Study on Anti-corrosion Performance of Aryl Phosphate Salt Modified Graphene/Waterborne Epoxy Composite Coating
HUANG Zhixiong1, HU Xinjun1,2,*, TIAN Jianping1, CHEN Manjiao1, MA Xiaoyan2, JIANG Xuelian1, TANG Shiying1
1 School of Mechanical Engineering, Sichuan University of Science & Engineering, Zigong 643000, Sichuan, China 2 Material Corrosion and Protection Key Laboratory of Sichuan Province, Sichuan University of Science & Engineering, Zigong 643000, Sichuan, China
Abstract: In this work, in order to improve the dispersion and compatibility of graphene in aqueous epoxy resin (EP), graphene is modified by 2, 2′-methylene bis (4, 6-di-tert-butylphenol) sodium phosphate (NA-11). The modified graphene was dispersed in epoxy resin, and the curing agent was added to prepare graphene/epoxy coating. The scanning electron microscopy (SEM), X-ray diffraction (XRD), infrared spectroscopy (FTIR), AC impedance spectroscopy (EIS) and potentiodynamic polarization curve (Tafel) were used to analyze the structure and corrosion resistance of the composite coating. The obtained results show that NA-11 modified graphene has a high dispersibility in water and epoxy resin. The modified graphene can significantly improve the corrosion resistance of the composite coating, the initial impedance modulus (Z0.01 Hz) increased from 445.7 kΩ·cm2 to 5 047 kΩ·cm2, and the self-corrosion current density (icorr) decreased from 0.202 3 μA·cm-2 to 0.006 441 μA·cm-2. Finally, the physical barrier property and ‘labyrinth effect' of graphene significantly improve the long-term protective effect of the coating on the substrate.
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2023, Vol. 37 
