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

冰晶石熔盐中阳极效应时石墨阳极的电化学行为(英文)

作　　者：陈功[1] 石忠宁[1,2] 高炳亮[1,2] 胡宪伟[1,2] 王兆文[1,2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110004 [2]东北大学 有色金属冶金过程技术教育部工程研究中心,沈阳110004

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第9期2306-2311,共6页中国有色金属学报（英文版）

基　　金：Projects (50804010, 51074046) supported by the National Natural Science Foundation of China

摘　　要：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.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3.28V,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。

关 键 词：anode behavior aluminum electrolysis PERFLUOROCARBONS anode passivation 

分 类 号：O646[理学—物理化学]