| Project/Area Number |
60550496
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属材料(含表面処理・腐食防食)
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| Research Institution | Hokkaido University |
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Principal Investigator |
SEO Masahiro Faculty of Engineering, Hokkaido University, Associate Prof., 工学部, 助教授 (20002016)
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| Project Period (FY) |
1985 – 1986
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| Project Status |
Completed (Fiscal Year 1986)
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| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1986: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1985: ¥1,700,000 (Direct Cost: ¥1,700,000)
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| Keywords | Corrosion in high temperature water / Iron-base Alloy / 不働態皮膜 |
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| Research Abstract |
The corrosion behavior of Fe-26Cr alloy in a high-temperature-boric borate solution was electrochemically investigated in a autoclave and furthermore, the surface characterization of the alloy was performed with simultaneous use of Auger electron spectroscopy and argon-ion sputter-etching. The potential region in which chromium component of the alloy stabilizes the passive film narrows with increasing solution temperature (22゜C-250゜C). The surface enrichment of chromium component for the alloy specimen anodically oxidized for 90 min at 200゜C in the solution has a maximum at the potential of natural immersion and then decreases with increasing the anodic potential.
The depth-composition profile of the passive film has revealed that an inner oxidation proceeds in the oxide film/substrate interface. It is expected that oxygen ions duffusing inwards through the outer oxide film react with the substrate alloy to form the inner oxide layer.
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