Corrosion-protective coatings: an overview of self-healing and hybrid coating-advancements

The review of earlier research on hybrid and self-healing coatings to increase metal corrosion resistance is the focus of this work. Previous studies from 2015 to 2023 were reviewed. Self-healing coatings, which may halt their own degeneration, have been shown to extend the life of metal protective coatings. Earlier reports reveal that these coatings functioned through several processes, involving physical ones such as chemical interactions or polymer diffusion that produced therapeutic compounds. While extrinsic self-healing coatings were reported to rely on encapsulated healing agents, intrinsic self-healing coatings were reported to use reversible chemical bonds inside the polymer matrix. The hybrid coatings, which are made up of multiple coating techniques in a complementary manner, have shown improved resistance to metal corrosion. The use of advanced hybrid coating and self-healing technologies offered a practical means of reducing metal corrosion and extending the life of metallic structures.