Mixed metal Nitride-GO nanohybrids reinforced epoxy coatings for improved corrosion protection and mechanical properties in industrial applications

Key words:  graphene oxide  nanocomposites  coating and corrosion  mechanical properties  functional materials

Abstract:

Epoxy (EP) coatings were modified with VN, MoN, 2-aminobenzothiazole (ABT), and graphene oxide (GO) to enhance anti-corrosion and mechanical performance. Structural and morphological analysis (SEM/EDX, TEM, TGA, XRD, XPS) confirmed the uniform dispersion of VN/MoN nanoparticles, which significantly improved the barrier properties of the coatings. Electrochemical analysis (scanning electrochemical microscopy (SECM), electrochemical impedance spectroscopy (EIS)) demonstrated superior corrosion resistance for the EP/GO/ABT-VN/MoN coating, with a charge transfer resistance of 1.53×1013 ?·cm2 and coating resistance of 1.05×1013 ?·cm2 in 3.5% NaCl solution. SECM measurements showed a 93.5% reduction in electrochemical activity (1.6 nA vs. 24.8 nA for pure epoxy) after 45 d of immersion. The nanocomposite exhibited exceptional adhesion strength (20.3 MPa) and hardness (1382 MPa), with improved hydrophobicity (159° contact angle), effectively preventing corrosive ion penetration. The scientific significance of this study lies in the development of a multifunctional nanocomposite coating that integrates high corrosion resistance, mechanical durability, and hydrophobicity, addressing long-standing challenges in protective coatings for metal structures. The incorporation of GO/ABT-VN/MoN nanoparticles establishes a passive protective layer that not only prevents aggressive ion diffusion but also enhances mechanical strength and interfacial adhesion, ensuring long-term stability. These findings provide a new design strategy for next-generation epoxy-based coatings with superior durability in harsh environments, making them highly relevant for applications in marine, aerospace, and industrial infrastructure.