Steel reinforcement corrosion significantly reduces the durability and service life of concrete structures, particularly in chloride-rich environments such as marine and coastal areas. This study aims to reduce the corrosion rate using graphene oxide (GO) as a corrosion inhibitor. Two GO dosages (0.0005 and 0.005 wt%) were evaluated for their effectiveness in mitigating corrosion in reinforced concrete exposed to a 3.5M NaCl solution. To assess the corrosion behavior of the steel reinforcement, Open Circuit Potential (OCP), Electrochemical Impedance Spectroscopy (EIS), and Linear Polarization Resistance (LPR) were evaluated over one year by wetting/drying cycles. Oxygen permeability and electrical resistivity tests were also conducted to evaluate the concrete's susceptibility to corrosion. Both GO content demonstrated significant corrosion inhibition, with the 0.005 wt% dosage providing the most effective protection. This was evidenced by the lowest icorr values recorded during the final cycle (52), larger capacitive loops, and higher impedance in EIS results, indicating enhanced corrosion resistance. Visual inspection of steel bars further confirmed these findings, showing no signs of deterioration or discoloration in GO-modified concrete compared to steel bars extracted from reference concrete. SEM-EDS analysis revealed higher carbon content on the steel surface, suggesting GO adsorption and the formation of a protective passive layer. These results suggest that GO is a promising nanomaterial for inhibiting corrosion in steel-reinforced concrete exposed to aggressive environmental conditions.

中文翻译：

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氧化石墨烯对暴露于 3.5M NaCl 溶液的混凝土中嵌入钢筋的腐蚀抑制影响


钢筋腐蚀会显著降低混凝土结构的耐用性和使用寿命，尤其是在海洋和沿海地区等富含氯化物的环境中。本研究旨在使用氧化石墨烯 （GO） 作为缓蚀剂来降低腐蚀速率。评估了两种 GO 剂量 （0.0005 和 0.005 wt%） 在暴露于 3.5M NaCl 溶液中的钢筋混凝土中减轻腐蚀的有效性。为了评估钢筋的腐蚀行为，通过湿/干循环评估了一年内的开路电位 （OCP）、电化学阻抗谱 （EIS） 和线性极化电阻 （LPR）。还进行了透氧性和电阻率测试，以评估混凝土的腐蚀敏感性。两种 GO 含量均表现出显着的腐蚀抑制作用，其中 0.005 wt% 的剂量提供了最有效的保护。EIS结果中记录的最低iCORR值（52）、更大的电容环路和更高的阻抗证明了这一点，表明耐腐蚀性增强。对钢筋的目视检查进一步证实了这些发现，与从参考混凝土中提取的钢筋相比，GO 改性混凝土没有变质或变色的迹象。SEM-EDS 分析显示钢表面的碳含量较高，表明 GO 吸附并形成保护性钝化层。这些结果表明，GO 是一种很有前途的纳米材料，可用于抑制暴露于恶劣环境条件下的钢筋混凝土的腐蚀。