Slippery Liquid-Infused\nPorous Surfaces Containing\nUiO-66 Incorporated with 8‑Hydroxyquinoline for Excellent Corrosion\nProtection of AZ31 Mg Alloys

The conventional slippery liquid-infused porous surfaces\n(SLIPSs)\nprovide relatively limited corrosion protection and self-healing performance\nfor AZ31 Mg alloys. To this end, 8-hydroxyquinoline (8-HQ) was incorporated\ninto a zirconium-based metal–organic framework UiO-66 through\ncoordination (8-HQ@UiO-66), which was then dispersed into silicone\noil to fabricate nanoparticle-enhanced-SLIPSs (8-HQ@UiO-66-SLIPSs).\nEspecially, the influences of 8-HQ@UiO-66 concentration on the surface\nmorphology, surface hydrophobicity, and corrosion resistance were\nstudied. It was found that the surface hydrophobicity first increased\nand then decreased with increasing concentration, showing the highest\nwater contact angle of 121.2° at a concentration of 1 mg mL<sup>–1</sup> (8-HQ@UiO-66-SLIPS-1). This was attributed to the\ndevelopment of well-constructed hierarchical micro/nanostructures.\nMoreover, it also exhibited the best anticorrosion property, with\nthe lowest corrosion current density of 1.24 × 10<sup>–10</sup> A cm<sup>–2</sup> and the highest impedance modulus of 9.88\n× 10<sup>8</sup> Ω cm<sup>2</sup> at 0.01 Hz, primarily\nassociated with the synergistic interaction of 8-HQ and UiO-66. Further,\nthe self-healing performance was evaluated using the scanning vibration\nelectrode technique (SVET), verifying the superior self-healing performance\nof 8-HQ@UiO-66-SLIPS-1. Hence, the nanoparticle-enhanced-SLIPSs exhibit\nconsiderable potential in the corrosion protection of Mg alloys, thereby\naccelerating their extensive applications in industry.