Abstract

Reduced graphene oxide (rGO) nanosheets are functionalized with 2-methylimidazole (2-MI) to construct a high-efficiency corrosion resistant composite for waterborne polyacrylate coatings. The functional composites are confirmed structural and morphological investigation of sheets by Fourier transform infrared spectroscopy(FT-IR), Raman, x-ray diffraction(XRD), thermogravimetry(TGA), x-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM) and transmission electron microscopy (TEM) analysis. It is found from the electrochemical test results that after inclusion of 0.5 wt.% 2-MI/rGO nanoparticles incorporation into polyacrylate coatings, the Rct increased from 4.08E03 Ω.cm² (for pure resin) to 4.02E05 Ω.cm² in 3.5 wt.% NaCl solution, and the protective efficiency is up to 98.15% for carbon steel. The effective healing process can be concluded that the shield effect of rGO composites greatly extend the diffusion path of corrosion factor and blocked the electrolyte penetration and corrosion extension.

摘要

还原氧化石墨烯 (rGO) 纳米片用 2-甲基咪唑 (2-MI) 进行功能化，以构建用于水性聚丙烯酸酯涂层的高效耐腐蚀复合材料。通过傅里叶变换红外光谱（FT-IR）、拉曼光谱、X射线衍射（XRD）、热重分析（TGA）、X射线光电子能谱（XPS）、扫描电子显微镜（ SEM) 和透射电子显微镜 (TEM) 分析。从电化学测试结果发现，在聚丙烯酸酯涂层中加入0.5 wt.% 2-MI/rGO纳米颗粒后，Rct从4.08E03 Ω.cm ²（纯树脂）增加到4.02E05 Ω.cm ²在3.5 wt.% NaCl溶液中，对碳钢的防护效率高达98.15%。有效的愈合过程可以得出结论，rGO复合材料的屏蔽效应大大延长了腐蚀因子的扩散路径，阻止了电解液的渗透和腐蚀扩展。