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在Na2SiO3+NaOH体系电解液中加入Li2CO3调整电解液组成,对ZAlSi12Cu2Mg1合金进行微弧氧化。利用涡流测厚仪、XRD、SEM、EDS对氧化膜进行表征。结果表明:Li2CO3含量从4.0g/L增加到6.0g/L,膜层厚度从71μm增加到126μm;微弧氧化过程中,随氧化时间的延长电流呈下降趋势,且随着Li2CO3含量的增多,电流下降速率增大;SEM分析可知,随Li2CO3加入量的增加试样表面氧化膜的粗糙程度先降低后增加,膜层表面微孔数量减少,孔径增大,呈现出的熔融状态更为明显;XRD分析表明,氧化膜主要由Mullite和Al2O3相组成。由EDS分析可知,氧化膜表面主要分布有O、Al和Si及少量的Na和Mg元素。
Li2CO3 was added to the Na2SiO3 + NaOH electrolyte system to adjust the electrolyte composition, and the micro-arc oxidation of ZAlSi12Cu2Mg1 alloy was carried out. The oxide films were characterized by eddy current thickness measurement, XRD, SEM and EDS. The results show that the content of Li2CO3 increases from 4.0g / L to 6.0g / L, and the thickness of the film increases from 71μm to 126μm. During the micro-arc oxidation, the current decreases with the increase of oxidation time. With the increase of Li2CO3 content, The rate of current drop increases. The SEM analysis shows that with the increase of Li2CO3 content, the roughness of the oxide film on the surface of the sample first decreases and then increases, the number of micropores on the surface of the film decreases, the pore diameter increases and the melted state becomes more obvious. XRD analysis shows that the oxide film mainly consists of Mullite and Al2O3 phases. EDS analysis shows that the oxide film surface is mainly distributed O, Al and Si and a small amount of Na and Mg elements.