Effect of shot peening and ion implantation on friction corrosion properties of magnesium alloys
Aiming at the problem of poor friction and corrosion resistance of magnesium alloy,magnesium alloy AZ31 was treated by shot peening and ion implantation,and the effect of strengthening process on the friction and corrosion resistance of magnesium alloy was studied.The magnesium alloy samples after strengthening were tested and characterized by X-ray diffractometer,microhardness tester,friction and wear testing machine and electrochemical workstation.Magnesium alloy AZ31 was treated by shot peening and ion implantation,and the effect of strengthening process on the friction and corrosion resistance of magnesium alloy was studied.The magnesium alloy samples after strengthening were tested and characterized by X-ray diffractometer,microhardness tester,friction and wear testing machine and electrochemical workstation.The results show that the microhardness of magnesium alloy AZ31 after shot peening and ion injection is higher than that of magnesium alloy after polishing and shot peening,which is due to the appearance of new phase Mg3N2 after N ion injection.The friction and wear experiments show that the friction coefficient of the magnesium alloy treated by ion injection and shot peening is lower,and the wear amount of the magnesium alloy treated by ion injection and shot peening is nearly twice that of the polished alloy.The electrochemical results show that the self-corrosion potential increases to-1.13,and the self-corrosion current density decreases significantly,which is due to the new Mg3N2 phase formed on the alloy surface and the diffusion protection of supersaturated nitrogen,indicating that the combined process of ion implantation and shot peening is an effective means to further improve the friction corrosion resistance of magnesium alloys.
magnesium alloyshot blastingion implantationfriction and wearcorrosion property