镁合金材料表面处理技术研究新动态

发布时间：2018-04-25 20:54

本文选题：镁合金 + 超疏水　；参考：《表面技术》2017年03期

【摘要】：对镁合金材料近年来在表面微弧氧化、表面超疏水膜层、激光表面改性以及溶胶-凝胶涂层四个方面的研究动态进行了简要综述。镁合金材料采用双极性和混合(单极和双极的组合)电流模式微弧氧化处理的膜层生长速率较快,膜层更致密且硬度更高,膜层的耐磨性和耐腐蚀性能更好。在高浓度苛性碱为主的强碱性溶液中添加适量的添加剂,经短时间(~3 min)微弧氧化处理,即可获得中性盐雾试验达200 h以上的致密耐腐蚀膜层。采用水热法、电化学刻蚀、微弧氧化和电沉积等方法,可在镁合金材料表面形成具有微纳米多级结构的粗糙表面,再用低表面能物质对粗糙表面进行修饰,可在镁合金表面获得超疏水膜层,从而提高镁合金的耐腐蚀性能。镁合金材料激光表面改性处理可改善其表面成分,细化晶粒,使组成相分布更均匀以及提高表层的固溶度极限,从而提高镁合金材料的耐腐性能、摩擦磨损抗力和疲劳强度。溶胶-凝胶有机/无机杂化涂层与镁合金基材良好的附着力,不仅可提高镁合金的耐腐蚀性能,还可以使镁合金具有抗氧化、耐磨损、防水性以及其他性能。
[Abstract]:In this paper, the recent progress in microarc oxidation, superhydrophobic coating, laser surface modification and sol-gel coating of magnesium alloy is briefly reviewed. The coating of magnesium alloy treated by bipolar and hybrid (unipolar and bipolar combination) current-mode micro-arc oxidation has faster growth rate, denser and higher hardness, and better wear resistance and corrosion resistance. A dense corrosion resistant film with neutral salt spray test for more than 200 h can be obtained by adding a proper amount of additive in a strong alkaline solution with high concentration of caustic base and treated with micro-arc oxidation for a short time of 3 min. By means of hydrothermal method, electrochemical etching, micro-arc oxidation and electrodeposition, the rough surface with multi-level structure can be formed on the surface of magnesium alloy, and then the rough surface can be modified with low surface energy material. Superhydrophobic coatings can be obtained on the surface of magnesium alloys, thus improving the corrosion resistance of magnesium alloys. Laser surface modification of magnesium alloy materials can improve the surface composition, refine the grain size, make the phase distribution more uniform and increase the solution limit of the surface layer, thus improving the corrosion resistance, friction and wear resistance and fatigue strength of magnesium alloy materials. The good adhesion between sol-gel organic / inorganic hybrid coating and magnesium alloy substrate can not only improve the corrosion resistance of magnesium alloy, but also make magnesium alloy have oxidation resistance, wear resistance, waterproofing and other properties.
【作者单位】：上海交通大学轻合金精密成型国家工程研究中心;
【基金】：国家自然科学基金项目(51371116) 航天先进技术联合研究中心技术创新项目(USCAST2013-23) 江苏省科技成果转化项目(BA2016039)~~
【分类号】：TG174.4

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