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化学学报
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化学学报 ›› 1992, Vol. 50 ›› Issue (5): 467-472. 上一篇    下一篇

研究论文

Pb及Pb-7w/O Sb合金在氧析出电位区生长的阳极膜

卫昶;陈霞玲;周伟舫   

  1. 复旦大学化学系
  • 发布日期:1992-05-15

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

WEI CHANG;CHEN XIALING;ZHOU WEIFANG   

  • Published:1992-05-15

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分别测量了Pb及Pb-7w/0Sb在4.5mol.dm^-^3H^2SO~4(30℃)中于1.3和1.5V(vs.Hg/Hg~2SO~4/4.5mol.dm^-^3H^2SO~4)下在不同时间生长的阳极膜的交流阻抗谱, 并使用线性电位扫描法分析了上述阳极膜的相组成。讨论了上述阳极膜进行的电化学反应的机理, 并据此提出它们的等效电路。实验结果表明上述阳极膜的真实表面积随生长时间而增加, 该膜多孔, 主要由外层为PbO~2的PbO.PbSO~4微粒组成, 锑能显著抑制PbO~2的生长, 特别是在1.3V时。

关键词: 反应机理, 锑合金, 等效电路, 电化学反应, 铅合金, 阳极膜, 铅蓄电池, 电位扫描法

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

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