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N ‐methyl‐2‐hydroxyethylammonium oleate ionic liquid performance as corrosion inhibitor for mild steel in hydrochloric acid medium
Author(s) -
Schmitzhaus Tobias E.,
Ortega Vega Maria R.,
Schroeder Roberto,
Muller Iduvirges L.,
Mattedi Silvana,
Malfatti Célia de Fraga
Publication year - 2020
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.202011709
Subject(s) - hydrochloric acid , chloride , adsorption , ionic liquid , corrosion , corrosion inhibitor , electrochemistry , chemistry , cathodic protection , ionic bonding , scanning electron microscope , inorganic chemistry , oleic acid , nuclear chemistry , materials science , electrode , organic chemistry , catalysis , ion , biochemistry , composite material
The aim of the present study is to evaluate the performance of N ‐methyl‐2‐hydroxyethylammonium oleate ([m‐2HEA][Ol]) as a corrosion inhibitor for mild steel in a 0.1‐mol/L hydrochloric acid solution and also investigate the role of chloride in the inhibition mechanism. This protic ionic liquid (PIL) has formerly shown a high efficiency as a corrosion inhibitor in a neutral chloride medium. Electrochemical and weight loss measurements, surface contact angle determination, scanning electron microscopy, and Raman spectroscopy were used to understand the factors that influence the response of the studied inhibitor. Results revealed that [m‐2HEA][Ol] behaves as a mixed‐type adsorption inhibitor, by blocking cathodic sites and by modifying the activation energy of the anodic reaction, and it can reach up to 94–97% of inhibition efficiency. PIL adsorption was enhanced by the excess of positive charge of the mild steel. The effect of inhibitor molecule has been discussed to propose a mechanism that explains the inhibitory action of the corrosion inhibitor, pointing out the role of chloride in the inhibition mechanism.