Author:
Ramaprakash M.,Nivethida R.,Muthukrishnan A.,Samraj A. Jerom,Neelavannan M. G.,Rajasekaran N.
Abstract
<p>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.</p>
Publisher
The Korean Electrochemical Society - English Journal