氯离子对Pb-Ag-RE合金阳极电化学行为的影响  

EFFECTS OF CHLORIDE ION ON THE ELECTROCHEMICAL BEHAVIOR OF Pb-Ag-RE ALLOY ANODE

作　　者：钟晓聪[1] 蒋良兴[1] 吕晓军[1] 赖延清[1] 李劼[1] 刘业翔[1] 

机构地区：[1]中南大学冶金与环境学院,长沙410083

出　　处：《金属学报》2015年第3期378-384,共7页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51204208和51374240;湖南省自然科学基金项目13JJ1003;中国博士后科学基金项目2013M540638;中南大学中央高校基本科研业务费专项资金项目2014zzts028资助~~

摘　　要：采用恒流极化,SEM,XRD,EIS和Tafel扫描对比研究了Pb-Ag-RE合金阳极在无Cl-和含500 mg/L Cl-H2SO4溶液中的腐蚀行为和析氧行为.结果表明,Pb-Ag-RE阳极在含Cl-电解液中生成的氧化膜层出现"火山口"状孔洞,合金基底上分布着大量的腐蚀坑,呈现出明显的局部腐蚀特征.此外,Cl-的存在会减少阳极表面氧化膜层中Pb O2的含量,抑制析氧反应中间产物的生成和吸附,进而增加析氧反应传荷阻抗.因此,500 mg/L的Cl-对Pb-Ag-RE合金阳极的耐腐蚀性能和析氧活性均会造成不利影响,工业生产中应尽量降低电解液中Cl-的浓度.Corrosion and oxygen evolution behavior of Pb-Ag-RE alloy anode has been comparatively investigated in H2SO4 solution without Cl-and with 500 mg/L Cl-by galvonostataic polarization, SEM, XRD, EIS and Tafel scanning. The results show that anodic layer on Pb-Ag-RE anode formed in electrolyte with Cl-exhibits‘volcanic vent’-like holes, and the metallic substrate in this electrolyte shows obvious localized corrosion feature with large numbers of corrosion pits. In addition, the presence of Cl-decreases the amount of Pb O2 on the surface of anodic layer. It also inhibits the formation and adsorption of oxygen evolution intermediates, and further enhances the charge transfer resistance of oxygen evolution reaction. Therefore, Cl-is detrimental to the corrosion resistance and oxygen evolution reactivity of Pb-Ag-RE alloy anode. Consequently, the Cl-concentration in electrolyte should be reduced as low as possible during industrial operation.

关 键 词：Pb-Ag-RE合金 铅基阳极 电沉积 氯离子 局部腐蚀 析氧反应 

分 类 号：TF813[冶金工程—有色金属冶金] O646[理学—物理化学]