Adsorption and Quantum Chemical Studies on the Inhibition Potential of Mannich Base for the Corrosion of Brass in Acid Medium

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• 作者：N. Zulfareen ; K. Kannan ; T. Venugopal…
• 关键词：Mannich base ; Brass ; Acid corrosion ; EIS ; CV ; DFT
• 刊名：Arabian Journal for Science and Engineering
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：42
• 期：1
• 页码：125-138
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Science, Humanities and Social Sciences, multidisciplinary;
• 出版者：Springer Berlin Heidelberg
• ISSN：2191-4281
• 卷排序：42

文摘

N-(morpholinomethyl) nicotinamide (MMN) a Mannich base was synthesized and characterized by FTIR, \({^{1}{\rm H}}\) NMR, and \({^{13}{\rm C}}\) NMR. The high corrosion inhibition efficiency of N-(morpholinomethyl) nicotinamide (MMN) on brass in 1 M HCl solution was reported using weight loss, potentiodynamic polarization, electrochemical impedance spectroscopy, and cyclic voltammetry methods. The corrosion mechanism of MMN was explained by some parameters like free energy, entropy, and enthalpy. The maximum inhibition efficiency of MMN was found to be 93.16 % at \({60 ^{\circ}{\rm C}}\). Polarization measurement reveals that MMN acts as a mixed-type inhibitor. Thermodynamic parameter implies that MMN obeys Langmuir adsorption isotherm. The high corrosion inhibition efficiency was proved by quantum chemical indices using density functional theory and surface morphology using SEM.