Abstract Present investigation measures corrosion inhibition capabilities of thiadiazoline compounds; DFAT [2-4(difuran-2-yl-3-azabicyclo[3.3.1] nonan-9-yl-)-5-spiro-4-acetyl-2-acetylamino-1,3,4-thiadiazoline] and DIAT [2-4(di-1H indole-3-yl-3-azabicyclo[3.3.1]nonan-9-yl-)-5-spiro-4-acetyl-2-acetylamino-1,3,4-thiadiazoline] for petroleum oil well/tubing steel (N80 steel) in 15% HCl with the help of different techniques. The studied organic compounds show excellent corrosion mitigation properties with highest efficiency of 96.02% for DFAT and 97.05% for DIAT at a very small dosage of 50 ppm and 303 K temperature. Adsorption of both inhibitor molecules on the surface of N80 steel obeyed Langmuir adsorption isotherm. Potentiodynamic polarization studies revealed that both the compounds act as mixed type corrosion inhibitor and adsorb at the cathodic as well as anodic sites to mitigate corrosion process. The surface study was done through SEM, EDX, AFM, FT-IR and XPS analysis. The theoretical analysis (DFT and Monte Carlo simulations) of both inhibitors correlates the experimental findings.

中文翻译：

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使用噻二唑啉作为高效缓蚀剂对石油油井/管钢的腐蚀保护：实验和理论研究

摘要 目前的研究测量了噻二唑啉化合物的缓蚀能力；DFAT [2-4(difuran-2-yl-3-azabicyclo[3.3.1] nonan-9-yl-)-5-spiro-4-acetyl-2-acetylamino-1,3,4-thiadiazoline] 和 DIAT [2-4(di-1H indole-3-yl-3-azabicyclo[3.3.1]nonan-9-yl-)-5-spiro-4-acetyl-2-acetylamino-1,3,4-thiadiazoline]借助不同技术，在 15% HCl 中用于石油油井/管钢（N80 钢）。所研究的有机化合物显示出优异的缓蚀性能，在 50 ppm 和 303 K 温度下，DFAT 的最高效率为 96.02%，DIAT 的效率最高为 97.05%。两种抑制剂分子在N80钢表面的吸附均服从Langmuir吸附等温线。动电位极化研究表明，这两种化合物均作为混合型缓蚀剂并吸附在阴极和阳极位点以减轻腐蚀过程。表面研究是通过 SEM、EDX、AFM、FT-IR 和 XPS 分析完成的。两种抑制剂的理论分析（DFT 和蒙特卡罗模拟）与实验结果相关。