功能化纳米TiO2/环氧树脂超疏水防腐复合涂层的制备与性能

超疏水材料在金属防腐领域具备巨大的潜在应用前景。为得到疏水性能及防腐性能俱优的纳米TiO₂/环氧树脂复合涂层材料，首先以三甲氧基十七氟癸基硅烷和γ-氨丙基三乙氧基硅烷(KH550)对纳米TiO₂表面功能化；以全氟辛基甲基丙烯酸酯对固化剂二乙烯三氨(DETA)进行氟化；最后通过一步共混法和两步喷涂法分别制备出两种复合涂层。利用FTIR、XPS、1HNMR分析氟化固化剂(F-DETA)和氟化纳米TiO₂(f-TiO₂)的物相组成和组织结构。接触角测试仪和静置实验表明，当三甲氧基十七氟癸基硅烷和γ-氨丙基三乙氧基硅烷的摩尔比为1∶15时f-TiO₂的性能最佳，所制备的复合涂层接触角达到164.9°。SEM表征结果显示通过两步法制备的f-TiO₂/环氧树脂复合涂层具备更均匀的粗糙表面、涂层内部孔隙率较低且环氧树脂层与f-TiO₂层具备梯度结构。摩擦实验证明两步法制备的f-TiO₂/环氧树脂复合涂层的超疏水性具备较好的机械稳定性。Tafel极化曲线和电化学阻抗谱(EIS)研究表明，通过两步法制备的f-TiO₂/环氧树脂复合涂层具有优异的防腐性能，其腐蚀抑制效率高达99.99%。 

Preparation and properties of functionalized nano-TiO2/epoxy resin superhydrophobic anticorrosive composite coating

Superhydrophobic materials have great potential application prospects in the field of metal anticorrosion. In order to obtain TiO₂/epoxy resin composite coating material with excellent corrosion resistance, firstly, the surface of nano-TiO₂ was modified with trimethoxy heptafluorodecyl silane and γ-aminopropyltriethoxysilane (KH550), and then the diethylenetriamine (DETA) as curing agent was fluorinated with perfluorooctyl methacrylate. Finally, two kinds of composite coatings were prepared by blending method and two-step method respectively. The phase composition and microstructure of fluorinated curing agent (F-DETA) and fluorinated nano TiO₂ (f-TiO₂) were analyzed by FTIR, XPS and 1HNMR. The contact angle tester and static test show that when the molar ratio of trimethoxyheptafluorodecyl silane to γ-aminopropyltriethoxysilane is 1∶15, the performance of f-TiO₂ is the best. The contact angle of the composite coating reaches 164.9°. SEM was used to characterize the micro-morphology of the coating surface and cross-section. The results show that the f-TiO₂/epoxy resin composite coating prepared by two-step method has uniform rough surface, low porosity inside the coating, and gradient structure between epoxy resin layer and f-TiO₂ layer. The friction experiment proves that the super hydrophobicity of f-TiO₂/epoxy resin composite coating prepared by two-step method has certain mechanical stability. Tafel polarization curve and electrochemical impedance spectroscopy (EIS) show that the f-TiO₂/epoxy resin composite coating prepared by two-step method has excellent corrosion resistance, and its corrosion inhibition efficiency is as high as 99.99%.