화학공학소재연구정보센터
Journal of Applied Electrochemistry, Vol.40, No.3, 691-699, 2010
Electrochemical and physical characterisation of lead-based anodes in comparison to Ti-(70%) IrO2/(30%) Ta2O5 dimensionally stable anodes for use in copper electrowinning
The suitability of various dimensionally stable anodes (DSAsA (R)) was investigated in comparison to the conventional lead alloy anodes in the electrowinning of copper. DSA(A (R)) plate and mesh specimens of composition Ti-(70%) IrO2/(30%) Ta2O5 and lead-(6%) antimony were evaluated. The electrochemical behaviour of these anodes was studied by carrying out open circuit potential measurements, galvanostatic chronopotentiometry, cyclic voltammetry and chronoamperometry. Physical characterisation was done using a scanning electron microscope. It was observed that the DSA(A (R)) plate anode exhibited the highest corrosion resistance followed by the DSA(A (R)) mesh and lead anodes, respectively. The results also showed that during copper electrowinning using lead anodes, dissolution of the anode occurs while for both DSAsA (R) marginal loss of coating was observed. The lead anode had the highest anode potential followed by the DSA(A (R)) plate and mesh anodes, respectively. Overall, it was demonstrated that the DSA(A (R)) plate anode is the most suitable anode for copper electrowinning.