In this report, three novel sulphonamides based cationic surfactants have been produced, and their structure configurations were clarified by various spectroscopic approaches (¹³C and ¹H NMR). The corrosion protection characteristics of the as-prepared compounds for C1018-steel in carbon dioxide saturated 3.5% NaCl has been inspected and categorized by weight loss, Tafel polarization (PDP), electrochemical impedance spectroscopy (EIS), X-ray photoelectron spectroscopy (XPS), field emission-scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectroscopy (EDX) methods. Furthermore, conductivity and surface-active features were applied to examine their micellization and adsorption. The outcomes exhibited that these bioactive inhibitors at low doses had a worthy protection capacity on C1018-steel corrosion under sweet conditions ranged from 94.5 to 99.5% at 5 × 10⁻⁴ M additive concentration. PDP profiles display that the as-prepared surfactants were mixed inhibitors, and their adsorption followed the Langmuir isotherm model. FESEM, EDX, and XPS examinations demonstrated the formation of a protecting film adsorbed surfactant at metal/medium interface. DFT calculations, Monte Carlo (MC) simulations, molecular electrostatic potential (MEP), Fukui indices, and Mulliken atomic charges were accomplished to support empirical outcomes, and deliver suitable insight into the adsorption features and the corrosion inhibition mechanisms of the titled surfactants.

在本报告中，生产了三种新型的基于磺酰胺的阳离子表面活性剂，并通过各种光谱方法（¹³ C和¹1 H NMR）。通过重量损失，Tafel极化（PDP），电化学阻抗谱（EIS），X射线光电子能谱（XPS）检查并分类了所制备的C1018钢在二氧化碳饱和的3.5％NaCl中的腐蚀防护特性。 ），场发射扫描电子显微镜（FE-SEM）和能量色散X射线光谱（EDX）方法。此外，电导率和表面活性特征被应用于检查它们的胶束化和吸附。结果表明，这些低剂量的生物活性抑制剂对甜味条件下的C1018钢腐蚀具有有价值的保护能力，在5×10 ^-4时范围为94.5至99.5％。 M添加剂浓度。PDP图谱表明，所制备的表面活性剂是混合抑制剂，其吸附遵循Langmuir等温线模型。FESEM，EDX和XPS检查表明，在金属/介质界面处形成了保护膜吸附的表面活性剂。DFT计算，蒙特卡洛（MC）模拟，分子静电势（MEP），Fukui指数和Mulliken原子电荷已完成以支持经验结果，并提供了对标题表面活性剂的吸附特征和缓蚀机理的适当见解。