Electrodeposition of Nanocrystalline Ni-Mo Alloys from Alkaline Glycinate Solutions

Abstract

The induced electrodeposition of nanocrystalline Ni-Mo alloys was investigated using two different molar ratios of Ni:Mo in sodium glycinate solution at pH 9.3. The chemical nature of the Ni2+ and MoO42- in alkaline glycinate solution was studied using UV-Vis absorption spectroscopy. The composition of the coating layer was determined using EDX. The crystallinity of electrodeposits was examined using XRD, whereas, the morphology and topography were investigated using SEM and AFM, respectively. The corrosion resistance of Ni-Mo alloys compared to pure Ni was studied in 3.5 % NaCl solution using potentiodynamic polarization and electrochemical impedance techniques. Ni- Mo alloy electrodeposited from the solution containing [MoO42-]/[Ni2+] molar ratio of 0.2 show higher corrosion resistance compared to plating solutions of molar ratio 0.1 and pure Ni.