镁合金微弧氧化膜致密化技术研究进展

Research advance in densification for micro-arc oxidation film on magnesium alloy

镁合金作为轻质结构材料,在装备轻量化领域展示了巨大的应用潜力。由于镁合金的化学活性较高,表面生成的氧化膜疏松多孔,严苛的服役环境对其长效稳定性构成严重威胁。采用表面防护技术有效提升镁合金的耐蚀性,延长其使用寿命。在镁合金表面改性防护技术中,微弧氧化技术具有显著的技术特征,被认为是最有前景的镁合金表面防护技术之一。然而镁合金微弧氧化膜存在本质的多孔结构特征,影响膜的防护效果。为扩大镁合金的应用领域,需要对微弧氧化膜进行致密化处理。本文综述了镁合金微弧氧化膜致密化技术的发展概况,总结了微弧氧化膜致密化技术的主要策略,以期为高致密镁合金微弧氧化膜的设计提供理论指导。最后,对镁合金微弧氧化膜致密化技术的未来发展趋势进行了展望。

Magnesium alloy,as a lightweight structural material,has shown great potential for applica‐tion in the field of equipment lightweight.While Mg alloy has high chemical activity,and the generated oxide film of surface has loose pores,harsh service environment poses a serious threat to their longterm stability.Surface protection technology effectively enhances the corrosion resistance of magnesium alloy and extends their service life.In the surface modification and protection technology of magnesium alloy,micro-arc oxidation technology has significant technical characteristics and is considered as one of the most promising surface protection technologies for Mg alloy.However,the micro-arc oxidation film on Mg alloy has inherent porous structure,which affects protective effect of film.To expand the application of Mg alloy,it is necessary to densify micro-arc oxidation film.This article provided an overview of the development of densification for micro-arc oxidation film on Mg alloy,and summa‐rized the main strategies for densification,aiming to provide theoretical guidance for designing densi‐fied micro-arc oxidation film on Mg alloy.Finally,the future development direction of densification for micro-arc oxidation film on Mg alloy was discussed.