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

Nguyen, Thu T.A., 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: 215-224. doi:10.1007/s10800-007-9427-9


Author Nguyen, Thu T.A.
Guresin, N.
Nicol, M.
Atrens, A.
Title Influence of cobalt ions on the anodic oxidation of a lead alloy under conditions typical of copper electrowinning
Journal name Journal of Applied Electrochemistry   Check publisher's open access policy
ISSN 0021-891X
Publication date 2008-02-01
Year available 2008
Sub-type Article (original research)
DOI 10.1007/s10800-007-9427-9
Open Access Status DOI
Volume 38
Issue 2
Start page 215
End page 224
Total pages 10
Editor Wragg, A.A.
Place of publication Netherlands
Publisher Springer Netherlands
Language eng
Subject 291403 Alloy Materials
C1
8612 Fabricated Metal Products
091207 Metals and Alloy Materials
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.
Keyword Electrochemistry
Electrochemistry
ELECTROCHEMISTRY
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: 2009 Higher Education Research Data Collection
 
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Created: Mon, 16 Mar 2009, 23:17:30 EST by Sally Beard on behalf of Materials