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电化学  2014 

铝合金电解加工中的钝化行为及其对加工过程的影响

DOI: 10.13208/j.electrochem.130104, PP. 28-32

Keywords: 电解加工,铝合金,钝化,电流效率,表面形貌

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Abstract:

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.

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