Lead alloyed with less than 1% Ag is commonly used as an anode for zinc electrowinning. Lead±silver alloys allow a decrease in the oxygen overpotential, a reduced corrosion rate of lead and an increased mechanical resistance of the material [1±3]. In addition to the oxygen reaction, several oxidation reactions also take place on the lead anodes, which generate complexed Mn and MnO4 ions in the electrolyte, and MnO2 in the whole cell where slimes are observed to deposit progressively [4±6].