▎ 摘　　要

NOVELTY - An anti-corrosion composite layer comprises anti-corrosion coating (20) on a substrate (10), and comprising graphene nanosheets (22) and a carrier resin (R1), and a anti-corrosion coating (30) on anti-corrosion coating (20), and comprising a graphene nanosheets (32) and a carrier resin (R2). Each surface of graphene nanosheet (22) has a lipophilic functional group (L1) for chemically bonding to the carrier resin (R1), and each surface of graphene nanosheet (32) has lipophilic functional group (L2) for chemically bonding to the carrier resin (R2). USE - Anti-corrosion composite layer is used for protecting metal building materials. ADVANTAGE - The layer has excellent anti-corrosion ability, high weather durability, mechanical strength, heat dissipation performance, and suppresses deterioration of materials when exposed to outdoor. DETAILED DESCRIPTION - An anti-corrosion composite layer used for protecting metal building materials, comprises anti-corrosion coating (20) on a substrate (10), and comprising graphene nanosheets (22) and a carrier resin (R1), and a anti-corrosion coating (30) on anti-corrosion coating (20), and comprising a graphene nanosheets (32) and a carrier resin (R2). Each surface of graphene nanosheet (22) has a lipophilic functional group (L1) for chemically bonding to the carrier resin (R1), and each surface of graphene nanosheet (32) has lipophilic functional group (L2) for chemically bonding to the carrier resin (R2). The lipophilic functional group (L1) is selected from carboxyl, epoxy and amino, and the lipophilic functional group (L2) is hydroxyl and/or isocyanic acid group. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic cross-sectional view of anti-corrosion composite layer. Substrate (10) Anti-corrosion coatings (20,30) Carrier resin (21,31) Graphene nanosheets (22,32) Filler (23,33)