铅及铅锑合金阳极膜中硫酸铅的氧化过程

摘要/Abstract

应用电位阶跃和交流阻抗法分别研究铅和Pb-5wt% Sb合金在4.5mol·dm^-^3H~2SO~4(30℃)中于1.3V(vs. Hg/Hg~2SO~4, 下同)生长20min后的阳极膜在0.9V还原5min后再在1.4V将膜中硫酸铅氧化的过程。实验结果表明在0.9V还原二氧化铅而得到的硫酸铅能在1.4V于1min内氧化为二氧化铅。这是由于此种硫酸铅处于硫酸铅颗粒表层的缘故。至于颗粒内部由铅直接生成的硫酸铅的氧化为二氧化铅就要缓慢得多。合金中的锑能使二氧化铅晶核形成和生长速率显著降低。

关键词: 铅, 铅锑合金, 阳极氧化, 氧化铅, 阳极膜, 硫酸铅

The oxidation processes of lead sulphate in the anodic films on lead and Pb-5wt% Sb alloy, which were formed by the reduction at 0.9V (vs. Hg/Hg~2SO~4, the same reference electrode below) for 5min of the anodic films grown in a 4.5mol·dm^-^3 H~2SO~4 solution (30℃) at 1.3V for 20min, have been studied using potential step and a.c. impedance methods respectively. The experimental results show that the lead sulphate, which is formed by reducing lead dioxide, can be reoxidized to lead dioxide within 1min at 1.4V. This is due to the fact that this kind of lead sulphate is at the surface layers of the lead sulphate grains in the anodic film. The oxidation process of lead sulphate in the inner part of the grain, which is formed directly by anodizing lead, is much slower. The antimony in the lead alloy inhibits significantly the nucleation and growth of lead dioxide crystals.

Key words: LEAD, LEAD ANTIMONY ALLOYS, ANODIC OXIDATION, LEAD OXIDE, ANODIC FILM, LEAD SULFATE

中图分类号:

O646

引用此文

韦国林,陈霞玲,周伟舫. 铅及铅锑合金阳极膜中硫酸铅的氧化过程[J]. 化学学报, 1995, 53(4): 313-317.

WEI GUOLIN;CHEN XIALING;ZHOU WEIFANG. The oxidation processes of lead sulphate in the anodic films on pure and antimonial lead[J]. Acta Chimica Sinica, 1995, 53(4): 313-317.

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