Effect of Ag Content and β-PbO2 Plating on the Properties of Al/Pb-Ag Alloy

IF 0.6 4区 材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY 稀有金属材料与工程 Pub Date : 2018-07-01 DOI:10.1016/S1875-5372(18)30171-1
Zhou Xiangyang , Wang Shuai , Ma Chiyuan , Long Bo , Wang Hui , Yang Juan , Guo Zhongcheng , Chen Buming
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引用次数: 2

Abstract

Due to the excellent electrical conductivity and mechanical properties, Al/Pb-Ag alloy has a great potential to be used as an alternative anode for zinc electrowinning. In this work, the effects of Ag content and surface plating with β-PbO2 on the anodic behavior and reaction kinetics were investigated by cyclic voltammetry (CV), anodic polarization curves, electrochemical impedance spectroscopy (EIS) and corrosion rate test. The phase composition and microscopic morphology of the anode oxide layers after electrolysis were observed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results indicate that high content of silver and electroplating β-PbO2 layer can increase the oxygen evolution activity, electrocatalytic activity and corrosion resistance of the anodes. Al/Pb-0.75%Ag plating β-PbO2 has the lowest oxygen evolution overpotential followed by Al/Pb-0.3%Ag plating β-PbO2, Al/Pb-0.75%Ag and Al/Pb-0.3%Ag. Besides, high content of silver is more beneficial to improving corrosion resistance compared with electroplating β-PbO2 on anode. In addition, the phase composition of four anodes layer are mainly composed of α-PbO2, β-PbO2, Pb and PbO.

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银含量及镀β-PbO2对Al/Pb-Ag合金性能的影响
Al/Pb-Ag合金具有优良的导电性能和力学性能,具有作为锌电积替代阳极的巨大潜力。通过循环伏安法(CV)、阳极极化曲线、电化学阻抗谱(EIS)和腐蚀速率测试,研究了银含量和表面镀β-PbO2对阳极行为和反应动力学的影响。利用x射线衍射仪(XRD)和扫描电镜(SEM)分别观察电解后阳极氧化层的物相组成和微观形貌。结果表明,高含量的银和电镀β-PbO2层可以提高阳极的析氧活性、电催化活性和耐腐蚀性。镀Al/Pb-0.75%Ag的β-PbO2的析氧过电位最低,其次是镀Al/Pb-0.3%Ag的β-PbO2、镀Al/Pb-0.75%Ag的β-PbO2和镀Al/Pb-0.3%Ag的β-PbO2。此外,与阳极上电镀β-PbO2相比,高银含量更有利于提高阳极的耐腐蚀性。此外,4个阳极层的相组成主要由α-PbO2、β-PbO2、Pb和PbO组成。
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来源期刊
稀有金属材料与工程
稀有金属材料与工程 工程技术-材料科学:综合
CiteScore
1.30
自引率
57.10%
发文量
17973
审稿时长
4.2 months
期刊介绍:
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