(南京理工大學(xué) 化工學(xué)院， 南京 210094)
摘 要: 簡述了高純鋁在有機(jī)電解質(zhì)中形成的氧化鋁膜的擊穿和電解液閃火的過程， 分析了氧化鋁膜擊穿和電解液閃火的機(jī)理。 實(shí)驗(yàn)結(jié)果證明：氧化鋁膜的缺陷和缺陷處微孔中高壓氧的析出是氧化鋁膜擊穿和電解液閃火的前驅(qū)點(diǎn)； 形成槽周圍氣體的壓力對陽極上氧氣的析出有很大影響， 導(dǎo)致氧化鋁膜的擊穿電壓和電解液的閃火電壓發(fā)生變化。在壓力為0.01MPa 時， 陽極氧化鋁膜的擊穿電壓只有435V； 在壓力為0.10MPa時， 氧化鋁膜的擊穿電壓為460V； 在壓力為0.20MPa時， 氧化鋁膜的擊穿電壓大于500V。
關(guān)鍵字: 陽極氧化； 擊穿電壓； 閃火； 氧化鋁膜
（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
