铝离子对锌电积用Al/Pb-0.2%Ag合金阳极电化学性能的影响  

Effect of aluminum ion on electrochemical properties of Al/Pb-0.2%Ag alloy anode for zinc electrowinning

作　　者：陈步明[1] 杨健[1] 郭忠诚[1,2] 黄惠 杨海涛[3] CHEN Bu-ming;YANG Jian;GUO Zhong-cheng;HUANG Hui;YANG Hai-tao(Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Kunming Hendera Science and Technology Co.,Ltd.,Kunming 650106,China;State Key Laboratory of Multi-Phase Complex Systems,Institute of Process Engineering,Chinese Academy o f Sciences,Beijing 100190,Chin)

机构地区：[1]昆明理工大学冶金与能源学院,昆明650093 [2]昆明理工恒达科技股份有限公司,昆明650106 [3]中国科学院过程与工程研究所,北京100190

出　　处：《中国有色金属学报》2018年第7期1371-1378,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(51004056;51564029);云南省应用基础研究基金资助项目(2010ZC052)~~

摘　　要：采用循环伏安、塔菲尔曲线、阳极极化、交流阻抗测试研究在含不同铝离子(Al^(3+))浓度的锌电解液中极化24 h后的Al/Pb-0.2%Ag(质量分数)阳极的腐蚀行为和析氧行为,并通过扫描电镜和X射线衍射仪分别观察阳极的表面形貌和阳极氧化膜的物相组成。结果表明:随着Al^(3+)浓度的增大,阳极的析氧电位、自腐蚀电流密度以及电极的电荷传质电阻呈现出逐渐增大的趋势;表观交换电流密度呈现出逐渐减小的趋势;α-PbO_2(111)衍射峰强度呈现出逐渐减弱的趋势,Pb(101)衍射峰强度呈现出逐渐增强的趋势;阳极表面氧化层被腐蚀的程度逐渐加深。Al^(3+)的存在降低了阳极的耐腐蚀性能和导电性能。The electrochemical properties of Al/Pb-0.2%Ag （mass fraction） alloy anode after 24 h electrolysis in zinc electrolyte containing different Al3＋ concentration was investigated. The corrosion behaviors and oxygen evolution of the anode were investigated using cyclic voltammetry, Tafel curves, anodic polarization, and electrochemical impedance spectra. The microscopic morphology and phase composition of the anodic oxide layers were charactered by scanning electron microscopy and X-ray diffraction, respectively. The results show that the increase of Al3＋ concentration leads to the increases of oxygen evolution overpotential, corrosion current density and charge-transfer resistance of the anodes while this is contrary to the apparent exchange current density. In addition, the intensity of diffraction peak consisting of a-PbO2（111） exhibits a decreasing trend, which is in contrary of Pb（100） diffraction peak. Furtkermore, A1/Pb-0.2%Ag alloy anodes exhibit a less uniform microstructure. The corrosion resistance and electrical conductivity of the anode are decreased when zinc electrolyte containing Al3＋.

关 键 词：Al/Pb-0 2%Ag阳极 耐腐蚀性能 铝离子 锌电积 

分 类 号：O646[理学—物理化学]