(1. 北京工商大学 材料与机械工程学院，北京 100048；
2. 大连海事大学 交通运输装备与海洋工程学院，大连 116026)
摘 要: 利用微弧氧化技术在镁合金表面制备微米级粗糙结构，采用环氧树脂溶液和纳米二氧化硅分散液对该表面进行涂覆处理，再利用全氟硅烷改性，制备得到具有超疏水性的复合膜层。采用扫描电镜、X射线衍射仪、接触角测量仪、高速摄影系统和电化学工作站评价膜层的形貌结构、润湿性和耐蚀性。结果表明：微弧氧化层所具有的微米级结构和纳米二氧化硅颗粒组成的微/纳二元粗糙结构对疏水性的提高具有重要作用；复合膜层表面的接触角随二氧化硅分散液浓度的提高呈现先增加后减小的趋势，并最终逐渐稳定在150°左右；当二氧化硅分散液溶度为10 g/L时，复合表面的接触角最大可达161°。同时该表面对水滴呈现低黏附特性。动电位极化曲线表明：与镁合金基底相比，微弧氧化层和复合膜层的耐蚀性提高2~3个数量级。
关键字: 镁合金；超疏水；微弧氧化；纳米二氧化硅；微/纳二元结构；
（1. School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China;
2. Transportation Equipments and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China）
Abstract:Micron scale rough structures on magnesium alloy substrate surface were acquired by micro-arc oxidation technique. Nanoscale rough structures on the surface of micro-arc oxidation coating were prepared by painting epoxy acetone solution and silica suspension subsequently. Superhydrophobic duplex-treated film was fabricated by perfluorodecyltrichlorosilane self-assembled monolayers deposited on micro-nanostructures. Scanning electron microscope, X-ray diffractometer, contact angle measurement, high-speed camera system and electrochemical workstation were used to analyze the surface morphology, wettability and corrosion resistance of films. The results indicate that micro- and nanostructures of micro-arc oxidation and nano-silica play an important role on preparing superhydrophobic surface. The contact angles on duplex-treated film increase initially, and then reduce with increasing the concentration of silica suspension, and finally stabilize at around 150° gradually. The maximum contact angle of 161° is acquired when the concentration of silica suspension is 10 g/L. And the films possess the characteristics of low adhesion. The potentiodynamic polarization curves indicate that, comparing to the bare magnesium alloy, the corrosion resistance of micro-arc oxidation coating and duplex-treated film increases significantly by 2-3 orders of magnitude.
Key words: magnesium alloy; superhydrophobic; micro-arc oxidation; nano-silica; micro-nano binary structure
