International. Recently, scientists from Iran and Turkey have investigated the improvement of the anticorrosive performance of epoxy coatings by including various percentages of unmodified CeO2 nanoparticles modified with imidazole.
The surface of the CeO2 nanoparticles was modified with imidazole as an effective corrosion inhibitor pigment using the layer-by-layer method. At first, the surface of the nanoparticles was coated by polyaniline by oxidative polymerization. Then the imidazole layer was formed on polyaniline due to opposite electrostatic charges. Nanoparticle modification by imidazole was investigated using Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, thermogravimetric analysis (TGA), dynamic light scattering (DLS) and Zeta potential (ZP), and transmission electron microscopy (TEM).
The anticorrosive performance of the epoxy coating on mild steel in the presence of different concentrations of unmodified and modified CeO2 nanoparticles with imidazole (0.5, 1 and 2% by weight) was evaluated in 3.5% by weight NaCl solution by electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). The optimal percentage of CeO2 nanoparticles incorporated into the epoxy coating (not modified and modified with imidazole) was 0.5% by weight, in which the coating has minimal agglomeration and appropriate corrosion resistance.
The coating resistance of CeO2 nanoparticles modified with epoxy/imidazole 0.5% by weight after 200 hours of immersion in 3.5% NaCl solution by weight was obtained 1.19 × 107 Ωcm2 which is greater than epoxy/unmodified CeO2 nanoparticles (6.51 x 106 Ωcm2). In addition, the percentage of absorption of epoxy water containing 0.5% by weight of CeO2 nanoparticles modified with imidazole at the end of the immersion time was obtained 3.85% which was lower than the unmodified CeO2 nanoparticles (4.56%) due to the inhibitory and hydrophobicity characteristics of imidazole.
Source: https://www.sciencedirect.com
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