| Project/Area Number |
25630288
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Composite materials/Surface and interface engineering
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| Research Institution | Hokkaido University |
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Principal Investigator |
FUSHIMI Koji 北海道大学, 工学(系)研究科(研究院), 准教授 (20271645)
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| Project Period (FY) |
2013-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2014: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2013: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
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| Keywords | 材料加工・処理 / 表面・界面物性 / 不働態 / 材料加工・処理処理 / 腐食防食 |
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| Outline of Final Research Achievements |
In order to identify the initiation site of local corrosion, a visualization method of passive film with an excellent time resolution was developed. A heterogeneous formation of passive film on titanium during potentiodynamic anodic polarization in sulfuric acid, depending on substrate crystallographic orientation, and an initiation process of local breakdown of passive film in the acid containing with bromide ions were successfully observed by using the developed method. Furthermore, an ultra-violet light irradiation during the anodic polarization resulted the thinning of anodic oxide film and heterogeneous degradation of the film. In the initial period, however, the irradiation led to increase in charge transfer resistance through the film and to improve the corrosion resistance.
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