Durable FEVE‐based slippery coating for anti‐corrosion/scaling: insights from covalent interpenetrating networks and multiple interfacial interactions

Abstract Slippery liquid‐infused porous surfaces (SLIPS) with exceptional liquid repellency and extremely low sliding angles demonstrate significant potential for applications in anti‐corrosion, anti‐fouling, and anti‐scaling. However, the poor stability of the oil layer restricts its practical applications. Herein, a durable SLIPS coating with highly stable oil layer was developed by combining hierarchical porous structures with covalent interpenetrating networks and multiple interfacial interactions. The hierarchical porous structure was constructed via urea thermal decomposition with in situ hybridization of SiO 2 and embedded carbon nanotubes (CNTs). Furthermore, the oil layer was chemically immobilized on the coating surface using methylenediphenyl diisocyanate (MDI) as a molecular bridge, leveraging interfacial covalent bonding and π‐OH interactions, which significantly enhanced its anti‐corrosion properties, with an initial | Z | 0.01 Hz of 1.22 × 10 8 Ω cm 2 . Dynamic scaling experiments revealed a 96.47% improvement in scaling inhibition efficiency compared to conventional superhydrophobic coatings, showing its excellent anti‐scaling properties. Owing to the durability and liquidity of oi layer, the prepared FEVE‐SiO 2 /CNTs@MDI SLIPS coating maintained outstanding slippery performance (water sliding angle < 10°) even after 14 days of underwater immersion. Additionally, the coating also exhibited excellent thermal stability (120 °C), remarkable shear resistance (5000 rpm), and ultraviolet resistance performance. Therefore, the prepared FEVE‐SiO 2 /CNTs@MDI SLIPS coating has broad practical application prospects in the field of industrial oilfield pipeline protection.