| Budget Amount *help |
¥16,900,000 (Direct Cost: ¥13,000,000、Indirect Cost: ¥3,900,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2015: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥10,010,000 (Direct Cost: ¥7,700,000、Indirect Cost: ¥2,310,000)
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| Outline of Final Research Achievements |
Aiming at the development of corrosion-stress coupling analysis method, a new methodology to evaluate the effect of stress on electrochemical property was established. Although the coupling analysis code could not developed since the examination of experimental conditions required an excessive time, a method to evaluate the polarization curve of microscopically-damaged potion of oxide film by using a damage model. We measured the variation of polarization curve of the cast aluminum alloy by the effect of stress in sodium chloride solution, and found that the spontaneous potential decreased about 40 mV under the influence of stress. The casting skin has lower spontaneous potential than the polished surface, and easy to corrode by the effect of stress. Moreover, as a result of boundary-element electric field analysis on the damaged oxide film, we found that the damaged potion of oxide film has about 120 mV lower spontaneous potential than the intact potion.
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