Construction of ZIF-8@C3N4 hybrid epoxy slippery surface with tailored hierarchical architecture for enhancing antifouling, anticorrosion performance

Magnesium alloys possess significant application potential in various industrial sectors owing to their low density and high specific strength. Nevertheless, their poor corrosion resistance under harsh service conditions remains a critical challenge. In this study, a slippery liquid-infused porous surface (SLIPS), with hydrophobicity, anti-corrosion, and anti-fouling properties, was developed on Magnesium alloy substrates. A robust zeolitic imidazolate framework-8/graphitic carbon nitride (ZIF-8/g-C 3 N 4 ) coating with highly hydrophobic was first constructed on the Mg alloy surface, followed by silicone oil infusion. Within the hierarchical architecture, ZIF-8 nanoparticles are uniformly distributed on g-C 3 N 4 nanosheets, where ZIF-8 serves as anchoring sites to immobilize silicone oil, while g-C 3 N 4 nanosheets act as an effective physical barrier, mitigating both the penetration of corrosive media and the leakage of silicone oil. Benefiting from this synergistic structure, the prepared SLIPS exhibited significantly enhanced anticorrosion performances, with a minimum corrosion current density of 3.49 × 10 - ⁸ A·cm - ² and a maximum corrosion potential of -1.375   V. Furthermore, the ZIF-8/g-C 3 N 4 SLIPS maintained a high impedance modulus of 1.28 × 10⁵ Ω·cm² after 120   h of immersion in NaCl solution, highlighting its long-term stability. This study offers a controllable structural strategy for the development of ultradurable slippery surfaces with long-term corrosion resistance.