Engineering organic-inorganic frameworks as functionalized coating with remarkable active sites for boosted durability of anti-corrosion protection

Abstract

In the realm of material engineering, the emergence of layered double hydroxides (LDH) with their exceptional hierarchical arrangements has sparked immense interest, positioning them as promising contenders for avant-garde implementations. However, designing well-defined LDH-based anticorrosion systems with excellent activity and robust stability at the industrial grade remains a serious challenge in practical applications. In this vein, an interface engineering controlled by layer-by-layer protection strategy was applied to construct three-dimensional (3D) hybrid material grown on Mg alloy as a highly efficient functional anti-corrosive coating. The present work unveils a new chitosan (CS) Schiff-base nature-inspired network, crafted to transcend the capabilities of porous MgO coating through the application of pulsed plasma electrolysis (PPE). Moreover, an ingenious strategy is proposed, involving the direct synthesis of LDH, serving as an exemplary foundation to augment the electrochemical proficiency, thereby transforming it into a purposeful film that excels in electron transport. Guided by this fabrication strategy, it is found that the resulting architecture not only exposes enriched active sites with an outstanding performance but also exhibits exceptional stability. This work provides fresh insight into the design of advanced hybrid materials suggesting a promising avenue that is expected to support next-generation anti-corrosion engineering development.