[Introduction]Appropriate surface treatment of metal fittings used on transmission line is beneficial for extending their service lives and ensuring the safe operation of power system.[Method]The micromorphology,elemental composition,phase structure,corrosion resistance,and wear resistance of pure Zn,Zn-Ni alloy,and Zn-Ni-diamond composite coatings were compared by scanning electron microscopy (SEM),energy-dispersive spectroscopy (EDS),X-ray diffraction (XRD),electrochemical analysis,and friction and wear testing.[Result]Among the three kinds of coatings,Zn-Ni-diamond composite coating,which was mainly composed of γ-Ni5Zn21 phase and δ-Ni3Zn22 phase,was the smoothest and the most compact,and had the best corrosion and wear resistance.[Conclusion]Zn-Ni-diamond composite electrodeposition has a promising application prospect in the surface protection of metal fittings.
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