Spray‐Driven Corrosion‐Resistant Superhydrophobic Coating With Multiscale Particles Reinforcement and Its Applicability to Various Environments

Abstract

Insufficient mechanical strength and tedious preparation processes of corrosion‐resistant superhydrophobic coatings have long restricted their practical application. In this work, a superhydrophobic coating is proposed through the incorporation of multiscale micro‐glass fiber (GF)/micro‐TiB 2 /nano‐TiO 2 particles into soft membrane polydimethylsiloxane (PDMS)@polyurethane (PU) via a single‐step spraying method. The strategy of multiscale structure design can effectively enhance the robustness of superhydrophobic coatings from six aspects: GF weaving reinforcement, TiB 2 as “hard” micro‐skeletons, TiO 2 as wear‐resistant bearing points, PDMS as modifier as well as a molecular binder, PU providing an interface‐strengthening effect, and soft membrane as a stress‐buffering medium. Consequently, the optimized coating with water contact angle (WCA) of 165.0° ± 1.8° and sliding angle (SA) of 5.0° ± 1.2° possesses robust superhydrophobicity and remarkably multi‐functional characteristics. Typically, the coating exhibits superior anti‐corrosion performance with impedance modulus (| Z | 0.01Hz ) up to 4.0 × 10 5  Ω·cm 2 at low frequencies and corrosion protection efficiency of 97.2% in 3.5 wt.% NaCl solution.