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N,N′-Dialkylcystine Gemini and Monomeric N-Alkyl Cysteine Surfactants as Corrosion Inhibitors on Mild Steel Corrosion in 1 M HCl Solution: A Comparative Study
ACS Omega ( IF 4.1 ) Pub Date : 2017-09-11 00:00:00 , DOI: 10.1021/acsomega.7b00501
Ruby Aslam 1 , Mohammad Mobin 1 , Saman Zehra 1 , Ime B. Obot 2 , Eno E. Ebenso 3
Affiliation  

Gemini surfactant, N,N′-dialkylcystine 2(C12Cys), derived from cystine, and a monomeric N-alkyl cysteine counterpart, (C12Cys), were synthesized and purified. The characterization of surfactants 2(C12Cys) and (C12Cys) was made by Fourier transform infrared, 1H NMR, and elemental analysis. The effect of 2(C12Cys) and (C12Cys) on mild steel (MS) corrosion in 1 M HCl solution was explored as a function of their concentration and electrolyte temperature by means of gravimetric and electrochemical experiments (potentiodynamic polarization and Electrochemical impedance spectroscopy), surface analytical techniques (scanning electron microscopy (SEM)/energy dispersive X-ray spectroscopy (EDAX) and atomic force microscopy (AFM)) and theoretical study. The investigated compounds exhibited surface active properties and performed as good inhibitors for corrosion control of mild steel (MS) in acid solution. However, compared to monomeric (C12Cys), Gemini surfactant 2(C12Cys) showed high corrosion inhibiting ability at very low concentration. The EIS results revealed a greater charge transfer resistance in 2(C12Cys) solution compared to that in (C12Cys) solution. SEM/EDAX observations validate the development of an inhibitive film by the adsorbed molecules of surfactant on the MS surface. The AFM micrographs supported the SEM/EDAX results and exhibited a lowering in the roughness of the corroded MS surface in the presence of both (C12Cys) and 2(C12Cys) surfactants. Further, quantum chemical calculations and Monte Carlo simulations were used to study the dependence of corrosion inhibiting efficacy on the molecular structure and adsorption strength.

中文翻译:

NN'-二烷基胱氨酸双子叶和单体N-烷基半胱氨酸表面活性剂在1M HCl溶液中对轻钢腐蚀的缓蚀作用:对比研究

合成并纯化了衍生自胱氨酸的双子表面活性剂NN'-二烷基胱氨酸2(C 12 Cys)和单体N-烷基半胱氨酸对应物(C 12 Cys)。表面活性剂2(C 12 Cys)和(C 12 Cys)的表征通过傅立叶变换红外光谱,1 H NMR和元素分析进行​​。2(C 12 Cys)和(C 12通过重量分析和电化学实验(电位动力学极化和电化学阻抗谱),表面分析技术(扫描电子显微镜(SEM)),研究了在1 M HCl溶液中对低碳钢(MS)腐蚀的Cys)随浓度和电解质温度的变化。 )/能量色散X射线光谱法(EDAX)和原子力显微镜(AFM))和理论研究。所研究的化合物具有表面活性,在控制酸性溶液中低碳钢(MS)腐蚀方面表现出良好的抑制剂作用。然而,与单体(C 12 Cys)相比,双子表面活性剂2(C 12 Cys)在非常低的浓度下显示出高的缓蚀能力。EIS结果显示2(C12 Cys)溶液与(C 12 Cys)溶液相比。SEM / EDAX观察证实了MS表面上吸附的表面活性剂分子形成的抑制膜。AFM显微照片支持SEM / EDAX结果,并且在同时存在(C 12 Cys)和2(C 12 Cys)表面活性剂的情况下,腐蚀的MS表面的粗糙度降低。此外,利用量子化学计算和蒙特卡洛模拟研究了缓蚀效果对分子结构和吸附强度的依赖性。
更新日期:2017-09-11
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