有机-无机自组装制备类荷叶结构超疏水涂层及其性能研究

Fabrication and Anticorrosion Property of Superhydrophobic Surfaces with Hierarchical Structure through an Organic-inorganic Self-assemble Process

以γ-氨丙基三乙氧基硅烷(硅烷偶联剂KH550)为连接剂,利用硅氧烷水解形成硅羟基的自组装功能,将聚四氟乙烯(PTFE)烧结形成的纳米级纤维与硅氧烷团聚的微米级粒子结合,制备了具有类荷叶表面形貌的超疏水涂层,其静态水接触角达152°,滚动角约为5°.通过扫描电镜观察涂层的表面微观形貌,发现该涂层具有微/纳米二级结构.利用Cassie方程,探讨了表面微观结构和涂层疏水性能之间的关系.用电化学交流阻抗谱(EIS)分析覆有涂层的试样在模拟腐蚀环境下的腐蚀行为,结果表明该试样的腐蚀电流比裸钢片降低了3～4个数量级,说明该涂层具有较好的防腐性能。

A superhydrophobic surface was obtained by using γ-aminopropyltriethoxylsilane（KH550） as a linker from organic-inorganic self-assemble process.By utilizing silane with amine functional group and Si-hydroxy functional group,bionic superhydrophobic surfaces with hierarchical microsphere/nanofiber structures were prepared on metal surfaces.The corrosion behavior of the composite film was investigated by electrochemicial impedance spectroscope（EIS）.The maximal contact angle for water on the composite film is about 152°.Scanning electron microscope（SEM）.Test result shows that the lotus-like film has microsphere/nanofiber hierarchical structure.The surface of the film forms a composite framework which plays an essential role in trapping air between the solid substrate and the liquid droplets to get high contact angle and low roll angle.Electrochemical corrosion measurements results indicate that the composite film has excellent corrosion protection for mild steel.The corrosion current of mild steel is nearly 1×10^4 times than that of the sample coated with the composite film,while the corrosion impedance increases dramatically.It suggests that the superdrophobic film has good corrosion resistance.