Corrosion resistance and tribological properties of NiCo-SiC nanocomposite coatings

NiCo-SiC nanocomposite coatings were electrodeposited on stainless steel. The cathodic polarization curves for the co-deposition of NiCo-SiC at different concentrations of SiC particulates in the plating bath were measured by Chi660B electrochemistry station. The microstructure of the nanocomposite coatings was characterized. The surface morphology and worn track of the coatings were analyzed. The results show that the addition of SiC nano-particles to the electrolyte causes the reduction potential of Ni-Co to shift towards larger negative. The morphology of the coating changes from needle-like to granular. The NiCo-SiC nanocomposite coatings have better corrosion resistance and tribological property than NiCo alloy coatings. Observation of the morphology of the worn surfaces indicates that the alloy coating is characterized by adhesion, sever scuffing and plastic deformation, while the nanocomposite coating is characterized by typical abrasive wear.