Пороговый эффект деградации супергидрофобных покрытий, вызванный воздействием озона

It is shown that the use of nanosecond pulsed laser processing of an aluminum alloy makes it possible to obtain a coating with a multimodal roughness. The coating consists mainly of micro- and nanoparticles of aluminum oxide. Subsequent vapor deposition of the hydrophobic agent provides a coating with superhydrophobic properties. Infrared (IR) reflectance spectroscopy has been used to study the effect of ozone on the properties of a superhydrophobic coating fabricated on the surface of an aluminum alloy. At times of exposure to ozone (with a concentration of 50 mg/m3) not exceeding 250 min, the effect of degradation of the coating was practically indetectable, which is associated with self-recovery of the coating performance during the ozonation process. At longer times, exposure to ozone leads to irreversible degradation of the superhydrophobic coating, which is mainly due to the desorption of the hydrophobic part of the fluorooxysilane molecule upon rupture of bonds of the Si-C type, as well as the adsorption of ozone on the textured surface.