Mohamed the First University, Faculty of Sciences Oujda, Chemistry Department, Oujda, Morocco.
Laboratory of Separation Processes (LSP), Faculty of Sciences, IbnTofail University, Kenitra, Morocco; Laboratory of Materials, Nanotechnology and Environment, Faculty of Sciences, Mohammed V University, P.O. Box. 1014, Rabat, Morocco.
J Colloid Interface Sci. 2020 Nov 15;580:740-752. doi: 10.1016/j.jcis.2020.07.073. Epub 2020 Jul 18.
Green inhibitors are an important way to decrease the corrosion rate of different industrial metals. The present work shows the corrosion behavior of the mild steel medium (MS) in hydrochloric acid 1 M by the aqueous extract of Artemisia Herba Alba (AHA), which is an green sustainable inhibitor to reduce its corrosive action by exploiting a variety of techniques and methods namely: Weight loss, electrochemical techniques [electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP], SEM-EDX, XPS and theoretical calculations for the majority molecule. Hydrodistillation is the extraction method that has been used to prepare the aqueous extracts. Otherwise, phytochemical screening characterization of different parts of the plant was applied to show the proportions of chemical compounds that exist in the plants. The highest inhibition efficiency obtained is 92% for 0.4 g/L of AHA aqueous extract in 1 M HCl at 303 K. PDP study confirmed that the AHA extract is of mixed-kind inhibitor. A CPE, Q determined by fit and graphical methods plotted by synthetic data, was utilized. To characterize the mild steel surface, scanning electron microscopy was also used; SEM/EDX allowed the investigation of the AHA effect on the surface of mild steel specimens. To comprehend the adsorption mechanism of AHA extract for MS in the 1 M HCl, XPS technique was accomplished. Theoretical approaches based on chemical quantum calculations and molecular dynamics simulation clearly explains the mode of adsorption of the majority molecule on the iron surface.
绿色抑制剂是降低不同工业金属腐蚀速率的重要途径。本工作研究了在 1M 盐酸介质中，青蒿（Artemisia Herba Alba）水提物对低碳钢的缓蚀作用。采用多种技术和方法，如失重法、电化学技术（电化学阻抗谱（EIS）和动电位极化（PDP））、SEM-EDX、XPS 和大多数分子的理论计算，研究了青蒿水提物对低碳钢的缓蚀作用。采用水蒸馏法提取青蒿水提物。此外，还对植物的不同部位进行了植物化学成分的筛选和鉴定，以显示植物中存在的化合物比例。在 303K 下，浓度为 0.4g/L 的青蒿水提物在 1M HCl 中对低碳钢的缓蚀效率最高可达 92%。动电位极化研究证实，青蒿提取物是一种混合型抑制剂。采用拟合和图形方法确定了 CPE 和 Q 值，并利用合成数据进行了绘制。为了表征低碳钢表面，还使用了扫描电子显微镜；SEM/EDX 允许研究 AHA 对低碳钢试样表面的影响。为了理解 AHA 提取物在 1M HCl 中对 MS 的吸附机制，完成了 XPS 技术。基于化学量子计算和分子动力学模拟的理论方法清楚地解释了大多数分子在铁表面的吸附模式。
