摘要
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 1.53×10^(13)Ω·cm^(2) and coating resistance of 1.05×10^(13)Ω·cm^(2) 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(contact angle of 159°),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.
