不同加压方式下镁合金微弧氧化膜结构及耐蚀性的变化规律

发布时间：2018-07-11 16:36

本文选题：镁合金 + 微弧氧化　；参考：《稀有金属材料与工程》2017年06期

【摘要】：在硅酸盐体系电解液中采用恒压、变压两种加压方式对AZ91D镁合金进行不同时间的微弧氧化处理,研究膜层的厚度、表面形貌、物相组成及耐蚀性随时间的变化规律,对膜层中微孔的大小、数量及表面孔隙率进行定量统计,比较两加压方式下膜层的差异。结果表明:两加压方式下,膜层结构随时间的变化规律基本相同,其变化幅度在变压方式下相对较大;随着处理时间的增加,膜层的厚度不断增大,微孔数量不断减少,较大微孔不断增多,表面孔隙率不断增大,而物相组成却不变;恒压方式下膜层的耐蚀性不断增强,变压方式下则先增大后减小;与变压方式相比,恒压方式下膜层生长前期的生长速率较大,更有利于工业化生产。
[Abstract]:AZ91D magnesium alloy was treated by microarc oxidation under constant pressure and variable pressure in silicate electrolyte. The thickness, surface morphology, phase composition and corrosion resistance of AZ91D magnesium alloy were studied. The size, quantity and surface porosity of the micropores in the film were quantitatively analyzed, and the differences between the two pressure ways were compared. The results show that the variation of the film structure with time is basically the same under two pressure modes, and the variation range is relatively large under the variable pressure mode, and the thickness of the film increases and the number of micropores decreases with the increase of the treatment time. The larger micropores are increasing, the surface porosity is increasing, but the phase composition is not changed. The corrosion resistance of the film increases under constant pressure mode, and then decreases under the variable pressure mode, and compared with the variable pressure mode, the corrosion resistance of the film layer increases firstly and then decreases under the constant pressure mode. Under constant pressure, the growth rate of the film layer at the early stage of growth is larger, which is more favorable for industrial production.
【作者单位】：兰州理工大学有色金属先进加工与再利用省部共建国家重点实验室;
【基金】：甘肃省创新研究群体计划(1111RJDA011)
【分类号】：TG174.451

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