Effect of Rolling Deformation on Corrosion and Discharge Behavior of AZ91 Magnesium Alloy

The corrosion and discharge behaviors of AZ91 magnesium alloy after hot rolling with different deformations (0%, 20%, 30%, and 40%) are systematically studied in this article. The results indicate that AZ91 without rolling deformation (0% rolling deformation) possesses the most outstanding corrosion resistance; at high current densities (40, 50 mA cm(-2)), the discharge activity of AZ91 after hot rolling with 20% deformation is optimal, while 0% rolling deformation shows the most excellent discharge activity at low current densities (5, 10 mA cm(-2)). Combined with the observation results of microstructure, it demonstrates that the corrosion resistance and discharge activity of AZ91 are closely related to the fragmentation of the second phase, the distribution of the second phase at the grain boundary, and the increase of the grain boundary after hot rolling.