7NO1 合金の応力腐食割れと腐食挙動の関係 : Al-Zn-Mg 系合金の応力腐食割れに関する研究(第 2 報)

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In the present paper the relationship between stress corrosion cracking (SCC) and corrosion behaviors of Al-Zn-Mg 7NO1 alloy in NaCl solutions was investigated metallurgically and electro chemically. For lower temperature (below 60℃)-and shorter time-aged (ie. cold aged) alloys, the susceptibilities to SCC and intergranular corrosion were in a good correlation, and the values of the observed activation energy of SCC and dissolution were equal approximately. The SCC is essentially caused by active-path corrosion of pre-existed anodic zone along grain boundaries. For higher temperature-and longer time-aged (ie. warm aged) alloys, the contribution of corrosion actions to SCC process was relatively small. The crack growth involved a mechanical rupture process. For high temperature (above 85℃)-and shorter time-aged alloys, the SCC was assisted by easy crack initiation due to highly selective exfoliation corrosion.
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