Facile modification of graphene oxide with Lysine for improving anti corrosion performances of water borne epoxy coatings
Abstract To develop the compatibility of graphene oxide (GO) nanosheets with water borne epoxy (EP) coatings, a natural amino acid with double amines (Lysine) was used to modify GO (LY GO) Results obtained from Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, X ray photoelectron spectroscopy (XPS) X ray diffraction (XRD) confirm that Lysine is successfully decorated on GO surface by formation of chemical bonds. Then LY GO nanomaterials were introduced into EP coatings on the mild steel substrate. The SEM images demonstrate that distribution of LY GO in EP coatings was remarkably improved due to Lysine modification. The effect of LY GO and GO nanosheets on the anti corrosion property of the EP coating was studied by potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) and salt spray test. Results reveal that well distributed LY GO nanosheets remarkably reinforce the anti corrosion performance of the EP coatings. At the same filler content, LY GO provides EP coating with better anti corrosion property of than GO and the corrosion rate of LY GO/EP coating is approximately two orders of magnitude lower than that of GO/EP. Moreover, LY GO can also effectively decrease the coating delamination degree during salt spray test of 500 h.
Progress in Organic Coatings