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A Pb-2%Ag alloy, which may be used instead of corrosive graphite and expensive platinum electrodes for a protective anode in electrolysis, was studied by measuring its anodic polarization curve and examining the surface film formed during anodic polarization in artificial sea water. The effect of platinum coating on the anodic behavior of the lead alloy was also studied; a chemical coating of chloroplatinic acid solution was applied to covering the electrode surface with a platinum lamina 5-10u thick. The results obtained are as follows: 1) Lead carbonate chloride was formed on the surface of the lead alloy electrode in a very early stage of electrolysis in artificial sea water. 2) The main component of the film formed on lead alloy anode was B-PbO2 when artificial sea water was adjusted to alkaline (pH 10). 3) Anodic polarization behavior of the electrode covered with platinum was similar to that of pure platinum electrode except for the active region where lead dissolves.

Anodic Polarization Behavior of Lead Alloy and Its Platinum Coating Electrodes in Artificial Sea Water