Voltammetric analysis of phase composition of Zn-Ni alloy thin films electrodeposited under different electrolyze modes

Abstract

Zinc-nickel alloy films of 10–300 nm thickness were obtained by electrodeposition from a slightly alkaline polyligand ammonia-glycinate electrolyte under conditions of constant current, constant potential, and linear potential scan. The phase composition of the films was determined by the method of anodic voltammetry in an alkaline ammonia-glycinate solution. It is shown that the content of the most corrosion-resistant γ-phase in films increases with the increase in ratio of nickel and zinc ions concentration in the electrolyte, film thickness and current density above the limiting value. The parameters of contact exchange kinetics in the Zn-electrolyte system are determined. It is shown that the film of solid solution of zinc in nickel alloy with high adhesion to the substrate is deposited as a result of contact exchange. The contact exchange rate does not exceed 0.2 mA/cm2.