Dependence of the Composition of the Anodic Layer on the Oxidation Potential of Lead in Sulfuric Acid

Abstract

Potentiostatic oxidations of lead in 1N H2SO4 were performed in the potential range between −900 and +1400 mv (with respect to the mercury/mercury sulfate electrode). The anodic layer was subjected to x‐ray diffraction and chemical analysis. According to the phases present three potential ranges are discerned. From −956 to about −300 mv only PbSO4 is present. From −300 to +900 mv large amounts of PbSO4 and normalPbO‐normaltet are formed as well as small amounts of normalPbO·PbSO4 , 3normalPbO·PbSO4·H2O , 5normalPbO·2H2O or normalPbO orthorhombic and α‐PbO2 . Above +900 mv the divalent lead compound content decreases, while that of α‐PbO2 . rapidly increases. Above +1200 mv β‐PbO2 . is formed.

Effect of Sn and Ca doping on the corrosion of Pb anodes in lead acid batteries

“…According to Giess [8], tin suppresses the transformation of lead to a-PbO. Similar conclusions were derived by Pavlov et al [9] who suggested that Sn is incorporated into the PbO/PbO x crystal lattice. According to Takahashi et al [10] tin accelerates the growth of a-PbO 2 which prevents the formation of a PbSO 4 layer on the surface of the grid.…”

“…They also found that PbSn alloys exhibited increased corrosive attack along the grain boundaries at grid-electrolyte interface. As seen from the review of the literature [8][9][10][11][12] addition of Sn leads to increased reversibility and superior charge acceptance. However, it also leads to increased loss of active material due to dissolution of the passive film [11].…”

A New Potential‐pH Diagram for an Anodic Film on Pb in H 2 SO 4

“…15 and from Eq. 2, 3, 9 and our last assumption we can get the following activities on the interface of PbO 9 PbSO~PbSO4 an+ = 10 -6"4s aOH-= 10 -~'ss aso~-= apb 2+ = 1O -3"9 [16] The activities of ions on 3PbO 9 PbS04 . H20/PbO 9 PbS04…”

Characterization of Oxidation Product Films on Lead in Aqueous Media by In Situ Raman Spectroscopy

“…Today this property gives lead cotisiderable use in the chemical industry (3,47). While it is well known that the corrosion resistance is due to thin surface films, these have only been examined in detail in sulfuric acid solutions (48)(49)(50)(51)(52)(53)(54)(55)(56)(57)(58)(59)(60) and, to a lesser extent, in hydrochloric acid (61-64).…”