A hydrophobic smart coating based on hexagonal boron nitride/metal-organic frameworks for high-performance corrosion protection

In this study, NH2-MIL-125(Ti) was compounded with hexagonal boron nitride (HBN) to prepare nano-composite which had an active and passive corrosion resistance. NH2-MIL-125(Ti) MOFs was synthesized by common methods and it was applied as nanocontainer to encapsulate 2-mercaptobenzothiazole (MBT). Then the composite was modified with 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane (PFTS) to make the coating hydrophobic. The UV–vis showed MIL had a good pH responsivity and the loading capacity of MBT reached 17.6 %. The water contact angle of the coating increased from 72.68° to 122.14°. Because of the tetrabutyl titanate in MIL, the crosslinking density of epoxy resin was improved, and the adhesion of coating increased by 81.7 %. In addition, EIS results showed the high corrosion resistance of the composite coating [email protected]/EP in 5 wt% NaCl solution. In conclusion, 0.5 wt% [email protected] can increase the impedance of the coating by 3 orders of magnitude.