Technology for and Properties of Electric Brush Plated Ni-P/nano-WC Composite Coatings

Ni-P/nano-WC composite coating was prepared using electric brush plating.The influence of WC content in plating bath on the content of WC in the composite coating was studied.The effect of WC content on the microhardness and crystal structure of the composite coating was investigated, and the corrosion resistance of the composite coating in 1 mol/L H2SO4, 1 mol/L HCl and 3% NaCl was researched.Moreover, the surface morphology of the composite coating was examined using a scanning electron microscope.Results showed that the Ni-P/nano-WC composite coating had comparable corrosion resistance and better wear-resistance as compared to electric brush plated Ni-P coatings.Besides, the Ni-P/nano-WC composite coating prepared from the plating bath containing 25 g/L WC had a microhardness of 918 HV.