Electrochemical Impedance Spectroscopy (EIS) Study of the Film Formation of 2-imidazoline Derivatives on Carbon Steel in Acid Solution
Keywords:corrosion inhibition, imidazoline, electrochemical impedance spectroscopy (EIS).
In this work, EIS has been used to study the film formation of 2-methyl-2-imidazoline (MI), and N-methyl-2-methyl-2-
imidazoline (MMI) on carbon steel 1018 in hydrochloric acid 0.5 M. EIS experiments were recorded at 0, 100, 200, 300,
400, and 500 min at 1, 5 and 12.5 mM. EIS data were used to calculate corrosion related electrochemical parameters,
and this technique was shown to be a very useful tool for studying corrosion inhibitors. The results showed an
increment in the charge transfer resistant values (Rct), and a decrease in the double layer electrochemical capacitance
values (Cdl) when concentration of the imidazoline compound is increasing, suggesting that the pendant group
significantly affects the electrochemical behavior of 2-imidazoline derivatives against corrosion.
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