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首页> 外文期刊>Journal of Molecular Liquids >Study of corrosion behavior of API 5L X52 steel in sulfuric acid in the presence of ionic liquid 1-ethyl 3-methylimidazolium thiocyanate as corrosion inhibitor
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Study of corrosion behavior of API 5L X52 steel in sulfuric acid in the presence of ionic liquid 1-ethyl 3-methylimidazolium thiocyanate as corrosion inhibitor

机译：将API 5L X52钢在硫酸中存在硫酸在离子液体1-乙基3-甲基咪唑鎓硫氰酸盐作为腐蚀抑制剂的情况下的腐蚀性研究

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摘要

The inhibition effect of ionic liquid (IL) 1-ethyl-3- methylimidazolium thiocyanate (EMIM)(+) (SCN)(-) on the corrosion of API 5L X52 steel in 0.5 M H2SO4 solution at different temperatures were studied, using gravimetrical, electrochemical, spectroscopic and simulation methods. The highest efficiency and the optimal concentrations were 90.1% and 75 ppm of the IL respectively. Scanning electron microscopy characterization reveals less surface damage in the corroded samples confirming the effectiveness of the IL, while X-ray photoelectron spectroscopy analysis evidenced the formation of an interfacial protective layer, composed by the inhibitor molecules and corrosion products. Polarization measurements showed that the IL is a mixed-type inhibitor, retarding the dissolution of mild steel and hydrogen evolution reactions, enhancing its efficiency as a function of its concentration; besides a minor influence of the temperature in the inhibition efficiency is recorded by weight loss, potentiodynamic polarization, and electrochemical impedance spectroscopy techniques. A competitive chemisorption process is observed on steel obeying a Langmuir isotherm. Ultraviolet-visible spectroscopy confirmed chemical interaction between IL and metal surface. The density functional theory and molecular dynamic (MD) simulation were used to correlate with the experimental results and determine the adsorption energy of the inhibitor in different substrate's crystallographic planes. Furthermore, from the results of the interaction between the inhibitor molecules in the presence of water on the steel surface using MD on seven most compact planes of BCC system, it was capable of establishing a correlation between adsorption energies of the inhibitor and the crystallographic texture and the surface roughness of the studied steel. (C) 2019 Elsevier B.V. All rights reserved.
机译：研究了离子液体（IL）1-乙基-3-甲基咪唑硫代氰酸酯（eMIM）（+）（ - ）对不同温度下0.5M H 2 SO 4溶液在0.5M H 2 SO 4溶液中的腐蚀的抑制作用。 ，电化学，光谱和仿真方法。最高效率和最佳浓度分别为90.1％和75ppm的IL。扫描电子显微镜表征揭示了确认IL的有效性的腐蚀样品中的表面损伤的较小，而X射线光电子能谱分析证明了由抑制剂分子和腐蚀产物组成的界面保护层的形成。偏振测量表明，IL是混合型抑制剂，延迟了低碳钢和氢气进化反应的溶解，提高了其浓度的效率;除了在抑制效率中的温度的微小影响之外，通过减肥，电位动力学极化和电化学阻抗光谱技术记录。在服从朗米尔等温线的钢铁中观察到竞争的化学吸取过程。紫外线可见光谱证实了IL和金属表面之间的化学相互作用。密度函数理论和分子动态（MD）模拟用于与实验结果相关，并确定不同底物晶粒中抑制剂的吸附能。此外，通过在钢表面上的水在钢表面上的七个最小的BCC系统中存在抑制剂分子之间的相互作用的结果，它能够建立抑制剂的吸附能量与晶体纹理之间的相关性学习钢的表面粗糙度。 （c）2019 Elsevier B.v.保留所有权利。

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