Novel quinoline derivatives as green corrosion inhibitors for mild steel in acidic medium: Electrochemical, SEM, AFM, and XPS studies
Novel quinoline derivatives as green corrosion inhibitors for mild steel in acidic medium: Electrochemical, SEM, AFM, and XPS studies
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DOI：
10.1016/j.molliq.2015.12.086
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发表时间：
2016-04
影响因子：
6
通讯作者：
Priyanka Singh;V. Srivastava;M. Quraishi
中科院分区：
文献类型：
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作者：
Priyanka Singh;V. Srivastava;M. Quraishi
2-氨基-7-羟基-4-苯基-1,4-二氢喹啉-3-甲腈(Q-1)、2-氨基-7-羟基-4-(对甲苯基)-1,4二氢喹啉-3-甲腈(Q-2)、2-氨基-7-羟基-4-(4-甲氧基苯基)-1,4二氢喹啉-3等喹啉衍生物的缓蚀作用使用失重、电化学阻抗谱 (EIS) 和动电位极化分析甲腈 (Q-3)、2-氨基-4-(4-(二甲氨基)苯基)-7-羟基-1,4-二氢喹啉-3-甲腈 (Q-4)。在所有研究的抑制剂中，Q-4 在 150 mg/l 浓度下的最大抑制效率为 98.09%。电化学阻抗谱（EIS）测量表明，腐蚀抑制是由于抑制剂分子吸附在金属表面而发生的。动电位极化测量表明Q-1、Q-2、Q-3充当混合型抑制剂，而Q-4充当阴极抑制剂。喹啉在低碳钢表面的吸附遵循Langmuir吸附等温线。表面分析技术（SEM/AFM/XPS）进一步证实腐蚀抑制是由于缓蚀剂分子在金属/溶液界面的吸附而发生的。
The corrosion mitigation effect of quinoline derivatives such as 2-amino-7-hydroxy-4-phenyl-1,4-dihydroquinoline-3-carbonitrile (Q-1), 2-amino-7-hydroxy-4-(p-tolyl)-1,4 dihydroquinoline-3-carbonitrile (Q-2), 2-amino-7-hydroxy-4-(4-methoxyphenyl)-1,4 dihydroquinoline-3 carbonitrile (Q-3), 2-amino-4-(4-(dimethylamino)phenyl)-7-hydroxy-1,4-dihydroquinoline-3-carbonitrile (Q-4) were analyzed using weight loss, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarizations. Among all the investigated inhibitors, Q-4 showed the maximum inhibition efficiency of 98.09% at 150 mg/l. The electrochemical impedance spectroscopy (EIS) measurements revealed that corrosion inhibition takes place due to the adsorption of inhibitor molecules on the metal surface. The potentiodynamic polarization measurements show that Q-1, Q-2, Q-3 act as a mixed-type inhibitor while Q-4 acts as a cathodic inhibitor. The adsorption of quinolines on mild steel surface obeyed the Langmuir adsorption isotherm. The surface analysis techniques (SEM/AFM/XPS) further corroborate that the corrosion inhibition occurs due to the adsorption of the inhibitor molecules at the metal/solution interface.