铝基铅合金复合β-PbO_2颗粒阳极在不同Mn^(2+)浓度含Cl^-锌电积液中的电化学行为  

Effects of Mn^(2+) Concentration in Electric Effusion of Containing Cl^- for Zinc Electrowinning on Anodic Electrochemical Behavior of Al Suhstrate Lead Alloy/β-PhO_2 Anode

作　　者：杨健[1] 王帅[1] 陈步明[1] 郭忠诚[1,2] 

机构地区：[1]昆明理工大学材料与冶金工程学院,云南昆明650093 [2]昆明恒达科技股份有限公司,云南昆明650106

出　　处：《材料保护》2015年第8期24-28,32,共6页Materials Protection

基　　金：高等学校博士学科点专项科研基金资助课题(20125314110011);国家自然科学基金(51004056)资助

摘　　要：为了得到电催化活性高、导电性好、耐腐蚀性好、使用寿命长的锌电积阳极材料,通过拉拔挤压的方法对铝基铅合金复合β-Pb O2颗粒制成阳极,在温度为35℃,电流密度为500 A/m2的含特定Cl-浓度、不同Mn2+浓度的硫酸锌体系中电解24 h后,通过循环伏安、阳极极化、交流阻抗和加速腐蚀速率测试来研究阳极极化行为,通过X射线衍射仪(XRD)、扫描电镜(SEM)观察分析阳极的物相及表面形貌。结果表明:当Mn2+含量为5 g/L时,阳极的析氧电位和析氧过电位最低,阳极表面的β-Pb O2的衍射强度最大,阳极氧化膜晶粒变大成晶胞状,晶型也较为均匀,阳极表现出优异的电化学性能以及良好的耐腐蚀性。The Al substrate lead alloy/β- PbO_2anode was prepared by drawing extrusion.After the electrolysis for 24 h in the zinc sulfate system with the fixed concentration of Cl^- and different Mn^(2+) concentration under current density of 500A/m2 at 35 ℃,the anodic polarization behaviors were evaluated by the polarization curves,cyclic voltammetry curves,alternatingcurrent impedance curves and accelerated corrosion tests.The surface morphology and phase composition of the anode were investigated by scanning electron microscopy and X- ray diffractometer.Results showed that the oxygen evolution potential and the oxygen evolution overpotential of anode were the lowest when the Mn^(2+) concentration was 5 g/L.Meanwhile,the diffraction peak intensity of β-PbO_2 was the highest and the crystalline grains on the anodic oxide film became large and the grain shape turned uniform.Besides,the anode exhibited excellent electrochemical performance and good corrosion resistance.

关 键 词：电化学行为 铝基铅合金 β-PbO2颗粒 阳极 析氧电位 耐腐蚀性 锌电积 

分 类 号：O646.54[理学—物理化学]