Abstract
The incorporation of N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (AEAPMS) modified Nb2C into graphene oxide (GO) results in the GO-AEAPMS/Nb2C nanofillers which are dispersed in the epoxy resin (EP). Electrochemical techniques, such as scanning electrochemical microscopy (SECM) and Electrochemical impedance spectroscopy (EIS) were used to assess the protective effects of EP coating on AA8019 in the presence of various amount of GO/AEAPMS-Nb2C in seawater. It was established that 0.6 was the optimal weight percentage of GO-AEAPMS/Nb2C in the epoxy matrix, resulting in an excellent coating performance. The coating resistance of EP-GO/AEAPMS-Nb2C was over 70.6 times greater than plain coating. Even after spending 960 h exposed in seawater, the EP-GO/AEAPMS-Nb2C nanocomposite demonstrated improved coating resistance (10,366 kΩ·cm2) according to EIS tests. The least amount of Al3+ ions were discharged (1.1 I/nA), according to SECM measurements, at the scratch of the EP-GO/AEAPMS-Nb2C coating due to the coated substrate’s better resistance to anodic dissipation. The corrosion resistance of the substrates was increased by carbide coatings, however, due to the porosity of the EP-Nb2C coatings and the roughness of the coating-substrate interface, the corrosion resistance of these layers reduced after 960 h of exposure to the seawater. According to Field emission scanning electron microscopy with energy dispersive X-ray spectroscopy (FE-SEM/EDX) investigation, the Nb2C was discovered in the rusted components, generating an exceptional inert coating at the surface. The results showed that the newly formed EP-GO/AEAPMS-Nb2C composite has enhanced barrier capabilities and hydrophobic qualities with water contact angle (WCA) of 157°. When GO-AEAPMS/Nb2C was introduced, the epoxy matrix’s mechanical properties are improved (Adhesion strength: 27.3 MPa) and (Microhardness: 3990 MPa). The EP-GO/AEAPMS-Nb2C nanocomposite may therefore be utilized as a coating material in aerospace industries.
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