The effect of Cu content on susceptibility to intergranular corrosion of Al-Mg-Si

Electrochemical measurements showed the pitting potential of solution heat treated alloy to increase with Cu content. After precipitation heat treatment at 200 C for 60 min and for 180 min, pitting potential of Cu-containing alloys decreased to -720 to -730 mV (vs. SCE), accompanying intergranular c...

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Bibliographic Details
Published inKeikinzoku Vol. 47; no. 5; pp. 285 - 291
Main Authors Yamaguchi, Keitarou, Tohma, Ken
Format Journal Article
LanguageJapanese
Published 01.05.1997
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Summary:Electrochemical measurements showed the pitting potential of solution heat treated alloy to increase with Cu content. After precipitation heat treatment at 200 C for 60 min and for 180 min, pitting potential of Cu-containing alloys decreased to -720 to -730 mV (vs. SCE), accompanying intergranular corrosion. Dissolution potential of the Mg2Si compound was found to be -730 mV (vs. SCE), which agreed with the pitting potential of precipitation heat treated Al-Mg-Si-Cu alloys. Intergranular corrosion of Al-Mg-Si-Cu alloys was concluded to be caused by preferential dissolution of less noble Mg2Si phase at grain boundary. (Author)
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ISSN:0451-5994