▎ 摘　　要

NOVELTY - Coating system comprises at least one layer A, and at least one layer B, where the layer A is made of a material chosen from pyrolytic graphite, pyrolytic boron nitride, compressed expanded graphite, hot-pressed turbostratic boron nitride, compressed graphene flakes, compressed hexagonal boron nitride flakes, and/or graphitized graphene oxide flakes. The layer B is made of a composite comprising a polymeric matrix and 2-dimensional (2D) flakes. The 2D flakes are made of a material chosen from graphene, graphene oxides, reduced graphene oxide, heteroatom-doped graphene, hexagonal boron nitride, metal chalcogenides, metal oxides, metal chalcogenide halides, metal halides, MXenes, metal carbides, metal nitrides, layered hydroxides, alkaline-earth metal silicides, alkaline-earth metal bromides, alkaline-earth metal germanides and alkaline-earth metal stannides, layered perovskites, phosphorene, silicene, antimonene, germanene, boronene, stanene, and/or bismuthene. USE - The coating system is used for protecting a substrate, preferably metallic or plastic substrate. ADVANTAGE - The coating system protects metallic or plastic substrate, has superior and long-lasting anticorrosion, barrier, antierosion and antioxidant properties, and excellent mechanical properties, and allows a reduction of polymer outgassing effects. DETAILED DESCRIPTION - Coating system comprises at least one layer A, and at least one layer B, where the layer A is made of a material chosen from pyrolytic graphite, pyrolytic boron nitride, compressed expanded graphite, hot-pressed turbostratic boron nitride, compressed graphene flakes, compressed hexagonal boron nitride flakes, and/or graphitized graphene oxide flakes. The layer B is made of a composite comprising a polymeric matrix and 2-dimensional (2D) flakes. The 2D flakes are made of a material selected from graphene, graphene oxides, reduced graphene oxide, heteroatom-doped graphene, hexagonal boron nitride, metal chalcogenides, metal oxides, metal chalcogenide halides, metal halides, phosphotrichalcogenides, MXenes, metal carbides, metal nitrides, layered hydroxides, alkaline-earth metal silicides, alkaline-earth metal bromides, alkaline-earth metal germanides and alkaline-earth metal stannides, layered perovskites, phosphorene, silicene, antimonene, germanene, boronene, stanene, and/or bismuthene. An INDEPENDENT CLAIM is included for a coated substrate comprising a substrate and the coating system, where the layer B faces the substrate.