Journal
ELECTROCHIMICA ACTA
Volume 54, Issue 6, Pages 1881-1887Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2008.10.025
Keywords
Steel; Corrosion; Electrochemical measurement; Ionic liquids; Adsorption
Categories
Funding
- National Natural Science Foundation of China [50564006]
- Natural Science Foundation of Yunnan Province [2005E0004Z]
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The acid corrosion inhibition process of mild steel in 1M HCl by 1-butyl-3-methylimidazolium chlorides (BMIC) and 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM]HSO4) has been investigated using electrochemical impedance, potentiodynamic polarization and weight loss measurements. Potentiodynamic polarization studies indicate the studied inhibitors are mixed type inhibitors. For both inhibitors, the inhibition efficiency increased with increase in the concentration of the inhibitor and the effectiveness of the two inhibitors are in the order [BMIM]HSO4 > BMIC. The adsorption of the inhibitors on mild steel surface obeyed the Langmuir's adsorption isotherm. The effect of temperature on the corrosion behavior in the presence of 5 x 10(-3) M of inhibitors was studied in the temperature range of 303-333 K. The associated activation energy of corrosion and other thermodynamic parameters such as enthalpy of activation (Delta H), entropy of activation (Delta S). adsorption equilibrium constant (K-ads) and standard free energy of adsorption (Delta G(ads)) were calculated to elaborate the mechanism of corrosion inhibition. Crown Copyright (C) 2008 Published by Elsevier Ltd. All rights reserved.
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