A Fabrication Strategy for Durable Slippery Organic Coating toward Antifouling and Anticorrosion via Digital Light Processing

The slippery liquid-infused porous surfaces (SLIPS) have recently attracted significant interest in marine antifouling and corrosion protection. Nevertheless, the insufficient durability and corrosion resistance of SLIPS considerably affect their application potential. In this work, a preparation strategy for ultradurable slippery organic coating was proposed to combat biofouling and corrosion. Digital light processing (DLP) was first employed to fabricate organic protective coatings with gradient porous structures to improve the stability and durability of the SLIPS. The structure with a smaller pore size in the upper segment relative to the basal area was designed to concurrently enhance the lubricant's storage and retention capabilities. The antifouling experiment demonstrated excellent antifouling performance, with a bacterial colonization of merely 2.08% after immersion in a Pseudomonas aeruginosa solution for 28 days. The antialgae assessment demonstrated that the surface antifouling efficacy of the gradient SLIPS coating was enhanced by 99.75% after a 10-day immersion period. The EIS results indicated that the SLIPS coating with a gradient porous structure exhibited remarkable corrosion resistance, as evidenced by a |Z|_{0.01 Hz} value of 2.93 × 10¹⁰ Ω·cm² after 60 days of immersion. The gradient porous structure effectively resolves the intrinsic dilemma between the storage and depletion of lubricant, which greatly improves the stability and durability of the SLIPS coating. The ultradurable slippery organic coating with facile preparation and controllable structure exhibits exceptional long-term antifouling and anticorrosion properties, thereby making it highly promising for potential application.