为了研究添加Al2O3微粉对AZ31A镁合金微弧氧化膜特性影响,在不同浓度Al2O3微粉氧化液中对其进行了微弧氧化处理.利用扫描电镜(SEM)观察了微弧氧化膜形貌,能谱仪(EDS)分析了膜层表面Ca、Mg、O、Al元素分布,X射线衍射仪(XRD)分析了相组成,测定了膜厚、硬度和氧化液中Al2O3表面电荷,讨论了改性机理.结果表明,加入Al2O3微粉后,氧化电压随Al2O3添加量增加先增加后降低;氧化膜表面孔洞数量和尺寸减小,膜层表面Ca元素分布逐渐减少,成膜效率降低,膜层致密度和表面疏松层硬度提高,氧化膜主要由MgO和MgO4等相组成.
AZ31A magnesium alloy was treated by micro-arc oxidation in Al2O3 micro powder electrolyte of different concentrations to research the effects of Al2O3 micro powder addition amount on characteristics of the micro-arc oxidation coating on AZ31A.Surface morphologies of the coating was observed by SEM.Ca,Mg,O and Al element distribution was analyzed by EDS and phase composition of the coating were analyzed by XRD.Thickness and hardness of the micro-arc oxidation coating and surface charge of Al2O3 micro powder in electrolyte were measured.The modification mechanism was discussed.The results show that the oxidation voltage rises firstly and then declines gradually with Al2O3 micro powder amount increasing.The number and size of holes decrease,as well as distribution of Ca element on oxidation coating surface.Film formation efficiency declines,while the compactness of the coating and the hardness of surface porosity layer increase.The oxidation coating is mainly composed of MgO and MgO4 phase.
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