SiO2-Graphene composited materials can be used as anti-corrosion barriers, which were dispersed inwaterborne epoxy-acrylic (EA) resin. Under the same mass of SiO2 and Gr, the particle size of SiO2determines the particle number and surface area, which further influence the coverage of Gr on SiO2 andtheir anticorrosion performance. In this research, SiO2 spheres with three different particle sizes (150,400, 500 nm) were used to composite with graphene (Gr), and they were linked by bi-functional ligandpara-aminobenzoic acid(P), and the designed SiO2-P-Gr were dispersed in EA resin as anticorrosionbarriers, and the influence of SiO2 particle size is focused. SiO2-P-Gr barrier can greatly reduce thecorrosion current density icorr, from 3.2×10-7 A/cm2(pure EA coating) to 5.1×10-9 A/cm2(EA+150nmSiO2+P+Gr coating), due to the increased resistances for charge transfer (according to EISfitting) of SiO2+P+Gr barrier. Especially, 500nmSiO2-P-Gr exhibited excellent shield in both low andhigh frequency region according to Bode plot, which may be attributed to the different graphenecoverage on the SiO2 particles with different size under the same mass control.
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