摘要
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。
A varying content of Li2CO3 was added into Na2SiO3＋NaOH system base electrolyte. The micro-arc oxidation ceramic coatings were prepared on the surface of ZAISi12Cu2Mg1 alloy in the electrolytes and the coatings were characterized by vortex thickness gauge, XRD, SEM and EDS in this work. The results show that the thickness of oxide film increases from 71 μm to 126 μm with increasing of the content of Li2CO3 from 4.0 to 6.0 g/L. The reverse current decreases with increasing of the oxidation time in the MAO process, and the rate of current decrease accelerates with increasing of the content of LiECO3. It is found by SEM that the roughness of film decrease and then rise, but the size of microspore increase on the surfaces of the film. It is found by XRD that the oxide films were mainly composed of Mullite and Al2O3. The results of EDS analysis indicate that the distribution of chemical elements of the film surface are mainly O, Al and Si, as well as a trace amount of Na and Mg.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2010年第A01期305-310,共6页
Rare Metal Materials and Engineering
基金
内蒙古自治区人才开发基金项目(200805)
