Research on the Structural Control and Corrosion Resistance of Self-corrosion-inhibiting Epoxy in Marine Environments
In the curing process of epoxy coating,micro-cracks,pinholes,and gaps inevitably appear within the coating,providing pathways for corrosive media to penetrate the coating and corrode the underlying metal substrate.To prevent the penetration of corrosive media,the molecular structure of epoxy resin was designed,and a series of self-corrosion-inhibiting epoxy resins containing azafluorene structures were prepared by adjusting the content of monomers bisphenol A,9,9-bis(4-hydroxyphenyl)fluorene,and epichlorohydrin.The consistency of the prepared resin structure with the designed structure was confirmed by infrared spectroscopy(FI-IR),nuclear magnetic resonance(NMR),and elemental analysis.Subsequently,the anticorrosion performance in a marine environment was studied through adhesion tests,salt spray tests,and electrochemical impedance spectroscopy(EIS)analysis.The results showed that the nitrogen non coordinating electrons of azafluorene structure and the π electrons of the benzene ring could adsorb on the metal surface,and simultaneously form corrosion-inhibiting coordination with iron ions at the initial stage of corrosion,effectively enhancing the adhesion between epoxy resin and the substrate.After immersion in a 3.5％NaCl solution for 60 days,the impedance value reached 106 Ω·cm2,and the corrosion products in the scratch salt spray test were significantly reduced,indicating excellent comprehensive anticorrosive properties.
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