Abstract Iron-based alloys that are ubiquitously used in industrialized societies are prone to corrosion which results in large maintenance and repair costs. Here we design maleic-anhydride-functionalized graphene nanofillers to enhance corrosion resistance of epoxy coating (MAGE) on mild steel surfaces, with a corrosion protection efficiency of 99.9%. A mechanochemical approach based on Diels-Alder reaction was used to synthesize graphene nanofillers and functionalize them with difunctional bisphenol A/epichlorohydrin epoxy. The MAGE coating increased corrosion resistance of steel by 9–10 orders of magnitude compared to bare metal in both abiotic (3.5% NaCl) and aggressive microbial (sulfate-reducing bacteria, SRB) environments. Compared to unfunctionalized graphene nanoplatelets, the MAGE coating offered four orders of magnitude lower corrosion resistance against planktonic SRB cells, 80% lower against sessile SRB cells, and 19-fold lower against 3.5% NaCl. The unique functional groups in maleic-anhydride-graphene adducts enabled their dispersion in epoxy coating and enhanced its mechanical properties. The high corrosion resistance of MAGE in diverse environments is attributed its outstanding ability to block the intercalation of corrosive species.

中文翻译：

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马来酸酐官能化石墨烯纳米填料使环氧涂层具有高度的耐腐蚀和抗微生物侵袭性

摘要 在工业化社会中普遍使用的铁基合金容易腐蚀，从而导致大量的维护和维修成本。在这里，我们设计了马来酸酐官能化石墨烯纳米填料，以提高低碳钢表面环氧涂层 (MAGE) 的耐腐蚀性，腐蚀保护效率为 99.9%。基于 Diels-Alder 反应的机械化学方法用于合成石墨烯纳米填料并用双官能双酚 A/环氧氯丙烷对其进行功能化。在非生物（3.5% NaCl）和侵蚀性微生物（硫酸盐还原菌，SRB）环境中，与裸金属相比，MAGE 涂层将钢的耐腐蚀性能提高了 9-10 个数量级。与未功能化的石墨烯纳米片相比，MAGE 涂层对浮游 SRB 细胞的耐腐蚀性降低了四个数量级，对固着的 SRB 细胞降低了 80%，对 3.5% NaCl 降低了 19 倍。马来酸酐-石墨烯加合物中独特的官能团使其能够分散在环氧树脂涂层中并增强其机械性能。MAGE 在不同环境中的高耐腐蚀性归因于其出色的阻止腐蚀性物质嵌入的能力。