Multifunctional nanocomposite coatings for superior anticorrosive, flame retardant and mechanical properties in aerospace components

Abstract

The addition of manganese disulphide (MnS2), 3-(m-aminophenoxy)propyltrimethoxysilane (APMS), and graphene oxide (GO) has improved the anticorrosion, flame retardant, and mechanical properties of polyurethane (PU) coatings. By using Scanning electron microscopy (SEM)/Energy dispersive X-ray analysis (EDX), Transmission electron microscopy (TEM), Thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy, and X-ray diffractometry (XRD) techniques, the structural and morphological behaviors of the films such as APMS/MnS2, GO/MnS2, and GO/APMS-MnS2 were studied. The inclusion of these films in the PU matrix resulted in various coating formulations, such as pure PU, PU-MnS2, PU-APMS/MnS2, PU-GO/MnS2, and PU-GO/APMS-MnS2. The result was an 82-fold increase in the dielectric constant of PU at 1 Hz with the addition of just 0.3% GO/APMS-MnS2. Additionally, compared to plain PU, the PU-GO/APMS-MnS2 shown greater flame retardancy with substantial drops in the values of PHRR and THR, or 59% and 54% reductions, respectively. The anticorrosive, hydrophobic, flame retardancy, and mechanical performance of the PU coating are improved on the GO/APMS-MnS2 composite. As evidenced by its water contact angle (WCA) of 166˚, the superhydrophobic behavior is validated. In addition, the coating resistance of PU-GO/APMS-MnS2 was found to be significantly greater (17999.5 kΩ.cm2) than those of the investigated coatings. Similarly, the adhesive strength (15.8 MPa), microhardness (1300 MPa), and tensile strength (198 MPa) of the PU-GO/APMS-MnS2 were observed to be much higher than the other formulations. In light of this, the PU-GO/APMS-MnS2 nanocomposite may be used as a coating material in industrial applications.