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本文研究与分析了铝合金电解加工过程的钝化行为,探讨了加工电压、电流密度、加工间隙及电解液成分等因素对电解加工性能的影响.研究表明,在试验温度(23±1)oC下,铝合金在NaNO3和NaF复合电解液体系(钝化电解液)存在钝化现象,钝化降低了电解加工的电流效率,并使电流效率随电流密度发生较大变化.同时,钝化也使间隙特征曲线负移.而在相同浓度NaCl和NaF复合电解液体系(活化电解液)电解加工,可在很宽的电位范围内保持活性溶解.在钝化电解液中,电解加工表面更加平整.
In this paper, the passivation behavior of aluminum alloy during electrolytic machining was studied and analyzed, and the effects of processing voltage, current density, machining gap and electrolyte composition on the electrolytic machining performance were investigated. The results show that at the test temperature of (23 ± 1) oC , The passivation of aluminum alloy in the NaNO3 and NaF composite electrolyte system (passivation electrolyte) is passivated, passivation reduces the current efficiency of electrolysis process, and the current efficiency changes greatly with the current density.At the same time, passivation So that the gap characteristic curve negative shift in the same concentration of NaCl and NaF composite electrolyte system (activation electrolyte) electrolytic processing, can be maintained within a wide range of potential active dissolution in the passivation electrolyte, electrolysis processing surface is more smooth .