水素マイクロプリント法による高濃度Ａｌ‐Ｍｇ合金における環境水素の挙動解析
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High-magnesium Al–Mg alloys are known to be sensitive to the stress corrosion cracking (SCC) involving environmental hydrogen, invading from the corrosive environment. In this study, the behavior of the environmental hydrogen in solution-treated Al–6 mass% and 8 mass%Mg binary alloy sheets stretched by 10% during exposure to 3.5%NaCl aqua solution has been investigated by means of hydrogen microprint technique (HMPT). Microprint image is observed on one surface while the other exposed to the corrosive solution. In both the alloys, the silver particles corresponding to the sites where hydrogen atoms are emitted from the inside of the alloys are observed on many slip lines and some grain boundaries. It is shown that the hydrogen atoms are transported with moving dislocations in the alloys. The environmental hydrogen can be generated because of chemical reaction of water in the solution with the bare aluminum introduced by the plastic deformation, and then included in the alloys.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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