| Budget Amount *help |
¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2014: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2013: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Outline of Final Research Achievements |
Corrosion of alloy metal is a very important research target to determine their durable life and performance under various kinds of environment. The corrosion is very familiar to human being but the process of corrosion has not been understood in atomic dynamics very well. In this study, the corrosion process of gold-silver alloy metal was observed by transmission electron microscope and the mechanism of the corrosion process was partly understood. The larger alloy metal (over 13 nm) demonstrates same process with bulk alloy metals and the metal which is easy to dissolve was selectively dissolved. Conversely, the smaller alloy metal (0-10 nm) demonstrates no selective dissolution and both components were dissolved simultaneously. In this critical diameter of 10-13 nm, it is found that the balance of geometric potential of the alloy metal size and chemical potential difference between gold and silver control the dissolution mechanism.
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