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M. Ramaprakash,R. Nivethida,A. Muthukrishnan,A. Jerom Samraj,M. G. Neelavannan,N. Rajasekaran The Korean Electrochemical Society 2023 Journal of electrochemical science and technology Vol.14 No.4
Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composites were electrodeposited on mild steel substrate for mechanical and corrosion resistance applications. This study focused on the preparation of Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composite coating with various quantity of Al<sub>2</sub>O<sub>3</sub> incorporations. The addition of Al<sub>2</sub>O<sub>3</sub> in the electrolytes were varied from 1-10 g/L in electrolytes and the Al<sub>2</sub>O<sub>3</sub> incorporation in Ni-W/Al<sub>2</sub>O<sub>3</sub> nano-composite coatings were obtained from 1.82 to 13.86 wt.%. The incorporation of Al<sub>2</sub>O<sub>3</sub> in Ni-W alloy matrix influenced the grain size, surface morphology and structural properties were observed. The distributions of Al<sub>2</sub>O<sub>3</sub> 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/Al<sub>2</sub>O<sub>3</sub> nano-composite coating with 13.86 wt.% of Al<sub>2</sub>O<sub>3</sub> incorporations.