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《The Chinese Journal of Nonferrous Metals》 2004-02
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Bubble behavior on metal anode of aluminum electrolysis

XU Jun-li, SHI Zhong-ning, GAO Bing-liang, QIU Zhu-xian (School of Materials & Metallurgy, Northeastern University, Shenyang 110004, China)  
The behaviour of bubble evolved from metal anode was researched during aluminum electrolysis in a two-compartment see-through quartz cell. Within some time of the beginning of electrolysis, it is discovered that there are no oxygen bubbles produced in the anodic room at lower current density, while aluminum fog disperses in the cathodic room. All renascent oxygen is consumed for oxidizing metal anode to form metal oxide film. When the oxide film is thick enough, the oxidation velocity of metal anode becomes lower, then oxygen bubbles release from the anodic surface. At higher current density, since the produced oxygen is more than that consumed, oxygen is released. Bubbles released at low current density grow, coalesce to a big one and then set free at the anodic surface. The diameter of released bubble decreases with the increasing of current density.
【Fund】: 国家重点基础研究发展规划资助项目(G1999064903);; 国家"八六三"计划资助项目(2001AA335010)
【CateGory Index】: TF821
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