中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 13 No. 3 June 2003 |
in Na3AlF6-Al2O3 based melts
（1. School of Metallurgical Science and Engineering,
Central South University, Changsha 410083, China
2. Chemistry Department, Guangxi Normal University, Guilin 5410043, China）
Abstract:Experimental technique has been inadequate to anodic overvoltage measurements in aluminum electrolysis. To determine its ohmic/voltage drop precisely, a current interruption technique was modified with a high frequency digital oscilloscope, current interrupters with fast switching time, an improved cell configuration and a simulation applied to the oscillating potential decay curve. The results show that the technique can give good reproducibility for overvoltage studies. A substantial increase of anodic overvoltage is observed with graphite powder addition, metallic aluminum addition and CO bubbling in the melts.
Key words: ohmic/voltage drop; anodic overvoltage; aluminum electrolysis
