Fe–Zn film stripping voltammetry: Theoretical and experimental study

The voltammetric dissolution of an iron–zinc alloy film, deposited potentiostatically from −0.2 to −1.4 V, was studied. Dissolution curves of the film at different sweep rates showed only one anodic peak, whose current density (jp) was higher than the divacancy current density, implying that Fe and Zn in the film dissolved simultaneously. Equations relating jp to sweep rate (vv) and peak potential (Ep) to vv, for the dissolution process of thick alloy film, were developed on the basis of Brainina's theory of pure metal layer dissolution. These equations were applied to the dissolution of Fe–Zn alloy film. The results obtained showed that the jp × vv and Ep × vv plots were linear, corroborating the equations developed based on Brainina's theory and indicating that this alloy dissolves as one metal.