Electrochemical behavior of graphite anode during anode effect in cryolite molten salts

来源期刊:中国有色金属学报(英文版)2012年第9期

论文作者:陈功 石忠宁 高炳亮 胡宪伟 王兆文

文章页码:2306 - 2311

关键词:阳极行为;铝电解;全氟碳化物;阳极钝化

Key words:anode behavior; aluminum electrolysis; perfluorocarbons; anode passivation

摘    要:在1000 ℃下采用循环伏安法研究石墨阳极在冰晶石氧化铝熔盐中的阳极电化学行为。讨论了循环伏安曲线中较高的电流峰。结果表明,在高电位条件下,一种含氧氟络合阴离子中的氟与碳阳极反应,且在阳极表面生成一层高电阻的CF膜。在含0.5%氧化铝的电解质中,石墨电极钝化电位为3.28 V,并随着氧化铝含量的增加而增大。这一现象表明,在冰晶石?氧化铝熔盐体系中氧化铝含量对阳极过程起着主导作用。

Abstract: Anodic electrochemical behavior was studied on graphite anode at 1000 ℃ in cryolite-alumina molten salt by means of cyclic voltammetry. The high current peak in a typical cyclic voltammogram was discussed. It is considered that a type of oxyfluoroaliminate complex anions reacts with carbon to form a high-resistance CF film on the anode surface at a high potential. The passivation potential is 3.28 V in 0.5% alumina-containing electrolyte, and the passivation potential increases with alumina content increasing which indicates that the alumina content determines the anodic process in the cryolite-alumina molten salt system.

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