Abstract We demonstrated the mechanism that makes Graphene Oxide (GO) a superior material for corrosion protection over reduced graphene oxide (rGO) and nitrogen doped reduced graphene oxide (N-rGO). According to the results of our electrochemical study, supported by a host of characterization methods and density functional theory (DFT) based calculations, reduction of GO to synthesize rGO or doping of foreign heteroatoms like nitrogen to synthesize N-rGO, exposes and/or creates the defects/pores on the basal carbon plane of GO. Through these defects/pores of rGO and N-rGO, the corrodants react with the metal-surface and corrode it. A subnanometric layer of GO adhered to carbonyl iron (CI) surface through grafting by a thin Glycine (Gly) layer, repels the corrodants and shows robust corrosion protection performance in 1 M KCl solution, over a similar layer of rGO or N-rGO. Hence, our work demonstrate that a coating of GO on metallic Fe surface, grafted via a thin glycine layer, is the economical solution and has the robust performance for its direct industrial application for corrosion protection.

中文翻译：

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GO 的氧官能团在金属 Fe 的腐蚀保护中的作用

摘要 我们展示了使氧化石墨烯 (GO) 成为优于还原氧化石墨烯 (rGO) 和氮掺杂还原氧化石墨烯 (N-rGO) 的腐蚀保护材料的机制。根据我们电化学研究的结果，在大量表征方法和基于密度泛函理论 (DFT) 的计算的支持下，还原 GO 以合成 rGO 或掺杂氮等外来杂原子以合成 N-rGO，暴露和/或产生GO基础碳平面上的缺陷/孔。通过 rGO 和 N-rGO 的这些缺陷/孔，腐蚀剂与金属表面发生反应并腐蚀它。GO 亚纳米层通过由甘氨酸 (Gly) 薄层接枝而粘附在羰基铁 (CI) 表面，排斥腐蚀剂并在 1 M KCl 溶液中显示出强大的腐蚀保护性能，在类似的 rGO 或 N-rGO 层上。因此，我们的工作表明，通过薄甘氨酸层接枝在金属 Fe 表面上的 GO 涂层是经济的解决方案，并且对于其直接工业应用的腐蚀防护具有强大的性能。