Abstract
SUMMARYThe electrochemical processes during the electrodeposition of silver from alkaline thiocyanate-cyanide electrolytes are investigated by cyclic voltammetry as a function of silver concentration and potential sweep rate.Two cathodic reactions during the electrodeposition of silver and two anodic ones during its dissolution have been established. The ranges of sweep rates and silver concentrations in the electrolyte within which the processes proceed with diffusion control are determined. The investigations show the presence of chemical reactions along with the electrochemical silver deposition process.A potential region of formation of a layer of insoluble compounds, as well as a region of dissolution and passivation of the silver surface are determined. The passive oxide layers formed are reduced during the next cathodic scan.
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