Severe marine biofouling and corrosion seriously degrade the service performance of ship equipment, which urgently requires the development of environmentally friendly, long-lasting and high-performance integrated antifouling and anti-corrosion approaches. Nepenthes-inspired slippery liquid-infused porous surfaces (SLIPS) represent a promising and effective strategy for antifouling and anti-corrosion. The stability of the lubricating oil film on SLIPS constitutes a technical bottleneck restricting its long-term antifouling and anti-corrosion capability. Nevertheless, existing SLIPS with single-modal microscale or nanoscale pores cannot simultaneously achieve superior oil storage and oil locking capacities to stabilize the lubricant, making long-term antifouling and anti-corrosion difficult to realize. In this study, a design strategy is proposed to fabricate SLIPS with three-dimensional networked micro/nano bimodal porous structures via plasma spraying. A novel oil stabilization mechanism synergized by bimodal pores is developed to realize the integrated long-life SLIPS design: microscale pores act as reservoirs for oil supply, nanoscale pores provide strong oil locking to reduce lubricant loss, and the 3D pore network enables continuous lubricant replenishment. On this basis, a bilayered SLIPS coating with nanopores in the top layer and micropores in the bottom layer is further developed, which achieves further improved long-term antifouling and anti-corrosion performance.

Antifouling; anti-corrosion; long-term; bio-inspired