Al/Pb-0.2%Ag阳极在氟离子和硫酸体系中的电化学行为

doi:10.11944/j.issn.1000-0518.2016.12.160086

摘要/Abstract

摘要：

为了研究铝基铅银合金阳极在含氟离子和硫酸的体系中电化学行为,对含银0.2%的铝基铅银合金阳极(Al/Pb-0.2%Ag)分别在不同氟离子(F^-)和硫酸浓度下进行循环伏安测试和恒电流极化曲线进行了测试。结果表明,F^-浓度升高时,对阳极表面单质铅氧化成二价铅以及二价铅氧化成四价铅有抑制作用,对四价铅还原为二价铅有抑制作用,但是对二价铅还原为单质铅有促进作用;此时析氧反应受阻,氧化成膜反应将被促进;硫酸浓度升高时,阳极上面铅的氧化和还原程度均先增大后减小;硫酸浓度为20 g/L、F^-浓度0.1 g/L时阳极的氧化成膜和析氧反应最为有利。

关键词: Al/Pb-0.2%Ag阳极, 电化学行为, 氧化成膜, 析氧反应

Abstract:

In order to study the electrochemical behavior of aluminum-lead-silver alloy anodes based on aluminum in the systems of containing fluoride ion and sulfuric acid. Testing cyclic voltammetry and galvanostatic polarization curves of Al/Pb-0.2%Ag anode in different concentrations of fluoride ion and sulfuric acid systems, respectively. The results show that oxidation and the reduction that tetravalence switch to bivalence of lead on the anode surface were inhibited, though the reduction tetravalence switch to simple substance of lead was promoted, and oxygen evolution reaction was inhibited while oxidation film-forming was promoted with increasing F^- concentration. The oxidation and reduction of lead are increased at first then decreased with the increasing sulfuric acid concentration. They are the most favorable conditions for oxidation film-forming and oxygen evolution reaction of the anode at sulfuric acid and F^- concentration of 20 g/L and 0.1 g/L.

Key words: Al/Pb-0.2%Ag anode, electrochemical behavior, oxidation film-forming, oxygen evolution reaction

宋宏伟, 黄惠, 谭宁, 陈步明, 郭忠诚. Al/Pb-0.2%Ag阳极在氟离子和硫酸体系中的电化学行为[J]. 应用化学, 2016, 33(12): 1455-1461.

SONG Hongwei, HUANG Hui, TAN Ning, CHENG Buming, GUO Zhongcheng. Electrochemical Behavior of Al/Pb-0.2%Ag Anode in Fluoride Ion and Sulfuric Acid[J]. Chinese Journal of Applied Chemistry, 2016, 33(12): 1455-1461.

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