Abstract Recently, the discovery of the corrosion-promoting effect of graphene has hindered the progress in the use of graphene-based materials as anticorrosive coatings. This work proposes to avoid the corrosion-promoting effect by the introduction of favorable defects to electrochemically reduced graphene oxide (ErGO), which consisted in the hydrogenation of sp2 domains during the removal of O-groups in graphene oxide, favoring sp3 domains and low conductivity. The ErGO films were subsequently modified with 4-pentyonate chains to obtain films with lower conductivity and enhanced hydrophobicity (HrGO). The alkyne chains were bonded to the remaining sp2 domains in ErGO by a simple electrochemical process. Both films were characterized by FT-IR, XPS, Raman spectroscopy and electrochemical methods. As anticorrosive coating, the HrGO film achieved a 4-times decrease in the corrosion current and showed a longer lifetime in comparison to the ErGO film, and an 18-times decrease compared to the bare carbon steel. According to the galvanic current measurements, neither of the films presented a corrosion-promoting effect, which was attributed to their low conductivity, 13 and 1.3 S cm−1 for ErGO and HrGO, respectively. These results show that the corrosion promoting effect of graphene can be avoided using correctly engineering ErGO with adequate defects.

中文翻译：

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用炔链改性的导电性差的电化学还原氧化石墨烯薄膜，以避免石墨烯基材料对碳钢的腐蚀促进作用

摘要 近年来，石墨烯促腐蚀作用的发现阻碍了石墨烯基材料作为防腐涂层的应用进展。这项工作提出通过向电化学还原氧化石墨烯 (ErGO) 引入有利缺陷来避免腐蚀促进效应，这包括在去除氧化石墨烯中的 O 基团期间 sp2 域的氢化，有利于 sp3 域和低电导率. 随后用 4-戊酸盐链对 ErGO 膜进行改性，以获得具有较低导电性和增强疏水性 (HrGO) 的膜。炔链通过简单的电化学过程与 ErGO 中剩余的 sp2 域键合。两种薄膜均通过 FT-IR、XPS、拉曼光谱和电化学方法进行表征。作为防腐涂料，与 ErGO 膜相比，HrGO 膜的腐蚀电流降低了 4 倍，寿命更长，与裸碳钢相比，腐蚀电流降低了 18 倍。根据电流测量，这两种薄膜都没有促进腐蚀的作用，这归因于它们的低电导率，ErGO 和 HrGO 的电导率分别为 13 和 1.3 S cm-1。这些结果表明，通过正确设计具有足够缺陷的 ErGO，可以避免石墨烯的腐蚀促进作用。ErGO 和 HrGO 分别为 13 和 1.3 S cm-1。这些结果表明，通过正确设计具有足够缺陷的 ErGO，可以避免石墨烯的腐蚀促进作用。ErGO 和 HrGO 分别为 13 和 1.3 S cm-1。这些结果表明，通过正确设计具有足够缺陷的 ErGO，可以避免石墨烯的腐蚀促进作用。