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10g/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.
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