微纳米颗粒添加剂在镁合金微弧氧化涂层中的应用研究现状  

Research Status of Application of Micro-Nano Additives in Micro-Arc Oxidation Coatings Formed on Magnesium Alloys

作　　者：雍家惠 李宏战[2,3] 李争显 王毅飞 耿娟娟[2,3] Yong Jiahui;Li Hongzhan;Li Zhengxian;Wang Yifei;Geng Juanjuan(School of Material Science and Engineering,Northeastern University,Shenyang 110819,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China,Rare Materials Surface Engineering Technology Research Center of Shaanxi Province,Xi’an 710016,China)

机构地区：[1]东北大学材料科学与工程学院,辽宁沈阳110819 [2]西北有色金属研究院,陕西西安710016 [3]陕西省稀有金属材料表面工程技术研究中心,陕西西安710016

出　　处：《稀有金属》2021年第10期1230-1240,共11页Chinese Journal of Rare Metals

基　　金：陕西省科技重大专项项目(2020zdzx04-03-02);陕西省科技重大专项项目(2020zdzx04-03-02)资助。

摘　　要：镁合金由于其密度低等优势受到研究者的广泛关注。然而,镁自身化学性质活泼且其表面自然生成的氧化膜疏松多孔,无法有效保护镁基体,严重的腐蚀、磨损等问题限制了镁合金在工业中的应用,而对镁合金进行表面改性可进一步拓宽镁合金的使用范围。微弧氧化(MAO)技术作为一种有效的表面改性技术,可在镁合金表面制备耐磨、耐蚀等特性的陶瓷涂层。电解液的化学成分被认为是影响镁合金陶瓷涂层性能的重要因素之一,通过加入微纳米颗粒添加剂调整电解液的化学成分可获得性能更加优异的陶瓷涂层。综述了近年来微纳米颗粒添加剂对镁合金微弧氧化陶瓷涂层的微观结构、涂层厚度、相组成的影响,以及含有微纳米颗粒添加剂涂层腐蚀行为和磨损行为的变化,简要介绍了微纳米颗粒添加剂嵌入微弧氧化涂层的机制,并展望了该领域未来的发展方向。Magnesium alloys are highly utilized in aviation,aerospace,automotive industries,military and electronic industries,due to their advantages of low density,high ratio of strength-to-weight,good electromagnetic shielding and excellent dimensional stability.How‐ever,the chemical properties of magnesium are very active,and the standard electrode potential is-2.36 V(vs.SCE),which leads to poor corrosion resistance of magnesium alloys and makes then prone to severe corrosion in corrosive media.Moreover,when magnesium alloys are exposed to natural environments,the produced oxide films(MgO)are loose and porous,and the pilling-bedworth ratio of oxida‐tion on the magnesium alloy(PBR)value of the oxide films is 0.81(<1),and the protection ability of the substrate is poor.As an emerg‐ing surface treatment technology,micro-arc oxidation technology can prepare corrosion-resistant and wear-resistant coatings on the sur‐face of magnesium alloys,and is widely used in the surface modification of magnesium alloys.However,during the formation of the mi‐cro-arc oxidation coatings,micro-porous discharge channels will be formed in the coatings due to arc discharge,which will lead to the ad‐sorption and accumulation of corrosive media in the coatings,it is not conducive to the improvement of the coating performance.Recent studies have shown that the performance of the micro-arc oxidation coatings is mainly affected by the electrolyte system(silicate,alumi‐nate,phosphate,zirconium salt),electrical parameters(power mode,voltage,current density,duty cycle,frequency),oxidation time and other factors.In the process of micro-arc oxidation,the electrolyte components will participate in the coating-forming reactions to ad‐just the phase composition and microstructure of the coatings,and improve the performance of the coatings.Therefore,recent develop‐ments in this area are focused on adjusting the composition of the micro-arc oxidation electrolyte through additives,aiming at improving the microstructure and comprehensive perfo

关 键 词：镁合金 微弧氧化 添加剂 耐蚀性 耐磨性 

分 类 号：TG174.4[金属学及工艺—金属表面处理]