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Corrosion inhibition of mild steel in hydrochloric acid by some pyridine derivatives: An experimental and quantum chemical study

机译:吡啶衍生物对盐酸中低碳钢的腐蚀抑制作用:实验和量子化学研究

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摘要

The adsorption and corrosion inhibition effect of three pyridine derivatives namely 2-amino-6-methoxy-4-(4-methoxylphenyl) pyridine-3,5-dicarbonitrile (PC-1), 2-amino-6-methoxy-4-(4-methylphenyl) pyridine-3,5-dicarbonitrile (PC-2) and 2-amino-6-methoxy-4-phenylpyridine-3,5-dicarbonitrile (PC-3) on mild steel in 1 M HCl was investigated using gravimetric, electrochemical impedance spectroscopy, potentiodynamic polarization techniques and quantum chemical study. PCs are mixed-type inhibitor mainly cathodic. Activation energy (E-a), equilibrium constant (K-ads), free energy of adsorption (Delta G(ads)(o)) were calculated and discussed. The studied inhibitors (PCs) obeyed Langmuir's adsorption isotherm. Protective film of PCs on mild steel surface was investigated by using SEM and EDX. Quantum chemical parameters were carried out in the framework of the density functional theory (DFT). (C) 2014 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
机译:2-氨基-6-甲氧基-4-(4-甲氧基苯基)吡啶-3,5-二甲腈(PC-1),2-氨基-6-甲氧基-4-(3种吡啶衍生物)的吸附和缓蚀作用用重量分析法研究了在1 M HCl中低碳钢上的4-甲基苯基)吡啶-3,5-二碳腈(PC-2)和2-氨基-6-甲氧基-4-苯基吡啶-3,5-二碳腈(PC-3) ,电化学阻抗谱,电位动力学极化技术和量子化学研究。 PCs是主要是阴极的混合型抑制剂。计算并讨论了活化能(E-a),平衡常数(K-ads),吸附自由能(Delta G(ads)(o))。所研究的抑制剂(PCs)符合Langmuir的吸附等温线。利用SEM和EDX对低碳钢表面的PC保护膜进行了研究。量子化学参数是在密度泛函理论(DFT)的框架内进行的。 (C)2014韩国工业和工程化学学会。由Elsevier B.V.发布。保留所有权利。

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