Design of an anticorrosion/bactericidal dual functional organic coating based on the slippery liquid-infused porous surface

In this work, a long-lasting slippery liquid-infused porous surface (SLIPS) was fabricated on an organic coating to achieve both anticorrosion and antibacterial functions. Phenyl-modified etched basalt (PEB) scales were produced to construct micro-nano capillary structures and generate π electrons, which facilitated the retention of lubricant on the surface when assembled onto an epoxy resin layer. Plant oil was selected as a lubricant to introduce numerous –COOH, and was robustly trapped on the surface by π-COOH interactions, which enhanced the durability of the SLIPS coating. Based on the electrochemical tests, the coating displayed superior anticorrosion performance with |Z|0.01Hz values of 1.99 × 1010 Ω·cm2 after 14 days of immersion, which benefited from excellent barrier effect and liquid repellency. The zeta potential result proved that the corrosion resistance of SLIPS coating was further improved by the electrostatic repulsion. In addition, the antibacterial experiment results demonstrated only 0.32% of biofilm coverage and no live bacteria after 3 days of immersion, which implied the dual mechanisms of SLIPS coating in killing bacteria and inhibiting bacterial adhesion. The SLIPS coating with excellent lubricant retention and promising anticorrosion/bactericidal performance possesses tremendous application potential in marine protection.