Crevice Corrosion Behavior of 5083 and 6061 Aluminum Alloys

The crevice corrosion behavior of 5083 and 6061 aluminium alloys was investigated by electrochemical noise and in-situ measurement with microelectrode. The experimental results indicated that concerning the crevice corrosion process, 6061 alloy follows IR drop mechanism, while 5083 alloy follows critical solution composition theory. The corrosion of 5083 alloy was mainly uniform corrosion and transferred to severe localized corrosion with the increasing of crevice depth. But the 6061Alloy suffered from severe localized corrosion. The difference of corrosion behavior between 5083 and 6061 aluminium slloys might be attributed to the presence of different intermetallic phase for the two alloys.