稀土对镁合金微弧氧化层的作用综述  

Effects of Rare Earths on Micro-Arc Oxidation of Magnesium Alloys: A Review

作　　者：马跃宇[1] 何德山[1] 涂思京[1] 车聪[1] 李大全[2] 

机构地区：[1]北京有色金属研究总院科技信息研究所,北京100088 [2]北京有色金属研究总院国家复合中心工程中心,北京100088

出　　处：《稀有金属》2017年第6期709-713,共5页Chinese Journal of Rare Metals

基　　金：国家科技部重点研发计划项目(2016YFB0301001)资助

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。Due to low density, high strength-to-weight ratio, easy recycling, excellent casting and cutting properties, magnesium al- loys have broad application prospects in traffic tools, aerospace, 3C products. However, poor corrosion resistances and wear resistances of magnesium alloys restrict wide applicalions. Micro-arc oxidation was a newly developed technique of dealing with magnesium alloys to improve the corrosion resistances and the wear resistances. During the micro-arc oxidation process, ceramic coatings which were compact and combined with magnesium alloys tightly grew constantly on the surface of magnesium alloys. In this paper, principles of micro-arc oxidation reactions were introduced. Functioning forms of rare earths, including pretreatment, additives in electrolyte and rare earths alloying were reviewed. Effects of rare earths including processing effects, improving morphology and changing phase ratios were discussed. Applying rare earths which had suitable conductivities and could decrease the melting point and the viscosity of MgO might be the future research direction.

关 键 词：稀土 镁合金 微弧氧化 耐腐蚀 

分 类 号：TG146.2[一般工业技术—材料科学与工程]