Details of the Researcher

PHOTO

Hiroshi Kakinuma
Section
Institute for Materials Research
Job title
Assistant Professor
Degree

  • 博士（工学）（東北大学）

  • 修士（工学）（東北大学）

Research History 4

  • 2025/04 - Present
    National Institute for Materials Science

  • 2023/04 - Present
    Tohoku University　Institute for Materials Research Environmentally Robust Materials　Assistant Professor

  • 2021/04 - 2023/03
    Tohoku University　Institute for Materials Research Environmentally Robust Materials

  • 2019/04 - 2021/03
    Japan Society for the Promotion of Science　Research Fellowship for Young Scientists

Education 3

  • Tohoku University　Graduate School of Engineering　Department of Materials Science

    2018/04 - 2021/03

  • Tohoku University　Graduate School of Engineering　Department of Materials Science

    2015/04 - 2018/03

  • Tohoku University　School of Engineering　Department of Materials Science and Engineering

    2011/04 - 2015/03

Committee Memberships 1

  • 日本鉄鋼協会東北支部　支部幹事

    2024/03 - Present

Professional Memberships 5

  • The Japan Institute of Light Metals

  • Japan Society of Corrosion Engineering

  • The Japan Institute of Metals and Materials

  • The Iron and Steel Institute of Japan

  • The Electrochemical Society

Research Interests 8

  • Corrosion resistance

  • Conversion coatings

  • Mg alloys

  • Steels and Stainless Steels

  • Al alloys

  • Electrochemical measurements

  • Hydrogen embrittlement

  • Corrosion

Research Areas 2

  • Nanotechnology/Materials / Structural and functional materials /

  • Nanotechnology/Materials / Material fabrication and microstructure control /

Awards 6

  1. Best Poster Award

    2023/12　The 7th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 6th Symposium on International Joint Graduate Program in Materials Science and Spintronics　Filming microscopic hydrogen diffusion behaviors in metals using an ultrasensitive hydrogenochromic sensor

  2. Materia Japan Award for Science and Technology

    2025/09　The Japan Institute of Metals and Materials　Techniques for Visualizing Hydrogen Diffusion in Metals Using Polyaniline

  3. The Best Paper Award for Budding Author

    2022/09　The Japan Institute of Metals and Materials

  4. The Japan Institute of Metals and Materials Metallography Award

    2022/03　The Japan Institute of Metals and Materials

  5. 若手講演奨励賞

    2017/05　Japan Society of Corrosion Engineering

  6. 学生ポスターセッション 優秀賞

    2016/09　The Iron and Steel Institute of Japan

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Papers 22

  1. Semi-quantitative characterisation of coherency-dependent hydrogen diffusion at Σ3 grain boundaries in pure Ni International-journal Peer-reviewed

    Hiroshi Kakinuma, Motomichi Koyama, Rama Srinivas Varanasi, Saya Ajito, Eiji Akiyama

    Materials Research Letters　13　(4)　357-364　2025/01/24

    Publisher: Informa UK Limited

    DOI： 10.1080/21663831.2025.2457369 　

    eISSN： 2166-3831

  2. Mechanism of local hydrogen entry into Fe sheets induced by atmospheric corrosion: Significance of potential, pH, and rust layer thickness International-journal Peer-reviewed

    Hiroshi Kakinuma, Sachiko Hiromoto, Tomohiko Hojo, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    Corrosion Science　232　112043-112043　2024/05/15

    Publisher: Elsevier BV

    DOI： 10.1016/j.corsci.2024.112043 　

    ISSN： 0010-938X

  3. In situ visualization of misorientation-dependent hydrogen diffusion at grain boundaries of pure polycrystalline Ni using a hydrogen video imaging system International-journal Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama

    Acta Materialia　263　119536-119536　2024/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2023.119536 　

    ISSN： 1359-6454

  4. Real‐Time Visualization of Hydrogen Distribution in Metals Using Polyaniline: An Ultrasensitive Hydrogenochromic Sensor International-journal Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama

    Advanced Materials Interfaces　9　(18)　2101984-2101984　2022/06

    Publisher: Wiley

    DOI： 10.1002/admi.202101984 　

    ISSN： 2196-7350

    eISSN： 2196-7350

  5. Improving the pitting corrosion resistance of AA1050 aluminum by removing intermetallic particles during conversion treatments International-journal Peer-reviewed

    Kakinuma, H., Muto, I., Oya, Y., Momii, T., Sugawara, Y., Hara, N.

    Materials Transactions　62　(8)　2021

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.MT-M2021071 　

    ISSN： 1345-9678

  6. Mechanism for the morphological change from trenching to pitting around intermetallic particles in AA1050 aluminum International-journal Peer-reviewed

    Kakinuma, H., Muto, I., Oya, Y., Kyo, Y., Sugawara, Y., Hara, N.

    Journal of the Electrochemical Society　166　(2)　C19-C32　2019

    Publisher: The Electrochemical Society

    DOI： 10.1149/2.0331902jes 　

    ISSN： 1945-7111 0013-4651

  7. Review—Polyaniline-Based Hydrogenochromic Sensor and Its Application for Visualizing Hydrogen Entry into Metals and Microstructure-Dependent Hydrogen Diffusion Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    MATERIALS TRANSACTIONS　2025/07

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.mt-maw2025001 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  8. An Irreversible Hydrogenochromic Sensor Applicable to Corrosion Environments with High Sensitivity and High Spatial Resolution International-journal International-coauthorship Peer-reviewed

    Zhenting Wang, Saya Ajito, Yongxin Wang, Motomichi Koyama, Eiji Akiyama, Hiroshi Kakinuma

    npj Materials Degradation　9　(78)　2025/07

    DOI： 10.1038/s41529-025-00630-6 　

  9. Stability of electrochemical hydrogen charging in NaCl aqueous solution containing NH4SCN: Effect of changes in solution chemistry Peer-reviewed

    Saya Ajito, Yusuke Kabasawa, Hiroshi Kakinuma, Motomichi Koyama, Eiji Akiyama

    Corrosion Science　2025/06

    DOI： 10.1016/j.corsci.2025.112843 　

  10. Hydrogen Effects on Hall–Petch Coefficient and Fracture Strength in Pure Ni and Ni-20Cr Alloy: A Macroscopic Insight of the Hydrogen Embrittlement Mechanism Peer-reviewed

    Motomichi Koyama, Kota Tomatsu, Hiroshi Kakinuma, Saya Ajito, Eiji Akiyama

    Metallurgical and Materials Transactions A　2025/01/23

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1007/s11661-025-07688-6 　

    ISSN： 1073-5623

    eISSN： 1543-1940

    More details Close

    Abstract The effects of Cr and H on the yield and fracture strengths in pure Ni and Ni-20Cr alloy were investigated based on the Hall–Petch relationship. The Hall–Petch coefficient, which depends on the dislocation pile-up length and slip transfer resistance at the grain boundaries, drastically increased by 20 pct Cr addition and unchanged by gaseous hydrogen charging at 80 MPa. These results indicate that Cr increased the intergranular stress concentration associated with dislocation pile-up, whereas H did not.

  11. Grain boundary nanochemistry and intergranular corrosion of Fe-0.01wt.%P alloy: Roles of elemental segregations and misorientation Peer-reviewed

    Saya Ajito, Kazuya Tojima, Hiroshi Kakinuma, Kohei Ikeda, Yongjie Zhang, Tomohiko Hojo, Goro Miyamoto, Motomichi Koyama, Tadashi Furuhara, Eiji Akiyama

    Acta Materialia　120577-120577　2024/11

    Publisher: Elsevier BV

    DOI： 10.1016/j.actamat.2024.120577 　

    ISSN： 1359-6454

  12. Visualization of Microscopic Hydrogen Diffusion in Polycrystalline Pure Ni Using an Ir Complex International-journal Peer-reviewed

    Saya Ajito, Hiroshi Kakinuma, Motomichi Koyama, Eiji Akiyama

    MATERIALS TRANSACTIONS　2024/09

    Publisher: Japan Institute of Metals

    DOI： 10.2320/matertrans.mt-c2024008 　

    ISSN： 1345-9678

    eISSN： 1347-5320

  13. Visualization of Microscopic Hydrogen Diffusion in Polycrystalline Pure Ni Using an Ir Complex Peer-reviewed

    Saya Ajito, Hiroshi Kakinuma, Motomichi Koyama, Eiji Akiyama

    Zairyo-to-Kankyo　73　(8)　194-199　2024/08/10

    Publisher: Japan Society of Corrosion Engineering

    DOI： 10.3323/jcorr.73.194 　

    ISSN： 0917-0480

    eISSN： 1881-9664

  14. Techniques for Visualizing Hydrogen Diffusion in Metals Using Polyaniline Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    Materia Japan　63　(6)　381-389　2024/06/01

    Publisher: Japan Institute of Metals

    DOI： 10.2320/materia.63.381 　

    ISSN： 1340-2625

    eISSN： 1884-5843

  15. Microscopic visualization of hydrogen diffusion in UNS S32750 super duplex stainless steel: Roles of crystal structure and grain size International-journal Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    International Journal of Hydrogen Energy　59　866-873　2024/03/15

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijhydene.2024.02.069 　

    ISSN： 0360-3199

  16. Effect of Stretch-forming on Hydrogen Diffusion Behavior in High-strength Steel Sheet Peer-reviewed

    Hayato Nishimura, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Ken-ichi Fujita, Yuki Shibayama, Hiroshi Kakinuma, Eiji Akiyama

    ISIJ International　64　(4)　637-644　2023/06

    Publisher: Iron and Steel Institute of Japan

    DOI： 10.2355/isijinternational.isijint-2023-149 　

    ISSN： 0915-1559

    eISSN： 1347-5460

  17. 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　(2)　021503　2023/02/01

    Publisher: The Electrochemical Society

    DOI： 10.1149/1945-7111/acb6ba 　

    ISSN： 0013-4651

    eISSN： 1945-7111

  18. Mechanical loading effect on the hydrogen uptake of tempered martensite steel: Elastic strain effect vs. plastic strain effect International-journal Peer-reviewed

    Yota Masuda, Motomichi Koyama, Hiroshi Kakinuma, Eiji Akiyama

    Materials Science and Engineering: A　862　(18)　144486-144486　2023/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.msea.2022.144486 　

    ISSN： 0921-5093

  19. In situ 2D mapping of hydrogen entry into an Fe sheet under a droplet of NaCl solution using a hydrogenochromic sensor International-journal Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama

    International Journal of Hydrogen Energy　47　(90)　38468-38476　2022/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.ijhydene.2022.09.006 　

    ISSN： 0360-3199

  20. Simultaneous observations of the corrosion behavior of an Fe sheet and the associated hydrogen distribution therein employing a hydrogenochromic sensor International-journal Peer-reviewed

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama

    Corrosion Science　206　110534-110534　2022/09

    Publisher: Elsevier BV

    DOI： 10.1016/j.corsci.2022.110534 　

    ISSN： 0010-938X

  21. Effect of Stretch-forming on Hydrogen Diffusion Behavior in High-strength Steel Sheet Peer-reviewed

    Nishimura, H., Ajito, S., Hojo, T., Koyama, M., Fujita, K.-I., Shibayama, Y., Kakinuma, H., Akiyama, E.

    Tetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan　108　(5)　2022/02

    Publisher: Iron and Steel Institute of Japan

    DOI： 10.2355/TETSUTOHAGANE.TETSU-2021-096 　

    ISSN： 0021-1575

  22. Morphological Change and Open-circuit Potential of Single Metastable Pit on AA1050 Aluminum in NaCl Solution International-journal Peer-reviewed

    Kakinuma, H., Muto, I., Oya, Y., Momii, T., Sugawara, Y., Hara, N.

    Journal of the Electrochemical Society　168　(2)　021504-021504　2021/02/01

    Publisher: The Electrochemical Society

    DOI： 10.1149/1945-7111/abdee9 　

    ISSN： 1945-7111 0013-4651

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Misc. 4

  1. 導電性高分子を用いた次世代型水素可視化技術の開発 金属中を拡散する水素のリアルタイム観察に成功

    柿沼洋

    クリーンエネルギー　2024/04

  2. 北京科技大学への留学

    Hiroshi KAKINUMA

    Vacuum and Surface Science　66　(5)　308-309　2023/05/10

    Publisher: Surface Science Society Japan

    DOI： 10.1380/vss.66.308 　

    ISSN： 2433-5835 2433-5843

    eISSN： 2433-5843

  3. Studies on localized corrosion at intermetallic particles on Al alloys

    Hiroshi Kakinuma, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

    Journal of Japan Institute of Light Metals　70　(7)　2020/07

  4. 腐食防食学を学んで

    Materia Japan　59　(6)　328-328　2020/06/01

    Publisher: Japan Institute of Metals

    DOI： 10.2320/materia.59.328 　

    ISSN： 1340-2625

    eISSN： 1884-5843

Presentations 37

  1. Development of hydrogen sensors using conductive polymers and applications for analyzing hydrogen entry and diffusion mechanisms Invited

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    The year 2025 annual spring (the 176th) meeting of JIMM　2025/03/08

  2. Simultaneous observations of hydrogen entry and pH distribution in a NaCl droplet on an Fe sheet using polyaniline International-presentation

    Hiroshi Kakinuma, Sachiko Hiromoto, Tomohiko Hojo, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    EUROCORR2024　2024/09/04

  3. Development of hydrogen video imaging system for analyzing hydrogen diffusion behaviors in polycrystalline metals International-presentation

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama

    European Conference on Fracture 2024　2024/08/28

  4. An ultrasensitive hydrogenochromic sensor for visualizing hydrogen distribution in pure Fe under corrosion conditions International-presentation

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama

    EUROCORR 2022　2022/08/29

  5. In situ microscopic observation of pit initiation and repassivation of AA1050 aluminum under open circuit conditions International-presentation

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

    ICAA17 (17th International Conference on Aluminum Alloys)

  6. In situ Microscopic Observation of Pitting Corrosion Behavior of A1050-O International-presentation

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

    234th ECS and SMEQ Joint International Meeting

  7. Imaging hydrogen entry behavior into Zn-coated steels in NaCl solutions

    The 189th ISIJ Spring Meeting　2025/03/09

  8. 導電性ポリマーを用いた金属中の微視的水素拡散挙動の可視化

    柿沼 洋

    日本MRS 水素科学技術連携研究会　2025/07/16

  9. 大気腐食環境下におけるFe板への水素侵入挙動に及ぼすpHの影響

    柿沼洋, 廣本祥子, 北條智彦, 味戸沙耶, 小山元道, 秋山英二

    第71回材料と環境討論会　2024/11

  10. Real-time 2D mapping of hydrogen entry and pH distribution inside a NaCl droplet on an Fe sheet using a hydrogenochromic sensor International-presentation

    Hiroshi Kakinuma, Sachiko Hiromoto, Tomohiko Hojo, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    PRiME 2024　2024/10/10

  11. Effect of pH on local hydrogen entry behavior under NaCl droplet on Fe sheet International-presentation

    Hiroshi Kakinuma, Saya Ajito, Motomochi Koyama, Eiji Akiyama

    The 188th ISIJ Meeting　2024/09/18

  12. Filming microscopic hydrogen diffusion behaviors in metals using an ultrasensitive hydrogenochromic sensor International-presentation

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    The 7th Symposium for the Core Research Clusters for Materials Science and Spintronics and the 6th Symposium on International Joint Graduate Program in Materials Science and Spintronics　2023/11/28

  13. Filming microstructure-dependent hydrogen diffusion in polycrystalline metals using a hydrogen video imaging system International-presentation

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    Summit of Materials Science 2023 and GIMRT User Meeting 2023　2023/11/22

  14. Hydrogen video imaging for visualizing microstructure-dependent hydrogen diffusion in polycrystalline metals International-presentation

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama

    244th ECS Meeting　2023/10/10

  15. Development of a visualization technique for hydrogen in metals using a conductive polymer

    Hiroshi Kakinuma, Saya Ajito, Motomichi Koyama, Eiji Akiyama

    2023/09/20

  16. Real-time hydrogen visualization system with high spatial and temporal resolutions: Imaging the preferential hydrogen permeation at grain boundaries of pure Ni International-presentation

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Eiji Akiyama

    EUROCORR 2023　2023/08/30

  17. 導電性高分子による金属材料中の水素分布の可視化技術について Invited

    Hiroshi Kakinuma

    2022/10/31

  18. In situ observation of hydrogen distribution under a droplet of NaCl solution on pure Fe and analysis of the hydrogen entry behavior in correlation with pH

    2022/09/21

  19. In situ visualization of the hydrogen distribution in an Fe sheet under corrosion conditions using polyaniline International-presentation

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama

    242nd ECS Meeting　2022/09/11

  20. 導電性高分子を用いた局所侵入水素の可視化技術について

    柿沼洋

    日本鉄鋼協会 フォーラム「鋼材腐食水素侵入に関する評価技術の新展開」第5回全体会議　2022/05/18

  21. Al-Fe合金表面における孔食発生挙動のin situ観察

    柿沼 洋, 武藤 泉, 大谷 良行, 籾井隆宏, 菅原 優, 原 信義

    日本金属学会 2020年春期第166回講演大会　2022/03/18

  22. Development of a hydrogenochromic sensor using a conductive polymer and analysis on the hydrogen diffusion behavior in metals

    Hiroshi Kakinuma, Saya Ajito, Tomohiko Hojo, Motomichi Koyama, Sachiko Hiromoto, Eiji Akiyama

    2022/03/17

  23. 導電性高分子を用いた水素可視化技術の開発と腐食環境における純Feへの水素侵入挙動の解析

    柿沼洋, 味戸沙耶, 北條智彦, 小山元道, 廣本祥子, 秋山英二

    腐食防食学会 東北支部講演大会　2021/11/05

  24. 水素のイメージングによる純Feへの水素侵入挙動の解析

    柿沼洋, 味戸沙耶, 北條智彦, 小山元道, 廣本祥子, 秋山英二

    腐食防食学会 第68回材料と環境討論会　2021/10/28

  25. Effect of pH change on the electrochemical behavior of intermetallic particles in AA1050 aluminum International-presentation

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

    240th ECS Meeting

  26. 工業用純アルミニウムの溶解形態と自然浸漬電位の同時解析

    柿沼 洋, 武藤 泉, 大谷 良行, 籾井 隆宏, 菅原 優, 原 信義

    日本金属学会 2021年春期第168回講演大会　2021/03/18

  27. In situ observation of pitting corrosion on AA1050 under open circuit conditions International-presentation

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

    PRiME 2020 (ECS, ECSJ, & KECS Joint Meeting)

  28. NaCl水溶液におけるAA1050の孔食発生挙動のin situ観察

    柿沼 洋, 武藤 泉, 大谷良行, 籾井隆宏, 菅原 優, 原 信義

    腐食防食学会 材料と環境2020

  29. Analysis of Local dissolution Behavior of Intermetallic Particles on Chromate-Treated AA1050 Using Micro-Electrochemical System International-presentation

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

    236th ECS Meeting

  30. In situ microscopic study of the initiation of the crystallographic pitting corrosion on 1050 aluminum International-presentation

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

    EUROCORR 2019

  31. マイクロ電気化学システムによるAA1050-Oの溶解挙動のin situ観察と孔食発生に及ぼすpHの影響解析

    柿沼 洋, 武藤 泉, 菅原 優, 大谷良行, 京 良彦, 原 信義

    日本金属学会 2019年春期第164回講演大会　2019/03/21

  32. In situ microscopic observation of dissolution behavior of Al-Fe alloy using micro electrochemical measurement

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

    2018/05/26

  33. マイクロ電気化学システムによるAl-Fe合金の孔食発生挙動のin situ観察と溶解挙動に与える晶出物組成の影響

    柿沼 洋, 武藤 泉, 菅原 優, 大谷良行, 京 良彦, 原 信義

    腐食防食学会 材料と環境2018　2018/05/23

  34. In situ microscope observation of pitting corrosion on Al-Mg alloy using micro electrochemical measurement and effect of pH on dissolution behavior International-presentation

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

    232nd ECS Meeting

  35. Al-Mg合金の孔食発生挙動のin situ観察と溶解挙動に与えるpH緩衝作用の影響

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

    2017/09/07

  36. マイクロ電気化学システムによるAl-Mg合金の孔食発生挙動のin situ観察と溶解挙動に与えるpHの影響

    柿沼洋, 武藤泉, 菅原優, 大谷良行, 京良彦, 原信義

    腐食防食学会 材料と環境2017　2017/05/25

  37. 導電性ポリマーによる電位分布イメージングプレートの作製と腐食現象解析への適用

    柿沼洋, 武藤泉, 菅原優, 原信義

    日本鉄鋼協会第172回秋季講演大会　2016/09/22

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Industrial Property Rights 3

  1. FILM SENSOR AND HYDROGEN DETECTION SYSTEM

    Hiroshi Kakinuma, Eiji Akiyama, Saya Ajito, Motomichi Koyama, Tomohiko Hojo

    Property Type: Patent

  2. FILM SENSOR AND HYDROGEN DETECTION SYSTEM

    Property Type: Patent

  3. 金属材料の電位解析用イメージングデバイス

    Hiroshi Kakinuma, Izumi Muto, Yu Sugawara, Nobuyoshi Hara

    Property Type: Patent

Research Projects 6

  1. 金属内部を再現した3次元空間における水素拡散シミュレーション

    Hiroshi Kakinuma

    Offer Organization: Japan Science and Technology Agency

    Institution: National Institute for Materials Research

    2025/04 - 2030/03

  2. 鋼の腐食に伴う水素侵入の微視的機構解明と革新的水素侵入抑制技術の開発

    柿沼 洋

    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 - 2028/03

  3. ひずみ分布を付与した鋼内部の水素分布解明と水素脆化抑制指針の提案

    Hiroshi Kakinuma

    Offer Organization: The Amada Foundation

    2024/10 - 2027/03

  4. すき間内における鉄鋼材料への水素侵入挙動の実時間可視化と水素侵入抑制技術の開発

    Hiroshi Kakinuma

    Offer Organization: The Iron and Steel Institute Japan

    2024/04 - 2026/03

  5. 超高感度水素可視化システムによる腐食環境における金属材料への水素侵入経路の解明

    柿沼 洋

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 若手研究

    Category: 若手研究

    Institution: 東北大学

    2023/04 - 2025/03

  6. 新規高耐食化技術の開発による次世代型高強度高耐食性アルミニウム合金の創製

    柿沼 洋

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 特別研究員奨励費

    Category: 特別研究員奨励費

    Institution: 東北大学

    2019/04 - 2021/03

    More details Close

    インヒビターとして金属イオンを含有する水溶液を用いて化成処理を行い、アルミニウム合金の高耐食化に成功した。化成処理を施したアルミニウム合金は優れた耐食性を示したが、高温かつ高塩化物イオン濃度等の過酷な腐食環境においては、一部の金属間化合物を起点として局部腐食を生じることが明らかになった。そこで、腐食起点となる金属間化合物を化成処理中に溶解除去することで、腐食起点を無害化する技術の開発に取り組んだ。その結果、金属イオンのインヒビターを含有する酸性水溶液を用いて化成処理を行うことで、腐食起点となる金属間化合物を化成処理中に除去できることを見出した。また、化成処理に先立ち、アルカリ水溶液を用いた前処理を施すと、短時間で効率的に金属間化合物がアルミニウム表面から除去されることが分かった。さらに、従来の金属イオンインヒビターよりも環境負荷の小さいインヒビターを用いて、金属間化合物を溶解除去する技術の開発に取り組んだ。アルカリ水溶液による前処理を行い、その後モリブデン酸などのインヒビターを含有する酸性水溶液で化成処理を行うことで、従来の化成処理法よりも環境負荷を低減しながら優れた耐食性を付与できることを発見した。 本研究では、腐食起点を化成処理中に溶解除去するという新しい発想を用いてアルミニウム合金の高耐食化に成功した。本研究で開発した化成処理法を用いることで、アルミニウム合金の機械的特性を低下させずに、高温かつ高塩化物イオン濃度の環境でも優れた耐食性を付与することができる。また、従来よりも環境負荷の小さい化成処理溶液を用いてアルミニウム合金を高耐食化することにも成功した。さらに、本研究で開発した化成処理法による高耐食化機構を明らかにし、アルミニウム合金を高耐食化する化成処理の新規開発指針を提案した。

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Media Coverage 12

  1. Tohoku University's Institute for Materials Research develops new video imaging technology to observe the behavior of hydrogen in metals

    Japan Science and Technology Agency (JST)　Science Japan　Physics & Materials

    2024/01/17

    Type: Internet

  2. Visualizing hydrogen diffusion in real time

    John Wiley & Sons　Wiley Analytical Science

    2023/12/28

    Type: Internet

  3. 日本东北大学金属材料研究所开发出氢在金属中运动状态的可视化新技术

    国立研究開発法人科学技術振興機構（JST）　客観日本　化学材料

    2023/12/20

    Type: Internet

  4. 金属中の水素の振る舞い 動画撮影の新技術開発 東北大金研

    科学新聞社　科学新聞

    2023/12/08

    Type: Newspaper, magazine

  5. 水素の拡散経路可視化 金属にポリアニリン成膜 東北大

    日刊工業新聞社　日刊工業新聞

    2023/11/29

    Type: Newspaper, magazine

  6. Filming the Microscopic Flow of Hydrogen Atoms in a Metal

    Asia Research News

    2023/12/19

    Type: Internet

  7. 金属中の水素原子の流れを可視化し、動画撮影できる新手法を開発

    ITmedia Inc.　MONOist

    2023/12/19

    Type: Internet

  8. 東北大 金属中の水素原子の振る舞い可視化 リアルタイムで広域に可視化

    化学工業日報社　化学工業日報

    2023/12/04

    Type: Newspaper, magazine

  9. 東北大、金属中の水素原子の振る舞い可視化

    化学工業日報社　化学工業日報 電子版

    2023/12/04

    Type: Internet

  10. 「水素原子の流れ」を動画として撮影 東北大助教らが技術を世界初開発

    BUNKYO DIGITAL

    2023/12/01

    Type: Internet

  11. 東北大、水素の拡散経路可視化 金属にポリアニリン成膜

    NIKKAN KOGYO SHIMBUN,LTD.　NIKKAN KOGYO SHIMBUN ONLINE EDITION

    2023/11/29

    Type: Internet

  12. 東北大、金属中の水素の流れを動画撮影する技術を開発

    Nikkei Inc.　The Nikkei Online Edition

    2023/11/27

    Type: Internet

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