钢铁表面超疏水膜的制备与表征

采用水热法结合氟硅烷修饰直接在钢铁表面制备超疏水膜。疏水膜的疏水性与钢铁基底的微纳米结构有重要关系。结果表明,以乙二胺为溶剂,经140℃水热反应4h和160℃水热反应5h,可以在钢铁表面制得具有次级网状结构的正八面体、花状等微纳米精细结构,再经氟硅烷修饰后表现出良好的超疏水性,与水滴的接触角分别达到156.49和165.31°。XRD的分析结果表明,该微纳米结构的主要成分是Fe3O4,它的形成一方面提供了制备超疏水表面所必须的微纳米精细结构,另一方面又为与氟硅烷发生反应生成牢固的薄膜创造了条件。电化学分析结果表明,超疏水膜层的存在显著降低了钢铁基底的腐蚀倾向。

Fabrication and characterization of superhydrophobic films on steel substrate

Superhydrophobic films were prepared on steel substrate using hydrothermal method combined with modification of fluorinated silane.The hydrophbility of hydrophobic films is related to the micro-nano fine structures of the steel substrate.The results showed that octahedron-like,flower-like micro-nano hierarchical structures had grown on steel surface,which were fabricated by hydrothermal reactions in an ethylenediamine solution at 140℃ for 4h as well as at 160℃ for 5h.After modified by fluorinated silane,the treated surface exhibited superhydrobicity with water contact angles of 156.49 and 165.31°,respectively.The result of X-ray diffraction pattern indicated that the main component of the micro-nano structure was Fe3O4.The formation of Fe3O4 provides micro-nano fine structures that is necessary to prepare hydrophobic surface,and provides conditions which tight films were formed by reacted with fluorinated silane.Electrochemical tests showed that the anti-corrosion property of steel was improved effectively by the superhydrophobic films.