"IMPROVEMENT IN CORROSION RESISTANCE OF ELECTRODEPOSITED NI-CO ALLOY COATINGS"

Corrosive resistant nickel-cobalt (Ni-Co) layers were produced by electrodeposition method at constant current density of 15 mA cm' at room temperature with the addition of saccharin as an additive agent. These films were characterized by various methods such as X-ray diffraction (XRD), Scanning Electron Microscopy (SEM) and Electrochemical Impedance Study (EIS). The XRD study confirmed the formation of nickel-cobalt (Ni-Co) alloy with plane orientation along (111) plane with composition Ni:Co as 80:20 and 85:15 at.%. The SEM revealed that the substrate surface covered with colony of nanograms resulting in compact morphology. The EIS study indicated the improvement in the corrosion resistance of nickel-cobalt (Ni-Co) from 240 to 500 Ω cm2 .