Adsorption and Corrosion Inhibition Performance by Three New Ionic Liquids on API 5L X52 Steel Surface in Acid Media

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• 作者：Octavio Olivares-Xometl ; Claudia L贸pez-Aguilar ; Pilar Herrast铆-Gonz谩lez ; Natalya V. Likhanova ; Irina Lijanova ; Rafael Mart铆nez-Palou ; J. Antonio Rivera-M谩rquez
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：June 11, 2014
• 年：2014
• 卷：53
• 期：23
• 页码：9534-9543
• 全文大小：543K
• 年卷期：v.53,no.23(June 11, 2014)
• ISSN：1520-5045

文摘

In the present work, three new ionic liquids (ILs) were tested as corrosion inhibitors (CIs): 1,2-dimethyl-3-decylimidazole iodide (DDI), N-triethyl methylammonium acetate (TMA) and N-triethyl methylammonium laurate (TML). The tests were carried out in 1.0 M solutions of sulfuric acid (H₂SO₄) and hydrochloric acid (HCL) in order to inhibit the corrosion of API 5L X-52 steel. The corrosion inhibitors (CIs) were evaluated by Tafel polarization and polarization resistance (R_P). The Tafel polarization results confirmed that DDI, TMA, and TML inhibited the steel corrosion and worked as mixed inhibitors in both corrosive media. In 1.0 M H₂SO₄, DDI featured the best inhibition efficiency (IE), which ranged from 57 to 95%, whereas TMA in 1.0 M HCl showed the best IE, which was within the 30鈥?0% range. The IE obtained by R_P in 1.0 M H₂SO₄ was increased as a function of time, while in 1.0 M HCl, it was inversely proportional. The adsorption displayed by DDI, TMA, and TML on the API 5L X52 steel surface was both physical and chemical, which was obtained from different adsorption isotherms.