Superior corrosion and wear resistance of pulse plated Ni–W–B/SiC composite coatings

In the present work, Ni–W–B/SiC composite coatings have been produced under pulse current condition which in through the influence of SiC nanoparticles amount in the coatings were investigated (by changing the concentration of SiC in the plating bath from 0 to 12 g/l) were examined. It was found that initial inclusion of SiC nanoparticles into the plating bath (4 g/l SiC) leads to presence of SiC nanoparticles in the coatings. However, subsequent addition of SiC nanoparticles up to the 8 g/l results in lower SiC amounts in the deposits due to the agglomeration of the nanoparticles. The corrosion resistant of the coating increases from 20.406 to 33.360 kΩ cm2 by adding 4 g/l SiC to the plating electrolyte and wear weight loss of the coating is decreases from 0.410 to 0.303 mg/cm2 respectively, which reveals enhanced electrochemical and tribological behavior. It seems that dense deposit with higher amounts and uniform distribution of SiC particles in the above composite coating is the main reason for improving corrosion and wear resistance. 1.The incorporation of SiC particles in the Ni–W–B matrix up to 4 g/l in the bath, improve coating's properties.2.The reduction of the matrix active surface area in the presence of SiC particles increases corrosion resistance.3.SiC particles reduce the surface friction coefficient and hence increases wear resistance.4.Beyond 4 g/l SiC concentration in the bath, due to the particles agglomeration, corrosion and wear resistance decreases.