Journal
JOURNAL OF MOLECULAR LIQUIDS
Volume 336, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.molliq.2021.116320
Keywords
Mild steel; Ionic liquid; Corrosion inhibitor; Tafel slope; Noise resistance; Spectral noise resistance
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The research demonstrates the excellent corrosion inhibition capability of DMIBr2 in hydrochloric acid, which eliminates electrochemical noise signals, mitigates steel corrosion, and presents as a mixed-type corrosion inhibitor. The Langmuir adsorption isotherm is used to explain its adsorption behavior on steel surface.
The corrosion prevention capability of an imidazole-based benzilic-dicationic ionic liquid labeled 1,4 -di [1' -methylene- 3'- methyl imidazolium bromide]- benzene (DMIBr2) over mild steel in hydrochloric acid was investigated through experimental and theoretical studies. The excellent corrosion inhibitor ability of DMIBr2 was demonstrated using a new concept in noise resistance and spectral noise resistance interrelation to adequately eliminate the trend of electrochemical noise (EN) signals, which is in line with electrochemical impedance spectroscopy findings. EN also revealed that DMIBr2 mitigated both localized and general mild steel corrosion, as evidenced by SEM analysis. Potentiodynamic polarization suggested DMIBr2 can be described as a mixed-type corrosion inhibitor with cathodic control predominance in 1.0 M HCl. Langmuir adsorption isotherm was considered to interpret the DMIBr2 adsorption behavior on mild steel. Furthermore, according to quantum chemical calculations, the probable protonation process in the acid can affect the functionalities of different DMIBr2 components. (C) 2021 Elsevier B.V. All rights reserved.
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