Electrochemical Performance of a New Type Aluminum Foam/Pb-0.6 wt%Ag Alloy Composite Anode for Zinc Electrowinning Industry

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-10-01 DOI:10.1016/S1875-5372(18)30225-X

Zhou Xiangyang, Ma Chiyuan, Yang Juan, Wang Shuai, Wang Hui, Long Bo

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引用次数: 4

Abstract

In order to overcome the defects of high over-potential and preparation cost existing in traditional Pb alloy anodes, a new type aluminum foam/Pb-0.6 wt%Ag alloy composite anode (AF/Pb-0.6 wt%Ag anode) was produced. The electrochemical performance of AF/Pb-0.6 wt%Ag anode and traditional Pb-0.6 wt%Ag anode after 72 h galvanostatic polarization in 160 g/L H₂SO₄ solution was investigated comparatively by chronopotentiometry (CP), scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS) and Tafel measurements. The results show that the anodic layer of AF/Pb-0.6 wt%Ag anode is more intact than that of the Pb-0.6 wt%Ag anode, and exhibits better corrosion resistance. Moreover, the AF/Pb-0.6 wt%Ag anode shows a lower stable anodic potential, which is consistent with higher PbO₂, lower PbO, PbO·PbSO₄ content and R_ct value obtained by CP and EIS measurements. It is also revealed that the AF/Pb-0.6 wt%Ag anode possesses a better oxygen evolution reaction (OER).

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锌电积工业用新型泡沫铝/铅-0.6 wt%银合金复合阳极的电化学性能

为克服传统Pb合金阳极存在的过电位高、制备成本高等缺陷，研制了一种新型泡沫铝/Pb-0.6 wt%Ag合金复合阳极(AF/Pb-0.6 wt%Ag阳极)。采用时间电位法(CP)、扫描电镜(SEM)、电化学阻抗谱(EIS)和Tafel测量等方法，比较了AF/Pb-0.6 wt%Ag阳极与传统Pb-0.6 wt%Ag阳极在160 g/L H2SO4溶液中静电流极化72 h后的电化学性能。结果表明:AF/Pb-0.6 wt%Ag阳极的阳极层比Pb-0.6 wt%Ag阳极的阳极层更完整，且具有更好的耐腐蚀性;此外，AF/Pb-0.6 wt%Ag阳极表现出较低的稳定阳极电位，这与CP和EIS测量得到的较高的PbO2、较低的PbO、PbO·PbSO4含量和Rct值一致。AF/Pb-0.6 wt%Ag阳极具有较好的析氧反应(OER)。

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