Preparation of BTA@HMCs/PANI Microcapsules and Corrosion Resistance of Epoxy Coatings
Hollow mesoporous carbon spheres(HMCs)synthesized by hard template method was used as microcontainers.BTA@HMCs/PANI microcapsules loaded with corrosion inhibitor benzotriazole(BTA)were successfully prepared by vacuum impregnation and in-situ polymerization.The prepared microcapsules were spherical with an average particle size of about 270 nm,a wall thickness of(50±10)nm,and a core content of 31.0%.The self-healing epoxy coating with 5% BTA@HMCs/PANI microcapsules has the best corrosion resistance.The salt water immersion experiment shows that the epoxy composite coating has no obvious corrosion phenomenon after 30 d of immersion,and the EIS electrochemical impedance experiment shows that the impedance modulus of the epoxy composite coating in the low frequency region is 2～3 orders of magnitude higher than that of the pure epoxy coating.At the same time,the synergistic anti-corrosion mechanism of microcapsule core material corrosion inhibitor BTA and microcapsule wall material PANI was revealed.
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