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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,得到二氧化硅纳米颗粒均匀分布的粗糙表面,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、高速摄影系统评价膜层的形貌结构和润湿性。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趋势,并最终逐渐稳定在150o左右;在二氧化硅分散液浓度为10.0g/L时,复合表面的接触角最大,可达161o,在此条件下获取的复合表面对不同pH值的液滴均具有超疏水性。同时该表面对水滴呈现低黏附特性。
Micro-arc oxidation technology is used to prepare micron-scale rough structure on the surface of magnesium alloy, the surface is coated with epoxy resin solution and nano-silica dispersion to obtain uniform distribution of rough surface of silica nano particles, Fluorosilane modified to prepare super-hydrophobic composite membrane layer. The morphology and wettability of the film were evaluated by scanning electron microscopy, X-ray diffraction, contact angle measurement and high-speed photography. The results show that the microstructure of the micro-arc oxidation layer and the micro / nano binary structure composed of nano-silica particles play an important role in the improvement of hydrophobicity. The contact angles of the surface of the composite film layer vary with the silica dispersion The increase of the concentration initially increased and then decreased, and finally stabilized at about 150o. When the concentration of the silica dispersion was 10.0g / L, the contact angle of the composite surface was the largest, reaching 161o. Under these conditions, The composite surface has superhydrophobicity to the droplets with different pH value. At the same time, the surface shows low adhesion to water droplets.