Anodic films grown at oxygen evolved potential range on Pb and Pb-7W/O Sb alloy

Abstract

Anodic films formed on Pb and Pb-7wt.% Sb in 4.5 mol.dm-3 H2SO4(30? at both 1.3 V and 1.5 V (vs. Hg/Hg2SO4/4.5 mol.dm-3 H2SO4) were studied, resp., using a.c. impedance method and linear potential sweep method. The latter method was used for analyzing the phase composition of the mentioned films. The mechanisms of the electrochem. reactions at the films are discussed, and their equivalent circuits were suggested accordingly. The experimental results show that the true surface area of the films increase with increasing of the formation time. The films may be porous and consist of PbO2 particles, the inner part of which are PbO.PbSO4. Sb retards the growth of PbO2, especially at 1.3 V.

Key words: REACTION MECHANISM, ANTIMONY ALLOYS, EQUIVALENT CIRCUITS, ELECTROCHEMICAL REACTION, LEAD ALLOYS, ANODIC FILM, LEAD ACID STORAGE BATTERIES

CLC Number:

O646

Cite this article

WEI CHANG;CHEN XIALING;ZHOU WEIFANG. Anodic films grown at oxygen evolved potential range on Pb and Pb-7W/O Sb alloy[J]. Acta Chimica Sinica, 1992, 50(5): 467-472.

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Pb及Pb-7w/O Sb合金在氧析出电位区生长的阳极膜