▎ 摘　　要

NOVELTY - A composite coating comprises 100-200 pts. wt. zirconium dioxide, 3-13 pts. wt. modified graphene and 5-10 pts. wt. all-alkyl acrylate copolymer emulsion. USE - Composite coating for coating surface of steel material. ADVANTAGE - The composite coating has improved hardness and corrosion resistance, inhibits invasion of water, oil, and other corrosive substances into the steel material so as to obtain a dust-free and compact steel material, and prolongs the service life of steel material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the composite coating.