Technical conditions of Ni-P-(Ni/SiC)_p coatings

In order to solve the problems such as the poor compatibility between the Ni-P-(SiC)_p coating matrix metal bond and strengthening of the covalent bond, easy shedding of the enhanced particle and the deduction of the coating properties (SiC)_p was surface-modified to (Ni/SiC)_p by a simple electroless plating. Then (Ni/SiC)_p particles were incorporated into the Ni-P plating solution to prepare Ni-P-(Ni/SiC)_p electroless composite coatings. The experimental results show that; temperature, pH, stirring speed and adding amount of (Ni/SiC)_p have great influence on the deposition amount and deposition rate of Ni-P-(Ni/SiC)_p coating. The optimal experimental conditions are the temperature of 82-86°C, the pH range of 4.2-4.6, the stirring rate of 200 r/mim and the amount of particles of 10 g/L. SEM and EDS analyses show that Ni-P-(Ni/SiC)_p coating is uniform and dense, the deposition of Ni, P and Si is large. Comparisons of the Ni-P coatings and the Ni-P-(SiC)_p coatings by wear resistance experiment show that the Ni-P-(Ni/SiC)_p coatings have good wear resisting properties. The (Ni/SiC)_p achieved by surface modification can further improve the using performance of Ni-P-(SiC)_p coatings.