金相组织结构对Pb-Ag-RE合金阳极电化学行为的影响  

Effect of microstructure on electrochemical behavior of Pb-Ag-RE alloy anodes

作　　者：翟爱萍 蒋良兴[2] 钟晓聪[2] 吕晓军[2] 

机构地区：[1]河南豫光锌业有限公司,河南济源459000 [2]中南大学冶金与环境学院,湖南长沙410083

出　　处：《中国有色冶金》2015年第2期78-82,共5页China Nonferrous Metallurgy

基　　金：国家科技支撑计划课题(2012BAA03B04);国家自然科学基金(51204208;51374240)

摘　　要：采用循环伏安法、计时电位法、Tafel测试对比研究了3种具有不同金相组织结构的Pb-AgRE阳极的析氧行为。结果表明,金相组织中不同相的含量和分布影响阳极氧化成膜,进而影响阳极电化学行为;浇铸阳极金相中含有大量的晶界和富RE二次相,这些相在极化过程中易氧化成膜,因此浇铸阳极氧化膜最厚。其中,膜层中PbO_2含量也最大,促进活性位点的生成,因而浇铸阳极析氧活性高;压延面电极膜层最薄,但压延面电极和横截面电极析氧活性相当。Cyclic voltammetry, chronopotentiometry, and Tafel tests were employed to investigate electrochemical behavior of Pb-Ag-RE anodes with different microstructures. It is found that the concentration and distribution of various phase affects formation of anodic layer, and further influences electrochemical behavior of anode. Due to large amount of grain boundary and RE-rich second phase, anodic layer on cast anode is more readily to grow, and demonstrated to be thickest and has the largest concentration of PbO2 , which facilitates formation of active site for the oxygen evolution reaction （OER）. Flattening section of rolled Pb-Ag-RE anode showed the thinnest anodic layer, while has similar OER reactivity with cross section anode.

关 键 词：Pb-Ag-RE合金阳极 金相结构 计时电位 Tafel 电化学行为 

分 类 号：TF812[冶金工程—有色金属冶金]