Ultra‐Robust Superhydrophobic Anti‐Corrosion and Anti‐Icing Coating Armored by Large‐Scale Silica Sand (SS) Skeleton Structure

Abstract Superhydrophobic materials present a promising solution for mitigating corrosion and low‐temperature icing challenges. However, inadequate mechanical stability and durability continue to impede their real‐world deployment. In this study, a large‐scale silica sand (SS) armored triple‐layered superhydrophobic coating with ultra‐robustness is constructed. The coating consists of epoxy resin (EP) layer, large‐scale silica sand (SS) particles layer, and superhydrophobic fluorinated Kaolin@glass fiber@EP (F‐KL@GF@EP) layer. The prepared triple‐layered superhydrophobic EP/SS/F‐KL@GF@EP coating demonstrates remarkably enhanced mechanical stability, maintaining its superhydrophobicity after 2750 sandpaper abrasion cycles, 2700 g sand impact, 270 min continuous water dripping impact, and 1600 tape‐peeling cycles. Additionally, the coating presents unique self‐cleaning, liquid repellency, anti‐corrosion, and anti‐icing properties. The charge transfer resistance (R ct ) of the prepared SS armored triple‐layered superhydrophobic coating increases by nine orders of magnitude, indicating its superior corrosion‐resistant performance. Durable anti‐corrosion performance is maintained even after 35 days of immersion in a 3.5 wt.% NaCl aqueous solution. Furthermore, the SS armored superhydrophobic coating effectively slows heat conduction, significantly delaying the freezing time of dyed water droplets on its surface. The mechanically robust, corrosion‐resistant, and anti‐icing superhydrophobic coating developed in this study exhibits strong potential for real‐world applications.