Layer by layer method was used to modify the surface of CeO2 nanoparticles as an effective corrosion inhibitive pigment for epoxy coatings by researchers from Iran and Turkey. First of all, the surface of CeO2 nanoparticles was coated by polyaniline via oxidative polymerization and then the imidazole layer was formed on polyaniline due to opposite electrostatic charges. The modification was characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), Dynamic light scattering (DLS) and Zeta potential (ZP) and Transmission electron microscopy (TEM) while electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM) were used for the anticorrosion performance of epoxy coating on mild steel.

The results showed that the optimum percentage of embedded CeO2 nanoparticles in the epoxy coating (unmodified and imidazole modified) was 0.5 wt% in which the coating has minimum agglomeration and appropriate corrosion resistance. Moreover, epoxy containing 0.5 wt% of imidazole modified CeO2 nanoparticles at the end of immersion time showed lower water uptake than the one containing unmodified CeO2 nanoparticles.

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This article is published in Progress in Organic Coatings, Volume 122, September 2018, Pages 56-63.