Effect of Electric Pulse-Assisted Laser Shock Peening on the Microstructure and Corrosion Resistance of High-Purity Magnesium

This study adopted a new composite surface treatment method called electric pulse-assisted laser shock peening. High-purity magnesium was pretreated with electric pulse and then strengthened through laser shock peening. The effect of electric pulse-assisted laser shock peening on the microstructure and corrosion resistance of high-purity magnesium was studied. The corrosion resistance of high-purity magnesium was characterized by observation of surface corrosion morphology, energy spectrum component analysis, electrochemical test, and stress corrosion tensile test, and the change in microstructure was studied from the aspects of grain size and dislocation density. The change of microhardness was also studied. Results showed that the corrosion resistance of high-purity magnesium can be effectively improved by this surface treatment method through refining grains, thus increasing the dislocation density and forming a compact, complete, and deep hardened layer.