In this work, waterborne epoxy resin E44 and graphene were employed as the matrix and nanofiller, respectively, to construct composite coatings with enhanced anticorrosion performance. XRD pattern and TEM observation indicated that the obtained graphene had a stacked structure of few-layer graphitic sheets with numbers of wrinkles. SEM observations revealed that no defects or microcracks existed on the surface of graphene/epoxy coatings and the internal micropores and microcracks were filled by graphene. FTIR spectra displayed that all the characteristic absorption peaks were attributed to the epoxy resin cured with polyamide. The Tafel polarization curves showed that, as the graphene addition amount increased, the corrosive potential increased and the corrosive current decreased. ESI results proved that the addition of graphene into epoxy coatings could not only increase the impedance arc in Nyquist plots, but also increase the impedance modulus at low frequency. Finally, the enhanced anticorrosion mechanism was proposed and discussed.

在这项工作中，水性环氧树脂E44和石墨烯分别用作基质和纳米填料，以构建具有增强的防腐性能的复合涂料。XRD图谱和TEM观察表明，所得石墨烯具有数层起皱的多层石墨片的堆叠结构。SEM观察表明，石墨烯/环氧树脂涂层的表面上没有缺陷或微裂纹，并且内部的微孔和微裂纹被石墨烯填充。FTIR光谱表明，所有特征吸收峰均归因于聚酰胺固化的环氧树脂。Tafel极化曲线表明，随着石墨烯添加量的增加，腐蚀电位增加，腐蚀电流减少。ESI结果证明，在环氧涂料中添加石墨烯不仅可以增加Nyquist图的阻抗电弧，而且可以增加低频时的阻抗模量。最后，提出并讨论了增强的防腐机理。