<Original Papers>Studies on Electrolytic Refining of Zinc. (VIII) : Corrosion of Lead Anodes Alloyed with Various Amounts of Silver

Lead anodes alloyed with silver in amounts up to 3 per cent were tested and the quantities of lead in the oxide films and the slimes which resulted from the disintegration of the anode were measured. From the results of corrosion studies conducted under the conditions of zinc electrolysis, it was found that a small addition of silver to the lead anode brought about much improvement in stability of the oxide film, decreasing slime formation. This effect of silver increases up to 1.5 per cent Ag, but further increase in silver of the anode tends gradually to increase slime formation. The thickness of the oxide film increases linearly with increase in silver of the anode, as if the silver would aid increasing porosity of the oxide film. Total lead quantities of the oxide film and the slime show the minimum at 1 per cent silver-lead alloy anode