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To improve the corrosion resistance of friction stir welded (FSW) joints,in situ shot-peening-assisted cold spray coating was applied to the surface of FSW joints.The microstructure and corrosion behavior of the coatings were investigated.The results showed that a dense coating was obtained by cold spraying technology.Moreover,the use of in situ shot-peening-assisted technology significantly reduced the porosity of the coating,which has a positive impact on the microstructure and the mechanical performance.Exfoliation corrosion tests showed that the coating affected positively on the corrosion resistance.On the coated surface,the craters caused by shot-peening particles were corroded in the form of exfoliation corrosion,while the exposed particles were corroded in the form of intercrystalline corrosion.This work provides a new approach to the corrosion protection of FSW joints.