Abstract

It has recently been synthesized a Schiff base (E)-2-hydroxy-5-(2-benzylidene) aminobenzoic acid and characterized by FTIR, UV–vis and ¹H NMR analysis. The electrochemical behaviour of mild steel in 1.0 M HCl solutions in the absence and presence of Hha has been investigated by electrochemical techniques such as potentiodynamic polarization and electrochemical impedance spectroscopy. The inhibition efficiency was found to increase with rise in concentration of synthesized molecule. Scanning electron microscopy observations of mild steel surface confirmed the existence of such an adsorbed film. Contact angle on the metal surface was also measured. Computational analyses of (E)2-hydroxy-5-((2-hydroxybenzylidene) amino benzoic acid were done at B3LYP/6-31G(d) level in gas phase. Sensitivity of this compound towards Fe²⁺ and Fe³⁺ ions were determined. Interaction mechanism was proposed.

中文翻译：

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（E）-2-羟基-5-（2-亚苄基）氨基苯甲酸对1.0 M HCl溶液中低碳钢腐蚀行为的抑制作用

摘要

最近合成了席夫碱（E）-2-羟基-5-（2-亚苄基）氨基苯甲酸，其特征在于FTIR，UV-vis和¹1 H NMR分析。在不存在和存在Hha的情况下，在1.0 M HCl溶液中低碳钢的电化学行为已通过电化学技术（如电位动力学极化和电化学阻抗谱）进行了研究。发现抑制效率随着合成分子浓度的增加而增加。低碳钢表面的扫描电子显微镜观察证实了这种吸附膜的存在。还测量了金属表面上的接触角。在气相中B3LYP / 6-31G（d）浓度下进行了（E）2-羟基-5-（（2-羟基亚苄基）氨基苯甲酸的计算分析，该化合物对Fe ²⁺和Fe ³⁺离子的敏感性确定相互作用机制。