Ni-P/SiC Composite Coatings Obtained by Chemical Methods

Nickel can be deposited chemically from water solution on a solid support, under the action of a reduction agent like natrium hypophosphite. Thus, a Ni + deposition is obtained, with a content between 3 -25 %, depending on the solution pH. In this paper the possibility is studied of fabricating composite coatings, by including in the Ni + matrix SiC particles with average size of 3 during deposition. The weight percentage of disperse particles in the coating could be brought up to 10%, depending on the SiC concentration in solution, on its chemical composition and on the stirring conditions. A technological flux for deposition was established. Properties like corrosion or wear resistance were determined and found superior to those of normal coatings.