2024 Fiscal Year Final Research Report
Mitigation and promotion of hydrogen environment embrittlement by controlling electron density on material surface
| Project/Area Number |
22K18763
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| Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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| Allocation Type | Multi-year Fund |
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| Review Section |
Medium-sized Section 18:Mechanics of materials, production engineering, design engineering, and related fields
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| Research Institution | Kyushu Institute of Technology |
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Principal Investigator |
Komoda Ryosuke 九州工業大学, 大学院工学研究院, 准教授 (90801308)
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| Project Period (FY) |
2022-06-30 – 2025-03-31
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| Keywords | 水素脆化 / 水素侵入 / 電子密度 / 静電誘導 |
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| Outline of Final Research Achievements |
To induce hydrogen embrittlement (HE) in a hydrogen gas environment, electron transfer (catalytic action) between hydrogen molecules and the material surface is required. Therefore, if this electron transfer can be controlled, mitigation of hydrogen embrittlement becomes feasible.In this study, we attempted to control hydrogen embrittlement under hydrogen gas conditions by modulating the electron density at the material surface.
We developed a novel tensile testing apparatus capable of controlling surface electron density via an applied electric field under a hydrogen atmosphere. The specimen was placed between two electrodes, and surface electron density was adjusted through electrostatic induction. The maximum electric field strength was set to 1200 kV/m, and the hydrogen gas pressure was 1.0 MPa. SENT specimens were used.
The test results demonstrated that the application of an electric field, regardless of its polarity, effectively suppressed hydrogen embrittlement.
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| Free Research Field |
水素脆化
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| Academic Significance and Societal Importance of the Research Achievements |
本研研究によって，材料表面の電子密度が増加する場合も減少する場合も，水素脆化を抑制することを実験的に明らかにすることができた．この水素脆化の抑制効果を有効活用すれば，水素関連機器で生じる水素脆化を制御でき，機器の安全性の向上およびコスト低減に資することができる．
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