AZ91D镁合金微弧氧化膜生长方式的多维探讨

发布时间：2018-01-17 00:31

本文关键词：AZ91D镁合金微弧氧化膜生长方式的多维探讨　出处：《中国有色金属学报》2015年03期 　论文类型：期刊论文

【摘要】：在硅酸盐体系电解液中对AZ91D镁合金进行微弧氧化处理,使用电子外径千分尺、涡流测厚仪、扫描电子显微镜(SEM)以及电子探针显微分析仪(EPMA)对试样尺寸、膜层厚度、微观形貌及所含元素的分布进行检测,采用分界区直接观察法、全基体直接测量法和膜层宏观测量计算法3种方法研究膜层的生长方式。结果表明:第一种方法从膜层截面中直接观察到镁合金微弧氧化膜的确存在向内、向外生长的现象,为膜层的生长方式提供了直观的证据;第二种方法直接、直观地对基体和膜层的尺寸变化同时进行观察与测量,同样揭示存在膜层同时向内、向外生长的现象,且膜层向外的生长速率大于向内的;第3种方法的结果再次表明膜层存在向内、向外生长的现象,并且不同时间下膜层向外生长的尺寸均大于向内的尺寸,但膜层整体的生长速率逐步降低。
[Abstract]:AZ91D magnesium alloy was treated by micro-arc oxidation in the electrolyte of silicate system. The micrometer of electron outer diameter was used to measure the thickness of AZ91D magnesium alloy. Scanning electron microscope (SEM) and EPMA (electron probe microanalyzer) were used to detect the sample size, film thickness, micromorphology and the distribution of the elements. The direct measurement of the whole substrate and the macroscopic measurement of the film layer were used to study the growth mode of the film. The results showed that the first method directly observed that the micro-arc oxide film of magnesium alloy did exist inward from the section of the film. The phenomenon of outward growth provides intuitionistic evidence for the growth mode of the film. The second method directly and intuitively observed and measured the size changes of the substrate and the film layer at the same time. It also revealed the phenomenon of the film growing in and out at the same time, and the growth rate of the outer film was larger than that of the inner one. The results of the third method again show that the film grows inward and outward, and the size of the film growing outward is larger than that of the film at different times, but the growth rate of the whole film decreases gradually.
【作者单位】：兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室;
【基金】：甘肃省创新研究群体计划资助项目(1111RJDA011)
【分类号】：TG174.4
【正文快照】： 微弧氧化,又称等离子电解氧化、电火花阳极氧化以及微等离子氧化,是一种应用于镁、铝和钛等轻金属的表面处理技术。与其他现有的表面处理技术相比,微弧氧化处理具有许多优点,如均镀能力强、电解液环境友好、较少或不需要前处理,所得膜层具有优良的绝缘性、耐蚀性和耐磨性[1-3]

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