Abstract
The cathodic reduction of gold from mixed sulfite-thiocarbamide electrolytes is studied as a function of the electrolyte composition. In the absence of thiocarbamide in the gold-plating sulfite solutions, gold is deposited at the cathode at high overpotentials. The equilibrium composition of the electrolyte is calculated at various ratios between the amounts of sulfite and thiocarbamide; it is shown that an addition of 10−5 to 0.5 M thiocarbamide does not change considerably the solution composition, and gold ions are present, predominantly, in the form of the complex with sulfite ions. However, an addition of thiocarbamide to the solution leads to a decrease in the overpotential of metal deposition by approximately 0.5 V. A possible mechanism of the catalytic effect of thiocarbamide on the cathodic reduction of gold from mixed sulfite-thiocarbamide electrolytes is proposed. It is shown that sulfite ions have a stabilizing effect on the decomposition of thiocarbamide in the alkaline solutions.
Similar content being viewed by others
References
Peshchevitskii, B.I. and Erenburg, A.M., Izv. Sib. Otd. Akad. Nauk SSSR, Ser.: Khim., 1970, no. 4, p. 83.
Green, T.A. and Roy, S., J. Electrochem. Soc., 2006, vol. 153, p. 157.
Horkans, J. and Romankiw, L.T., J. Electrochem. Soc., 1977, vol. 124, p. 1499.
Bor, P., Tomkyavichyus, G.A., and Yuodkazis, K.N., Trudy AN Lit.SSR, Ser. B., 1981, vol. 2, p. 11.
Chai, L., Okido, M., and Wei, W., Hydrometallurgy, 1999, vol. 53, p. 255.
Shevtsova, O.N., Zelinskii, A.G., and Bek, R.Yu., Russ. J. Electrochem., 2009, vol. 45, p. 818.
Zelinskii, A.G. and Bek, R.Yu., Elektrokhimiya, 1985, vol. 21, p. 66.
Bek, R.Yu. and Shevtsova, O.N., Russ. J. Electrochem, 2010, vol. 46, p. 581.
Jeffrey, M.J., Hydrometallurgy, 2001, vol. 60, p. 7.
Zhang, S. and Nicol, M.J., J. Appl. Electrochem., 2003, vol. 33, p. 767.
Aleksandrova, T.P., Ovchinnikova, S.N., Vais, A.A., and Bek, R.Yu., J. Anal. Chem., vol. 54, p. 646.
Sauerbrey, G., Z. Phys., 1959, vol. 155, p. 206.
Vatankhah, G., Lessard, J., Jerkiewicz, G., Zolfaghari, A., and Conway, B.E., Electrochim. Acta, 2003, vol. 48, p. 1613.
Mineev, G.G. and Panchenko, A.F., Rastvoriteli zolota i serebra v gidrometallurgii (Solvents of Gold and Silver in Hydrometallurgy), Moscow: Metallurgiya, 1994.
Bek, R.Yu., Shuraeva, L.I., Ovchinnikova, S.N., and Vais, A.A., Russ. J. Electrochem, 2007, vol. 43, p. 288.
Bek, R.Yu. and Lavrova, T.A., Izv. Sib. Otd. Akad. Nauk SSSR, Ser.: Khim., 1971, no. 4, p. 17.
Tataru, S., Rev. Roumaine De Chimie, 1968, vol. 13, p. 185.
Kazakov, V.P., Lapshin, A.I., and Peshchevitskii, B.I., Zh. Neorg. Khim., 1964, vol. 9, p. 1299.
Yatsimirskii, K.B. and Orlova, M.N., Zh. Neorg. Khim., 1960, vol. 5, p. 2184.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © R.Yu. Bek, O.N. Shevtsova, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 9, pp. 1103–1108.
Rights and permissions
About this article
Cite this article
Bek, R.Y., Shevtsova, O.N. Peculiarities of cathodic reduction of gold from sulfite-thiocarbamide electrolytes. Russ J Electrochem 47, 1029–1034 (2011). https://doi.org/10.1134/S1023193511090102
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S1023193511090102