ZA20 coatings were prepared on the surface of AK63 magnesium alloys by cold spraying method. Microstructure of interface between cold sprayed coatings and magnesium alloy matrix was observed by OM （optical microscope）

EMP and EDX. Hardness

bonding strength and wear resistance

corrosion behavior of the samples before and after cold sprayed treatment were investigated. The results reveal that absence of diffusion between matrix alloy and coating and of defects in interface

such as crack

pore and separation

can be observed

showing desirable interface bonding. The hardness of the coating is approximately higher 3 times than that of the alloy substrate. In addition

wear resistance of the magnesium alloy after cold sprayed ZA20 coating is greatly superior to that of magnesium alloy matrix in condition of dry friction or oil lubrication. Self-erosion potential of cold sprayed samples （-0.26V） is far higher than that of magnesium alloy matrix（-1.62V）

leading to in the significant improvement of corrosion resistance.