✦ LIBER ✦

Effect of antimony on the anodic corrosion of lead and oxygen evolution at the Pb/PbO2/H2O/O2/H2SO4 electrode system

✍ Scribed by T. Rogachev

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 570 KB
Volume: 23
Category: Article
ISSN: 0378-7753
DOI: 10.1016/0378-7753(88)80077-6

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✦ Synopsis

When a Pb electrode immersed in HzS04 solution is polarized in the PbOz potential range the following electrode system is formed: Pb/PbOJ Hz0/02/H2S04.

At the oxide/solution interface oxygen evolution takes place. The semiproducts of this reaction, 0 atoms and O-radicals, diffuse into the anodic layer and oxidize the metal. As a result of a solid-phase reaction the metal is oxidized first to tet-PbO and then further oxidized to PbOz. By examining the changes in the Tafel slopes of the above reactions and by analyzing the chemical composition of the anodic layer, the effect of Sb on the above processes is assessed.

Antimony was introduced into the electrode system either by alloying it with the metal or by adding it to the H,SO, solution. It was established that Sb lowers the oxygen overvoltage and increases the rate of anodic corrosion of lead irrespective of the way in which it was introduced into the system. Antimony increases the stoichiometric coefficient of the oxide layer, hence, it enhances the oxidation of PbO to PbOz. The results of these investigations confirm the mechanism of the processes proceeding during anodic oxidation of lead.

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