氯离子浓度对锌电积用铝基铅合金复合β-PbO2颗粒阳极行为的影响

doi:10.11944/j.issn.1000-0518.2015.08.140434

摘要/Abstract

摘要：

在酸性硫酸锌体系中研究了不同氯离子含量对Al/Pb-0.3%Ag-0.06%Ca复合β-PbO₂颗粒阳极行为的影响, 并通过X射线衍射(XRD)以及扫描电子显微镜(SEM)等技术手段来表征阳极的特征。结果表明, 随着氯离子含量的增加, 阳极的析氧过电位逐渐增大;阻抗呈逐渐增大的趋势;阳极表面膜β-PbO₂和α-PbO₂衍射峰强度整体呈现出减弱的趋势;阳极氧化膜上的枝状晶簇消失;腐蚀速率逐渐增大。当氯离子含量为300 mg/L时, 阳极具有最大的表观电流密度i₀, 表现出了最好的电化学性能以及耐腐蚀性。

关键词: 铝基, 铅合金阳极, 电化学性能, 氯离子, 耐腐蚀性

Abstract:

The anodic behavior of Al/Pb-0.3%Ag-0.06%Ca/β-PbO₂ composite electrode in the acidic zinc sulphate containing different concentrations of Cl^- was studied. The microstructures were investigated by scanning electron microscopy(SEM) and X-ray diffraction(XRD). With the increase of Cl^- concentration, the oxygen evolution overpotential, impedance and corrosion rate increase gradually; the intensity of diffraction peak of β-PbO₂ and α-PbO₂ decreases gradually; the dendritic crystal clusters on the anode surface disappear. When the Cl^- concentration is 300 mg/L, the apparent current density(i₀) of the anode reaches maximum and the anode shows the best electrochemical properties and corrosion resistance.

Key words: Al substrate, lead alloy anode, electrochemical properties, chloride ion, corrosion resistance

中图分类号:

杨健, 陈步明, 王帅, 郭忠诚. 氯离子浓度对锌电积用铝基铅合金复合β-PbO₂颗粒阳极行为的影响[J]. 应用化学, 2015, 32(8): 955-962.

YANG Jian, CHEN Buming, WANG Shuai, GUO Zhongcheng. Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO₂ Composite Anode During Zinc Electrowinning[J]. Chinese Journal of Applied Chemistry, 2015, 32(8): 955-962.

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氯离子浓度对锌电积用铝基铅合金复合β-PbO₂颗粒阳极行为的影响

Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO₂ Composite Anode During Zinc Electrowinning

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