▎ 摘　　要

NOVELTY - Preparing lignin/graphene-based composite anticorrosive coating involves dissolving lignin to obtain lignin solution, adding Hydrogen bromide (HBr) solution, reacting under heating and stirring, cooling to room temperature, obtaining reaction solution, and adding reaction solution to the HCl solution, stirring, centrifuging to obtain precipitate, and then washing and drying precipitate to obtain hydroxylated lignin. The hydroxylated lignin is dissolved in water to obtain a lignin dispersion with a concentration of 0.5-2 g/L, graphite is added, ultrasonically, and centrifuged to obtain lignin/graphite solution of olefin particles, filtered to obtain lignin/graphene particles, washed, and then dissolved in lignin/graphene particles to obtain a saturated lignin/graphene dispersion. The amount of graphite added is lignin dispersion and graphite is 25: 1-100: 1. USE - Method for preparing lignin/graphene-based composite anticorrosive coating used for corrosion protection of a metal substrate or a building material surface (claimed). ADVANTAGE - The method enables to prepare lignin/graphene-based composite anticorrosive coating which has good thermal stability, used for anticorrosion of metal and building materials, showing good capacitive reactance arc and high pyrolysis temperature. DETAILED DESCRIPTION - The saturated lignin/graphene dispersion, aqueous curing agent, epoxy resin and solvent are added to obtain a coating preparation body, defoaming and coating on the surface of the base material, curing to obtain the lignin/graphene-based composite anticorrosive coating. The mass ratio of the saturated lignin/graphene dispersion to the epoxy resin in the coating preparation is 1:5-1:8. The mass ratio of the epoxy resin to the aqueous curing agent in the coating preparation is 5:2-5:2.25. The mass ratio of the epoxy resin to the solvent in the coating preparation is 5:1-5:2.