原位聚合法制备聚苯胺改性MoS₂及其环氧复合涂层的防腐性能

In order to improve the anti-corrosion performance of epoxy coatings, MoS₂ nanosheets were introduced as barrier, and polyaniline (PANI) was in-situ polymerized on the surface of MoS₂ nanosheets to prepare sandwich i-PANI@MoS₂ nanosheets. PANI could improve the conductive properties of coatings, so as to achieve anode passivation. Results show that when the molar ratio of PANI to MoS₂ was up to 7:1, the surface of MoS₂ nanosheets was evenly covered by PANI with the best modification effect. After compounding with epoxy resin, i-PANI@MoS₂-7 nanosheets were evenly dispersed in the epoxy resin. The conductivity of the composite coating was increased. It was due to the synergistic anti-corrosion effect of PANI and MoS₂, namely i-PANI@MoS₂ nanosheets could not only be used as physical barriers, but also as electrochemical corrosion protectors in coatings. Thus, the composite coating had the maximum impedance value, the maximum corrosion voltage, and the minimum corrosion current density with excellent anti-corrosion performance. However, with the further increase in the ratio of PANI to MoS₂, the PANI on the surface of MoS₂ nanosheets agglomerated, resulting in the decline in the anti-corrosion performance of the composite coating.