Synergistic effect of mixed cationic and anionic surfactants on the corrosion inhibitor behavior of mild steel in 3.5% NaCl

Soheila Javadian; Ali Yousefi; Jaber Neshati

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Synergistic effect of mixed cationic and anionic surfactants on the corrosion inhibitor behavior of mild steel in 3.5% NaCl

机译：阳离子和阴离子表面活性剂混合对3.5％NaCl中低碳钢缓蚀性能的协同作用

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摘要

The corrosion inhibition characteristics of cation-rich and anion-rich catanionic mixtures of cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SDS), as corrosion inhibitor of mild steel (MS), in aqueous solution of 3.5% NaCl were investigated using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and scanning electron microscopy (SEM). Solutions of CTAB/SDS mixtures showed more appropriate inhibition properties compared to the solutions of the individual surfactants, due to strong adsorption on the metal surface and formation of a protective film. Potentiodynamic polarization investigations indicated that the inhibitors studied were mixed type inhibitors. Adsorption of the inhibitors on the mild steel surface obeyed the Flory-Huggins adsorption isotherm. Furthermore, the values of the adsorption free energy (△G°_(ads)) in both mixtures decreased compared with a single surfactant which is attributed to stronger interactions in mixtures.

机译：研究了十六烷基三甲基溴化铵（CTAB）和十二烷基硫酸钠（SDS）作为低碳钢（MS）的缓蚀剂的富阳离子和富阴离子阳离子混合物在3.5％NaCl水溶液中的腐蚀抑制特性阻抗光谱（EIS），电位动力学极化和扫描电子显微镜（SEM）。与单个表面活性剂的溶液相比，CTAB / SDS混合物的溶液显示出更合适的抑制性能，这是由于在金属表面上的强烈吸附和保护膜的形成。电位动力极化研究表明所研究的抑制剂是混合型抑制剂。缓蚀剂在低碳钢表面上的吸附遵循Flory-Huggins的吸附等温线。此外，与单一表面活性剂相比，两种混合物中的吸附自由能值（△G°_（ads））均降低，这归因于混合物中更强的相互作用。

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来源
《Applied Surface Science》 |2013年第ptab期|674-681|共8页
作者
Soheila Javadian; Ali Yousefi; Jaber Neshati;
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作者单位

Department of Chemistry, Faculty of Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran;

Department of Chemistry, Faculty of Science, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran;

Corrosion Department, Coating Research Center, Research Institute of Petroleum Industry (RIPI), P.O. Box 18745-4163, Tehran, Iran;

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原文格式 PDF
正文语种 eng
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关键词
Corrosion; Inhibition; Surfactant; Adsorption isotherm;

机译：腐蚀;抑制剂;表面活性剂;吸附等温线;

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Synergistic effect of mixed cationic and anionic surfactants on the corrosion inhibitor behavior of mild steel in 3.5% NaCl

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