Abstract
Graphene with extremely large specific surface area possesses great loading capacity for various kinds of corrosion inhibitors to obtain long-term anticorrosion properties. In this study, the corrosion inhibitor cerium nitrate was employed to modify graphene on which the cerium species were loaded. The as-synthesized cerium-modified graphene (Ce-Gr) was introduced into epoxy powder coating to provide long-effective corrosion protection on steel. X-ray photoelectron spectroscopy (XPS) analysis implies that cerium species were successfully loaded on graphene in the form of cerium nitrate and cerium oxide. Scanning electron microscopy (SEM) observation exhibited that Ce-Gr improved structural density and reduced the porosity in coating matrix. Electrochemical measurements demonstrated incredibly high impedance values of 1010.5 Ω cm2 for the epoxy powder coatings containing Ce-Gr after immersion in 3.5% NaCl solution for 45 days. Additionally, the smallest average corrosion propagation width of only 0.60 mm on the substrate at scratch after salt spray test, the shorter cathodic disbondment diameter of 3.49 mm and the fewest corrosion oxidation products with extremely low oxygen content of 3 wt% on substrate after salt solution immersion for 120 days implied that the coating with the addition of 0.05 wt% Ce-Gr possessed the most effective corrosion inhibition property to protect the steel substrate for a long period.
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