The corrosion resistance properties of epoxy coatings applied to St37 carbon steel were modified with polysulfide and nano cerium oxide. The surface chemistry of the epoxy/polysulfide coating was studied by Fourier Transform Infrared Spectroscopy (FTIR), which confirmed the presence of thiol group. The toughness and corrosion properties of epoxy/polysulfide composites were investigated by cupping and Electrochemical Impedance Spectroscopy (EIS) tests, respectively. Results showed that the addition of 10 wt. % of polysulfide to epoxy, led to a notable increase in toughness and corrosion resistance. Epoxy/polysulfide/CeO2 nanocomposites were prepared by incorporating 0.5, 1, 2, 4, and 6 wt. % of CeO2 nanoparticles into the epoxy coating with 10 wt. % of polysulfide. Field Emission Scanning Electron Microscopy (FESEM) observations indicated the uniform dispersion of 1 wt. % nano CeO2, and agglomeration of higher concentrations of particles in the composite. The effect of nano-CeO2 on the corrosion behavior of the coatings was investigated in a 3.5% NaCl solution using EIS, and salt spray tests. The adhesion strength of the nanocomposites was measured by a pull-off adhesion tester. Results revealed that incorporation of 1 wt. % CeO2 nanoparticles significantly increased the corrosion resistance and adhesion strength of the epoxy/polysulfide coatings.

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