Superhydrophobic Thin Films from Silica Nanoparticles and Polyfluorosilane and Their Perfect Anticorrosion Properties
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Superhydrophobicity of the surfaces depends on morphology, chemical properties and it’s free energy, thus altering the surface coating properties will improve their hydrophobicity. Many researchs have shown that surfaces contain F-based group or –CF3 groups will creat low energy surface with high contact angles. In addition, studies show that surface roughness also affects the wettability. Therefore the combination of a low free energy surface and an orderly roughness surface will creat a superhydrophobic surface. In this paper, we report the modification method of SiO2 nanoparticles using alkyl fluorosilane to creat superhydrophobic materials with contact angles ≥150o, and combine with polyfluorosilane to fabricate superhydrophobicity thin film for insulating and anticorrosion for metallic surfaces. Analytical methods was used to investigate material’s properties: FTIR, TGA, SEM, TEM. Surface characteristic, mechanical properties of thin films were studied. Wettability of the coating was evaluated using the dynamic contact angle method. The anticorrosion properties of the thi films have been determined by damp heat and salt spray test. The results show that the superhydrophobic thin films have good stabilities and anticorrosion properties.