Effect of Mg and Si Addition on the Intergranular Corrosion of Aluminum Alloy

In this study Al-Si-Mg alloy sheets containing various amounts of Si and Mg were subjected to an anodic electrolysis test, and the relationship between intergranular corrosion susceptibility and addition of Si and Mg in aluminum alloy was investigated. Generation of intergranular corrosion was determined by both composition of alloy and temperature of heat treatment and was considered to accelerate when Mg₂Si particles percipitated on grain boundary.