Fabrication and characterization of Al–Zn–Cu composite coatings with different Cu contents by cold spraying

ABSTRACTThis work focus on the effect of different contents of Cu on microstructure and properties of Al–Zn composite coatings. The SEM and EDS were used to analyse the microstructure and composition of the coatings, and the deposition efficiency and porosity of the coating were calculated. The results show that the coatings have low porosity and uniform structure. The hardness, electrical conductivity and corrosion resistance of the coating were measured, and the results showed that the addition of Cu can improve the hardness, electrical conductivity and corrosion resistance of the coating but reduce the deposition efficiency of the powder.