Corrosion Inhibition of Carbon Steel in Acidic Environment by Imidazolium Ionic Liquids Containing Vinyl-Hexafluorophosphate as Anion

Five imidazolium-type ionic liquids, containing both N1-unsatured chain and N3-long alkyl saturated chain as cations and hexafluorophosphate as anion (VImCxPF6, x=4, 8, 12, 18 and 22), were evaluated as corrosion inhibitors for carbon steel SAE 1018 in 1.0 M H2SO4 solution. The compounds presented r...

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Bibliographic Details
Published in:International journal of electrochemical science 2011-10, Vol.6 (10), p.4514-4536
Main Authors: Likhanova, Natalya V., Olivares-Xomet, Octavio, Guzmán-Lucero, Diego, Domínguez-Aguilar, Marco A., Nava, Noel, Corrales-Luna, Mónica, Mendoza, M. Consuelo
Format: Article
Language:English
Subjects:
acidic medium
carbon steel
hexfluorophosphate
inhibitor efficiency
ionic liquid
Mössbauer spectroscopy
vinylimidazolium
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Summary:Five imidazolium-type ionic liquids, containing both N1-unsatured chain and N3-long alkyl saturated chain as cations and hexafluorophosphate as anion (VImCxPF6, x=4, 8, 12, 18 and 22), were evaluated as corrosion inhibitors for carbon steel SAE 1018 in 1.0 M H2SO4 solution. The compounds presented relatively high inhibition efficiencies (~81-96%) at 100 ppm as confirmed by weight loss tests and polarization curves. Synthesized inhibitors obeyed Langmuir adsorption and behaved as mixed type inhibitors, displaying physical and chemical adsorption depending on the length of the carbon chain link to N3. Mössbauer analysis of corrosion products mainly determined the presence szomolnokite (FeSO4 H2O), whose content increased with aliphatic chain length suggesting that corrosion inhibition occurred by iron sulfate formation. The most effective compound (VImC12/PF6) was the only that displayed the presence of alpha iron, iron hydroxide and rozenite (FeSO4 4H2O) as corrosion products.
ISSN:1452-3981
1452-3981
DOI:10.1016/S1452-3981(23)18346-5