An improved strategy to synthesize graphite oxide with controllable interlayer spacing as coatings for anticorrosion application |
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Authors: | Hao Zheng Yusheng Cheng Ranran Zhao Ying Ye Jianfang Chen |
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Affiliation: | 1. Institute of Marine Chemistry and Environment, Ocean College, Zhejiang University, Zhoushan, China;2. Ocean College, Zhejiang University, Zhoushan, China;3. Key Lab of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou, China |
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Abstract: | A facile method to synthesize nanoscale graphene oxide (GO) with controllable interlayer spacing was carried out using two-step oxidation process and much less acid to improve the efficiency of the oxidation. The X-ray diffraction results demonstrated that GO had been successfully prepared from graphite because of disappearance of characteristic peaks of pristine graphite at about 2θ = 26.5° along with appearance of a sharp major peak of GO at about 2θ = 9.4°. The increased basal spacing d001 of as-prepared GO could reach as high as 9.39 Å, suggesting higher degree of oxidation than that prepared by the classical Hummers' synthesis, and characterization results from Fourier transform infrared spectrometer, X-ray photoelectron spectroscopy, Raman spectroscopy, scanning electron microscopy and transmission electron microscopy further confirmed this conclusion. The influence of GO on anti-corrosion performance of nanocomposite coatings composited with the 2,5-dimethoxyaniline (DMA) conductive polymer was examined via potentiodynamic polarization curve tests in 3.5 wt% NaCl aqueous solution. The results demonstrated that the incorporation of GO significantly decreased the corrosion current density (icorr = 2.62 μA/cm2) in the case of GO-PDMA coating, reflecting excellent physical isolation of GO and its synergistic effect with PDMA against the infiltration of water and corrosive electrolyte. |
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Keywords: | corrosion graphene oxide interlayer spacing synthesis and characterization |
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