氧化物阳极在不同温度下硫酸及海水中强化寿命规律及机理分析  

Deactivation behavior and mechanism of metal oxide anode at different temperature of seawater and sulfuric acid

作　　者：张胜健 辛永磊[2] 

机构地区：[1]太原工业学院化学与化工学院,山西太原030008 [2]中国船舶重工集团公司第七二五研究所海洋腐蚀与防护重点实验室,山东青岛266101

出　　处：《山西化工》2015年第3期23-26,共4页Shanxi Chemical Industry

摘　　要：采用热分解法在钛基体上涂覆钌、铱、锡涂液制备金属氧化物阳极,在不同温度的硫酸和海水中采用强化电解实验考察温度对金属氧化物阳极的寿命影响规律,采用扫描电镜、能谱、电化学阻抗、析氯效率等手段分析金属氧化物阳极在2种溶液中的失效机制。实验结果表明,金属氧化物阳极在硫酸中寿命随着温度的上升呈下降趋势;在海水中的寿命受温度的影响较大,随着温度的上升,寿命明显增长。金属氧化物阳极在硫酸中失效前后表面形貌相差大,涂层几乎完全脱落,电阻迅速增大,主要是基体表面生产不导电的二氧化钛。阳极在海水中失效后表面呈现出边界,边界与中心处呈现出2种不同的微观形貌,失效后仍有一定的活性,失效与表面有效物质的溶解、剥离密切相关。The Rn-Ir-Sn metal oxide anodes coated on titanium are prepared by thermal decomposition. Accelerated life of anodes are tested at different temperature of seawater and sulfuric acid. The anodes are studied by SEM, EDX, electrochemical impedance spectroscopy and chlorine evolution efficiency etc, which characterize the deactivation behavior and mechanism of metal oxide anodes electrolyzing at different temperature of seawater and sulfuric acid. The results indicate that the life of metal oxide anode in sulfuric acid would decreases with temperature increase but the life would increase in seawater. The morphology of fresh anodes and deactivation anodes in sulfuric acid are different, the coating almost peels off. The resistance of anode in- creases rapidly which is caused by non-conductive TiO2. The surface of deactivation anodes presents a boundary at low temper- ature of seawater. Different morphology appears at the center and edge and deactivation anodes are active. Deactivation is caused by dissolution and partial detachment of the coating.

关 键 词：金属氧化物阳极 温度 海水 硫酸 失效机理 

分 类 号：TG172[金属学及工艺—金属表面处理] TQ151[金属学及工艺—金属学]