This study aimed to prepare a superhydrophobic coating by applying low surface energy (LSE) materials to a rough surface, intending to achieve a corrosion-resistant coating. Polyurethane (PU) and fluorinated polyurethane (FPU) were synthesized via designed routes as LSE materials. Arc-sprayed aluminum (Al) coatings and 316L stainless steel substrates (316L SS) were used as the rough and smooth surfaces, respectively. The synthesized PU/FPU coatings were formed on the Al coatings and 316L SS, and their hydrophobicity and corrosion resistance were evaluated. The water contact angle test showed that the content of the fluorine and the concentration of the PU/FPU could affect the hydrophobicity of the surface. In addition, superhydrophobicity was achieved via applying FPU to a rough Al coating surface (Al-FPU coating). Furthermore, the Al-FPU coating also exhibited better corrosion resistance than that of the PU and the pure Al coatings according to Tafel polarization curves and electrochemical impedance spectra in artificial seawater. The results suggested that surface energy and surface roughness were correlated with hydrophobicity, and the modification via fluorinating can be an effective method to achieve superhydrophobicity and corrosion resistance for thermal-sprayed coatings.

本研究旨在通过将低表面能 (LSE) 材料应用于粗糙表面来制备超疏水涂层，以实现耐腐蚀涂层。聚氨酯 (PU) 和氟化聚氨酯 (FPU) 通过设计路线合成为 LSE 材料。电弧喷涂铝 (Al) 涂层和 316L 不锈钢基材 (316L SS) 分别用作粗糙和光滑表面。在Al涂层和316L SS上形成合成的PU/FPU涂层，并对其疏水性和耐腐蚀性进行评价。水接触角测试表明，氟的含量和PU/FPU的浓度会影响表面的疏水性。此外，通过将 FPU 应用到粗糙的 Al 涂层表面（Al-FPU 涂层）来实现超疏水性。此外，根据 Tafel 极化曲线和人造海水中的电化学阻抗谱，Al-FPU 涂层也表现出比 PU 和纯 Al 涂层更好的耐腐蚀性。结果表明，表面能和表面粗糙度与疏水性相关，通过氟化改性是实现热喷涂涂层超疏水性和耐腐蚀性的有效方法。