中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 22 No. 9 September 2012 |
（1. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China;
2. Engineering Research Center for Process Technology of Nonferrous Metallurgy of Ministry of Education,
Northeastern University, Shenyang 110004, China）
Abstract:Anodic electrochemical behavior was studied on graphite anode at 1000 °C 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.
Key words: anode behavior; aluminum electrolysis; perfluorocarbons; anode passivation
