Abstract
SUMMARYThe electrochemical processes during the deposition and dissolution of bismuth in alkaline thiocyanate-tartrate electrolytes as a function of bismuth concentration in the electrolyte and potential sweep rate are investigated by cyclic voltammetric techniques.Two cathodic reactions are observed during the deposition of bismuth with a potential difference of 0.5 V. which are probably related to the deposition of this metal from complexes with different stability. It is established that the deposition of bismuth is preceded by chemical reactions.The electrode processes are studied on gold, platinum and silver substrates. The differences in the cyclic voltammetric curves resulting both from the formation and reduction of oxide films, as well as from partial dissolution of the silver substrate are discussed.The deposition and dissolution of bismuth in the investigated electrolytes occurs within the potential region where silver is also deposited or dissolved in the same electrolytes. This fact offers the possibility to use the electrolytes for the deposition and investigation of Ag-Bi alloy coatings of the two metals.
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