酰胺
胺气处理
铵
吸附
腐蚀
碳钢
二乙烯三胺
朗缪尔吸附模型
缓蚀剂
电化学
化学
无机化学
水溶液
极化(电化学)
溶解度
材料科学
有机化学
核化学
物理化学
电极
作者
Dheeraj Singh Chauhan,M.A. Quraishi,Mohammad A. Jafar Mazumder,Shaikh A. Ali,Norah Aljeaban,Bader Alharbi
标识
DOI:10.1016/j.molliq.2020.113917
摘要
Methyl 11-bromoundecanoate [Br (CH2)10CO2Me] (1) on treatment with tripropylamine gave quaternary salt [Pr3N+(CH2)10CO2Me]Br− (2) which on treatment with diethylenetriamine afforded [Pr3N+(CH2)10CONH(CH2)2NH(CH2)2NH2] Br− (3) containing inhibitive motifs of ammonium, amide and amine motifs embedded in a single frame. The precursor salt 2 and its derivative 3 were successfully synthesized in excellent yields and characterized using different spectroscopic techniques. For the first time, a detailed study on the corrosion inhibition behavior of corrosion inhibitors 2 and 3 for mild steel in 1 M HCl was carried out using electrochemical measurements and comprehensive computational analysis. Both the studied inhibitors showed excellent aqueous solubility. The high inhibition efficiency of 91% and 93% at a concentration of 200 mg L−1 was obtained for corrosion inhibitors 2 and 3, respectively. The adsorption of the corrosion inhibitors exhibited the Langmuir isotherm with a mixture of physical and chemical modes of adsorption. The impedance studies showed a rise in the polarization resistance with increasing concentration of the inhibitors. Polarization measurements demonstrated that the inhibitors displayed a mixed-mode of inhibition with primarily cathodic nature. Surface analytical studies supported the inhibitor adsorption and a protective film formation on the carbon steel surface, which improved the surface smoothness of the steel surface. The DFT based quantum chemical calculations supported the experimentally obtained results and showed that the inhibitor 3 displays superior inhibition in comparison to the inhibitor 2. The Monte Carlo simulations revealed higher adsorption energy for the inhibitor 3 compared to 2.
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