Abstract
The processes of the formation and reduction of the basic lead sulfates ( and ) have been studied by electrochemical techniques. Experiments indicate that is mainly formed at −200 mV while the amount of formed is very small. The peak potential for the reduction of becomes more negative with the increase of the sweep rate and the amount of . Besides the passivation film, basic lead sulfate layers can seriously obstruct the anodic film from growing. Both the formation and reduction of the basic lead sulfates occur via a dissolution‐deposition mechanism. During oxidation, the ion is produced through the dissolution of . During reduction, the ion reacts with the Pb2+ ion to form again; the diffusion of the OH−ion from the inner layer to the bulk solution is the rate‐controlling step.
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