Solomon Moses M, Umoren Saviour A, Quraishi Mumtaz A, Salman Mohammad
Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
Center of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
J Colloid Interface Sci. 2019 Sep 1;551:47-60. doi: 10.1016/j.jcis.2019.05.004. Epub 2019 May 2.
There is a high demand of effective and eco-friendly corrosion inhibitor for industrial applications. In an attempt to prepare a benign and effective corrosion inhibitor for acidizing purpose, an imidazoline derivative, N-(2-(2-tridecyl-4,5-dihydro-1H-imidazol-1-yl)ethyl)tetradecanamide (NTETD) was synthesized from myristic acid and diethyleneamine. The characterization of the newly synthesized compound was done using H NMR, FTIR, and elemental analysis techniques. NTETD was examined as a corrosion inhibitor for low carbon steel in 15% HCl solution using weight loss, electrochemical impedance spectroscopy (EIS), potentiodynamic polarization (PDP), linear polarization (LPR), scanning electron microscope (SEM), energy dispersive spectroscopy (EDAX), atomic force spectroscopy (AFM), and X-ray photoelectron spectroscopy (XPS) techniques. It was found that, the optimum concentration of NTETD is 300 mg/L. With this concentration, inhibition efficiency above 93% is achievable. Results from PDP show that, NTETD acted as a mixed type corrosion inhibitor but with principal effect on cathodic corrosion half reactions. The calculated value of the adsorption-desorption equilibrium constant (1.015 × 10) reveals a strong bonding between NTETD molecules and the steel surface. The EDAX, FTIR, and XPS results confirm the adsorption of NTETD molecules on the steel surface. SEM and AFM results agree with experimental findings that NTETD is effective in corrosion mitigation of steel in 15% HCl solution. The possible corrosion inhibition mechanism by NTETD has been proposed.
工业应用对高效且环保的缓蚀剂有很高的需求。为了制备一种用于酸化目的的良性且有效的缓蚀剂，由肉豆蔻酸和二亚乙基胺合成了一种咪唑啉衍生物，即N-(2-(2-十三烷基-4,5-二氢-1H-咪唑-1-基)乙基)十四烷酰胺(NTETD)。使用核磁共振氢谱(H NMR)、傅里叶变换红外光谱(FTIR)和元素分析技术对新合成的化合物进行了表征。采用失重法、电化学阻抗谱(EIS)、动电位极化(PDP)、线性极化(LPR)、扫描电子显微镜(SEM)、能量色散光谱(EDAX)、原子力光谱(AFM)和X射线光电子能谱(XPS)技术研究了NTETD作为低碳钢在15%盐酸溶液中的缓蚀剂。结果发现，NTETD的最佳浓度为300mg/L。在此浓度下，缓蚀效率可达到93%以上。PDP结果表明，NTETD作为混合型缓蚀剂，但对阴极腐蚀半反应起主要作用。计算得到的吸附-解吸平衡常数(1.015×10)表明NTETD分子与钢表面之间有很强的结合力。EDAX、FTIR和XPS结果证实了NTETD分子在钢表面的吸附。SEM和AFM结果与实验结果一致，即NTETD对15%盐酸溶液中的钢具有有效的缓蚀作用。提出了NTETD可能的缓蚀机理。
