(1. 中南大学 冶金科学与工程学院，长沙 410083；2. 河南豫光锌业有限公司，济源 464530)
摘 要: 采用复合电镀技术制备Pb/Pb-MnO2复合电催化阳极，研究MnO2微粒晶型与粒径、电极构置、施镀时间和添加剂等对镀层中微粒含量的影响，利用正交实验确定阳极制备的最优条件，运用循环伏安和恒流极化等手段对复合阳极的析氧电催化性能进行评价。结果表明：通过工艺优化，可在氟硼酸盐镀铅体系中实现Pb基体上Pb-MnO2复合镀，获得MnO2微粒含量为1%~10%(质量分数)的复合镀层；模拟工业锌电积过程中，电解初始阶段复合阳极电位相比铅阳极降低约300 mV，经过24 h电解后，其稳定电位仍比铅阳极低100 mV，与工业Pb-Ag(0.6%，质量分数)阳极的稳定电位相当。
关键字: 锌电积；复合电镀；Pb/Pb-MnO2阳极；氟硼酸盐体系；析氧电催化
zinc electrowinning
（1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. Henan Yuguang Zinc Industry Co., Ltd., Jiyuan 464530, China）
Abstract:A new type of Pb/Pb-MnO2 composite anode was prepared by composite electrodeposition, the effects of particle size and crystal of MnO2, electrodes configuration and electrodeposition time on the particles content in co-deposit were studied, and the optimum conditions of anode preparation were ascertained by orthogonal experiments. The electrocatalytic activity for oxygen evolution reaction (OER) of the composite anode was evaluated by cyclic voltammetry (CV) and galvanostatic polarization method. The results indicate that Pb/Pb-MnO2 composite deposit containing 1%~10% (mass fraction, %) MnO2 particles can be obtained in the fluoborate solution of lead plating. In the stimulant evaluation of industrial electrowinning, the composite anode prepared under the optimal conditions is about 300 mV, more active than the pure lead anode at the initial stage of electrolysis, and the stable potential after 24 h is 100 mV lower than that of pure lead anode, which is equal to that of Pb-Ag (0.6%) anode.
Key words: zinc electrowinning; composite electrodeposition; Pb/Pb-MnO2 anode; fluoborate system; oxygen evolution electrocatalysis
