Silane coupling agent modified layered double hydroxide/graphene oxide preparation of intelligent anticorrosive coating

Common coatings have unsatisfactory long-term anticorrosion performance due to poor barrier property. In this work, LDH-MoO42− nano-filler (KGO@LM) modified by KH-570 and GO was prepared to improve the long-term corrosion resistance of epoxy resin (EP) coating. The filler integrates the three functions of barrier, chloride ion trapping and self-repair, and has good dispersion and compatibility in EP. After soaking in 3.5 wt% NaCl solution for 28 days, the low-frequency impedance of KGO@LM coating was still as high as 1.02 × 108 Ω·cm2, while the remaining value of EP coating was only 2.63 × 106 Ω cm2,so the addition of KGO@LM filler significantly improved the anticorrosive effect of EP coating. After soaking in 3.5 wt% NaCl solution for 18 h, the low-frequency impedance of the scratched KGO@LM/EP coating was 1.5 orders of magnitude higher than that of the EP coating, which proved that the designed filler had a significant corrosion inhibiting effect. Therefore, it is believed that this work can provide some inspirations for other researchers to develop long-term anticorrosion coatings.