钢铁表面超疏水膜的制备与表征

Fabrication and characterization of superhydrophobic films on steel substrate

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。

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 Fe304. The formation of Fe3 04 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.