钛基IrO_2-Ta_2O_5氧化物阳极失效过程监测及失效机制探讨  

Failure Monitoring of Ti-Based IrO_2-Ta_2O_5 Oxide Anode and Exploration of the Failure Mechanism

作　　者：赵雅玲[1] 龙秀慧[2] 初立英[2] 

机构地区：[1]长春工业大学基础科学学院,吉林长春130012 [2]长春工业大学材料科学与工程学院,吉林长春130012

出　　处：《材料保护》2005年第6期48-51,共4页Materials Protection

摘　　要：为探讨氧化物阳极的失效机制,采用热分解法制备了钛基IrO2Ta2O5氧化物阳极,利用扫描电镜(SEM)、循环伏安测试(CV)、电化学阻抗(EIS)监测了阳极在硫酸溶液的强化电解过程中表面形貌和电化学性能的变化。结果表明,氧化物阳极的失效并非由氧化物涂层本身失去电催化活性所致,而是由于工作过程中基体金属腐蚀钝化、失去导电载体作用而使涂层大面积剥离所致。Ti-based IrO_2-Ta_2O_5 oxide anode was prepared by thermal decomposition. The failure mechanism of the oxide anode was studied. Thus the variations in the morphology and electrochemical properties of the oxide anode subject to accelerated electrolysis in aqueous sulfuric acid were examined by means of scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The results showed that the failure of the oxide anode was not attributed to the electrocatalytic deactivation of the oxide coating itself but to the large area delamination of the oxide coating caused by the corrosion passivation of the substrate metal which made the substrate unable to act as the electric conductive supporter.

关 键 词：氧化物阳极 强化电解 过程监测 电催化活性 失效机制 

分 类 号：TG172[金属学及工艺—金属表面处理]