Abstract: In order to meet the integrated requirements of anti-corrosion and fire prevention for steel structures, by leveraging the passivation anti-corrosion function of polyaniline and the barrier shielding effect of basalt scales, polyaniline (PANI) modified basalt flakes (BS) composite material (PANI-BS) was prepared by in-situ polymerization method. The morphology, composition and structure of the composite material were analyzed， and the synergistic anti-corrosion and fire resistance properties of the composite material in waterborne epoxy system were investigated. Results showed that PANI coated modified BS can be obtained through oxalic acid doping and in-situ polymerization. PANI-BS has good anti-corrosion function in pure epoxy system, and the epoxy fireproof coating prepared by combining with ternary flame retardant expansion agent also exhibits good fire resistance performance. The comprehensive performance of the coating is related to the amount of PANI-BS added, and the coating containing 3% composite material has the best anti-corrosion and fireproof ability. The experiment shows that PANI-BS has good potential for application in the integration of anti-corrosion and fire prevention requirements.

Key words: intumescent coatings, polyaniline, basalt scales, anti-corrosion and fire-resistant