▎ 摘　　要

NOVELTY - Method for preparing graphene-based composite coating involves heating expandable graphite by microwave to obtain expanded graphite, mixing the expanded graphite with absolute ethanol, peeling and performing centrifugal treatment for 0.5-2 hours to obtain a graphene suspension, carrying out dispersion treatment on the suspension to obtain a dispersion solution of graphene sheet, mixing the dispersion solution, manganese oxide nanoparticles and coupling agent, stirring, filtering and drying to obtain graphene-coated manganese oxide nanoparticles composite coating. USE - The method is useful for preparing graphene-based composite coating. ADVANTAGE - The method provides product with prolonged service life and excellent corrosion resistance and bio-adhesion resistance.