Recent progress in protective coatings against corrosion upon magnesium–lithium alloys: A critical review

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.