(東北大學 材料與冶金學院，沈陽 110004)
摘 要: 詳述了泄流式TiB2/G陰極電解槽的制作與電解運行操作。在焦粒焙燒、干法啟動后，保持
關鍵字: 鋁電解；泄流式電解槽；石墨化陰極；TiB2涂層；過電壓
（School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China）
Abstract:The construction and testing of a drained cell with TiB2/G graphitized cathode were described. The coke-bed baking method and a dry start-up technology were adopted. During 140 h of electrolysis the drained cell performed steadily at an anodic current density of 1.54 A/cm2 with a current efficiency of 86.5%. After electrolysis it was found that the TiB2 coating layer shows a low wear rate of 0.4 g/(h∙m2). Moreover, the overvoltage at different current densities is measured with an aluminum reference electrode by an interruption technique in the drained cell. The results can be depicted as a fairly straight line in a Tafel plot. The anodic overvoltage in the drained cell is close to the value in industrial cells, while the cathodic overvoltage in the drained cell is about 0.4 V higher than that in industrial cells at around 1 A/cm2, due to a stable molten Al layer and high molar NaF/AlF3 ratio of the bath close to the cathode.
Key words: aluminum electrolysis; drained cathode cell; graphitized cathode; TiB2 coating; overvoltage
