Adsorption, Thermodynamic and Quantum Chemical Studies of 1-hexyl-3-methylimidazolium Based Ionic Liquids as Corrosion Inhibitors for Mild Steel in HCl

被引：82
作者：
Mashuga, Motsie E. [1 ,2 ]
Olasunkanmi, Lukman O. [1 ,2 ,3 ]
Adekunle, Abolanle S. [1 ,2 ,3 ]
Yesudass, Sasikumar [1 ]
Kabanda, Mwadham M. [1 ,2 ]
Ebenso, Eno E. [1 ,2 ]
机构：
[1] North West Univ, Sch Math & Phys Sci, Dept Chem, Fac Agr, ZA-2735 Mmabatho, South Africa
[2] North West Univ, Mat Sci Innovat & Modelling MaSIM Res Focus Area, Fac Agr Sci & Technol, ZA-2735 Mmabatho, South Africa
[3] Obafemi Awolowo Univ, Dept Chem, Fac Sci, Ife 220005, Nigeria
来源：
MATERIALS | 2015年 / 8卷 / 06期
关键词：
corrosion inhibition; mild steel; ionic liquid; adsorption; quantum chemical calculations; CARBON-STEEL; SCHIFF-BASE; ACID; IMIDAZOLIUM; BEHAVIOR; SURFACE; GREEN; PERFORMANCE; ALUMINUM; IRON;
D O I：
10.3390/ma8063607
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The inhibition of mild steel corrosion in 1 M HCl solution by some ionic liquids (ILs) namely, 1-hexyl-3-methylimidazolium trifluoromethanesulfonate [HMIM][TfO], 1-hexyl-3-methylimidazolium tetrafluoroborate [HMIM][BF4], 1-hexyl-3-methylimidazolium hexafluorophosphate [HMIM][PF6], and 1-hexyl-3-methylimidazolium iodide [HMIM][I] was investigated using electrochemical measurements, spectroscopic analyses and quantum chemical calculations. All the ILs showed appreciably high inhibition efficiency. At 303 K, the results of electrochemical measurements indicated that the studied ILs are mixed-type inhibitors. The adsorption studies showed that all the four ILs adsorb spontaneously on steel surface with [HMIM][TfO], [HMIM][BF4] and [HMIM][I] obeying Langmuir adsorption isotherm, while [HMIM][PF6] conformed better with Temkin adsorption isotherm. Spectroscopic analyses suggested the formation of Fe/ILs complexes. Some quantum chemical parameters were calculated to corroborate experimental results.
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页码：3607 / 3632
页数：26
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