Development of a high-strength surface coating with an excellent resistance to hydrogen embrittlement
| Project/Area Number |
24560102
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kyushu University |
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Principal Investigator |
YAMABE Junichiro 九州大学, 水素エネルギー国際研究センター, 准教授 (20532336)
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| Co-Investigator(Renkei-kenkyūsha) |
MATSUOKA Saburo 九州大学, 水素材料先端科学研究センター, 特任教授 (10354250)
STAYKOV Aleksandar 九州大学, カーボンニュートラルエネルギー国際研究所, 助教 (80613231)
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2012: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | 水素 / 皮膜 / 水素脆化 / 水素透過 / 第一原理計算 |
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| Outline of Final Research Achievements |
Cylindrical specimens (Type 304) with two- and three-layer aluminum-based coatings deposited by a special-blended molten aluminum alloy were exposed to high-pressure hydrogen; then, their hydrogen contents were determined by thermal desorption analysis. The two-layer coating consisted of alumina and Fe-Al layers, whereas the three-layer coating consisted of alumina, aluminum, and Fe-Al layers. The hydrogen-content measurements revealed that the three-layer coating had an excellent resistance to hydrogen entry, compared to the two-layer coating. The excellent resistance of the three-layer coating was attributed to the existence of the aluminum layer, not the alumina layer, which has a good resistance to hydrogen entry in low pressures. Analysis of local hydrogen concentrations by secondary ion mass spectroscopy demonstrated that the extremely low effective hydrogen diffusivity of the three-layer-coated specimen was attributed to hydrogen trapping at the interface of aluminum and Fe-Al.
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Report
(4 results)
Research Products
(9 results)
