氯离子浓度对锌电积用铝基铅合金复合β-PbO_2颗粒阳极行为的影响  

Effects of Chloride Ion on the Properties of Al/Pb Alloy/β-PbO_2 Composite Anode During Zinc Electrowinning

作　　者：杨健[1] 陈步明[1] 王帅[1] 郭忠诚[1,2] 

机构地区：[1]昆明理工大学冶金与能源学院,昆明650093 [2]昆明恒达科技股份有限公司,昆明650106

出　　处：《应用化学》2015年第8期955-962,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金资助项目(51004056)~~

摘　　要：在酸性硫酸锌体系中研究了不同氯离子含量对Al/Pb-0.3%Ag-0.06%Ca复合β-Pb O2颗粒阳极行为的影响,并通过X射线衍射(XRD)以及扫描电子显微镜(SEM)等技术手段来表征阳极的特征。结果表明,随着氯离子含量的增加,阳极的析氧过电位逐渐增大;阻抗呈逐渐增大的趋势;阳极表面膜β-Pb O2和α-Pb O2衍射峰强度整体呈现出减弱的趋势;阳极氧化膜上的枝状晶簇消失;腐蚀速率逐渐增大。当氯离子含量为300 mg/L时,阳极具有最大的表观电流密度i0,表现出了最好的电化学性能以及耐腐蚀性。The anodic behavior of Al/Pb-0.3% Ag-0.06% Ca/β-PbO2 composite electrode in the acidic zinc sulphate containing different concentrations of Cl^- was studied. The microstructures were investigated by scanning electron microscopy（SEM） and X-ray diffraction（XRD）. With the increase of Cl^- concentration, the oxygen evolution overpotential, impedance and corrosion rate increase gradually; the intensity of diffraction peak of β-PbO2 and α-PbO2 decreases gradually; the dendritic crystal clusters on the anode surface disappear. When the Cl^- concentration is 300 mg/L, the apparent current density （io） of the anode reaches maximum and the anode shows the best electrochemical properties and corrosion resistance.

关 键 词：铝基 铅合金阳极 电化学性能 氯离子 耐腐蚀性 

分 类 号：O646[理学—物理化学] TG172[理学—化学]