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Electrochemistry and XPS study of an imidazoline as corrosion inhibitor of mild steel in an acidic environment
Author(s) -
OlivaresXometl O.,
Likhanova N. V.,
MartínezPalou R.,
DomínguezAguilar M. A.
Publication year - 2009
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.200805044
Subject(s) - imidazoline receptor , x ray photoelectron spectroscopy , corrosion inhibitor , dielectric spectroscopy , carbon steel , corrosion , chemistry , hydrochloric acid , electrochemistry , adsorption , polarization (electrochemistry) , steric effects , ethylamine , inorganic chemistry , nuclear chemistry , stereochemistry , organic chemistry , electrode , chemical engineering , medicine , engineering
The effect of 2‐(2‐heptadec‐8‐enyl‐4,5‐dihydro‐imidazol‐1‐yl)‐ethylamine on the corrosion behavior of mild steel in aqueous hydrochloric acid was investigated using weight loss measurements, polarization scans, electrochemical impedance, and X‐ray photoelectron spectroscopy (XPS). The inhibition efficiencies and coverage degrees increased with the concentration of inhibitor but decreased proportionally with temperature. It appears that the steric hindrance of the aliphatic chain on the imidazoline ring adsorption may affect inhibitor efficiency. Polarization curves showed that the oleic imidazoline (OI) acted essentially as a mixed type inhibitor, in which the blocking of active sites occurred. As a result of film formation, impedance spectra revealed a considerable increase in the charge transfer resistance as indicated by the second capacitive loop. XPS depth profile analysis observed the presence of nitrogen and carbon species on the inhibitor film, which were associated to the OI.