Electrochemical Impedance Spectroscopy Study of Nickel‐Iron Deposition: I. Experimental Results

Results of an electrochemical impedance spectroscopy study of nickel‐iron codeposition are presented. Impedance spectra are influenced in a complicated manner by the applied current density, rotation speed, and concentration of ferrous ions. Spectra are particularly sensitive to current density and ferrous‐ion concentration. As a basis for comparison, an experimental and theoretical study of nickel deposition from an iron‐free bath is presented. It is found that it is the inductive loop of the impedance spectra that changes most dramatically in the presence of ferrous ions.