Preparation and properties of organofluoroacrylic resin/SiO2 superhydrophobic coating

Abstract

In order to improve poor mechanical properties and easy corrosion of superhydrophobic coatings, one performance organofluoroacrylic resin/SiO2 superhydrophobic coating was prepared by spraying method with organofluoroacrylic resin and 1H, 1H, 2H, 2H-perfluorodecyltrimethoxysilane modified nano-SiO2 as raw materials. The influence of nano-SiO2 modification conditions was discussed on the wet ability of modified nano-SiO2, and the drag reduction performance, anti-corrosion performance and wear resistance of the coating were evaluated by pipeline resistance experiment, electrochemical workstation and friction experiment. The results show that the surface of the organofluoroacrylic resin/SiO2 superhydrophobic coating has a multi-stage rough structure with good superhydrophobic properties, and the contact angle of the superhydrophobic coating sprayed on the stainless steel and aluminum alloy substrates is slightly smaller than that of the glass substrate. The surface of the coating has the slipping under a certain flow rate, and the drag reduction rate of the superhydrophobic coating with a ratio of 1∶1 is high, reaching 24.54%. At the same time, through the polarization curve and AC impedance analysis, the current density of the dimensional passivity decreases greatly, which has a good anti-corrosion protection effect on stainless steel, and the coating has good corrosion resistance. In addition, the coating has relatively good wear resistance on stainless steel and aluminum alloy substrates, and is still superhydrophobic after 12 cycles of friction.

Keywords

• spraying method
• superhydrophobic
• drag reduction
• corrosion resistance
• wear resistance