Voltamperometry of selective dissolution of Ag-Au alloys under conditions of solid phase-liquid phase mass transfer

The problem of anodic kinetically reversible selective dissolution of a homogenous metal A-B alloy at comparable rates of the mass transfer of ions of the metal being dissolved (in the liquid phase) and atoms A (in the solid phase) is solved and the conditions for the occurrence of purely solid phase diffusion transport during potentiodynamic ionization are found. A comparison of the results of the numerical modeling of the voltamperometric process with the experimental data on the selective dissolution of Ag-Au alloys shows that an increase in the ionic concentration of silver, a decrease in the scan rate of the anodic potential, and a diminution in the atomic fraction of silver in the alloy favor the occurrence of the purely solid-phase diffusion mode of the transition of Ag to the solution.