Abstract
A mechanism of joint electroreduction of nickel(II) and iron(II) ions is proposed and experimentally substantiated. The mechanism is based on the hypothesis that nickel and iron hydroxo complexes are discharged on common active sites formed as a result of electrochemical adsorption of nickel hydroxo complexes. The analysis of kinetic equations derived for partial current densities of the evolution of iron and nickel to form the alloy shows that the kinetics of these processes is determined by the concentration of ions of both types. It is shown that at the joint deposition of nickel and iron, the rate constant for iron(II) electroreduction exceeds the rate constant for nickel(II) electroreduction and this predetermines the enrichment of the resulting alloy with the more electronegative component.
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