Electrodeposition of Ni–W/Al2O3 Nano-Composites and the Influence of Al2O3 Incorporation on Mechanical and Corrosion Resistance Behaviours

Ni–W/Al2O3 nano-composites were electrodeposited on mild steel substrate for mechanical and corrosion resistance applications. This study focused on the preparation of Ni–W/Al2O3 nano-composite coating with various quantity of Al2O3 incorporations. The addition of Al2O3 in the electrolytes were varied from 1–10 g/L in electrolytes and the Al2O3 incorporation in Ni–W/Al2O3 nano-composite coatings were obtained from 1.82 to 13.86 wt.%. The incorporation of Al2O3 in Ni–W alloy matrix influenced the grain size, surface morphology and structural properties were observed. The distributions of Al2O3 particle in alloy matrix were confirmed using electron microscopy (FESEM and TEM) and EDAX mapping analysis. The crystal structure informations were studied using X-ray diffraction method and it confirms that the deposits having cubic crystal structure. The better corrosion rate (0.87 mpy) and microhardness (965 HV) properties were obtained for the Ni–W/Al2O3 nano-composite coating with 13.86 wt.% of Al2O3 incorporations.