Protection of metal surfaces from corrosion by environmentally friendly coating is found to be an interesting and useful research topic. In this milieu, the authors presented an environment friendly bio-based waterborne polyester thermoset as an anticorrosive organic coating. The polyesters comprise renewable resource based citric acid, dimer acid and glycerol along with citric acid functionalized reduced graphene oxide. Three different compositions of the polyester were produced by varying the amount (0.1, 0.5, and 1 weight%) of functionalized reduced graphene oxide. The structural and morphological attributes of these polyesters were evaluated by Fourier transform infrared spectroscopic, X-ray diffraction, Raman spectroscopic, scanning electron microscopic, and transmission electron microscopic studies. The thermosets of the resinous polyesters were obtained by curing them with bio-based glycerol containing epoxy and fatty acid modified poly(amido amine). The thermosets exhibited high tensile strength (18.68–26.94 MPa), elongation at break (176%–471%), toughness (22.74–86.5 MJ/m³), thermal stability (up to 222°C), biodegradability and chemical resistance. Potentiodynamic polarization and electrochemical impedance spectroscopic studies clearly revealed excellent corrosion resistance (impedance of the order of 10⁷ ohm cm² and highest phase angle of 88.2°) of the mild steel coated plates. Thus, the formulated polyester thermosets could be used as a promising environment friendly high performing anticorrosive material.

中文翻译：

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柠檬酸功能化还原氧化石墨烯生物基水性聚酯热固性作为优良防腐材料

通过环保涂层保护金属表面免受腐蚀是一个有趣且有用的研究课题。在这种环境下，作者提出了一种环境友好的生物基水性聚酯热固性塑料作为防腐有机涂料。聚酯包含基于可再生资源的柠檬酸、二聚酸和甘油以及柠檬酸功能化的还原氧化石墨烯。通过改变官能化还原氧化石墨烯的量（0.1、0.5 和 1 重量％），生产了三种不同的聚酯组合物。这些聚酯的结构和形态属性通过傅里叶变换红外光谱、X 射线衍射、拉曼光谱、扫描电子显微镜和透射电子显微镜研究进行评估。树脂聚酯的热固性是通过用含有环氧和脂肪酸改性的聚（酰胺胺）的生物基甘油固化它们而获得的。热固性塑料表现出高拉伸强度 (18.68–26.94 MPa)、断裂伸长率 (176%–471%)、韧性 (22.74–86.5 MJ/m³）、热稳定性（最高222°C）、生物降解性和耐化学性。动电位极化和电化学阻抗谱研究清楚地表明低碳钢涂层板具有出色的耐腐蚀性（阻抗约为 10 ⁷  ohm cm ^{2和最高相位角为 88.2°）。}因此，配制的聚酯热固性材料可用作一种有前途的环境友好型高性能防腐材料。