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An Intelligent and Efficient Synthesis of New Inhibitors against Corrosion of Mild Steel in Acidic Media
Surface Engineering and Applied Electrochemistry Pub Date : 2021-03-11 , DOI: 10.3103/s1068375521010026
Nadia Arrousse , Ayssar Nahlé , El Houssine Mabrouk , Rajae Salim , Fadoua El hajjaji , Zakia Rais , Mustapha Taleb

Abstract

In this present work, the theoretical study of the synthesis of methyl 2-(6-hydroxy-3-oxo-3H-xanthen-9-yl) benzoate and ethyl 2-(6-hydroxy-3-oxo-3H-xanthen-9-yl) benzoate, using the Gaussian 09 based on the hybrid density functional theory method (DFT/B3LYP/6-311G (d, p)) was done. From the obtained results, an economical method for the synthesis of these compounds with a high yield was elaborated. This method involved two steps: the first one was the preparation of the 2-(6-hydroxy-3-oxo-3H-xanthen-9-yl) benzoic acid by a reaction of an open-form fluorescein in a 1.0 M sodium hydroxide solution; and the second one was the formation of the corresponding esters using anhydrous methanol and ethanol. Those esters were characterized by conventional spectroscopic techniques, such as nuclear magnetic resonance, infrared, and mass spectroscopies. The theoretical results are in good correlation with those obtained experimentally. The analysis of the absorption spectra revealed that the synthesized compounds are colored pigments. The experimental study of the inhibition effect of those compounds on the corrosion of mild steel in a 1 M HCl solution performed using absorbance difference measurements demonstrated that the synthesized products are good inhibitors in an acidic environment at a concentration of 1.0 × 10–4 M. The surface analysis via the scanning electron microscope/dispersive X-ray technique showed that those compounds protect mild steel against corrosion by being adsorbed on its surface.



中文翻译:

一种智能高效合成新型缓蚀钢在酸性介质中的缓蚀剂

摘要

在该目前的工作中,甲基的合成2-(6-羟基-3-氧代- 3的理论研究ħ -呫吨-9-基)苯甲酸甲酯和2-(6-羟基-3-氧代-3 ħ -使用基于混合密度泛函理论方法(DFT / B3LYP / 6-311G(dp))的高斯09生成黄原酸9-基)苯甲酸酯。从获得的结果,阐述了一种经济高效地合成这些化合物的方法。该方法涉及两个步骤:第一个步骤是制备2-(6-羟基-3-氧代-3 H-黄嘌呤-9-基)苯甲酸在1.0 M氢氧化钠溶液中通过开放式荧光素反应而生成;第二种是使用无水甲醇和乙醇形成相应的酯。这些酯通过常规的光谱技术表征,例如核磁共振,红外和质谱。理论结果与实验获得的结果有很好的相关性。吸收光谱的分析表明,合成的化合物是有色颜料。使用吸光度差测量进行的这些化合物对1M HCl溶液中低碳钢腐蚀的抑制作用的实验研究表明,合成产品在1.0×10 –4的酸性环境中是良好的抑制剂 M.通过扫描电子显微镜/ X射线弥散射线技术进行的表面分析表明,这些化合物通过吸附在表面上,可以保护低碳钢免受腐蚀。

更新日期:2021-03-11
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