铱钽钛金属氧化物阳极的电化学特性

Electrochemical Characterization of Ir-Ta-Ti Metal Oxide Coated Titanium Anodes

采用热分解方法在钛基体上制备铱钽钛金属氧化物阳极 ,用扫描电镜对阳极涂层显微形貌进行分析 ,通过强化电解寿命试验、开路电位测试、消耗率试验及循环伏安曲线研究了金属氧化物阳极的电化学性能 .SEM分析结果表明铱钽钛金属氧化物阳极涂层呈现多孔多裂纹形貌结构 .随阳极涂层组成不同 ,涂层显微形貌表现出很大差异 ,这种差异直接影响阳极电化学性能 .电化学性能试验结果表明铱钽钛金属氧化物阳极在酸性介质和海水中具有良好的电化学稳定性和电化学活性 .此外 ,铱钽钛金属氧化物阳极在海水中的消耗率很低 ,属于不溶性的阳极材料 ,作为外加电流阴极保护用辅助阳极具有广泛的应用前景 .

Ir_Ta_Ti metal oxide coated titanium anodes of variable composition were prepared by thermal decomposition. Their micro morphorogies and electrochemical properties were characterized by scanning electron microscope, open circuit potential, cyclic voltammetry, consumption rate measurements and accelerated life test. The SEM results indicated that all coatings were of a porous and cracked_mud microstructure influenced greatly by the composition of coatings. The electrochemical measurements showed that the Ir_Ta_Ti ternary oxide_coated anodes exhibited excellent electrochemical activity and electrochemical stability in both acidic media and seawater which were affected by the composition and microstructure of the coatings. Owing to good corrosion resistance and low consumption rate in seawater, metal oxde coated anodes belong to insoluble material, and can be potentially applid in impressed current cathodic protection systems as an anode.