Effect of Driving Gas Temperature on Microstructure and Properties of Cold Sprayed 6061 Aluminum Alloy Coating

6061 aluminum alloy coating was cold sprayed on ZM6 magnesium alloy substrate at four driving gas temperatures (350,400,450,500 ℃). The effects of driving gas temperature on the microstructure, hardness and corrosion resistance of the aluminum alloy coating were studied. The results show that with the increase of driving gas temperature, the deposition rate of 6061 aluminum alloy powder increased significantly, the hardness of coating slightly decreased, but the porosity decreased significantly, and the corrosion resistance of the coating increased significantly. When the driving gas temperature was 500 ℃, the comprehensive performance of the aluminum alloy coating was the best; the porosity was 0.23%, the hardness was 89.8 HV, and the corrosion resistance was significantly better than that of ZM6 magnesium alloy.