BackgroundMetal corrosion causes tremendous economic losses, including Mg and its alloys. The development of protective coatings is a good strategy to alleviate or inhibit corrosion.MethodsHerein, a slippery liquid-infused porous surface (SLIPS) was fabricated on the AZ31 Mg alloy substrate, based on ZnAl-layered double hydroxide (ZnAl-LDH). Especially, the electrolyte pH was adjusted to synthesize ZnAl-LDH with different morphology to accommodate the most silicone oil for SLIPSs.Significant findingsA smooth and homogeneous liquid layer was stably anchored in the ZnAl-LDH, forming a SLIPS. Although water contact angle was less than 150° for the SLIPS, the water droplet can easily slide on the surface, presenting low adhesion to the external species. The SLIPS showed the best corrosion protection, with the lowest corrosion current density of 5.01 × 10−9 A cm−2 and largest impedance modulus of 4.92 × 107 Ω cm2. Moreover, a long-term immersion test and stability examinations in harsh conditions were carried out to further evaluate the performances of superhydrophobic surface and SLIPS. The much more stable liquid layer than air pockets made the SLIPS perform better and provide reliable corrosion protection. Therefore, SLIPSs can further promote the wide applications of Mg alloys.