Medium to high strength 6xxx Al alloys are increasingly used for automotive and aerospace applications. Such strength levels are achieved with alloying Cu additions. However, with increased Cu concentration levels, the 6xxx alloys may become susceptible to intergranular corrosion (IGC). The role of Cu on the IGC behaviour of 6xxx alloys was investigated using model AlMgSi(Cu) alloys with low, medium and relatively high Cu concentration levels.
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