锌电积用新型Al/Pb-0.3%Ag-0.06%Ca复合β-PbO_2颗粒阳极的性能研究

Properties of a New Type Al/Pb-0.3%Ag-0.06%Ca/β-PbO_2 Composite Anode for Zinc Electrowinning

采用拉拔挤压复合技术制备了一种锌电积用新型Al/Pb-0.3%Ag-0.06%Ca复合β-PbO2颗粒阳极并对其极化24h后进行了性能研究.采用循环伏安曲线、阳极极化曲线、交流阻抗以及加速腐蚀试验测试阳极的电化学行为和耐蚀性;采用SEM和XRD对电解后的阳极进行了表征.并与工业用Pb-0.3%Ag-0.06%Ca合金阳极进行对比,结果表明:Al/Pb-0.3%Ag-0.06%Ca复合β-PbO2颗粒阳极的析氧过电位降低了125mV(0.05A/cm2);表观电流密度增大两个数量级;腐蚀速率低,新型阳极表现出了优良的电催化活性和耐蚀性.

In this paper,the properties of a new type Al /Pb -0.3%Ag -0.06%Ca /β-PbO2 composite an-ode and Pb -0.3%Ag -0.06%Ca alloy anode after electrolytic 24 h are investigated.Cyclic voltammetry curve,anodic polarization curve,nyquist plots curve and corrosion rate are used to observe the anode process.The microstructural features and phase composition are then measured by scanning electron microscope and X-ray diffraction respectively.Compared with Pb-0.3%Ag-0.06%Ca anode,the Al /Pb-0.3%Ag-0.06%Ca /β-PbO2 composite anode displays a decrease of the oxygen evolution overpotential by 125 mV（0.05 A /cm^2 ）. In addition,the apparent current density increases two orders of magnitude.The Al /Pb -0.3%Ag -0.06%Ca /β-PbO2 composite anode enjoys lower corrosion rate,better electrochemical properties and corrosion re-sistance.