In the process of oil and gas exploration, the corrosion of carbon steel pipes results in substantial economic losses, numerous casualties, environmental contamination, and resource waste. The advancement of highly efficient and stable corrosion inhibitors holds significant importance for protecting carbon steel from corrosion during oil and gas exploitation. In this study, two new cationic Gemini surfactants (2C_ncoesT, where n = 12, 14) were synthesized through a straightforward two-step reaction. Weight-loss tests demonstrated that the inhibition efficiency (η_w%) increases with the increase in temperature. Specifically, the maximum η_w% values for 2C₁₂coesT and 2C₁₄coesT were 98.0% and 98.3% respectively at 85 °C. The adsorption of these surfactants conformed to the Langmuir adsorption isotherm. Electrochemical measurements suggested that the two surfactants functioned as mixed-type inhibitors. The findings obtained from scanning electron microscopy (SEM) were consistent with the experimental outcomes that 2C₁₂coesT and 2C₁₄coesT are efficient corrosion inhibitors for the metal in an acidic environment. The quantum chemical investigation and molecular dynamics simulation (MD) further substantiated the experimental results and offered insights for a deeper comprehension of the inhibition mechanism of Gemini surfactants.

中文翻译：

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阳离子 Gemini 表面活性剂作为 15% HCl 碳钢缓蚀剂的实验和计算研究


在油气勘探过程中，碳钢管的腐蚀造成了巨大的经济损失、大量的人员伤亡、环境污染和资源浪费。高效、稳定的缓蚀剂的进步对于保护碳钢在石油和天然气开采过程中免受腐蚀具有重要意义。在这项研究中，通过简单的两步反应合成了两种新的阳离子 Gemini 表面活性剂 （2C_ncoesT，其中 n = 12， 14）。失重试验表明，抑制效率 （η_w%） 随着温度的升高而增加。具体而言，在 85 °C 时，2C₁₂coesT 和 2C₁₄coesT 的最大 η_w% 值分别为 98.0% 和 98.3%。 这些表面活性剂的吸附符合 Langmuir 吸附等温线。电化学测量表明，这两种表面活性剂起着混合型抑制剂的作用。扫描电子显微镜 （SEM） 获得的结果与 2C₁₂coesT 和 2C₁₄coesT 是酸性环境中金属的有效缓蚀剂的实验结果一致。量子化学研究和分子动力学模拟 （MD） 进一步证实了实验结果，并为更深入地理解 Gemini 表面活性剂的抑制机制提供了见解。