Corrosion Behavior of Pulse Electrodeposited Nanostructure Ni-SiC Composite Coatings

Ni-SiC nano-composite coatings with various contents of SiC were prepared by pulse electrodeposition from a modified Watts bath containing SiC nano-particles. The effect of SiC concentration, current density, duty cycle and pulse frequency on the corrosion behavior of the coatings was investigated by means of potentiodynamic polarization and Electrochemical Impedance Spectroscopy (EIS) methods. It has been found that the Ni-SiC composite coatings show better corrosion resistance in a 3.5% NaCl solution than pure nickel. The corrosion resistance of the coatings increases by increasing the amount of embedded SIC particles. This improvement can be attributed to the morphology and the crystallographic texture of the coatings.