Abstract:

The relatively poor corrosion resistance remarkably limits the wide applications of Mg alloys in practice, although they possess many attractive properties, like low density, high specific strength, and good biocompatibility. The formation of a protective coating can effectively suppress the corrosion. In this work, a slippery liquid-infused porous surface (SLIPS), with good surface hydrophobicity, stability, and self-healing property, was formed on AZ31 Mg alloys. The development of SLIPS requires suitable porous micro/nanostructures. Layered double hydroxide (LDH), with effective corrosion resistance for Mg alloys, was a good candidate to accommodate the liquid lubricant. Especially, different temperatures were applied to in situ form MgAl-LDH on AZ31 Mg alloys. The results showed that the temperature of 120 °C was the best condition for the SLIPS to provide good corrosion protection for Mg alloys, with the lowest corrosion current density of 3.19 × 10^-9 A cm⁻². In addition, the SLIPS performed well in the long-term immersion test and abrasion test. The AZ31 Mg alloys with superior corrosion resistance and good mechanical and chemical stability can be extensively applied in areas of automotive, electronics, and aerospace.

Key words: Mg alloy, Hydrothermal temperature, Corrosion protection, Slippery liquid-infused porous surface, Hydrophobicity, Surface stability