关键词: 超疏水表面, 防覆冰, 接触角, 腐蚀, 纳米结构

Abstract: The superhydrophobic surface has good anti-icing properties and is expected to improve the reliability of facilities under low temperature conditions. Micro-nano structures were fabricated on the copper surfaces by chemical etching with ammonia gas, after modification by the low surface energy material fluoroakylsilane (FAS), the copper surfaces exhibited superhydrophobic properties, with a water contact angle of about 152.1°. The wettability, the surface micro-structure and the anti-icing behavior of the copper surfaces were investigated by means of contact angle measurement, SEM, and freezing experiments, respectively. The results indicate that, the anti-icing and anti-frosting performers of the superhydrophobic surfaces are not only depend on the surface roughness, but also relate to the state of the droplets on the surface, if the droplets on the superhydrophobic surfaces are in the Cassie model, the contact area between the droplets and the surfaces are small, the copper surfaces have good anti-icing and anti-frosting properties. While the droplets on the copper hydrophobic surfaces are in the Wenzel model, the frost layer grows faster as the contact area between the frost crystal and the solid surfaces increased, and the frost resistances of the copper surfaces decrease significantly.

Key words: superhydrophobic surface, anti-icing, contact angle, corrosion, nanostructure