Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 265, Issue -, Pages 151-163Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2018.04.153
Keywords
Corrosion inhibitor; Ammonium-based ionic liquids; Steel; Corrosion inhibition mechanism
Funding
- CONACYT-Mexico
- BUAP-VIEP [CA-255]
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Methyltrioctylammonium methyl sulfate (TMA) and trimethyltetradecylammonium methyl sulfate (TTA) were synthetized as novel quaternary-ammonium-derived ionic liquids (ILs) in order to be evaluated as corrosion inhibitors (CIs) of API-X52 steel in 1 M HCl. Electrochemical techniques were used to evaluate the anticorrosive effect, finding that TMA and TTA worked as mixed-type CIs and inhibited the corrosion process depending on the temperature, immersion time and IL concentration, being remarkably effective at 40 degrees C, which was attributed to the high thermal stability of the methyl sulfate anions. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM) were used to elicit the chemical composition and surface morphology of steel in the presence of CIs whose adsorption processes involved strong electrostatic interactions between the metal, chloride ions, methyl sulfate anions and quaternary ammonium cations in the ILs. The results allowed the development of a corrosion inhibition mechanism. (C) 2018 Elsevier B.V. All rights reserved.
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