(南京理工大学 化工学院， 南京 210094)
摘 要: 简述了高纯铝在有机电解质中形成的氧化铝膜的击穿和电解液闪火的过程， 分析了氧化铝膜击穿和电解液闪火的机理。 实验结果证明：氧化铝膜的缺陷和缺陷处微孔中高压氧的析出是氧化铝膜击穿和电解液闪火的前驱点； 形成槽周围气体的压力对阳极上氧气的析出有很大影响， 导致氧化铝膜的击穿电压和电解液的闪火电压发生变化。在压力为0.01MPa 时， 阳极氧化铝膜的击穿电压只有435V； 在压力为0.10MPa时， 氧化铝膜的击穿电压为460V； 在压力为0.20MPa时， 氧化铝膜的击穿电压大于500V。
关键字: 阳极氧化； 击穿电压； 闪火； 氧化铝膜
（School of Chemical Engineering,
Nanjing University of Science & Technology, Nanjing 210094, China）
Abstract:The breakdown of anode oxidation film on highly pure aluminum in organic electrolyte and the process of electrolyte spark were described, and the mechanism was discussed. It is verified that the high-pressure O2 evolution in the flaws and pores of oxidation film is the precursor of breakdown on oxidation film and electrolyte spark. The atmosphere pressure around formation slot affects the voltage of breakdown of oxidation film and electrolyte spark. When the atmosphere pressure is 0.01MPa, the breakdown voltage of oxidation film is 435V; when the atmosphere pressure is 0.10MPa, the breakdown voltage is 460V, and when the atmosphere pressure is 0.20MPa, the breakdown voltage is above 500V.
Key words: anode oxidation; breakdown voltage; spark; alumina film
