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Influence of cobalt ions on the anodic oxidation of a lead alloy under conditions typical of copper electrowinning

Nguyen, T., Guresin, N., Nicol, M. and Atrens, A. (2008) Influence of cobalt ions on the anodic oxidation of a lead alloy under conditions typical of copper electrowinning. Journal of Applied Electrochemistry, 38 (2). pp. 215-224.

Link to Published Version: http://dx.doi.org/10.1007/s10800-007-9427-9
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Abstract

The influence of cobalt ions in the solution on the anodic oxidation of a commercial Pb–Ca–Sn alloy under conditions typical of copper electrowinning was studied using cyclic voltammograms and potential decay transients. The cobalt ions changed the structure, morphology and chemical composition of the surface film from a loose porous film to a thin dense film. This change of surface film is the cause for the decreased rate of oxidation for the lead anode in the presence of cobalt ions. The steady state potential of the alloy during anodic oxidation decreased with (i) increasing cobalt ion concentration, (ii) increasing rotation speed, (iii) increasing temperature, (iv) decreasing acid concentration and (v) decreasing current density. The steady state potentials were lower in the presence of cobalt ions. This decrease in the steady state potential may indicate that oxygen evolution is more rapid on the more compact film formed in the presence of cobalt ions. Alternatively, an additional pathway of oxidation may be provided by the cobalt ions.

Publication Type: Journal Article
Murdoch Affiliation: Parker Cooperative Research Centre for Integrated Hydrometallurgy Solutions
School of Chemical and Mathematical Science
Publisher: Kluwer Academic Publishers
Copyright: 2007 Springer Science+Business Media BV
URI: http://researchrepository.murdoch.edu.au/id/eprint/8936
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