▎ 摘　　要

NOVELTY - Cationic dopamine-functionalized graphene aqueous anticorrosive coating comprises a cationic dopamine-functionalized graphene material and an aqueous resin emulsion, where the cationic dopamine-functionalized graphene material is uniformly dispersed in the aqueous resin emulsion. USE - The cationic dopamine-functionalized graphene aqueous anticorrosive coating is used for preparing anticorrosive coating in corrosion application (all claimed). ADVANTAGE - The dopamine-modified graphene of the cationic dopamine-functionalized graphene aqueous anticorrosive coating improves its dispersibility and stability, and prolongs diffusion path of corrosive medium. The electrophoretic deposition technique is simple to operate, economical and environmentally-friendly. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the cationic dopamine-functionalized graphene aqueous anticorrosive coating, which involves modifying graphene oxide with dopamine to obtain a dopamine-functionalized graphene material, performing ionization treatment on the dopamine-functionalized graphene material to obtain a cationic dopamine-functionalized graphene material, and uniformly dispersing the cationic dopamine-functionalized graphene material in an aqueous resin emulsion to obtain the cationic dopamine-functionalized graphene aqueous anticorrosive coating; and (2) a method for preparing an anticorrosive coating, which involves using at least a substrate as a cathode, an anode, and an electrolyte to construct an electrochemical reaction system, where the electrolyte adopts the cationic dopamine functionalized graphene water-based anticorrosive coating, adopting electrophoresis deposition technology to energize the electrochemical reaction system, depositing a dense passivation layer on the surface of the substrate, and curing to obtain the anticorrosive coating.