电积锌用Pb-Ag/MnO_(2)涂层阳极制备及电化学性能  

Preparation and electrochemical properties of Pb-Ag/MnO_(2)coated anode for zinc electrodeposition

作　　者：李传斌 江洪林 田林[1,2,3,4] 袁学韬 胡志方 尹延西[1,2,3,4] LI Chuanbin;JIANG Honglin;TIAN Lin;YUAN Xuetao;HU Zhifang;YIN Yanxi(National Engineering Research Center for Environment-Friendly Metallurgy in Producing Premium Non-Ferrous Metals,GRINM Group Corporation Limited,Beijing 100088,China;GRINM Resources and Environment Tech.Co.,Ltd.,Beijing 100088,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;Beijing Engineering Research Center of Strategic Nonferrous Metals Green Manufacturing Technology,Beijing 100088,China)

机构地区：[1]中国有研科技集团有限公司高品质有色金属绿色特种冶金国家工程研究中心,北京100088 [2]有研资源环境技术研究院(北京)有限公司,北京100088 [3]北京有色金属研究总院,北京100088 [4]战略性有色金属绿色制造技术北京市工程研究中心,北京100088

出　　处：《矿冶》2024年第5期677-683,共7页Mining And Metallurgy

基　　金：国家重点研发计划项目(2022YFC3900804)。

摘　　要：铅银合金(Pb-Ag)是锌电积及其它冶金工艺中应用最广泛的阳极材料。随着节能环保要求的逐渐提高,由于存在过电位低和稳定性差等缺点,Pb-Ag阳极难以适用于绿色工业体系的发展。如何提升其析氧催化活性、降低能耗并提高其耐腐蚀性能,成为亟待解决的工业难题。采用恒电流电沉积法在Pb-Ag阳极上制备了纳米二氧化锰薄膜涂层,测试了阳极的组织和电化学性能。研究表明:MnO_(2)涂层表面疏松裂纹结构不仅提高了催化活性,还促进了传质过程的进行,使得Pb-Ag/MnO_(2)阳极的析氧反应活性和稳定性均优于Pb-Ag阳极。其中,Pb-Ag/MnO_(2)阳极的析氧过电位为555 mV,塔菲尔斜率为208.5 mV/dec,优于Pb-Ag阳极的析氧过电位和塔菲尔斜率。同时,Pb-Ag/MnO_(2)阳极在长周期的电解锌实验中表现出良好的析氧反应活性和耐腐蚀性能,其槽电压比Pb-Ag阳极槽电压小0.1 V左右,能耗低于Pb-Ag阳极。Lead-silver alloy(Pb-Ag)is the most widely used anode material in zinc electrowinning and other metallurgical processes.With the gradual increase of energy saving and environmental protection requirements,it is difficult to apply Pb-Ag anode to the development of green industrial system due to the disadvantages of low overpotential and poor stability.Improving the oxygen evolution catalytic activity,reducing energy consumption and enhancing corrosion resistance of Pb-Ag/MnO_(2) anode has become an urgent industrial problem to be solved.In this paper,a thin film coating of manganese dioxide nanoparticles was prepared on Pb-Ag anode by constant current electrodeposition,and the organization and electrochemical properties of the anode were tested.It was shown that the loose cracked structure on the surface of the MnO_(2) coating not only improved the catalytic activity but also promoted the mass transfer process,which made the oxygen evolution reaction activity and stability of the Pb-Ag/MnO_(2) anode better than that of the Pb-Ag anode.Among them,the oxygen evolution overpotential of the Pb-Ag/MnO_(2) anode is 555 mV,and the Tafel slope is 208.5 mV/dec,which is superior to the oxygen evolution overpotential and Tafel slope of the Pb-Ag anode.Meanwhile,the Pb-Ag/MnO_(2) anode shows good oxygen evolution reaction activity and corrosion resistance in the long-cycle zinc electrolysis experiments,and its tank voltage is about 0.1 V lower than that of the Pb-Ag anode,and the energy consumption is also lower than that of the Pb-Ag anode.

关 键 词：锌电积 Pb-Ag阳极 MnO_(2)涂层 析氧活性 电化学性能 耐腐蚀性能 

分 类 号：TF813[冶金工程—有色金属冶金] TF114[理学—物理化学] O646.542[理学—化学]