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

Electrochemical measurements showed the results as follows. Pitting potential of solution heat treated alloy increased 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~−730 mV (vs. SCE), accompanying...

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Bibliographic Details
Published inJournal of Japan Institute of Light Metals Vol. 47; no. 5; pp. 285 - 291
Main Authors YAMAGUCHI, Keitarou, TOHMA, Ken
Format Journal Article
LanguageJapanese
English
Published Tokyo The Japan Institute of Light Metals 1997
Keikinzoku Gakkai, c/o Hibiya Asahi Seimeikan, Keikinzoku Kyokai
Subjects
Al–Mg–Si alloy
Cu content
electrochemical measurement
intergranular corrosion
Mg2Si compound
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Summary:Electrochemical measurements showed the results as follows. Pitting potential of solution heat treated alloy increased 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~−730 mV (vs. SCE), accompanying intergranular corrosion. Dissolution potential of 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.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0451-5994
1880-8018
DOI:10.2464/jilm.47.285