Effect of cobalt added to electrolyte on corrosion rate of Pb-Sb anodes in copper electrowinning

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.

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Synergistic effects of added bivalent aqua cobalt ion, bivalent aqua iron ion and aqueous sulfurous acid on a graphite anode during electrodeposition of copper from a sulfate bath

Panda

Das

Panda

2004

Hydrometallurgy

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Effect of cobalt added to electrolyte on corrosion rate of Pb-Sb anodes in copper electrowinning

Cited by 8 publications

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Electrometallurgy

Electrometallurgy

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

Synergistic effects of added bivalent aqua cobalt ion, bivalent aqua iron ion and aqueous sulfurous acid on a graphite anode during electrodeposition of copper from a sulfate bath

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