Abstract
The influence of Sb on the formation of the corrosion layer on Pb has been studied with a Pb—12%Sb alloy electrode in sulphuric acid solution using the ring-disk technique decay measurement and galvanostatic oxidation. It was found that in voltammograms of the PbSb electrode a new cathodic peak appears, compared to pure Pb, after oxidation at constant potentials > 0.8V, showing that a new oxidation product is formed. The stoichiometry of this product changes gradually with potential approaching that PbO 2 at high anodic potentials. This product also improves the electronic conductivity of the corrosion layer. The effect of Sb(III) or Sb(V) dissolved in the electrolyte on the formation of this Sb containing product on pure Pb was similar to that of Sb as an alloying agent. It is suggested that this new product is an oxide of Pb (most probably nonstoichiometric) doped with Sb or a mixed PbSb oxide.
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