Superhydrophobic coating based on organic/inorganic double component adhesive and functionalized nanoparticles with good durability and anti-corrosion for protection of galvanized steel

The excellent wetting resistance properties of superhydrophobic materials mean that they have a wide range of potential applications. However, there are problems that need to be solved urgently regarding mechanical stability, corrosion resistance and complex synthesis. Herein, we prepared a robust and durable superhydrophobic coating using an inorganic aluminum phosphate (AP) adhesive. This contained organic polydimethylsiloxane (PDMS) and silica/halloysite composite nanotubes (HNTs) modified with 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFDTES). The as-prepared F-SiO 2 /HNTs-AP@PDMS coating shows good superhydrophobicity (water contact angle = 158°), mechanical strength and durability. Superhydrophobicity was maintained even after 150 complete sandpaper wear cycles and 200,000 water droplet impact measurements. In particular, electrochemical impedance spectroscopy (EIS) results showed that the R ct value of the superhydrophobic coating was significantly increased by five orders of magnitude. After exposure to a corrosive environment for 10 days, the R ct value is still far higher than that of uncoated galvanized steel , indicating that it provides excellent long-term protection for metals. We believe this work not only provides a reference for the large-scale preparation of superhydrophobic materials, but also provides a strategy for the long-term protection of galvanized steel.