O. V. Grishenkova, A. V. Kosov, Yu. P. Zaikov, V. A. Isaev.
ABSTRACT
The approach to the mathematical description of the electrochemical formation and growth of binary alloy nuclei on an indifferent electrode under conditions of constant supersaturation (overpotential) was proposed, which considers the general flow of two types of depositing ions in the electrolyte bulk to the surface of hemispherical new phase nuclei. The concentration profile was averaged taking into account the mole fraction ratio of the components. Cases of instantaneous and progressive nucleation with diffusion-controlled growth were investigated. The overlap of the diffusion zones of the nuclei was analyzed in the framework of the Scharifker–Hills (SH) model. Equations were obtained for calculating the apparent diffusion coefficient of the depositing ions, the number density of nuclei, and the steady-state nucleation rate.
KEYWORDS
electrocrystallization, nucleation, growth, diffusion
DOI:10.31857/S0235010620030020