Study on preparation of Ni-P-SiC (C) composite coatings by electroless deposition

Selecting the low cost SiC and graphite C particles as additives, the composite coatings of Ni-P-SiC (C) were produced on carbon steel substrate by means of electroless deposition. The process, solution components, and properties of composite coatings were studied. Results show that the thicknesses of coatings on the substrate are uniform, and the SiC or/and graphite C particles are well-distributed in the coatings. The formation velocities of coatings are ideal. It indicates that the plating process proposed is reasonable. Compared with Ni-P coating, the wear resistance of Ni-P-SiC and Ni-P-C composite coatings are improved to some extent, while the Ni-P-SiC-C coating prepared by adding SiC and C particles to the solution at the same time displays the most excellent wear resistance.