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Electrochemical and surface evaluation of the anti-corrosion properties of reduced graphene oxide

机译：石墨烯氧化物抗腐蚀性能的电化学和表面评价

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摘要

Herein, reduced graphene oxide nanosheets (RGON) were electrochemically grown onto a carbon steel alloy from graphene oxide (GO). The produced RGON was characterized using FT-IR, Raman, XRD, SEM and TEM techniques. Then, the anti-corrosion performance of the RGON-deposited layers was evaluated by weight loss and electrochemical methods such as open circuit potential (OCP), potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) in NaCl 3.5%. Covering the surface with RGON led to a negative shift in the corrosion potential (E-corr) and a decrease in the slope of the cathodic (beta(c)) and anodic (beta(a)) reactions, in which both demonstrate that the RGON can hinder the corrosion reaction. Parameters affecting film formation and consequently anti-corrosion performance, such as applied voltage and deposition time, were optimized. After applying 12 V during 180 s, the formed RGON layer on carbon steel showed the lowest corrosion current density (J(corr)) and corrosion rate (CR), and the highest charge transfer resistance (R-ct). Finally, the morphology of the uncovered surface and that covered by RGON after 72 h immersion in NaCl 3.5%, was studied using SEM and EDXA techniques. The observed results are presented and discussed here.
机译：这里，将还原的石墨烯纳米片（RGON）电化学生长在石墨烯氧化物（GO）上的碳钢合金上。使用FT-IR，拉曼，XRD，SEM和TEM技术表征生产的RGON。然后，通过重量损失和电化学方法评估RGON沉积层的抗腐蚀性能，例如NaCl 3.5％的开路电位（OCP），电位偏振和电化学阻抗光谱（EIS）。用RGON覆盖表面导致腐蚀电位（E-COR）的负变换和阴极（β（c））和阳极（β（a））反应的斜率下降，其中表明了RGON可以阻碍腐蚀反应。优化影响膜形成的参数，从而进行抗腐蚀性，例如施加的电压和沉积时间。在180秒期间施加12 V之后，碳钢上的形成的RGON层显示出最低的腐蚀电流密度（J（COR））和腐蚀速率（CR）和最高电荷转移电阻（R-CT）。最后，使用SEM和EDXA技术研究了NaCl 3.5％72h浸没后覆盖表面和RGON覆盖的形态。这里介绍和讨论了观察结果。

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