高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (1): 116.

• 研究论文 • 上一篇    下一篇

铅锡合金在硫酸溶液中生长阳极Pb(Ⅱ)氧化物膜的机理

柳厚田, 梁海河, 杨炯, 周伟舫   

  1. 复旦大学化学系, 上海 200433
  • 收稿日期:2000-07-13 出版日期:2002-01-24 发布日期:2002-01-24
  • 通讯作者: 柳厚田(1944年出生),男,教授,从事电化学研究.
  • 基金资助:

    国家自然科学基金(批准号:29873013)资助

The Growth Mechanism of the Anodic Pb(Ⅱ) Film Formed on Lead-tin Alloy in Sulfuric Acid Solution

LIU Hou-Tian, LIANG Hai-He, YANG Jiong, ZHOU Wei-Fang   

  1. Department of Chemistry, Fudan University, Shanghai 200433, China
  • Received:2000-07-13 Online:2002-01-24 Published:2002-01-24

摘要: 用交流阻抗、开路电位衰退及线性电位扫描等方法在0.9V(vs.Hg/Hg2SO4)和4.5mol/LH2SO4溶液中,研究了铅及Pb-Sn合金电极上所生长的阳极氧化物膜.实验结果表明,阳极膜由溶解-沉淀机理控制生长,膜中微粒间为液膜,借助液膜作为离子通道可使膜中微粒发生阳极反应,锡有利于膜中PbO微粒表层阳极氧化为PbO1+x(0<x<1).

关键词: 阳极PbO膜, 溶解-沉积机理, 交流阻抗, 铅锡合金

Abstract: The properties of the anodic oxide film formed on Pb and Pb Sn alloy in 4.5 mol/L H2SO4 solution at 0.9 V(vs . Hg/Hg2SO4) have been investigated by the a.c. technique, open circuit decay curve, and linear sweep voltammetry. It was found that the anodic film grows via a dissolution-precipitation process. The PbO particles in the anodic film may be anodized further by using the interstitial liquid among the PbO particles for ionic transportation. Tin facilitates the process of oxidation of the surface layer of the PbO particles to PbO 1+x (0<x <1).

Key words: Anodic PbO film, Dissolution-precipitation mechanism, a.c. impedance, Lead-tin alloy

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