイクロ電気化学特性の解明と高耐食化への挑戦 Peer-reviewed

武藤泉, 千葉亜耶, 東城雅之, 菅原優, 原信義

ふぇらむ　17　(12)　858-863　2012
Publisher:
ISSN： 1341-688X
Improvement of pitting corrosion resistance of type 316L stainless steel by potentiostatic removal of surface MnS inclusions Peer-reviewed

Nobuyoshi Hara, Koichi Hirabayashi, Yu Sugawara, Izumi Muto

International Journal of Corrosion　2012　482730　2012

DOI： 10.1155/2012/482730 　

ISSN： 1687-9325 1687-9333
Visualization of pH and pCl Distributions: Initiation and Propagation Criteria for Crevice Corrosion of Stainless Steel Peer-reviewed

Takefumi Kaji, Toshiya Sekiai, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　159　(7)　C289-C297　2012

DOI： 10.1149/2.019207jes 　

ISSN： 0013-4651
A Microelectrochemical System for In Situ High-Resolution Optical Microscopy: Morphological Characteristics of Pitting at MnS Inclusion in Stainless Steel Peer-reviewed

Aya Chiba, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　159　(8)　C341-C350　2012

DOI： 10.1149/2.054208jes 　

ISSN： 0013-4651
Microelectrochemical Approaches for Understanding Pit Initiation Mechanisms of Stainless Steels Invited Peer-reviewed

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Electrochemistry　79　(12)　954-958　2011/12
Publisher:
DOI： 10.5796/electrochemistry.79.954 　

ISSN： 1344-3542
Applicability of constant dew point corrosion tests for evaluating atmospheric corrosion of aluminium alloys Peer-reviewed

Zhenhua Dan, Shunsuke Takigawa, Izumi Muto, Nobuyoshi Hara

CORROSION SCIENCE　53　(5)　2006-2014　2011/05

DOI： 10.1016/j.corsci.2011.02.027 　

ISSN： 0010-938X
Microelectrochemical Investigation of Hydrogen Absorption and Dissolution Behavior of MnS Inclusions in Carbon Steel Peer-reviewed

Izumi Muto, Jun Shinozaki, Tomohiko Omura, Mitsuhiro Numata, Nobuyoshi Hara

HIGH RESOLUTION CHARACTERIZATION OF CORROSION PROCESSES 2　33　(35)　9-20　2011

DOI： 10.1149/1.3577749 　

ISSN： 1938-5862
Cut Edge Corrosion Inhibition by Chromate in Primer of Prepainted 55% Al-Zn Alloy Coated Steel Peer-reviewed

Aya Chiba, Izumi Muto, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　158　(3)　C42-C47　2011

DOI： 10.1149/1.3527984 　

ISSN： 0013-4651
Local Dissolution of MnS Inclusion and Microstructural Distribution of Absorbed Hydrogen in Carbon Steel Peer-reviewed

Jun Shinozaki, Izumi Muto, Tomohiko Omura, Mitsuhiro Numata, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　158　(9)　C302-C309　2011

DOI： 10.1149/1.3611405 　

ISSN： 0013-4651
Electrochemical Properties of Titanium in PEFC Bipolar Plate Environments Peer-reviewed

Yasutaka Soma, Izumi Muto, Nobuyoshi Hara

MATERIALS TRANSACTIONS　51　(5)　939-947　2010/05

DOI： 10.2320/matertrans.M2009402 　

ISSN： 1345-9678

eISSN： 1347-5320
The principal of Kelvin probe and its application to corrosion science Invited Peer-reviewed

Izumi Muto

Rust Prevention and Control Japan　54　(2)　59-64　2010/02
Publisher:
ISSN： 0520-6340
Hydrogen Gas Sensor Using Pt- and Pd-Added Anodic TiO2 Nanotube Films Peer-reviewed

Sungwook Joo, Izumi Muto, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　157　(6)　J221-J226　2010

DOI： 10.1149/1.3374643 　

ISSN： 0013-4651
Scanning Kelvin Probe Analysis of Cut Edge Corrosion on Prepainted Galvanized Steel with Chromate-containing Epoxy Primer Peer-reviewed

Izumi Muto, Kazufumi Sato, Nobuyoshi Hara

COATINGS FOR CORROSION PROTECTION　25　(29)　59-70　2010

DOI： 10.1149/1.3327225 　

ISSN： 1938-5862
Effects of Third Element Addition on Atmospheric Corrosion Resistance of Zinc-Aluminum Die-Cast Alloys Peer-reviewed

Jun Shinozaki, Izumi Muto, Hiroshi Ogawa, Nobuyoshi Hara

JOURNAL OF THE JAPAN INSTITUTE OF METALS　73　(7)　533-541　2009/07

DOI： 10.2320/jinstmet.73.533 　

ISSN： 0021-4876

eISSN： 1880-6880
A Combinatorial Screening Method for Corrosion Research Using Ion-Beam-Deposited Thin-Film Alloys and Microelectrochemical Measurements Peer-reviewed

Izumi Muto, Tetsuji Kaneko, Noboru Akao, Nobuyoshi Hara

MATERIALS TRANSACTIONS　50　(7)　1894-1897　2009/07

DOI： 10.2320/matertrans.M2009130 　

ISSN： 1345-9678

eISSN： 1347-5320
Corrosion propagation behavior of magnesium alloys under atmospheric condition Peer-reviewed

S. Takigawa, I. Muto, N. Hara

ECS Transactions　16　(43)　71-84　2009

DOI： 10.1149/1.3114950 　

ISSN： 1938-5862 1938-6737
Microelectrochemical investigation on pit initiation at sulfide and oxide inclusions in type 304 stainless steel Peer-reviewed

Izumi Muto, Daiki Ito, Nobuyoshi Hara

Journal of the Electrochemical Society　156　(2)　C55-C61　2009

DOI： 10.1149/1.3033498 　

ISSN： 0013-4651
Microelectrochemical Investigation of Anodic Polarization Behavior of CrS Inclusions in Stainless Steels Peer-reviewed

Izumi Muto, Shimpei Kurokawa, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　156　(11)　C395-C399　2009

DOI： 10.1149/1.3223997 　

ISSN： 0013-4651
Effect of alloying elements on atmospheric corrosion behavior of zinc die-casting alloys Peer-reviewed

Izumi Muto, Hidenori Yoshida, Hiroshi Ogawa, Nobuyoshi Hara

JOURNAL OF THE JAPAN INSTITUTE OF METALS　72　(5)　337-346　2008/05

DOI： 10.2320/jinstmet.72.337 　

ISSN： 0021-4876

eISSN： 1880-6880
Electrochemical properties of carbon steel and low alloy steels in simulated geological disposal environment Peer-reviewed

Takuya Hirotani, Mitsuru Koike, Izumi Muto, Nobuyoshi Hara, Katsuhisa Sugimoto

Zairyo to Kankyo/ Corrosion Engineering　57　(1)　37-45　2008/01

DOI： 10.3323/jcorr.57.37 　

ISSN： 0917-0480
In situ ellipsometric analysis of growth processes of anodic TiO2 nanotube films Peer-reviewed

Sungwook Joo, Izumi Muto, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　155　(4)　C154-C161　2008

DOI： 10.1149/1.2837859 　

ISSN： 0013-4651
Initiation and propagation of atmospheric corrosion on aluminum alloys under a cyclic wet-dry condition with a constant dew point Peer-reviewed

Zhenhua Dan, Shunsuke Takigawa, Izumi Muto, Nobuyoshi Hara

ECS Transactions　16　(48)　37-47　2008

DOI： 10.1149/1.3149567 　

ISSN： 1938-5862 1938-6737
Microelectrochemistry on CrS and MnS inclusions and its relation with pitting potentials of stainless steels Peer-reviewed

Izumi Muto, Shimpei Kurokawa, Nobuyoshi Hara

ECS Transactions　16　(52)　269-280　2008

DOI： 10.1149/1.3229975 　

ISSN： 1938-5862 1938-6737
Electrochemical properties and contact resistance of titanium in PEFC bipolar plate environment Peer-reviewed

Yasutaka Soma, Izumi Muto, Nobuyoshi Hara

ECS Transactions　16　(48)　23-35　2008

DOI： 10.1149/1.3149566 　

ISSN： 1938-5862 1938-6737
Microelectrochemical measurements of dissolution of MnS inclusions and morphological observation of metastable and stable pitting on stainless steel Peer-reviewed

Izumi Muto, Yuta Izumiyama, Nobuyoshi Hara

JOURNAL OF THE ELECTROCHEMICAL SOCIETY　154　(8)　C439-C444　2007

DOI： 10.1149/1.2745639 　

ISSN： 0013-4651
Estimation of corrosion durability of stainless steels by atmospheric exposure tests Invited

Izumi Muto

Stainless Steel Structure　11　(1)　18-20　2005/08/01
Development of type 430 stainless steel sheet with high surface quality Peer-reviewed

Junichi. Hamada, Izumi Muto, Satoshi Ogawa, Chikara Ito, Masanori Hiro, Junichi Kozuka, Yoshihito Yamada, Satoshi Hashimoto

Stainless Steel Word 2004　454-459　2004/10
Development of Architectural Titanium Sheets with Highly Resistant to Discoloration Based on Clarification of Discoloration Mechanism in Atmospheric Environments

KANEKO Michio, TAKAHASHI Kazuhiro, HAYASHI Teruhiko, TOKUNO Kiyonori, MUTO Izumi

Bulletin of the Japan Institute of Metals　43　(1)　61-63　2004/01/20
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.43.61 　

ISSN： 1340-2625
Improvement of discoloration resistance of vacuum annealed commercially pure titanium sheets in atmospheric environments Peer-reviewed

Kazuhiro Takahashi, Michio Kaneko, Teruhiko Hayashi, Izumi Muto, Junichi Tamenari, Kiyonori Tokuno

Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan　90　(5)　278-285　2004
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/tetsutohagane1955.90.5_278 　

ISSN： 0021-1575
Corrosion Environment of Indoor Swimming Pool Buildings and Stress Corrosion Cracking of Stainless Steels Peer-reviewed

Hirofumi Yokota, Izumi Muto, Tetsuya Shimizu

Bosei Kanri(Rust Prev.Control)　47　(12)　459-465　2003/12
Publisher:
ISSN： 0520-6340
Environmental and metallurgical factors affecting discoloration of titanium sheets in atmospheric environments Peer-reviewed

M Kaneko, K Takahashi, T Hayashi, Muto, I, K Tokuno, K Kimura

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN　89　(8)　833-840　2003/08

DOI： 10.2355/tetsutohagane1955.89.8_833 　

ISSN： 0021-1575

eISSN： 1883-2954
Environment of Indoor Swimming Pool Buildings and SCC Behavior of Stainless Steel Bolt Sets Invited

Izumi Muto, Tetsuya Shimizu, Hironobu Yokota

J. Japan Res. Inst. for Screw Threads & Fasteners　34　(1)　4-11　2003/01
Publisher:
ISSN： 0287-8313
An Approach to the Modeling of Atmospheric Corrosion Environments and Its Application to Corrosion Test for Stainless Steels

Izumi Muto

Proceedings of 15th International Corrosion Congress　No.034　2002/09/22
Recent advances in stainless steels used for architectural applications and frontier of atmospheric corrosion research Invited Peer-reviewed

I. Muto

Zairyo to Kankyo/ Corrosion Engineering　50　(5)　203-209　2001
Publisher: Japan Society of Corrosion Engineering
DOI： 10.3323/jcorr1991.50.203 　

ISSN： 0917-0480
Characterization of Atmospheric Corrosion Behavior on Stainless Steels and Modeling of Outdoor Environments Invited Peer-reviewed

Izumi Muto

Materia Jpn.(Bull.Jpn.Inst.Met.)　38　(10)　791-797　1999/10
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.38.791 　

ISSN： 1340-2625
Evaluation methods for rusting behavior of stainless steels in architectural applications Invited Peer-reviewed

Izumi Muto

Zairyo to Kankyo/ Corrosion Engineering　47　(6)　370-375　1998
Publisher: Japan Soc of Corrosion Engineering
DOI： 10.3323/jcorr1991.47.370 　

ISSN： 0917-0480
Modeling of atmospheric corrosion environments and its application to constant dew-point corrosion Peer-reviewed

Izumi Muto, Katsuhisa Sugimoto

Zairyo to Kankyo/ Corrosion Engineering　47　(8)　519-527　1998
Publisher: Japan Society of Corrosion Engineering
DOI： 10.3323/jcorr1991.47.519 　

ISSN： 0917-0480
Pitting Corrosion Behavior of Stainless Steels in Atmospheric Environments Peer-reviewed

Izumi Muto, Eiji Sato, Satoshi Ito, Hiroshi Kihira

Proceedings of International Symposium on Plant Aging and Life Predictions of Corrodible Structures　153-160　1997/05
Atmospheric Corrosion Behavior of Stainless Steels and Its Estimation Method

Izumi Muto, Eiji Sato, Satoshi Ito, Hiroshi Kihira

Proceedings of International Congress Stainless Steels ‘96　327-328　1996/06/03
Maintenance and Selection of Stainless Steels for Architectural Application Peer-reviewed

Hiroshi Kihira, Izumi Muto

Zairyo-to-Kankyo　45　(6)　377-383　1996/06
Publisher: Japan Society of Corrosion Engineering
DOI： 10.3323/jcorr1991.45.377 　

ISSN： 0917-0480
On aesthetic degradation of stainless steel Peer-reviewed

H Kihira, Muto, I

MATERIALS TRANSACTIONS JIM　37　(3)　367-372　1996/03

DOI： 10.2320/matertrans1989.37.367 　

ISSN： 0916-1821
Atmospheric Corrosion Behavior of Stainless Steels

Izumi Muto, Eiji Sato, Satoshi Ito, Hiroshi Kihira

Proceedings of the 9th Asian-Pacific Corrosion Control Conference　No.85　1995/11
Characterization of Rusting Process on Stainless Steels Peer-reviewed

Izumi Muto, Hiroshi Kihira

Zairyo-to-Kankyo　44　(8)　442-447　1995

DOI： 10.3323/jcorr1991.44.442 　

ISSN： 1881-9664 0917-0480
Kinetics of Pit Growth for Stainless Steels under the Water Droplet Containing Chloride Ion Peer-reviewed

Izumi Muto, Hiroshi Kihira

Zairyo-to-Kankyo　44　(9)　505-512　1995

DOI： 10.3323/jcorr1991.44.505 　

ISSN： 1881-9664 0917-0480
Relationship between human perception and breakdown of passivity Peer-reviewed

Muto, I, H Kihira

PASSIVATION OF METALS AND SEMICONDUCTORS　185-　1057-1063　1995

DOI： 10.4028/www.scientific.net/MSF.185-188.1057 　

ISSN： 0255-5476
Current status and problems of atmospheric corrosion tests for stainless steels Peer-reviewed

Izumi Muto, Hiroshi Kihira

Bosei Kanri(Rust Prev.Control)　38　(7)　232-237　1994/07
Application of Titanium to Construction and Civil Engineering

Yasuo Takahashi, Yutaka Tadokoro, Izumi Muto, Naoko Tagomori, Syun'ichi Hitoshi

Nippon Steel Technical Report　62　(62)　9-15　1994/07
Publisher: Nippon Steel Technical Report
Corrosion Resistance of Stainless Steels in Atmospheric Environments Invited Peer-reviewed

Izumi Muto

Bosei Kanri(Rust Prev.Control)　38　(6)　193-199　1994/06
New electrochemical method to evaluate the atmospheric corrosion resistance of stainless steels

Izumi Muto, Eiji Sato, Satoshi Ito

ASTM Special Technical Publication　(1194)　382-393　1994
Publisher: Publ by ASTM
DOI： 10.1520/stp24896s 　

ISSN： 0066-0558
Rust Staining Resistance of Stainless Steels in a Marine Environment and its Estimation Method Peer-reviewed

Izumi Muto, Eiji Sato, Satoshi Ito

Zairyo to Kankyo/ Corrosion Engineering　42　(4)　211-218　1993

DOI： 10.3323/jcorr1991.42.211 　

ISSN： 1881-9664 0917-0480
Pitting Corrosion Behavior of Stainless Steels in a Marine Environment and Its Estimation Method Peer-reviewed

Izumi Muto, Eiji Sato, Satoshi Ito

Zairyo-to-Kankyo　42　(11)　714-720　1993

DOI： 10.3323/jcorr1991.42.714 　

ISSN： 1881-9664 0917-0480
An Electrochemical method to evaluate atmospheric corrosion resistance of stainless steels Peer-reviewed

Izumi Muto, Eiji Sato, Satoshi Ito, Hideo Abo

Proceedings of International Conference on Stainless Steels `91　1　317-323　1991/06/10
Galvanic Corrosion of Carbon steel coupled with stainless steel - Weld Joint

Izumi Muto, Yasumi Shimura

Stainless and Architecture　85　(4)　39-42　1991/01/31
In situ analysis of passive films on alloy 600 by modulated UV-visible reflection spectroscopy Peer-reviewed

Izumi Muto, Nobuyoshi Hara, Katsuhisa Sugimoto

Boshoku gijutsu　37　(11)　664-671　1988

DOI： 10.3323/jcorr1974.37.11_664 　

ISSN： 0010-9355

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Misc. 13

Micro-scale Polarization Invited Peer-reviewed

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

Zairyo-to-Kankyo　67　(5)　197-203　2018/05
ステンレス鋼の電解砥粒減免技術の開発

日下部繁, 河西寿雄, 荒川基彦, 武藤泉, 原信義

まてりあ　53　(1)　23-25　2014/01
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.53.23 　

ISSN： 1340-2625
孔食，介在物による腐食

Izumi Muto, Aya Chiba, Yu Sugawara, Nobuyoshi Hara

ふぇらむ　17　(7)　31-36　2012/07
ECS 220th Meeting

MUTO Izumi

61　(1)　8-9　2012/01/15

ISSN： 0917-0480
ECS 216th Meeting

MUTO Izumi

59　(3)　68-69　2010/03/15

ISSN： 0917-0480
The Characteristic of Zinc-Alloy for Die Castings

OGAWA Hiroshi, HARA Nobuyoshi, MUTO Izumi

Journal of MMIJ　125　(4)　236-242　2009/05/25
Publisher: 資源・素材学会
ISSN： 1881-6118
Effects of Environmental Factors on Atmospheric Corrosion of Aluminum and Its Alloys

Z. H. Dan, I. Muto, N. Hara

Proceedings of the 56th Japan Conference on Material and Environments　305-308　2009
Propagation of atmospheric corrosion on aluminum alloy 6061 under a cyclic wet-dry condition

Z. H. Dan, I. Muto, N. Hara

Proceedings of JSCE Materials and Environments　369-370　2008
Ichinoseki National College of Technology, Department of Mechanical Engineering

MUTO Izumi

56　(11)　511-512　2007/11/15

ISSN： 0917-0480
An electrochemical study on initiation of atmospheric corrosion on aluminum alloy 6061 in a cyclic wet-dry condition

Z. H. Dan, I Muto, N. Hara

Proceedings of the 54th Japan Conference on Material and Environments　485-488　2007
Performance Upgrade against Environmental Degradation of Metals and Super Stainless Steels

Izumi Muto, Tooru Matsuhashi, Akihiko Takahashi

Expected Materials for the Future　5　(2)　34-40　2005/02/10
Publisher: NTS
ISSN： 1346-0986
Improvement of discoloration-resistance in commercially pure titanium sheet (Discoloration mechanism of titanium in atmospheric environments and development of preventive method-3)

TAKAHASHI Kazuhiro, HAYASHI Teruhiko, MUTO Izumi, KANEKO MIchio, TAMENARI Junichi, TOKUNO Kiyonori

CAMP-ISIJ　14　(6)　1338-1338　2001/09/01

ISSN： 0914-6628
Atmospheric Corrosion Resistance of Stainless Steels and Its Evaluation Method

Izumi Muto

Maintenance　(201)　17-22　1997/02/10
Publisher: Science Books Publishing Co.

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Books and Other Publications 11

Alloying Elements for Steels

Izumi Muto

The Iron and Steel Institute of Japan　2015/11/27

ISBN: 9784930980878
第5版鉄鋼便覧

武藤泉

(一社)日本鉄鋼協会　2014/08/31
第6版電気化学便覧

前川英己, 武藤泉, 河村純一

丸善出版　2013/01

ISBN: 9784621084137
Application of Stainless Steels as Structural Materials in Architecture and Civil Engineering

Hiroyuki Matsuyama, Izumi Muto, Masayuki Tendo, Michio Kaneko

Japan Society of Corrosion Engineering　2006/02/07
Design Manual of Light-Weight Stainless Steel Structures

薄板構造設計基準作成委

Stainless Steel Building Association of Japan　2005/02/28

ISBN: 4765524531
Present State and Problems of Evaluation Techniques for Atmospheric Corrosion

Izumi Muto

Japan Society of Corrosion Engineering　2004/04/15
腐食防食協会技術セミナー資料「ステンレス鋼の選び方、使い方」

Izumi Muto

1998/09/25
腐食防食専門委員会資料「ステンレス鋼の使用実績と腐食・劣化の防止対策」

Izumi Muto

The Society of Materials Science, Japan　1998/01/20
Applying image processing technique to corrosion monitoring of structures and examination of coating films

Izumi Muto

Japan Society of Corrosion Engineering　1996/09/20
ステンレス鋼の耐候性研究会報告書

Izumi Muto, Hiroshi Kihira

The Iron and Steel Institute of Japan　1995/11
The weatherability of the surface treatments on stainless steels and aluminium alloys

Izumi Muto

Japan Society of Corrosion Engineering　1993/11/09

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Presentations 115

Micro-electrochemical Analysis of Pit Initiation at Inclusions of Martensitic Stainless Steel

Reiya Kanda, Izumi Muto, Yu Sugawara

240th ECS Meeting
金属材料の局部腐食現象の解明と高耐食化へのマイクロ電気化学的アプローチ Invited

武藤泉

(公社)腐食防食学会「材料と環境2021」　2021/05/21
Micro-Electrochemistry of Pit Initiation at Non-Metallic Inclusions of Stainless Steels and Roles of Alloying Elements in Improving Corrosion Resistance Invited

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

PRiME 2020 (238th ECS Meeting)
ハイエントロピー合金：水溶液腐食と高耐食合金研究における新機軸 Invited

武藤泉

日本金属学会 2020年秋期(第167回)講演大会　2020/09/17
ステンレス鋼の硫化物系介在物のマイクロ電気化学特性と固溶炭素を利用した耐孔食性の向上 Invited

武藤泉, 菅原優, 原信義

シンポジウム「ステンレス鋼の腐食現象のミクロ解析」　2020/09/16
マイクロ電気化学計測によるマルテンサイト系ステンレス鋼の孔食発生起点の解析

神田玲哉, 武藤泉, 菅原優

(公社)腐食防食学会「材料と環境2020」
蛍光イメージングによるSUS430ステンレス鋼のすき間内pHと塩化物イオン濃度分布の可視化

松村健吾, 武藤泉, 菅原優

(公社)腐食防食学会「材料と環境2019」　2019/05/23
The Role of Pitting at MnS Inclusions in Intergranular Corrosion of Sensitized Type 304 Stainless Steel in NaCl Solution International-presentation

Noriyuki Ida, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

AiMES 2018 (ECS and SMEQ Joint International Meeting, 234th Meeting of The Electrochemical Society)　2018/10/01
Micro-electrochaemical analysis of the initiation of intergranular corrosion at sensitized grain boundaries in Type 304 stainless steel

Noriyuki Ida, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

2018/05/23
REAL-TIME MICROELECTROCHEMICAL OBSERVATIONS OF INITIATION AND VERY EARLY STAGE OF CORROSION ON STEELS International-presentation

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

11th International Conference on Zinc and Zinc Alloy Coated Steel Sheet (GALVATECH2017)　2017/11/12
Micro-electrochemical in situ observation of pit initiation at precipitates in AA5182 Al-Mg alloy in 0.1 M NaCl International-presentation

Yuto Sakaizawa, Izumi Muto, Yu Sugawara, Yoshiyuki Oya, Yoshihiko Kyo, Nobuyoshi Hara

232nd ECS Meeting　2017/10/01
水溶液腐食研究に関する課題と展望

武藤泉, 菅原優, 原信義

日本金属学会 2017年秋期講演大会(第161回)　2017/09/06
リアルタイムin situ観察機能付きマイクロ電気化学システムによる Al-Mg 系合金の孔食発生挙動の解析

境沢勇人, 武藤泉, 菅原優, 大谷良行, 京良彦, 原信義

材料と環境2017　2017/05/24
鋼の局部腐食機構解明と省資源高耐食化への挑戦 ―ミクロ・ナノその場解析からのアプローチ―(里見賞受賞講演)

武藤泉

日本鉄鋼協会第173回春季講演大会　2017/03/15
Effect of Cr Content on Pit Initiation Behavior at MnS Inclusions in Fe-Cr Steels International-presentation

Shinpei Asano, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

230th ECS Meeting　2016/10/02
鋼/介在物ヘテロ界面のマイクロ電気化学特性解明と界面ナノ構造制御による高耐食化原理の導出

千葉亜耶, 武藤泉, 東城雅之, 菅原優, 原信義

JST産学共創基礎基盤研究プログラム「ヘテロ構造制御」公開シンポジウム「ヘテロ構造制御で起こすイノベーション－構造用金属材料の新指導原理－」　2016/09/22
硫化物系介在物を起点とするステンレス鋼の孔食発生に及ぼすCrの影響

浅野晨平, 武藤泉, 菅原優, 原信義

材料と環境2016　2016/05/25
塩化物イオン濃度とpHの同時計測が可能な蛍光イメージングプレートの開発とステンレス鋼のすき間腐食発生過程の解析

西本昌史, 小川純一郎, 武藤泉, 菅原優, 原信義

材料と環境2016　2016/05/25
マイクロ電気化学システムによる鋼材への水素侵入挙動の計測

武藤泉, 菅原優, 原信義

(一社)日本鉄鋼協会シンポジウム「革新的水素不働態表面構築に向けてV」　2016/03/24
Microelectrochemical Investigation of Pit Initiation Site on Austenitic Cast Stainless Steel International-presentation

Asako Otake, Izumi Muto, Aya Chiba, Yu Sugawara, Nobuyoshi Hara

228th ECS Meeting　2015/10/11
A microelectrochemical approach for detecting hydrogen permeation of steel International-presentation

Izumi Muto, Yu Sugawara, Nobuyoshi Hara

ISIJ International Organized Session: Recent progress of hydrogen-passive surface on steels to prevent hydrogen　2015/09/16
マイクロ電気化学システムによるステンレス鋳鋼の孔食発生起点の解析

大竹麻子, 武藤泉, 千葉亜耶, 菅原優, 原信義

材料と環境2015　2015/05/18
マイクロ電気化学システムによるδ/γ粒界を起点とするステンレス鋳鋼の孔食発生機構の解析

大竹麻子, 武藤泉, 千葉亜耶, 菅原優, 原信義

(公社)日本金属学会 2015年春期講演大会　2015/03/18
孔食の発生過程

武藤泉

(公社)日本材料学会腐食防食部門委員会第302回例会　2015/01/30
マイクロ電気化学システムによるステンレス鋼の孔食発生機構の解析

武藤泉

(公社)日本金属学会東北支部講演会　2015/01/16
A Chemical Sensing Plate for Simultaneous Measurements of pH and Cl^- Concentration inside Crevice of Stainless Steel International-presentation

Junichiro Ogawa, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

226th ECS Meeting　2014/10/05
鋼/介在物ヘテロ界面のマイクロ電気化学特性解明と界面ナノ構造制御による高耐食化原理の導出

千葉亜耶, 武藤泉, 東城雅之, 菅原優, 原信義

JST産業共創基礎基盤研究プログラム「ヘテロ構造制御」公開シンポジウム　2014/09/25
マイクロ電気化学システムによる鋼材への水素侵入挙動の計測

武藤泉, 菅原優, 原信義

(一社)日本鉄鋼協会シンポジウム「革新的水素不働態表面構築に向けてIII」　2014/09/24
腐食・表面処理専科

武藤泉

鉄鋼工学セミナー　2014/08/21
ステンレス鋼の孔食発生過程のその場観察

武藤泉

第136回特殊鋼部会(日本鉄鋼協会生産技術部門)　2014/06/26
鉄鋼材料の局部腐食の研究(西山記念賞受賞講演)

武藤泉

日本鉄鋼協会第167回春季講演大会　2014/03/21
MnS系介在物を起点とするステンレス鋼の孔食発生に及ぼす負荷応力の影響

島橋直也, 武藤泉, 菅原優, 原信義

腐食防食学会東北支部講演会　2014/03/20
Effect of Applied Stress On Dissolution Morphology and Pit Initiation Behavior of MnS Inclusion in Stainless Steel International-presentation

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

224th ECS Meeting　2013/10/27
環境性能基礎

武藤泉

鉄鋼工学概論セミナー　2013/09/27
腐食計測・解析法－最近の進歩と上手な使い方－

武藤泉

第40 回コロージョン・セミナー　2013/08/21
水素透過用マイクロ電気化学セルの開発と鋼材の水素吸収に及ぼす介在物の影響解析

武藤泉

腐食と金属材料への水素侵入に関するミニシンポジウム　2013/05/31
マイクロ電気化学セルによるMnＳ介在物を起点とするステンレス鋼の孔食発生に及ぼす応力の影響解明

島崎直也, 武藤泉, 菅原優, 原信義

材料と環境2013　2013/05/13
マイクロ電気化学プローブによるステンレス鋼のMnS 介在物を起点とする孔食発生に及ぼす応力の影響解明

島橋直也, 武藤泉, 菅原優, 原信義

日本金属学会2013年春期講演大会（第152 回）　2013/03/27
ケルビンプローブポテンションスタットの試作と水膜下での分極曲線の計測

植田正輝, 武藤泉, 菅原優, 原信義

腐食防食学会東北支部講演会　2013/03/25
Microscopic Polarization Behavior and Thermodynamic Stability of TiS and Ti₄C₂S₂ Inclusions in Stainless Steels International-presentation

Naoya Shimahashi, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

222th ECS Meeting　2012/10/07
ステンレス鋼のすき間腐食発生過程の液性分布可視化と窒素の影響

梶武文, 武藤泉, 菅原優, 原信義

第59回材料と環境討論会(腐食防食協会)　2012/09/24
MnS介在物と鋼境界領域のマイクロ電気化学特性解明とヘテロ界面高耐食化技術の探索

東城雅之, 千葉亜耶, 武藤泉, 菅原優, 原信義

JST産学共創基礎基盤研究プログラム「ヘテロ構造制御」公開シンポジウム　2012/09/18
環境性能基礎

武藤泉

鉄鋼工学概論セミナー　2012/09/12
促進試験と腐食環境再現による耐食性評価の基礎

武藤泉

第39 回コロージョン・セミナー　2012/08/29
絶対湿度と塩付着量を制御因子とする大気腐食試験法の提案

武藤泉, 藤田栄, 梶山浩志, 藤井和美, 須賀茂雄

第32回防錆防食技術発表大会　2012/07/12
マイクロ電気化学プローブによる介在物/鋼境界領域の溶解特性解明と局部腐食防止技術の開発

学振176委員会(加工プロセスによる材料新機能発現委員会)第21回研究会　2012/07/05
炭素鋼中MnS系介在物の溶解と水素吸収作用のマイクロ電気化学プローブによる解析

篠﨑淳, 武藤泉, 大村朋彦, 沼田光裕, 原信義

日本鉄鋼協会「大気腐食反応に伴う水素発生・侵入の検出と界面反応機構の解明」シンポジウム　2012/03/29
ステンレス鋼中の硫化物系介在物のマイクロ電気化学特性と孔食発生機構

日本金属学会(第149回)2011年度秋期大会　2011/11/07
Visualization of Solution Chemistry inside Crevice by pH and pCl Sensing Plates International-presentation

Takefumi Kaji, Toshiya Sekiai, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

220th ECS Meeting　2011/10/09
環境性能基礎

武藤泉

鉄鋼工学概論セミナー　2011/09/25
電位-pH図からみた各種材料の腐食特性

第38回コロージョンセミナー　2011/08/24
材料特性から見た腐食現象とその解析法：アルミニウムとその合金

第38回コロージョンセミナー　2011/08/24
マイクロ電気化学プローブによる炭素鋼中MnS系介在物の溶解と水素吸収作用の解析

篠﨑淳, 大村朋彦, 沼田光裕, 原信義

材料と環境2011　2011/05/23
Microelectrochemical Investigation of Hydrogen Absorption and Dissolution Behavior of MnS Inclusions in Carbon Steel International-presentation

Izumi Muto, Jun Shinozaki, Tomohiko Omura, Mitsuhiro Numata, Nobuyoshi Hara

218th ECS Meeting　2010/10/10
非金属介在物を起点とするステンレス鋼の孔食発生機構― マイクロ電気化学プローブによる単一介在物の溶解機構解析 ―

表面技術協会第122回講演大会　2010/09/06
ポテンショスタットの動作原理

第37回コロージョンセミナー　2010/08/25
熱・水分移動に着目した屋外大気腐食環境のモデル化技術の開発

日本鉄鋼協会産発プロジェクト成果報告シンポジウム　2010/03/29
鉄鋼材料の大気腐食発生に関する特異性解明とそれに基づく大気腐食再現技術の開発

日本鉄鋼協会産発プロジェクト成果報告シンポジウム　2010/03/29
ステンレス鋼における介在物起点の腐食の機構解明と省資源高耐食化技術

東北大学多元物質科学研究所資源変換再生研究センターシンポジウム鉄鋼材料とレアメタル　2009/11/17
Scanning Kelvin Probe Analysis of Cut Edge Corrosion on Prepainted Galvanized Steel with Chromate-containing Epoxy Primer International-presentation

Izumi Muto, Kazufumi Sato, Nobuyoshi Hara

216th ECS Meeting　2009/10/04
電位の概念の習得と腐食防食における使い方

第36回コロージョンセミナー　2009/09/26
走査型ケルビンプローブによる建材用塗装めっき鋼板の端面防食機構の解析

「建材用塗装鋼板の端面防錆機構解明および寿命予測研究会」成果報告会　2009/05/25
Atmospheric corrosion tests involving chloride deposition and cyclic wet/dry processes at a constant absolute humidity International-presentation

Sakae Fujita, Hiroshi Kajiyama, Kazumi Fujii, Shigeo Suga

Asian-Pacific Corrosion Forum -Atmospheric Corrosion-　2009/05/24
ケルビンプローブによるステンレス鋼の大気腐食発生挙動の解析

山口健吾, 原信義

日本金属学会講演大会(第144回)　2009/03/28
走査型ケルビンプローブによる建材用塗装めっき鋼板の端面防食機構の解析

佐藤和史, 千葉亜耶, 原信義

日本鉄鋼協会講演大会(第157回)　2009/03/28
Microelectrochemistry on CrS and MnS Inclusions and Its Relation with Pitting Potentials of Stainless Steels International-presentation

Shimpei Kurokawa, Nobuyoshi Hara

214th ECS Meeting (Prime Pacific Rim Meeting on Electrochemical and Solid-State Science)　2008/10/12
鋼材表面での腐食性水膜形成に着目した大気腐食寿命予測の数値モデル化研究

山口健吾, 原信義

日本鉄鋼協会講演大会(第156回)　2008/09/23
塗装亜鉛めっき鋼板の端面防食におけるクロメートの作用機構

佐藤和史, 原信義

材料と環境討論会　2008/09/17
分極曲線の理解と解析法

第35回コロージョンセミナー　2008/08/27
マイクロ電気化学プローブによる Cr含有硫化物系介在物の電気化学的性質の解析

黒川真平, 原信義

材料と環境2008　2008/05/13
塗装Znめっき鋼板の端面腐食におけるクロメートの防食機構

佐藤和史, 赤尾昇, 原信義

日本金属学会2008年春期講演大会　2008/03/26
ポテンシォスタットの原理と電気回路

第34回コロージョンセミナー　2007/08/29
マイクロ電気化学セルによるステンレス鋼の介在物組成と孔食発生との関係解明

伊藤大毅, 原信義

材料と環境2007　2007/05/09
ダイカスト用亜鉛合金の大気腐食特性に及ぼす合金元素の影響

吉田秀紀, 小川洋, 赤尾昇, 原信義

第53回材料と環境討論会　2006/09/27
Cut Edge corrosion of prepainted 55%Al-Zn and Zn coated steels International-presentation

Tetsuji Kaneko, Nobuyoshi Hara

Recent progress of the study on edge corrosion of residential coated steel sheets (International Organized Session of the 152nd ISIJ meeting)　2006/09/18
耐食性材料の開発－材料の電気化学的防食特性の制御－

第33回コロージョンセミナー　2006/07/19
マイクロ電気化学セルによるステンレス鋼中の硫化物系介在物の電気化学特性解明

泉山雄太, 原信義

材料と環境2006　2006/05/16
塩化物環境における導電性ポリマー被覆 11Cr 鋼の電気化学的防食特性

佐藤和史, 赤尾昇, 原信義

日本金属学会2006年春期講演大会　2006/03/21
ステンレス鋼の大気腐食機構と耐候性寿命予測技術

(財)日本ウエザリングテストセンターウエザリング技術研究成果発表会　2005/11/29
ステンレス鋼の大気腐食機構解明と耐候性評価技術の現状

(社)腐食防食協会第144回腐食防食シンポジウム「大気腐食評価法の現状と問題」　2004/04/15
水道水環境でのType444鋼の耐すき間腐食性評価とパネル式受水槽への適用

小野直人, 池上修, 橋本哲郎, 今川裕二, 清須美健治

日本鉄鋼協会秋期講演大会　2003/10/11
An Approach to the Modeling of Atmospheric Corrosion Environments and Its Application to Corrosion Test for Stainless Steels International-presentation

15th International Corrosion Congress　2002/09/22
ステンレス鋼の基礎知識：耐食性

(財)山口県周南地域地場産業振興センター技術者養成講座「材料工学コース」　1999/01/19
ステンレス鋼の大気腐食における屋外環境のモデル化

日本鉄鋼協会第136回秋期講演大会　1998/09/28
ステンレス建材

(社)腐食防食協会第18回技術セミナー「ステンレス鋼の選び方使い方」　1998/09/25
ステンレス鋼の大気腐食における屋外環境のモデル化

日本鉄鋼協会中国四国支部大会　1998/08/06
海浜大気環境におけるステンレス鋼の腐食挙動支配因子

日本鉄鋼協会第135回春期講演大会シンポジウム　1998/04/01
「建材用ステンレス鋼の耐食性とその評価技術

(社)日本材料学会腐食防食専門委員会　1998/01/20
屋外大気腐食環境のモデリングと耐候性促進試験法の開発

第44回腐食防食討論会 (腐食防食協会)　1997/09/28
ステンレス鋼のさび発生挙動に及ぼす乾湿繰り返し条件の影響

紀平寛

日本鉄鋼協会第134回秋期講演大会　1997/09/24
ステンレス鋼の大気腐食損傷の定量化と耐候性評価

日本鉄鋼協会第132回秋期講演大会ステンレス自主フォーラム・シンポジウム　1996/09/29
画像処理によるステンレス鋼大気腐食挙動の定量解析

(社)腐食防食協会第110回腐食防食シンポジウム「画像処理を用いた腐食および塗装劣化の診断」　1996/09/20
海浜大気環境におけるステンレス鋼の腐食機構

紀平寛

第16回防錆技術協会発表大会　1996/07/08
Atmospheric Corrosion Behavior of Stainless Steels and Its Estimation Method International-presentation

Eiji Sato, Satoshi Ito, Hiroshi Kihira

International Congress Stainless Steels '96　1996/06/03
塩化物イオンを含む液滴下におけるステンレス鋼の孔食成長挙動に及ぼす乾燥の影響

紀平寛

腐食防食'96 (腐食防食協会)　1996/05/28
ステンレス鋼のさび発生状態の定量的評価法の開発

紀平寛

ステンレス鋼の耐候性部会成果報告会　1995/12/01
共焦点走査型レーザー顕微鏡を用いたステンレス鋼の孔食深さ自動測定システムの開発

佐藤栄次, 伊藤叡

ステンレス鋼の耐候性部会成果報告会　1995/12/01
サイクル腐食試験におけるステンレス鋼のさび発生挙動と試験条件の関係

紀平寛

ステンレス鋼の耐候性部会成果報告会　1995/12/01
Atmospheric Corrosion Behavior of Stainless Steels International-presentation

Eiji Sato, Satoshi Ito, Hiroshi Kihira

The 9th Asian-Pacific Corrosion Control Conference　1995/11/05
海浜大気環境におけるステンレス鋼のさび発生挙動

紀平寛

第42回腐食防食討論会 (腐食防食協会)　1995/09/27
大気環境におけるステンレス鋼の腐食損傷と寿命評価

日本学術振興会材料の微細組織と機能性第133委員会第147回研究会　1995/07/21
塩化物イオンを含む液滴中におけるステンレス鋼の孔食進展挙動

紀平寛

腐食防食'95 (腐食防食協会)　1995/05/24
Pitting Corrosion Behavior of Stainless Steels in Atmospheric Environments International-presentation

Eiji Sato, Satoshi Ito, Hiroshi Kihira

The International Symposium on Plant Aging and Life Prediction of Corrodible Structures　1995/03/15
ステンレス鋼の耐候性とその評価法

(社)表面技術協会各種表面処理材の耐食性評価専門部会第13回例会　1994/12/07
ステンレス鋼の発銹挙動に及ぼすサイクル腐食試験条件の影響

紀平寛

日本鉄鋼協会秋期講演大会　1994/10/07
各種大気環境におけるステンレス鋼の耐候性

紀平寛

腐食防食'94 (腐食防食協会)　1994/05/25
大気環境におけるステンレス鋼の発銹挙動の画像解析

佐藤栄次, 紀平寛

第40回腐食防食討論会 (腐食防食協会)　1993/11/12
ステンレス鋼の耐候性とその評価

(社)腐食防食協会第97回腐食防食シンポジウム「ステンレス鋼およびアルミニウム合金の表面処理とその評価法」　1993/11/09
New Electrochemical Method to Evaluate the Atmospheric Corrosion Resistance of Stainless Steels International-presentation

Eiji Sato, Satoshi Ito

The ASTM Symposium on Application of Accelerated Corrosion Tests to Service Life Prediction of Materials　1992/11/16
共焦点走査型レーザー顕微鏡を用いたステンレス鋼の孔食深さ自動測定システムの開発

伊藤叡, 佐藤栄次, 中嶋克宣, 鳥口雅祐

第39回腐食防食討論会 (腐食防食協会)　1992/10/22
An Electrochemical method to evaluate atmospheric corrosion resistance of stainless steels International-presentation

International Conference on Stainless Steels (Stainless Steel '91)　1991/06/10
各種大気環境でのステンレス鋼の腐食挙動

佐藤栄次, 伊藤叡, 安保秀雄

腐食防食'91 (腐食防食協会)　1991/05
大気環境におけるステンレス鋼の孔食進展挙動と耐穴あき性評価法

佐藤栄次, 伊藤叡, 安保秀雄

第37回腐食防食討論会 (腐食防食協会)　1990/08
中性大気環境におけるステンレス鋼の耐銹性とその実験室促進評価法

佐藤栄次, 伊藤叡, 安保秀雄

腐食防食'90 (腐食防食協会)　1990/05
アコースチックエミッション周波数分析によるTi-15V-3Al-3Sn-3Cr合金の応力腐食割れ機構の解析

杉本克久

第34回腐食防食討論会 (腐食防食協会)　1987/10

Show all Show first 5

Industrial Property Rights 75

材料表面の液性解析用蛍光イメージングデバイス

小川純一郎, 武藤泉, 菅原優, 原信義

特許第5924372号

Property Type: Patent
水素ガスセンサ及びその製造方法

原信義, 武藤泉, 朱星昱

特許第5207425号

Property Type: Patent
光学顕微鏡観察機能を備えた電気化学計測用微小電極システム

千葉亜耶, 武藤泉, 原信義

特許第5136997号

Property Type: Patent
配電用変圧器及びタンク容器

細川正雄, 河島三晃, 福井和元, 山下晃司, 武藤泉, 石丸詠一朗, 井上裕滋

Property Type: Patent
水素ガスセンサ及びその製造方法

原信義, 武藤泉, 朱星昱

特許第5176236号

Property Type: Patent
配電用変圧器

細川正雄, 河島三晃, 福井和元, 山下晃司, 武藤泉, 石丸詠一朗, 井上裕滋

特許第4917137号

Property Type: Patent
ステンレス鋼板の圧延方法

寺尾崇, 武藤泉, 井上周一, 石松孝之, 小塚淳一, 弘正規

特許第4611114号

Property Type: Patent
腐食診断方法

武藤泉, 大村圭一, 高橋明彦, 石丸詠一朗

特許第4447448号

Property Type: Patent
腐食診断部品を設けてなる配電用変圧器

細川正雄, 河島三晃, 福井和元, 山下晃司, 武藤泉, 石丸詠一朗, 井上裕滋

特許第4959937号

Property Type: Patent
塗膜密着性と耐塗装下腐食性に優れた高クロム鋼

武藤泉, 高橋明彦, 石丸詠一朗

特許第4319158号

Property Type: Patent
フェライト系ステンレス鋼板を用いた深絞り加工品

石丸詠一朗, 武藤泉

特許第4246117号

Property Type: Patent
表面光沢に優れるステンレス鋼板の製造方法

弘正規, 國岡信哉, 藤井孝樹, 小塚淳一, 武藤泉, 濱田純一

特許第4322726号

Property Type: Patent
金属材料の簡易成分分析法および簡易成分分析用組成物

武藤泉

特許第4409327号

Property Type: Patent
表面色調に優れたオーステナイト系ステンレス鋼板およびその製造方法

濱田純一, 武藤泉, 弘正規, 小塚淳一

特許第4413787号

Property Type: Patent
耐熱性に優れる金属ウール用ステンレス鋼線材および鋼線

高野光司, 多田好宣, 武藤泉

特許第4198604号

Property Type: Patent
発銹が少ないステンレス鋼板およびその製造方法

石丸詠一朗, 武藤泉, 末廣利行, 高橋明彦

特許第4170193号

Property Type: Patent
ステンレス鋼板の製造方法

武藤泉, 國岡信哉, 梁井和博, 佐藤栄次, 米倉隆行

Property Type: Patent
表面光沢に優れるステンレス鋼の製造方法

武藤泉, 濱田純一, 國岡信哉, 吉岡慎二, 弘正規

特許第4037743号

Property Type: Patent
表面性状に優れたフェライト系ステンレス熱延鋼板及びその製造方法

濱田純一, 武藤泉, 寺岡慎一, 吉岡慎二, 小川智志

特許第4218750号

Property Type: Patent
異材と接合されたステンレス鋼部品のメッキ前処理方法

武藤泉, 長崎修司

特許第3854568号

Property Type: Patent
酸濃度分析方法

武藤泉, 吉岡慎二

特許第4008309号

Property Type: Patent
フェライト系ステンレス鋼板およびその製造方法

濱田純一, 武藤泉, 吉岡慎二

特許第3878024号

Property Type: Patent
ステンレス鋼の酸洗方法

武藤泉, 水田賀夫, 寺前昭

Property Type: Patent
表面性状に優れたフェライト系ステンレス鋼板

濱田純一, 橋本聡, 山田義仁, 伊藤力, 武藤泉

特許第4306974号

Property Type: Patent
溶融塩組成物およびその補給方法

武藤泉, 水田賀夫, 嶋田敬行, 沖森麻佑巳, 寺前昭, 天藤恭太郎

特許第0003387051号

Property Type: Patent
耐拡散接合性に優れたＡｌ含有フェライト系ステンレス鋼板および製造方法

武藤泉, 札軒富美夫, 藤井芳弘, 長崎修司, 清藤英之, 加古卓三

Property Type: Patent
土中用耐食鋼

金子道郎, 武藤泉

特許第0003578663号

Property Type: Patent
ステンレス極薄箔

武藤泉, 中田潮雄, 藤井芳弘, 平嶋謙治, 長崎修司, 中塚淳, 中野健

特許第0003544488号

Property Type: Patent
ステンレス線材の脱スケールに用いる超音波水洗槽および超音波水洗方法並びにこれを用いた脱スケール装置

山田義博, 武藤泉, 水田賀夫

Property Type: Patent
耐食性の優れた建築構造用ステンレス熱延鋼板の組立方法

井上裕滋, 大北茂, 天藤雅之, 前田滋, 金子道郎, 武藤泉

特許第3939025号

Property Type: Patent
建築構造用高強度高靭性ステンレス鋼板、及びその製品、並びにこれらを用いた建築構造物

山本章夫, 武藤泉, 金子道郎

Property Type: Patent
不均一型全面腐食を発生しにくい構造用Ｃｒ鋼およびその製品

山本章夫, 武藤泉, 金子道郎

Property Type: Patent
不均一型全面腐食を発生しにくい構造用ステンレス鋼およびその製品

山本章夫, 武藤泉, 金子道郎

Property Type: Patent
孔食を発生しにくい構造用フェライト系ステンレス鋼およびその製品

山本章夫, 武藤泉, 金子道郎

Property Type: Patent
耐汚れ性および耐食性に優れた建築構造用鋼及びその製造方法並びに該鋼を用いた建築構造物

金子道郎, 山本章夫, 武藤泉, 前田滋

特許第3782578号

Property Type: Patent
スケール中のクラック発生が少なく耐食性に優れた建築構造用熱延鋼帯とその製造方法

前田滋, 山本章夫, 武藤泉

特許第3999344号

Property Type: Patent
耐食性に優れた建築構造用ステンレス熱延鋼帯とその製造方法

前田滋, 山本章夫, 武藤泉

Property Type: Patent
耐食性に優れた建築構造用ステンレス熱延鋼帯と製造方法

前田滋, 山本章夫, 武藤泉

Property Type: Patent
建築構造用ステンレス鋼

天藤雅之, 山本章夫, 武藤泉

Property Type: Patent
建築構造用ステンレス溶接角管

金子道郎, 山本章夫, 武藤泉

Property Type: Patent
建築構造用ステンレス鋼帯の製造方法

天藤雅之, 山本章夫, 武藤泉

特許第3839953号

Property Type: Patent
耐圧壊性の優れた高強度ステンレス鋼管とその製造方法

山本章夫, 武藤泉

特許第0003510105号

Property Type: Patent
曲げ性の優れた高強度高靭性ステンレス鋼板

山本章夫, 武藤泉

特許第0003510787号

Property Type: Patent
屋内環境における高強度ボルトとステンレス鋼の異種金属接触腐食防止方法

武藤泉, 山本章夫

Property Type: Patent
建築用鋼管内部の腐食防止方法

武藤泉, 山本章夫

Property Type: Patent
意匠性に優れたステンレス鋼又はチタンおよびその製造方法

武藤泉, 山本章夫

特許第4053127号

Property Type: Patent
土木建築用防錆鋼材

武藤泉, 山本章夫

特許第0003488078号

Property Type: Patent
さび止め油による防錆処理性に優れた鋼材の製造方法

武藤泉, 山本章夫

特許第3839946号

Property Type: Patent
局部腐食の起こりにくい低腐食速度鋼板

武藤泉, 紀平寛

特許第0003039630号

Property Type: Patent
大気腐食の促進試験方法

武藤泉

Property Type: Patent
耐食性に優れた発色チタンの製造方法およびその発色チタン

武藤泉, 山岸和夫

特許第0003453257号

Property Type: Patent
チタン薄板およびその製造方法

高山勇, 高橋一浩, 武藤泉, 山下義人, 木村欽一, 山崎達夫, 徳野清則, 為成純一, 竹田修

特許第0003352885号

Property Type: Patent
曲げ加工性および耐食性の優れた土木建築構造用ステンレス鋼板

藤田展弘, 武藤泉, 山本章夫

Property Type: Patent
溶融塩中での耐食性と電気伝導性に優れた溶融塩電気分解電極用ステンレス鋼

武藤泉, 紀平寛

Property Type: Patent
耐食性と電気伝導性に優れた溶融塩電気分解電極用ステンレス鋼

武藤泉, 紀平寛

特許第0003565661号

Property Type: Patent
意匠性に優れたステンレス鋼の製造方法

武藤泉, 紀平寛

特許第4202436号

Property Type: Patent
耐食性の優れたフェライト系ステンレス鋼の製造方法

阿部雅之, 木村謙, 武藤泉, 紀平寛

Property Type: Patent
防眩性と耐食性を兼ね備えたステンレス鋼板

武藤泉, 紀平寛

特許第0003499361号

Property Type: Patent
耐変色性に優れたチタン及びチタン合金の製造方法

武藤泉, 紀平寛

Property Type: Patent
耐銹性に優れたステンレス鋼

武藤泉, 紀平寛, 上田全紀

特許第0003510700号

Property Type: Patent
耐銹性と加工性に優れたフェライト系ステンレス鋼板

武藤泉, 紀平寛, 上田全紀, 中田潮雄

0003224694

Property Type: Patent
高明度・低彩度の色調を有する陽極酸化による発色チタン材または発色チタン合金材

田籠直子, 武藤泉, 紀平寛, 高橋康雄, 添田精一

特許第0003117876号

Property Type: Patent
酸化皮膜の密着性に優れた発色チタン材の製造方法

田籠直子, 武藤泉, 山岸和夫, 渡辺与七

特許第3655932号

Property Type: Patent
加工性と耐銹性に優れたフェライト系ステンレス鋼光輝焼鈍材

武藤泉, 紀平寛

0003268927

Property Type: Patent
高耐食性表面改質ステンレス鋼

今福宗行, 島田春男, 武藤泉, 紀平寛

特許第0003283655号

Property Type: Patent
高耐候性オーステナイト系ステンレス鋼光輝焼鈍材の製造方法

武藤泉, 伊藤叡, 佐藤栄次

特許第0003052170号

Property Type: Patent
溶融硝酸塩電解による純酸素製造方法

武藤泉, 伊藤叡, 佐藤栄次

特許第0003078130号

Property Type: Patent
局部腐食深さ自動測定方法

武藤泉, 伊藤叡, 佐藤栄次, 室田昭治

特許第0003152507号

Property Type: Patent
溶融炭酸塩型燃料電池

武藤泉, 伊藤叡

特許第0003122955号

Property Type: Patent
窒素含有化合物を有する耐銹性に優れたステンレス鋼

武藤泉, 伊藤叡, 上田全紀, 末広利行

特許第0002952840号

Property Type: Patent
溶融炭酸塩型燃料電池セパレータ用高耐食鋼板

武藤泉, 伊藤叡

Property Type: Patent
溶融炭酸塩型燃料電池用耐食ステンレス鋼

武藤泉, 伊藤叡

特許第2932211号

Property Type: Patent
自動車モール材用フェライト・オーステナイト２相ステンレス鋼

武藤泉, 伊藤叡, 水沼武久, 宮嶋俊平

Property Type: Patent
高精度局部電気化学計測用微小作用電極、高精度局部電気化学計測用微小作用電極の作製方法および高精度局部電気化学計測用微小作用電極の絶縁被覆層の剥離方法

門脇万里子, 武藤泉, 井田憲幸, 菅原優, 原信義

特許第6143040号

Property Type: Patent
局部電気化学現象解析のための微小作用電極

千葉亜耶, 武藤泉, 菅原優, 原信義

特許第5987230号

Property Type: Patent

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Research Projects 28

Chemical Conversion Coating Competitive

System: The Other Research Programs

2005/04 - Present
Control of Nonuniformity on Material Surfaces Competitive

System: The Other Research Programs

2005/04 - Present
Corrosion Prevention and Service Life Prediction Competitive

System: The Other Research Programs

2005/04 - Present
生体内均一吸収性を有する整形・口腔外科等医療用新規インプラントMg系合金の開発 Competitive

西本昌史, 武藤泉

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2025/04 - 2029/03
非平衡組織と多相化の探求による耐食性に優れる電気接点用Cu合金の創製 Competitive

武藤泉, 西本昌史

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2025/04 - 2028/03
ナノ複相組織が創発する電気接点用Cu合金の新規高耐食化原理の探求

武藤泉, 西本昌史, 菅原優

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的研究(萌芽)

Institution: 東北大学

2023/06/30 - 2025/03/31
光触媒を第二相とする省資源型高耐食ステンレス鋼の創製とナノレベル電気化学反応解析

武藤泉, 西本昌史, 菅原優

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(A)

Institution: 東北大学

2022/04/01 - 2025/03/31
Creation of Smart Alloys with Anticorrosion Functions: A Change in Concept from Solid Solution of Corrosion-Resistant Elements to Secondary Phases

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2021/07/09 - 2023/03/31
ハイエントロピー効果に基づく新材料創製と新機能創出

加藤秀実, 和田武, 武藤浩行, 武藤泉, 佐々木拓也, 西山宣正

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2018/06/29 - 2023/03/31

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A01イ班ではハイエントロピー（HE）効果に基づく新材料創製と新機能創出を目的として研究を行っている。本班で推進している５つの研究テーマについて当該年度に得られた成果は下記の通りである。（１）HE合金のナノ多孔およびナノ複合化：前年度に得たMg/Fe基ヘテロ材料中にAl、Ni、Yを添加することでMg相を多元化し、析出強化や固溶強化によってヘテロ材料の強度を向上するとともに延性を維持することに成功した。（２）HE耐食合金設計：塩化物水溶液での孔食に対してはCr2O3を含有する不働態皮膜が保護作用を発揮し，高温酸化に対してはAl2O3系酸化スケールが生成し耐酸化性を確保するAl8Co19Cr23Fe32Ni18合金を開発した。この合金を1M-H2SO4中で動電位アノード分極することで、耐酸化性を維持したまま孔食発生電位を上昇させることに成功した。（３）HEセラミックスの超高圧合成：遷移金属とNH4Clとの混合する高圧合成法を用いて5族（V, Nb, Ta）および6族（Cr, Mo, W）の遷移金属からなる多成分系遷移金属窒化物を高圧下で合成し、その結晶構造を明らかにした。（４）HEセラミックスの新規ヘテロ構造化：多元系複合顆粒を作製するためのプロセスマップを提案し，ヘテロ凝集領域，つまり，複数種のサスペンションが混合された後に「見かけのζ電位」がゼロ付近になる状態を予想することで，用いる原料粒子の粒径，組成比を加味してそれぞれのサスペンションのζ電位を解析的に決定することができる手法を確立した（５）HE合金のバルク金属ガラス化：(Zr1-xHfx)65Cu20Al10Ni5合金をハイエントロピー化することでガラス転移、核生成、結晶化が抑制されることが分かり、ハイエントロピー化によって液相が均質化されていることや、液相、結晶中で遅い拡散が生じている可能性があることが分かった。
A new alloy design concept for high-corrosion resistant steels based on micro-electrochemistry of local dissolution and repassivation

Muto Izumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2017/04/01 - 2020/03/31

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The initiation sites and morphology during the early stage of pitting on pearlite strucure were investigated. Pits were initiated in the ferrite lamellae and proceeded along the ferrite lamellae. Cementite acts as a barrier against the pit growth. In as-quenched and tempered martensitie, interstitial carbon was found to improve pitting corrosion resistance. Short-time tempering of martensite was suggested to be a feasible approach to striking an optimal balance between facilitating corrosion resistance and achieving the desired mechanical properties . For stainless steels, the addition of inhibitor to sulfide inclusions was determined to improve pitting corrosion resistance at sulfide inclusions. It was demonstrated that Ce3+ ions are likely to be produced by the dissolution of Ce-containing inclusions, and the Ce3+ ions inhibit trench formation at the sulfide/steel matrix boundary, resulting in improved pitting corrosion resistance at sulfide inclusions.
Surface Treatments for the Suppression of Hydrogen Absorption into Steels

SUGAWARA YU, KUDO Tomohiro, HAYASHI Tomoki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2016/04/01 - 2018/03/31

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In order to suppress hydrogen absorption into steels, we tried to form the formation of nitrided layer on surfaces of the pure iron specimens using plasma nitriding because nitrogen is an interstitial element similar to hydrogen. It is found that the iron specimen with nitrogen compound layers composed of Fe2-3N and Fe4N on the surface showed much lower hydrogen permeability than the untreated specimen. In addition, nitrogen martensite layer formed by plasma nitriding and subsequent quenching slightly suppressed hydrogen permeation in the iron specimen.
Improvement of Corrosion Resistance of Metallic Materials by the Formation of Supersaturated Solid Solution Phases

Muto Izumi, INOUE WAKA, KADOWAKI MARIKO

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2015/04/01 - 2017/03/31

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Steels were subjected to low-temperature carburizing treatment to add excess interstitial carbon to its surface. Supersaturated solid solution phases of carbon-steel were successively formed on Type 304 stainless steels. No pitting was initiated on the carburized stainless steel in 0.1 M NaCl at 298 K. A mixed gas of H2 and CH4 was found to be suitable for improving the corrosion resistance in chloride solutions. The stability of austenitic phases of the steels was likely to be a key factor affecting the pitting corrosion resistance. The outer region of the carburizing layer was sensitized, but the inner region of the carburizing layer indicated superior corrosion resistance in 0.1 M NaCl.
Fabrication of nanoporous Fe from Fe-based hetero-amorphous alloy and its application to metal-air battery

HARA NOBUYOSHI, MUTO Izumi, SUGAWARA Yu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2014/04/01 - 2016/03/31

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In order to develop a high performance negative electrode for next generation metal-air batteries, a new fabrication technique of nanoporous Fe with bimodal structures was examined. Amorphous Fe85Si2B8P4Cu1 (a-Fe) alloy ribbons were used as a starting material and heat-treatments were applied to form a mixed structure consisting of α-Fe nanocrystals with a diameter of 20nm and a-Fe matrix. The selective dissolution of α-Fe nanocrystals was carried out by anodic polarization in weakly acidic sulfate solutions to form a bimodal structure consisting of ligaments (residue of a-Fe matrix) and pores (trace of α-Fe dissolution). The nanoporous Fe showed the reversible oxidation and reduction behavior in alkaline solutions and thus the applicability as a positive electrode of metal-air batteries.
A hydrogen permeation cell using electrochromic thin film to elucidate preferential sites of hydrogen entry

SUGAWARA YU, HARA Nobuyoshi, MUTO Izumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2014/04/01 - 2016/03/31

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In order to visualize a distribution of hydrogen absorbed into steels from liquid phase, a new electrochemical hydrogen permeation cell using a Tungsten oxide (WO3) thin film, which has an electrochromic property, was fabricated. In the new hydrogen permeation cell, hydrogen, which was absorbed and was permeated through steels, was detected by the change of the color of WO3 formed in the hydrogen detection side, accompanied by the formation of HxWO3. Reactive RF magnetron sputtering using a Tungsten disk target was suitable for the formation of WO3 thin films in this hydrogen detection system. The parameter of brightness Y in a YUV format was effective in evaluating the change of the color of WO3 thin films during the hydrogen permeation tests because the color of WO3 darkened gradually by the formation of HxWO3.
Comprehensive understanding of crevice corrosion mechanism for stainless steels and corrosion-resistant alloy design by visualization of solution chemistry inside the crevice

Muto Izumi, HARA NOBUYOSHI, SUGAWARA YU

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2013/04/01 - 2016/03/31

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A sensing plate for the simultaneous measurements of pH and chloride ion concentration was newly developed. Terbium-dipicolinic acid complex and quinine sulfate were used to measure the pH and chloride ion concentration, respectively. In the incubation period of the crevice corrosion, the pH inside the crevice gradually decreased from 3.0 to ca. 2.5, and the chloride ion concentration increases from 0.01 to ca. 0.18 M. The generation of the micro-pit led to a sharp decrease in pH to below 0.5 and an increase in the chloride ion concentration to above 4 M. In addition, the electrode potential inside the crevice was expected to be in the passive-active transition region of stainless steels. The local dissolution caused by the passive-active transition in a weak acid environments was likely to be the initiation of the crevice corrosion of stainless steels.
A Microelectrochemical Approach to Understanding Hydrogen Absorption into Steels and Prevention Technique against Hydrogen Embrittlement by Surface Modification

MUTO Izumi, SUGAWARA Yu, HARA Nobuyoshi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2013/04/01 - 2015/03/31

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A small Devanathan-Stachurski cell was newly designed to ascertain the hydrogen absorption behavior into steels during corrosion. On a small area with MnS inclusions, the current of hydrogen permeation increased sharply when the NaCl solution was placed on the steel surface. On the other hand, no permeation current was observed on the area without the inclusions. MnS inclusions were likely to accelerate the steel dissolution and the hydrogen adsorption into the steel. Type 304 stainless steel was subjected to low-temperature carburizing treatment to add excess interstitial carbon to its surface. No pitting was initiated on the carburized steel in NaClsolutions. It was clarified that the carburizing treatment inhibits the active dissolution rate of the steel matrix to about one hundredth. The carburization treatment was likely to suppress the hydrogen adsorption into the steels.
Development of pit initiation mechanism from MnS inclusions in stainless steel and new principles for improving pitting resistance

HARA NOBUYOSHI, MUTO Izumi, SUGAWARA Yu, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2012/04/01 - 2015/03/31

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In order to improve the pitting corrosion resistance of stainless steels without the addition of a large amount of rare metals such as Cr and Mo, the mechanism of pit initiation at MnS inclusions has been examined and an new method for improving pitting resistance has been developed. While the inclusions dissolve under anodic polarization, elemental sulfur is deposited at the boundaries between the inclusions and steel matrix. The synergistic effect of the elemental sulfur and chloride ions causes the breakdown of passivity at the boundaries to form trenches, in which pit is initiated when pH and potential satisfy a critical condition of pit growth. Based on this pit initiation mechanism, the inhibition of the active dissolution of steel matrix in acidic chloride solutions seems to be beneficial. By using the combinatorial approach, it was proposed that the addition of a small amount of Sn (<1%) was effective to improve pitting resistance.
Development of high performance hydrogen sensors using noble metal added nanoporous oxides

HARA NOBUYOSHI, MUTO Izumi, SUGAWARA Yu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2012/04/01 - 2014/03/31

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In order to develop hydrogen gas sensors with superior response characteristics, a new fabrication technique of nanopoprous oxides containing noble metal nanoparticles has been examined. Amorphous Ti-xCu (x=30-60at%) alloys containing a small amount of noble metals such as Au, Ag, Pd, Pt were used as a starting material and dealloying treatments were applied to form nanoporous Cu or Ti with bimodal structures consisting of ligaments and pores. The dealloying in HF solutions resulted in the formation of nanoporous Cu with bimodal structures enriched with noble metals. The addition of a few at% noble metals effectively reduced the size of pores to a few nm. The dealloying in HCl-HNO3 mixtures leaded to the production of a Ti enriched nanoporous Ti-Cu alloy covered with Ti oxide films.
Development of high-corrosion resistance Mg-Li alloy using the combinatorial approach method

AKAO Noboru, HARA Nobuyoshi, MUTOH Izumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2012/04/01 - 2014/03/31

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In order to develop a high corrosion-resistant Mg-Li alloy in aqueous environments, the Mg-Li alloy thin film having continuous Li-content depend on the location on the substrate are synthesized by using the ion-beam-sputter-deposition method. The corrosion resistance on each microscopic continuous part of Mg-Li thin film are evacuated by the local electrochemistry measurement according to the combinatorial approach method. To estimate of the corrosion-resistant of the specimen on each microscopic part of the film, the local electrochemistry measurement which used a micro- electrochemistry cell are carried out on the same specimen, continuously. In addition, to reveal the improvement mechanism for the corrosion behavior of Mg-Li alloy, the chemical state of the early stage oxidized film and passive film on the Mg-Li alloy are analyzed by X-ray photoelectron spectroscopy(XPS), Auger electron spectroscopy(AES) and in-situ ellipsometry on the the Mg-Li alloy film depend on Li content.
Terahertz spectroscopic detection of fine structures for Zinc phosphate

TANABE Tadao, MUTO Izumi, OYAMA Yutaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2011 - 2013

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The energy of terahertz wave is as low as room temperature, for example, whose energy level corresponds to hydrogen bonding, van der Waals interactions. The terahertz wave is sensitive to soft materials such as hydrate as well as to wet conditions. In this study, the terahertz detection of fine structures for Zinc phosphate has been described. Terahertz spectra have been measured for Zinc phosphate with various hydration structures. The frequency tunable narrow band terahertz wave was generated by difference frequency generation of two near infrared beams from a GaP crystal. Based on the terahertz spectra, the reflection absorption imaging of terahertz wave was applied to detection of corrosion products on steel sheets. It was found that the terahertz wave technique is very available for non-destructive corrosion inspection of metal surface.
A resource-saving technology for high corrosion-resistant steels by improving electrochemical property of non-metallic inclusions

MUTO Izumi, HARA Nobuyoshi, SUGAWARA Yu, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2011 - 2012

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To analyze microscopic corrosion mechanisms of metals, a microelectrochemical system for in situ high-resolution optical microscopy was developed and applied to the real-time observation of pit initiation at MnS inclusion in stainless steels. It was directly observed that pits were initiated at the MnS/steel boundaries, and that deep trenches were generated at these boundaries during anodic polarization. The metal-oxide enriched surface layer on inclusions was found to be the predominant factor affecting the electrochemical properties and the corrosion protection ability of the inclusions.
Development of prevention technology of hydrogen absorption for steels by improving electrochemical property of non-metallic inclusions

MUTO Izumi, HARA Nobuyoshi, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

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A micro permeation cell for studying hydrogen absorption behavior in a small area on metals was developed. The preferential sites of hydrogen absorption of carbon steel surfaces were found to be MnS inclusions in near-neutral environments. It was demonstrated that the hydrogen permeation currents were extremely increased by the dissolution of MnS inclusions. HS- ions released from the sulfide dissolution promote the hydrogen absorption reaction on steel surfaces. Ti(C,N) inclusions do not dissolve and do not promote the hydrogen absorption in near-neutral environments.
Development of CWD process for surface treatment of magnesium

HARA Nobuyoshi, MUTO Izumi, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: Tohoku University

2010 - 2011

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In order to develop a cyclic wet-dry (CWD)process as a new surface treatment method for improving corrosion resistance of Mg alloys, the composition of starting solution, the process conditions and the corrosion resistance of reaction products have been examined. It was found that hydrotalcite ((Mg_6Al_2(OH)_<16> CO_3・4H_2O))or hydrotalcite-like compounds can be formed under well-controlled CWD conditions using NaCl+ AlCl_3 or Na_2SO_4+ Al_2(SO_4)_3 solutions and they improves the corrosion resistance of Mg alloys.
マイクロドット蛍光イメージングプレートによる実在表面における不均一腐食の機構解析

武藤泉, 原信義, 赤尾昇

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 挑戦的萌芽研究

Institution: 東北大学

2009 - 2010

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本研究において新規に開発した蛍光イメージングプレートを用い、ステンレス鋼のすき間腐食発生過程における水素イオン濃度(pH)と塩化物イオン濃度の面分布をリアルタイム可視化分析した。試験片には、マンガンを添加したオーステナイト系ステンレス鋼(Fe-18Cr-10Ni-5.4Mn)を使用した。試験液としては、希硫酸でpHを3.0に調整した0.01M NaCl(298K)を用い、Ag/AgCl(3.33M KCl)電極基準で0.3Vに定電位分極を行った。イメージングプレートの外観を100秒ごとに光学顕微鏡で撮影し、その色調(RGB値)からpHおよび塩化物イオン濃度への換算を行った。定電位分極開始と共に、電流値は低下し、3000秒程経過した後に、すき間腐食の発生により徐々に増加することが分かった。水素イオン濃度(pH)は、最初の500秒程は変化が見られないが、その後徐々に低下し、pH2を下回ったところ(約1.8)でエッチピットが発生することが分かった。そして、このエッチピットの発生により、その周囲のpHが0.5程度まで直ちに低下し、すき間腐食がマクロ的に広がって行くことが解明された。一方、塩化物イオン濃度に関しては、すき間腐食が発生する前に顕著な濃度上昇は見られなかった。これは、Cl^-イオンがステンレス鋼から溶出したCr^<3+>イオンと錯イオンCrCl^<2+>を形成し、Cl^-イオンとしては高い濃度に到達しないためであると推察される。しかし、塩化物イオンを含まないpH3.0のNa_2SO_4を用いた場合には、すき間腐食は発生しなかったため、すき間腐食を引き起こすエッチピットの発生には0.O1M程度の塩化物イオン濃度の存在は不可欠であると推定される。また、同様の実験を窒素添加オーステナイト系ステンレス鋼(Fe-18Cr-10Ni-5.4Mn-0.28N)に対して実施した。その結果、すき間腐食の発生過程であるエッチピットは発生するものの、すき間腐食へ成長しないケースが多く見られた。窒素はすき間腐食発生過程であるエッチピットを再不働態化させる作用があるものと考えられる。
Development of green stainless steels by micro-and nano-scale surface design and control

HARA Nobuyoshi, MUTO Izumi, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2008 - 2010

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In order to develop a new passivation method for removing MnS from the surface of stainless steels and forming a Cr enriched passive film on the surface, microelectrochemical electrochemical properties of MnS and chemical dissolution behaviors of MnS in chelate-containing solutions have been examined. It was found that citric acid system solutions are effective to remove MnS and to improve corrosion resistance of stainless steels.
Relationship between Nano-topology and Corrosion Resistance of Metallic Thin Films Prepared by Ion-Beam-Sputter Deposition Method

AKAO Noboru, HARA Nobuyoshi, MUTO Izumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2007 - 2008
Visualization of change in solution chemistry during corrosion process and its application to improve corrosion resistance of metallic materials

MUTO Izumi, HARA Nobuyoshi, AKAO Noboru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2006 - 2008
太陽光照射により防食機能を自己再生する有機コーティングの創製

武藤泉, 原信義, 赤尾昇

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 萌芽研究

Institution: 東北大学

2006 - 2007

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導電性ポリマーであるポリアニリンを用い、Fe-11Cr鋼の表面に酸化重合膜を形成し、乾湿繰り返し下での防食機構解析を実施。腐食試験用に屋外の気温と相対湿度の日変化を忠実に再現できる気象シミュレータを作製し、この中で塩化物イオン付着量を0.001〜1.0g/m^2の範囲で変化させた。膜が健全な部分では1.0g/m^2の塩化物イオン付着量でも、赤さび発生は見られないことから、膜自体の環境遮断機能は優れていることが分かった。膜欠陥部(クロスカット部)に関しては、研磨ままの試験片では塩化物イオン付着量0.001〜0.1g/m^2の条件で軽微な赤さび発生が見られたが、ポリアニリン酸化重合膜をコーティングした場合には赤さび発生が見られなかった。腐食試験後、クロスカットの周囲のみポリアニリンが変色していたことから、ポリアニリン膜と露出金属部との電気化学的なカップリングにより防食機能を示す可能が示唆された。しかし、塩化物イオン付着量1.0g/m^2の条件では、グロスカット部からポリアニリン膜/下地界面に塗膜下腐食が起こり、コーティング膜の剥離が生じた。乾湿が繰り時の電位変化を解析した結果、ポリアニリン酸化重合膜をコーティングした試験片は、乾湿繰り返し環境で、研磨ままの材料よりもやや貴な電位を示すことが分かった。塩化物イオン付着量が少なく孔食発生電位が低い際には、酸化体被覆により不働態化が促進される。しかし、塩化物イオン付着量が高く孔食発生電位が低下する環境では、酸化体の有する貴な電位が、皮膜欠陥部において、孔食を誘発する危険性があることが明らかになった。尚、厳しい腐食環境でのポリアニリンの塗膜下腐食を防止するため現在用いられているクロメート(SrCrO_4)について端面防錆機構をケルビンプローブで解析したところ鋼母地のアノードおよびカソード反応速度を抑制していることが分かった。

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Social Activities 2

東北大／ステンレス鋼のすき間腐食／２要素を同時計測／省資源方高耐食鋼目指す

2016/03/02 -
臨界値で突然発生——ステンレス鋼の腐食を可視化

2016/02/25 -

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東北大学は2016年2月24日、水溶液中における金属表面の水素イオン濃度指数（pH）と塩化物イオン濃度の分布を同時計測できる蛍光イメージングプレートを開発し、ステンレス鋼のすき間腐食が発生する過程を可視化することに成功したと発表した。腐食はゆっくり進行するのではなく、すき間内溶液組成が臨界値に達すると突然発生することが観察された。

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鋼／介在物ヘテロ界面のマイクロ電気化学特性解明と界面ナノ構造制御による高耐食化原理の導出

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目的：鋼／介在物ヘテロ界面のマイクロ電気化学特性解明と界面ナノ構造制御による高耐食化原理の導出概要：ヘテロ組織の利用により、材料の機械的特性は飛躍的に向上する。しかし、化学的に不均一な材料は腐食しやすいため、ヘテロ組織を積極的に活用した材料は、耐食性が低くなることが懸念される。そこで、ヘテロ組織の高耐食化の基盤構築のため、マイクロメートルオーダーの微小領域の電気化学特性を計測できる技術を駆使し、腐食起点の代表例である鋼と介在物（鋼／介在物）のヘテロ界面の腐食機構を解明する。さらに、ヘテロ界面組成・構造制御による高耐食化原理の導出に取り組む。
腐食性水膜下での金属材料の分極挙動計測技術に関する研究

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非接触電位センサーであるケルビン(Kelvin)プローブにポテンショスタットの機能を組み込んだ電気化学計測システムを開発し、大気腐食環境を模擬した厚さ500μm以下の薄い水膜下における金属材料のアノードおよびカソード分極曲線を計測し、大気腐食機構の解析を行う。
ISO16539 (Method A)国際規格の提案と規格化
産学人材育成パートナーシップ事業 “鉄鋼分野における産学人材育成パートナーシッププロジェクト”

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産学人材育成パートナーシップ事業 “鉄鋼分野における産学人材育成パートナーシッププロジェクト”用教育教材の開発
鉄鋼材料の大気腐食寿命を数値シミュレーションするための基盤技術構築に係る研究

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目的：１.大気腐食反応が進行する時刻を特定し、反応のトリガーとなる気象因子と実反応時間を明確化することで大気腐食の数値シミュレーションの基盤を構築する。２.防食機構の異なる3鋼種(Znめっき鋼板、ステンレス鋼、耐候性鋼)に対し、各種大気環境での腐食挙動を再現できる装置「腐食環境シミュレータ」を開発する。目標：１.屋外大気腐食環境で水膜の腐食性と、鋼材の電位をモニタリングできるセンサーとシステム類の開発２.海塩粒子発生と材料への付着および乾湿繰り返し過程を再現可能な促進試験装置の開発と、腐食反応支配因子の解明と試験条件最適化。提案する方式の内容：①材料表面に形成される腐食性水膜環境のモニタリング・システムの開発、②腐食発生時刻とその際の水膜状態解析による大気腐食支配因子の解明、③腐食性エアロゾル発生と付着を模擬した腐食環境再現装置の開発、④液膜内腐食反応機構の解明
再処理プロセス溶液の熱力学検討の調査

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再処理プロセス溶液の熱力学検討の調査
鋼材表面での腐食性水膜形成に着目した大気腐食寿命予測の数値モデル化研究

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目的：世界各地の任意の屋外大気環境を模擬可能な「耐候性促進試験法」と、鉄鋼材料の「寿命予測数値シミュレーション技術」の構築。概要：大気腐食は鉄鋼材料の実用上重要な現象であるが、関連するパラメータが多く未成熟な分野である。しかし、申請者らをはじめとする複数の研究により、大気腐食は1年間で10日程度の「特異日」に集中的に起こる可能性が高いことが分かってきた。そこで、①特異日出現の気象学的要因解明、②特異日の材料表面の腐食環境再現(＝促進試験法の開発)、③その環境で何故腐食が発生するのかの原因解明と侵食挙動の数値化を行う。そして、「気象・地理的データからの特異日出現頻度の予測法」と、「特異日の腐食侵食挙動のモデル化」を行い、各種環境と材料に適用可能な数値シミュレーションによる寿命予測技術の構築を目指す。特異日の解明・再現では、大気腐食の反応の場となる「鋼材表面に形成される腐食性物質や金属イオンが濃縮した水膜の性状」に着目し研究を展開する。また、なぜ特異日にしか腐食しないのかという疑問に対しても、新材料開発の糸口とするため、非接触表面電位計測などの電気化学手法により解明を試みる。材料は、めっき鋼板とステンレス鋼を対象として取り組む。
新規日本工業規格の提案と規格化(JIS G 0595)

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