▎ 摘　　要

NOVELTY - Anti-corrosion coating for metal surface comprises (i) adjusting pH value of few-layer graphene aqueous solution, adding silane coupling agent, stirring, making graphene and silane coupling agent bond-bond connection, where the silane coupling agent is amino or epoxy silane coupling agent, adding silane coupling agent to few-layer graphene aqueous solution, adding first dispersant, and stirring to obtain few-layer graphene dispersion, (ii) preparing anticorrosion primer by adding graphene nanosheets and second dispersant into solvent, stirring to obtain graphene nanosheet dispersion, adding graphene nanosheets per liter of solvent, adding second dispersant to every g graphene nanosheets, adding graphene nanosheet dispersion liquid in primer, mixing to obtain anticorrosion primer, and adding graphene nanosheet dispersion per kg primer, (iii) surface cleaning of workpiece metal to be coated, and (iv) coating few-layer graphene dispersion on metal surface of workpiece to be coated. USE - The method is useful for anti-corrosion coating for metal surface. ADVANTAGE - The coating: increases the adhesion of the primer to the pretreatment layer and metal surface; improves the anti-corrosion effect of the coating; and has characteristics of excellent water resistance and high hardness. DETAILED DESCRIPTION - Anti-corrosion coating for metal surface comprises (i) preparing few-layer graphene dispersion by adjusting pH value of few-layer graphene aqueous solution with content of 0.5-2 g/l to corresponding pH value of corrosion inert zone of workpiece metal material potential-pH figure to be coated, adding silane coupling agent, stirring at room temperature for 4-6 hours, making graphene and silane coupling agent bond-bond connection, where the silane coupling agent is amino or epoxy silane coupling agent, adding 20-100 ml silane coupling agent to each liter of few-layer graphene aqueous solution, then adding first dispersant, stirring to obtain few-layer graphene dispersion, where the first dispersant is a polymer surfactant, and adding 1-20 milliliters of first dispersant per liter of few-layer graphene aqueous solution, (ii) preparing anticorrosion primer by adding graphene nanosheets and second dispersant into solvent, uniformly stirring with high-shear device at room temperature to obtain a graphene nanosheet dispersion, adding 2-20 g graphene nanosheets per liter of solvent, where the second dispersant is macromolecule surfactant, adding 0.02-0.5 g second dispersant to every gram of graphene nanosheets, adding graphene nanosheet dispersion liquid in primer, uniformly mixing to obtain anticorrosion primer, adding 1-100 g graphene nanosheet dispersion per kg primer, (iii) surface cleaning of workpiece metal to be coated, (iv) coating few-layer graphene dispersion on metal surface of workpiece to be coated, and drying at 100-200°C for 0.5-5 minutes to form a pretreatment layer, (v) applying anti-corrosion primer to pretreatment layer by rolling, dip coating, electrophoresis or spraying, and (vi) drying at 150-200°C for 5-10 minutes to obtain the finished product.