网状和片状氧化涂层阳极在电解锌过程中的电化学行为

研究两个网状和一个片状氧化涂层阳极在38℃的电解锌溶液中的催化性能,并与通用的Pd-0.7%Al合金的电化学性能进行对比。采用电化学测试方法进行实验,如循环动电位法、恒电流法、动电位法、开路电位法和原位电化学噪音法。经过2 h的开路电位实验,线性极化结果表明：网状Ti/（IrO2-Ta2O5）电极显示出非常好的性能,其腐蚀电流密度在三个氧化涂层阳极中是最低的（3.37μA/cm^2）。此外,在50 mA/cm^2和38℃的条件下,经过24 h的恒电流极化试验,网状Ti/MnO2阳极有最高的电位（1.799 V）,紧随其后的是片状Ti/（IrO2-Ta2O5）（1.775V）和网状Ti/（IrO...

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Published in中国有色金属学报：英文版 Vol. 26; no. 2; pp. 589 - 598
Main Author 张伟 Michael ROBICHAUD Edward GHALI Georges HOULACHI
Format Journal Article
LanguageEnglish
Published 2016
Subjects
氧化涂层阳极
片状
电化学性能
电化学测量
网状
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Summary:研究两个网状和一个片状氧化涂层阳极在38℃的电解锌溶液中的催化性能,并与通用的Pd-0.7%Al合金的电化学性能进行对比。采用电化学测试方法进行实验,如循环动电位法、恒电流法、动电位法、开路电位法和原位电化学噪音法。经过2 h的开路电位实验,线性极化结果表明：网状Ti/（IrO2-Ta2O5）电极显示出非常好的性能,其腐蚀电流密度在三个氧化涂层阳极中是最低的（3.37μA/cm^2）。此外,在50 mA/cm^2和38℃的条件下,经过24 h的恒电流极化试验,网状Ti/MnO2阳极有最高的电位（1.799 V）,紧随其后的是片状Ti/（IrO2-Ta2O5）（1.775V）和网状Ti/（IrO2-Ta2O5）阳极（1.705 V）。经过24 h的恒电流极化和16 h时的电位衰退实验后,线性极化方法验证了经过2 h的开路电位实验得出的结果,即网状Ti/（IrO2-Ta2O5）阳极有最低的腐蚀电流。网状Ti/（IrO2-Ta2O5）阳极在24 h极化后显示出更好的性能,并与通用的Pb-0.7%Al合金进行相比,过电位低-245 mV。
Bibliography:The catalytic performance of two oxides coated anodes （OCSs） meshes and one OCA plate was investigated in a zinc electrowinning electrolyte at 38 ℃. Their electrochemical behaviors were compared with that of a conventional Pb-0.7%Ag alloy anode. Electrochemical measurements such as cyclic voltammetric, galvanostatic, potentiodynamic, open-circuit potential （OCP） and in situ electrochemical noise measurements were considered. After 2 h of OCP test, the linear polarization shows that the corrosion current density of the Ti/（IrO2-Ta2O5） mesh electrode is the lowest （3.37μA/cm^2） among the three OCAs and shows excellent performance. Additionally, after 24 h of galvanostatic polarization at 50 mA/cm^2and 38 ℃, the Ti/MnO2mesh anode has the highest potential （1.799 V）, followed by the Ti/（IrO2-Ta2O5） plate （1.775 V） and Ti/（IrO2-Ta2O5） mesh （1.705 V） anodes. After 24 h of galvanostatic polarization followed by 16 h of decay, the linear polarization method confirms the sequence obtained after 2 h of OCP test, and the Ti/（IrO2-Ta2O5） mesh attains the lowest corrosion current density. The Ti/（IrO2-Ta2O5） mesh anode also shows better performance after 24 h of galvanostatic polarization with the overpotential lower than that of the conventional Pb-Ag anode by about 245 mV.
43-1239/TG
oxides coated anode; mesh; plate; electrochemical measurement; electrochemical behavior
Wei ZHANG, Michael ROBICHAUD, Edward GHALI, Georges HOULACHI （ 1. School of Metallurgical Engineering, Hunan University of Technology, Zhuzhou 412007, China; 2. Department of Mining, Metallurgy and Material Engineering, Laval University, Ste-Foy, Quebec G 1K 7P4, Canada; 3. Hydro-Quebec Research Center, Shawinigan, Quebec G9N 7N5, Canada）
ISSN:1003-6326