A research team led by Jing Gou has developed a novel strategy to improve the corrosion resistance of water-borne epoxy coatings. The synergistic effect of the passive barrier provided by g-C₃N₄ and the active protection function from the PPy shell significantly prolonged the protective period compared to conventional water-borne epoxy systems. Offshore oil rigs, ships, pipelines, and civil engineering projects demand maximum corrosion protection and durability, making maintenance costly and labor-intensive. Significantly reduced corrosion and improved adhesionAt the end of the testing period, the low-frequency impedance value (|Z| at 0.01 Hz) for the CPB/EP samples was three orders of magnitude higher than that of pure epoxy. These results underline the potential of mesoporous g-C₃N₄@PPy nanocontainers for developing durable, high-performance water-borne corrosion protection systems.