| Budget Amount *help |
¥22,880,000 (Direct Cost: ¥17,600,000、Indirect Cost: ¥5,280,000)
Fiscal Year 2017: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2016: ¥11,570,000 (Direct Cost: ¥8,900,000、Indirect Cost: ¥2,670,000)
Fiscal Year 2015: ¥6,630,000 (Direct Cost: ¥5,100,000、Indirect Cost: ¥1,530,000)
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| Outline of Final Research Achievements |
We tried to stop the growth of localized corrosions for steels by controlling the oxygen reduction reaction, the hydrogen evolution reaction, and the solution chemistry on the steel surface. No effect of the additive elements such as Al and Ni on the oxygen reduction reaction and the hydrogen evolution reaction for Fe-18Cr alloy was shown. A nitrogen compound layer formed on a surface of iron specimen was possible to inhibit the hydrogen evolution reaction. In acidic solutions, sulfate ions suppressed the anodic dissolution of steel matrix for Type 316L stainless steel. Based on the result, we succeeded the inhibition of the growth of crevice corrosion for Type 316L stainless steel by the addition of sulfate ion.
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