NICKEL-SILICON CARBIDE COMPOSITE COATINGS SYNTHESIZED THROUGH ELECTRODEPOSITION ROUTE

Abstract

Nickel silicon carbide composite coatings over copper substrate were synthesized using pulsed and direct current electrodeposition technique. The coatings were characterized using x-ray diffraction for crystal structure and grain size. Scanning electron microscopy investigations were conducted for determining surface morphology, reinforced particles and amount of SiC particles reinlbrced. The wear rate of coatings was studied using ball on disc technique. Vickers microhardness at coating surface was also measured and its value varies from 185± 5 to 440:. 5 VIfN. Eleetrodeposition were done by pulse current method at different frequency (10. 50, 1001 lz) and direct current, kept other parameters constant like temperature, p11. current density, duty cycle (for pc method) etc. Corrosion rate of composite coatings calculated from Tafel extrapolation and its value varies from 0.7779 to3.5990 iAJcm2 Measure the advanced mechanical properties at different Frequency and compare among them.