Task-specific ionic liquids as corrosion inhibitors on carbon steel in 0.5 M HCl solution: An experimental and theoretical study

By S. Cao, Dan Liu, Hui Ding, Jinghui Wang, Hui Lu, J. Gui. Corrosion Science, 2019

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Abstract This study investigated corrosion inhibition of task-specific ionic liquids, 1-(4-sulfonic acid) butyl-3-ethyl imidazolium hydrogen sulfate and 1-(4-sulfonic acid) butyl-3-decyl imidazolium hydrogen sulfate, for carbon steel in 0.5 M HCl by electrochemical tests, SEM, UV–vis, XPS, contact angle measurements, molecular orbital theory, and MD simulations. The inhibition efficiency of both ionic liquids increased with concentration, and the latter one shows higher inhibition efficiency of 97.9% due to the weaker hydrophilicity caused by increased alkyl tail. The mechanism of inhibition was found to be through adsorption onto the steel surface with cycling donation and back-donation of electrons.

Subfields: Catalysis, Civil and Structural Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/e5c5e1d3ec056df458d5f90ce57e8c84e472b073