Abstract
In order to improve corrosion resistance of friction stir welds of Mg alloy, Al coatings were fabricated by cold spraying on Mg alloy substrate. The microstructure and microhardness of friction stir weld and coatings are investigated with optical microscope and hardness machine. The results indicate that Al coatings present a smooth surface, low porosity and well bonding with substrate. The grains size of friction stir welds increase as substrate speed decrease or powder feeder wheel speed increase, while the microhardness decrease since residual stress in coatings and substrate reduces. The experimental results demonstrate that Al coatings fabricated by cold spraying can provide potential protection for as cast friction stir welds of AZ31 Mg alloy.
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