Superhydrophobic coatings are widely used in many fields because of their self-cleaning, anti-icing, anti-corrosion and oil-water separation properties. Conventionally, superhydrophobicity is defined as possessing a water contact angle above 150° and a sliding angle below 10°. A superhydrophobic surface is produced either by creating a rough surface on a hydrophobic material or by modifying a rough surface using materials having a low surface free energy. To consider the practical application of superhydrophobic coating, we prepared a micro-nanoscale flowerlike superhydrophobic coating using a surface treatment method. In our work, the monodisperse SWCNTs can be obtained using a non-covalent PVP dispersant under the graded homogenization method. We incorporate low amounts of 0.15wt%SWCNTs into fluorocarbon (FC) coatings to fabricate composite coatings. The micro-nano structure surface with micron level smooth and nanometer level rough was constructed by ZnO particles after surface treatment. The contact angle of composite coating was 152.5° and a sliding angle was 5°, and the bionic superhydrophobic coating with integrated functions was fabricated. The result suggests that the combination of the rough structures achieved by the flower-like ZnO and low surface energy provided by stearic acid modification results in superhydrophobicity and a very low sliding angle. The network structure formed by SWCNTs and the conductive grid chain formed by ZnO effect the antistatic properties, the resistivity is 3.15Ωm. The superhydrophobic surface and the three-dimensional cross-structure of the ZnO/ SWCNTs/FC composite coating can delay the corrosion. The corrosion current density of the composite coating is 9.66×10^-8 A/cm², which is 3 orders of magnitude lower than that of Q235 steel. The ZnO/ SWCNTs/FC composite coating could be easily repaired after losing superhydrophobicity by surface treatment. At the same time, the coating has good mechanical stability, acid and alkali resistance, and the integrated characteristics of electrical resistance, corrosion resistance and self-cleaning functions. These coatings can find potential industrial applications in the industry.

Key words: Micro-nano structure, Superhydrophobic coatings, Electrical resistance, Corrosion resistance, Self-cleaning property