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

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    Date
    2015
    Author
    Mashuga, Motsie Elija
    Olasunkanmi, Lukman Olawale
    Adekunle, Abolanle
    Yesudass, Sasikumar
    Kabanda, Mwombeki Mwadham
    Ebenso, Eno Effiong
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    Abstract
    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.
    URI
    http://hdl.handle.net/10394/19366
    https://doi.org/10.3390/ma8063607
    https://www.mdpi.com/1996-1944/8/6/3607/pdf
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    • Faculty of Natural and Agricultural Sciences [4855]

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