Heat treatment process of high-mg er-microalloyed aluminum alloy cold-rolled plates resistant to intergranular corrosion

Abstract

A heat treatment process of high-Mg Er-containing aluminum alloy cold-rolled plates resistant to intergranular corrosion is disclosed, which belongs to the field of non-ferrous metals. The mass percentage of each component of high-Mg Er-containing aluminum alloy heat-rolled plates is, respectively, 5.8%-6.8% of Mg, 0.4%-0.8% of Mn, 0.15%-0.25% of Er, 0.15%-0.25% of Zr, the unavoidable impurities content being less than 4%, the balance being Al. The alloy hot-rolled plates are cold-rolled until the final cold deformation being 75%-90% after the intermediate annealing; the aluminum alloy cold-rolled plates undergo a stabilization annealing at the annealing temperature of 235° C. to 245° C. for 3.5-4 hours, and then is cooled in air to room temperature. This process significantly improves the resistance to intergranular corrosion while it does not reduce the strength of the alloy significantly.