| Budget Amount *help |
¥24,830,000 (Direct Cost: ¥19,100,000、Indirect Cost: ¥5,730,000)
Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥7,150,000 (Direct Cost: ¥5,500,000、Indirect Cost: ¥1,650,000)
Fiscal Year 2013: ¥14,560,000 (Direct Cost: ¥11,200,000、Indirect Cost: ¥3,360,000)
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| Outline of Final Research Achievements |
The aim of this study was to elucidate a mechanism of localized corrosion on zirconium (Zr) in chloride-containing environment. The experiments were performed by using special electrochemical measurement system that enables to measure the corrosion behavior within the micrometer-scale area. As a result, it was found that the pitting corrosion was initiated on the inclusions derived from the impurity elements in Zr substrate. However, the concentration of the impurities were extremely small so that the inclusion size were tiny and they were rarely exposed to the surface. In other words, Zr has potentially excellent corrosion resistance even in chloride-containing environments. The surface modification technique which can improve the localized corrosion resistance of Zr was developed based on the above findings. It must be a great achievement to enhance the usage of Zr not only in medical field but also general industrial one.
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