▎ 摘　　要

NOVELTY - The preparation method of composite protective solution involves (i) placing aniline solution in an ice-containing water bath to obtain polyaniline aqueous solution, (ii) preparing graphene oxide dispersion using expandable natural graphite, (iii) mixing polyaniline aqueous solution and graphene oxide dispersion according to the required ratio, and reacting at room temperature. USE - Preparation of composite protective solution (claimed). ADVANTAGE - The environmentally-friendly method enables the preparation of non-toxic composite protective solution with excellent anticorrosive effect, and exhibits preservative effect even in high temperature environment.