| In the field of metal corrosion and protection,coating is the simplest and most efficient method.However,metal materials will face different corrosive environments such as sea water,salt-alkali,and acid rain,which also puts forward higher requirements for anti-corrosion coatings.In this paper,the cerium oxide-graphene oxide nanocomposite was prepared by hydrothermal synthesis,and the prepared composite material was mixed with epoxy resin(EP)to prepare the coating.The structure of the composite material was studied by SEM-EDS and TEM.The corrosion of the metal substrate was studied through body microscope,and the mass ratio of Ce O2 and GO was optimized and studied through the open circuit potential(OCP),electrochemical impedance spectroscopy((EIS),potentiodynamic polarization curve and Mott-Schottky curve.The anti-corrosion performance of Ce O2-GO/EP coatings under simulated salt-alkali and simulated acid rain environments was studied.The main research contents and results are as follows:(1)The Ce O2-GO nanocomposites were prepared by hydrothermal synthesis.SEM-EDS and TEM results showed that the Ce O2 particles were successfully grown between the GO lamellae,which improved the problem of easy stacking of the lamellae of GO.Ce O2-GO modification ratio of 2:1 and 4:1 were more reasonable when Ce O2 grows uniformly.By studying the electrochemical properties of Ce O2-GO/EP with different mass ratios,the results showed that the Ce O2-GO/EP(4:1)coating had the largest capacitive arc resistance radius,the smallest carrier density and a coating protection efficiency of 99.88%.Therefore,the coating prepared at a Ce O2 to GO mass ratio of 4:1 has the best corrosion protection performance.(2)The anti-corrosion performance of the coating was investigated under simulated saline environment and temperature gradient changes.The electrochemical results showed that Ce O2-GO/EP coating had the largest capacitive arc resistance radius,the smallest carrier density and a high coating protection efficiency of95.76%.The corrosion results of the metal substrate showed that the corrosion depth of Ce O2-GO/EP coating is only 52.328?m and the total corrosion area is the smallest.This indicates that the Ce O2-GO/EP coating can resist salt and alkali corrosion better and has good corrosion protection performance.(3)The anti-corrosion performance of the coating was investigated in a simulated acid rain environment.The electrochemical results showed that the Ce O2-GO/EP coating had the largest capacitive arc resistance radius,the smallest carrier density and the Nyquist diagram did not show high frequency phase shift until late in the immersion period,with a coating protection efficiency of 98.62%.The corrosion results of the metal substrate showed that the corrosion depth of the Ce O2-GO/EP coating is only 79.407?m,with the smallest total corrosion area.The acidic medium had a high erosion capacity of the coating,but the Ce O2-GO/EP coating still has a certain degree of corrosion resistance.In this paper,the growth of Ce O2 nanoparticles is used to improve the characteristics of easy stacking between layers of go,and at the same time,Ce O2's own anti-corrosion performance is brought into play.Both of them work together to prevent the corrosion of corrosive medium to the metal substrate and enhance the anti-corrosion performance of the coating.The research results of this paper provide new materials and new ways for metal corrosion protection,and have broad application prospects in the field of metal corrosion and protection. |
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