摘要
采用正交试验方法对镁合金硅酸盐体系的微弧氧化处理工艺进行优化,采用SEM、EDS、XPS和XRD对微弧氧化膜的微观成分与结构进行了表征,进而分析探讨了电解液成分及氧化参数对镁合金表面膜粘接性能的影响规律。研究结果表明,所研究的几种工艺参数对AZ31镁合金表面的粘接性能的影响程度从小到大排列为:KOH的浓度<频率<Na2B4O7的浓度<占空比。微弧氧化处理后的镁合金试样在3.5%NaCl溶液中的开路电位提高约200mV,其表面微弧氧化膜主要由MgO和MgSiO3组成。经优化工艺微弧氧化处理后,镁合金胶接件的拉剪强度可达约24MPa,比未氧化处理的提高近90%。氧化工艺参数对氧化膜成分的影响不大,主要影响膜层的表面形貌,进而影响镁合金粘接件的粘接强度。
The microarc oxidation process as a pre-treatment for adhesive bonding of AZ31 magnesium alloy was optimized by orthogonal test, and the influences of process parameters on lap-shear strength were studied. The micrographs and compositions of the microarc oxidation films were characterized by SEM. EDS, XRD. XPS. The results show the influence degree of the parameters on adhesive strength is as following： [KOH] 〈frequency〈 [Na2B4O7] %duty cycle. The open circuit potential of AZ31 magnesium alloy in 3. 5% NaCI solution is raised by 200mV after microarc oxidation. The microarc oxidation film consist mainly of MgO and MgSiO3. By the optimized microarc oxidation process, the lap-shear strength of AZ31 magnesium alloy joints can increase by about 900//oo and reach about 24MPa. The lap-shear strength is mainly influenced by the surface morphology of the films, not their compositions.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2012年第2期76-79,共4页
Materials Reports
基金
教育部科学技术研究重点资助项目(108129)
关键词
AZ31镁合金
微弧氧化
正交试验
粘接强度
AZ31 magnesium alloy, microarc oxidation, orthogonal test, lap-shear strength
