Al-Mg合金の応力腐食割れの観察
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Stress corrosion cracking tests were carried out in 3.5% NaCl solution. In a normal stress corrosion test, hydrogen bubbles generated at grain boundaries after some period from a start of testing and cracks were visualized. Cracks propagated along the grain boundary with increasing the number and size of bubbles. As a corrosion reaction was activated by anodic current in an accelerated test, hydrogen bubbles generated earlier and larger, and generated also at grain boundaries where no crack nucleated and in the grains. The crack propagated at an average rate 0.1-3mm/hr, but the propagation was microscopically discontinuous and the maximum rate reached 10-50mm/hr. Dissolution models for the stress corrosion mechanism is unapplicable at least for Al-Mg alloys. The stress corrosion involves both corrosion and mechanical processes.
- 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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