Abstract

(2E)-2-(acetylamino)-3-(4-nitrophenyl)prop-2-enoic acid (NPP) was synthesized following a facile chemical method from 4-nitrobenzaldehyde (NB) and thoroughly characterized using spectroscopic techniques. These compounds were applied as novel inhibitors for corrosion of mild steel in 1M HCl using various methods such as absorbance difference, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results indicate that these inhibitors show an excellent protection performance and achieve the corrosion inhibition efficiency values of 94% and 84% for NPP and NB, respectively. The adsorption of these molecules obeys the El-Awady isotherm model. The surface analysis of mild steel was investigated using scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) methods. Furthermore, quantum chemical calculations were investigated using DFT method at B3LYP/6-31G (d,p) computed by Gaussian 09 showing a good correlation with the experimental results.

Graphic abstract

Synopsis A novel corrosion inhibitor namely 4-nitrobenzaldehyde derivative NPP was prepared and analyzed for mild steel in 1M HCl. The analysis were conducted by electrochemical, surface supported by DFT based reactivity parameters. NPP functioned by adsorption obeying the El-Awady isotherm and produced a high efficiency of 94%.

中文翻译：

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（2E）-2-（乙酰氨基）-3-（4-硝基苯基）丙-2-烯酸和4-硝基苯甲醛对低碳钢腐蚀的吸附和抑制机理的实验和理论研究

摘要

按照简便的化学方法，由4-硝基苯甲醛（NB）合成（2E）-2-（乙酰氨基）-3-（4-硝基苯基）丙-2-烯酸（NPP），并使用光谱技术对其进行全面表征。使用多种方法，例如吸光度差，电位动力学极化和电化学阻抗谱（EIS），将这些化合物用作1M HCl中低碳钢腐蚀的新型抑制剂。结果表明，这些缓蚀剂显示出优异的防护性能，对NPP和NB的缓蚀效率分别达到94％和84％。这些分子的吸附遵循El-Awady等温模型。使用扫描电子显微镜（SEM）和能量色散X射线（EDX）方法研究了低碳钢的表面分析。此外，

图形摘要

概要制备了新型缓蚀剂，即4-硝基苯甲醛衍生物NPP，并在1M HCl中分析了低碳钢。该分析是通过电化学，基于DFT的反应性参数支撑的表面进行的。NPP通过吸附遵循El-Awady等温线发挥功能，并产生94％的高效率。