Abstract
Due to its special two-dimensional lamellar structure, graphene possesses an excellent shielding effect, hydrophobic characteristics and large specific surface area, which can effectively isolate the internal structure from the external corrosive media. However, lamellar graphene is easy to stack and agglomerate, which limits its anti-corrosion performance. In this paper, cerium oxide-graphene oxide (CeO2-GO) nanocomposites were prepared by a hydrothermal synthesis method. Field emission scanning electron microscope (FESEM) and transmission electron microscope (TEM) were applied for microstructure examination, showing that a large number of nanoscale granular cerium oxide grew on the lamellar graphene oxide surface, which improved the dispersion performance of graphene inside the matrix. The anti-corrosion properties of the coating were analyzed and illustrated by open circuit potential (OCP), frequency response analysis, Tafel curve and Mott–Schottky curve. The results indicated that the CeO2-GO (4:1) nanocomposite not only eliminated the agglomeration of graphene to some extent, but also prepared the graphene epoxy coating with good dispersion, which further promoted its anti-corrosion performance. The paper proposed a feasible solution for GO dispersion in cement-based materials and lays a solid theoretical foundation for the engineering application of cerium oxide-graphene oxide modified anticorrosive coating.
Highlights
Metal is a widely used building structural material with excellent bending and tensile properties, while the metal corrosion is an unavoidable issue
CeO2 -graphene oxide (GO) nanocomposites with different mass ratios were prepared by hydrothermal synthesis method
The anticorrosion performance of EP/ CeO2 -GO coatings was analyzed by electrochemical means
Summary
Metal is a widely used building structural material with excellent bending and tensile properties, while the metal corrosion is an unavoidable issue. In the process of corrosion, chemical or electrochemical reactions will occur at the interface of metal materials, which results in a significant degradation of strength, plasticity, toughness and other mechanical properties of metal materials, further destroying the geometric shape of metal components and shorten the service life of the structure. These leads to huge economic losses and energy waste. The direct economic loss caused by metal corrosion is as high as 250 million us dollars every year [3,4]
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