Corrosion Behavior of Pb-Ca-Sn Electrodes for Copper Electrowinning
Anodic polarization behavior of ternary alloy Pb-0.08%Ca-1%Sn is studied by potentiodynamic polarization measurements, corrosion rate, the products on electrode surface after polarization, and microstructure of anode mud after polarization in electrowinning cell. The results show that Pb-Ca-Sn anode is easy to be passivated in electrolyte for copper electrowinning, the maintaining passivity current density is 97.72 µA•cm-2 and the corrosion products on the surface of Pb-Ca-Sn electrode present loose scaly, being composed of α-PbO2, β- PbO2 and PbSO4 after polarization.
Hongxi Zhu and Linjiang Wang
X. T. Yuan et al., "Corrosion Behavior of Pb-Ca-Sn Electrodes for Copper Electrowinning", Advanced Materials Research, Vol. 402, pp. 349-353, 2012