Abstract: A new anode of Al/Pb-0.23％Ag was prepared from methanesulfonic acid bath by electrodeposition for zinc electrowinning. The results of corrosion test and electrochemical analysis show that the Al/Pb-0.23％Ag anode has a lower corrosion rate, higher corrosion potential and lower corrosion current density, higher electrocatalytic activity as compared to conventional Pb-0.25％Ag anode. The metallographic structure and scanning electron microscopy(SEM) observations show that the Al/Pb-0.23％Ag anode has tiny and dense crystals. X-ray diffraction(XRD) analysis shows that the Al/Pb-0.23％Ag anode has the phase of PbSO4, α-PbO2 and β-PbO2 after 48 h of anodic polarization.

Key words: Al/Pb-0.23％Ag anode, corrosion resistance, zinc electrowinning, oxygen evolution reaction potential