Preparation of micron sic/ni-co-p composite coatings and influencing factors

Micron graded SiC/Ni-Co-P composite coating, as a substitute for Cr-plating was success-fully prepared on 9Cr2Mo steel by galvanostatic deposition. On this basis, the effect of bath composition on the macro-and micro-morphology, composition and microhardness of the coating was assessed through single factor experiments. The results show that the acquired SiC/Ni-Co-P composite coating presents hardness of 646.11 (HV); the SiC/Ni-Co-P composite coating incorporated with strongly electro-negative micron grade SiC particles has smoother surface with less microcracks but without pores, and the particle content is higher than that with electropositive and weak electric SiC particles. The process and interface behavior of the incorporated micro SiC particles in the coating by electrodeposition were in-vestigated, and the effect of surface treatment of micron SiC on the coating was also interpreted.