Designing Anti-corrosion Self-healable Epoxy Coating Reinforced with Guanine-MRS@MoS2 Nanohybrid for Sustainable Protection of Zn-Mg-Al Coated Steel

Zn-Al-Mg-coated steel (ZM-steel) confronts significant considerable challenges from over-film degradation and under-film metallic dissolution, compromising its durability under extreme weathering conditions. This research presented an intelligent coating system incorporating guanine-loaded melamine resin spheres (Gua-MRS) hybridized with MoS 2 nanosheets, engineered to deliver functional corrosion protection for ZM-steel. Gua-MRS@MoS 2 nanohybrid offered a dual-functional approach: MRS@MoS 2 provided robust electrochemical shielding and barrier properties within epoxy matrix, while corrosion-triggered release of guanine - at low pH and/or in NaCl environment imparted exceptional self-healing capabilities. This process formed a uniform precipitation film over ZM-steel surface, effectively combating aggressive corrosive species. The integration of this hierarchical heterostructure not only enhanced structural integrity but also improved the coating's corrosion resistance and thermal stability. These advancements position the coating as an innovative and sustainable solution for engineering applications in the automotive and marine industries. The intercomponent synergy of Gua-MRS@MoS 2 system opens new pathways for the development of high-performance, eco-friendly coatings.