Abstract
The work is devoted to the study of the corrosion behavior of indium and modified bismuth-indium electrodes used in the electrochemical refining of indium. Corrosion diagrams for both electrodes in chloride and perchlorate electrolytes of different compositions have been obtained by varying the pH and temperature of the solution and the ionization rates of indium have been calculated. Rate of corrosion reaction of indium in chloride and perchlorate containing chloride solutions is higher than the rate in perchlorate solutions, due to the activating action of chloride ions and greater stability of chloride complexes of indium. The higher the pH of the solution, the higher the oxidation rate of indium is. It can be explained, apparently, by participation of hydroxyl ions in the formation of metal complexes with components in electrolyte, which leads to increase of their stability. Based on the corrosion diagrams of rough indium in electrolytes of different compositions by varying the temperature, the values of the activation energy of the studied process, indicating the diffusion nature of indium oxidation in chloride and perchlorate-containing chloride solutions and the kinetic nature of this reaction in perchlorate electrolytes. Analysis of values of activation energy of ionization of indium and modified bismuth-indium electrodes showed that depressant additive does not influence the nature of the rate-limiting step of the process.
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