Lightweight alloys have gained prominence in weight-critical applications, however their susceptibility to corrosion and inability to mitigate surface ice accumulation remain significant limitations. In this study, these challenges are addressed by developing a photothermal self-healing, solid-like super-slippery coating using magnesium-lithium (Mg-Li) alloy as a substrate. Through synchrotron tomography, the mechanically cross-linked architecture of the cured super-slippery coating integrated with a micro-arc oxidation (MAO) layer is revealed. Experimental results demonstrate that the coating achieves autonomous repair under natural sunlight. In-situ metallographic microscopy further captures dynamic paraffin redistribution during the self-healing process. The contact angle of the FSSC-MAO coating reaches 100°, which effectively reduces the actual contact area between surface droplets and the coating and extending surface icing time by fivefold, while the active photothermal functionality enables rapid de-icing (outdoor temperature: −8℃) via sunlight exposure. Outdoor field tests validate the coating’s dual capability in corrosion resistance and ice mitigation, highlighting its potential for real-world applications in low-temperature environment.

Magnesium–lithium (Mg–Li) alloys are characteristic of great potentials for transformative weight reduction across diverse applications, from aeronautics and spacecraft to automobiles, electronics, and biomaterials. However, commercial services on Mg–Li alloys remain challenges given their poor corrosion resistance. This article critically reviews state-of-the-art progress of corrosion-resistant coatings for Mg–Li alloys, aiming to unlocking the full potential of such promising materials. The preparation techniques employed are summarized, the underlying protective mechanisms are elucidated, and coating performances are critically evaluated. This review further highlights key challenges for future exploration and development, and provides insightful perspectives towards emerging frontiers in this dynamic domain.