Electrochemical Behavior of Homogeneous Pb-Tℓ Alloys in IN H2SO4

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Abstract
The anodic polarization of Pb-Tℓ alloys (solid solutions) in 1n H2SO4 was investigated using potentiostatic and galvanostatic techniques. Scanning electron microscopy (SEM) and X-ray diffractometry were used in the identification of reaction products. In the potential range from –0.29 to 1.97 V (SHE), three principal film composition regions were distinguished: (1) From –0.29 (the rest potential) to 0.20 V, only PbSO4 was present. (2) From 0.20 to ca. 1.52 V, PbOtet was the principal product, although basic lead sulfates, and in some instances α-PbO2, were present. (3) From 1.52 to 1.97 V, β-PbO2 was tne dominant surface product. Removal of the β-PbO2 surface layer revealed an interior layer that contained significant quantities of α-PbO2. The relative amounts of PbO2 on the surface decreased in this potential region with increasing amounts of Tℓ in the alloy, and PbOtet became the dominant phase. The presence of Tℓ(III) in the electrolyte indicates that the PbO2 may have been reduced by the Tℓ(I...

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