稀土对镁合金微弧氧化层的作用综述

发布时间：2019-08-09 17:38

【摘要】：镁合金具有密度小、比强度高、可回收、优异的铸造性能和切削加工性能等特点,在航空航天、交通工具、3C产品等领域具有十分广泛的应用前景。然而,镁合金的耐蚀耐磨性能差,限制了其更广泛应用。采用微弧氧化技术处理镁合金表面,来提高镁合金的耐蚀耐磨性能是近几年新兴的表面技术。在微弧氧化过程中,镁合金表面不断地陶瓷化,最终获得与镁合金基体结合紧密的致密耐蚀耐磨陶瓷层。本文介绍了镁合金微弧氧化反应原理,综述了稀土对镁合金微弧氧化层作用形式,包括前处理、作为添加剂添加在电解液中以及稀土合金化方式。探讨了稀土对镁合金微弧氧化层的影响作用,稀土通过影响微弧氧化过程、改变微弧氧化层的形貌和提高耐蚀相比例来改善微弧氧化层的耐磨耐蚀性能。指出今后可能的研究方向,通过选择电导率合适、降低Mg O熔点和粘度的稀土盐添加剂,从而提高微弧氧化膜层的致密性和耐蚀相比例,有利于镁合金微弧氧化层性能的改善。
[Abstract]:Magnesium alloy has the characteristics of low density, high specific strength, recyclability, excellent casting performance and cutting performance, and has a wide range of application prospects in aerospace, transportation, 3C products and other fields. However, the corrosion and wear resistance of magnesium alloys is poor, which limits its wider application. It is a new surface technology in recent years to improve the corrosion and wear resistance of magnesium alloys by using micro-arc oxidation technology to treat the surface of magnesium alloys. In the process of micro-arc oxidation, the surface of magnesium alloy is continuously ceramic, and finally a dense corrosion-resistant and wear-resistant ceramic layer tightly bonded to the matrix of magnesium alloy is obtained. In this paper, the principle of micro-arc oxidation of magnesium alloys is introduced, and the forms of action of rare earth on micro-arc oxidation layer of magnesium alloys are reviewed, including pretreatment, addition of rare earth as additives in electrolyte and rare earth alloying. The effect of rare earth on micro arc oxidation layer of magnesium alloy was discussed. Rare earth improved the wear resistance and corrosion resistance of micro arc oxide layer by affecting the process of micro arc oxidation, changing the morphology of micro arc oxide layer and increasing the proportion of corrosion resistant phase. It is pointed out that the possible research direction in the future is to improve the compactness and corrosion resistance of the micro-arc oxide film by selecting the rare earth salt additive with suitable conductivity and reducing the melting point and viscosity of Mg O, which is beneficial to the improvement of the properties of the micro-arc oxide layer of magnesium alloy.
【作者单位】：北京有色金属研究总院科技信息研究所;北京有色金属研究总院国家复合中心工程中心;
【基金】：国家科技部重点研发计划项目(2016YFB0301001)资助
【分类号】：TG174.451

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