IrO_2+Ta_2O_5系钛基改性涂层阳极和失效特点  

The Surface Modifications and Failure Mechanism for IrO_2+Ta_2O_5 Coated Titanium Anodes

作　　者：姚书典[1] 沈嘉年[1] 孙娟[1] 王国平[2] 李爱军[2] 饶英相[2] 

机构地区：[1]上海大学,上海200072 [2]北京冶金设备研究设计总院,北京100029

出　　处：《稀有金属材料与工程》2006年第12期1916-1919,共4页Rare Metal Materials and Engineering

基　　金：上海教育委员会青年基金(203170)

摘　　要：研究了Ti/(IrO2+Ta2O5)涂层阳极钛基表面不同改性条件下的表面形貌,截面扫描和界面元素分布,电解强化寿命和失效机理。结果表明,钛基体表面改性对涂层表面形貌没有根本性影响,表面改性的涂层阳极在槽电压-电解时间曲线上具有很长的平台期,显示出很好的强化寿命,平台期的主要失效特点在于涂层的电化学溶解,溶解从“龟裂”处始发,并且逐层进行。The surface morphology, elements distribution at he interface between coating and matrix, accelerated life time test and failure mechanism were discussed under the conditions of different sublayer surface modifications for Ti/（IrO2＋Ta2O5） anodes such as special surface treatment （SST）, metal Ta and Pt modification. The results show that Ti based surface modification has no basal influence on the surface morphology, the anodes have very long term accelerated life time at the flat stage with different surface modifications. Electrolysis dissolve of oxides is the main failure mechanism for the anode at the flat stage starting from island banks.

关 键 词：钛阳极 失效机理 电解 二氧化铱 五氧化二钽 

分 类 号：TG174[金属学及工艺—金属表面处理]