低碳钢在硫酸溶液中的高效水溶性表面活性剂的合成、表征和腐蚀防护潜力

IF 1.6 4区 工程技术 Q3 CHEMISTRY, APPLIED Journal of Surfactants and Detergents Pub Date : 2024-01-28 DOI:10.1002/jsde.12737
Ibrahim Y. Yaagoob, Lipiar K. M. O. Goni, Mohammad A. J. Mazumder, Chandrabhan Verma, Shaikh A. Ali, Akram Alfantazi
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引用次数: 0

摘要

本研究合成并表征了一种四阳离子季铵盐 (TCQAC),并考察了它在 0.5 M H2SO4 溶液中抑制低碳钢 (MS) 腐蚀的能力。研究采用了各种化学、电化学和表面表征技术来研究 TCQAC 的抑制效率。在 20ppm 浓度下,TCQAC 的抑制效率为 99.83%。在所有研究过的等温线模型中,Langmuir 等温线最适合 TCQAC 在 MS 表面的吸附。ΔGads(-45.18 kJ mol-1)的负值非常高,表明 TCQAC 的吸附遵循化学吸附机制。电化学研究表明,TCQAC 会增加线性电阻和电荷转移电阻(分别为 LPR 和 Rct)。TCQAC 会减缓阳极和阴极 Tafel 反应;但是,在 5、10 和 20 ppm 的浓度下,TCQAC 会起到阳极型抑制剂的作用。能量色散 X 射线(EDX)光谱中出现了额外的 Cl 和 N 信号,扫描电子显微镜(SEM)图像中被抑制样品的表面光滑度也得到了改善,这些都证实了吸附抑制腐蚀的方法。X 射线光电子能谱(XPS)研究表明,TCQAC 通过化学吸附产生了防腐蚀层。在前沿分子轨道(FMOs)中,最高占位分子轨道(HOMO)和最低未占位分子轨道(LUMO)围绕着由两个苄基、四个烯丙基和一个烃((CH2)6) 分子和两个季氮原子组成的中心部分而分散。XPS 和密度泛函理论(DFT)分析结果表明,TCQAC 通过与表面铁原子的 dπ-pπ 键发生化学吸附。芳基和烯丙基的 π 电子广泛参与了成键过程。
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Synthesis, characterization, and corrosion protection potential of a highly effective and water-miscible surfactant for mild steel in sulfuric acid solution

In the current study, a tetracationic quaternary ammonium salt (TCQAC) was synthesized and characterized and its ability to suppress corrosion on mild steel (MS) in a 0.5 M H2SO4 solution was examined. Various chemical, electrochemical, and surface characterization techniques were utilized to study the inhibition efficiency of TCQAC. The TCQAC manifests 99.83% efficiency at 20 ppm concentration. Out of all the examined isotherm models, the Langmuir isotherm offered the best fit for the TCQAC adsorption on the MS surface. A very high negative value of ΔGads (−45.18 kJ mol−1) suggests that the adsorption of TCQAC followed the chemisorption mechanism. Electrochemical studies indicate that TCQAC increases the linear and charge transfer resistances (LPR and Rct, respectively). TCQAC slows down the anodic and cathodic Tafel reactions; however, it acts as an anodic-type inhibitor at 5, 10, and 20 ppm. The appearance of extra Cl and N signals in the energy dispersive x-ray (EDX) spectrum and an improvement in surface smoothness in the scanning electron microscope (SEM) image of the inhibited sample corroborated the adsorption method of corrosion inhibition. X-ray photoelectron spectroscopy (XPS) study indicates that TCQAC creates corrosion preventive layers by chemical adsorption. In Frontier molecular orbitals (FMOs), highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) were delocalized around the central part that comprises two benzyls, four allyls, and one hydrocarbon ((CH2)6) moieties and two quaternary nitrogen atoms. The outcomes of XPS and density functional theory (DFT) analyses indicate that the chemisorption of TCQAC occurs by dπ–pπ bonding with the surface iron atoms. The π-electrons of aryl and allyl moieties extensively participate in the bonding.

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来源期刊
Journal of Surfactants and Detergents
Journal of Surfactants and Detergents 工程技术-工程:化工
CiteScore
3.80
自引率
6.20%
发文量
68
审稿时长
4 months
期刊介绍: Journal of Surfactants and Detergents, a journal of the American Oil Chemists’ Society (AOCS) publishes scientific contributions in the surfactants and detergents area. This includes the basic and applied science of petrochemical and oleochemical surfactants, the development and performance of surfactants in all applications, as well as the development and manufacture of detergent ingredients and their formulation into finished products.
期刊最新文献
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