Fabrication of CNTs/MMT/PPS composite hydrophobic coatings on metal with enhanced anticorrosive and self-cleaning performance

Although much work has been reported on anticorrosive coatings at this stage, most materials are confronted with a variety of harsh environments in practical applications, posing extreme challenges to the various properties of the coatings. In this study, carbon nanotube/montmorillonite/polyphenylene sulfide (CNTs/MMT/PPS) composite coatings were prepared by air spraying method. CNTs-MMT composite fillers with nanostructures were prepared by the amide reaction of 3-aminopropyltriethoxysilane (APTES) modified MMT and carboxylated CNTs. The particle size distribution test demonstrated that the amidated CNTs-MMT exhibited superior dispersion performance compared to CNTs and MMT alone, resulted in a more homogeneous and dense coating. The coatings obtained by combining the low surface energy of polytetrafluoroethylene (PTFE) exhibits hydrophobicity and has excellent self-cleaning properties. The electrochemical corrosion current density of the composite coating was three orders of magnitude lower than that of bare iron, and the corrosion efficiency was 99.43 %, demonstrating excellent corrosion resistance . The thermogravimetric test results showed that the CNTs/MMT/PPS composite coatings displayed excellent thermal stability up to 530 °C. Therefore, the CNTs/MMT/PPS composite coating possesses significant advantages in the field of anti-corrosion due to its enhanced durability, heat resistance, and corrosion resistance .