A Novel Approach to Deposit Compositionally Modulated Zn-Ni Multilayer as a Replacement for Cadmium Coating

Abstract

Compositionally Modulated multilayer Zn-Ni deposits were electrodeposited from acidic electrolytes (pH=4.7) by using a potentiostatic sequence. The Zn and Ni composition in the alloy is tailored as a function of distance from the steel substrate. The kinetic parameters controlling the processes at the deposit electrolyte interface were estimated by using electrochemical corrosion techniques in 5% NaCl solution. Open Circuit Potential (OCP), Tafel Polarization (LP) and Electrochemical Impedance Spectroscopy (EIS) studies were used to characterize the deposits.