Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution


Journal: Vol.8, No.4, autumn 2015 - Article 3   Pages :  283 Until 294



Article Code:
PCCC-2015-06-21-291

Authors:
M. Mahdavian: Institute for Color Science and Technology - Department of Surface Coating and Corrosion
M. M. Attar: Amirkabir University of Technology - Department of Polymer Engineering and Color Technology
Farahnaz Shiran: Valoriza Water Australia - Laboratory


Article's abstract:

Adsorption of benzimidazole, 2-methylbenzimidazole and 2-aminobenzimidazole on mild steel in 3.5 NaCl solution was studied using density function theory DFT calculations. In this regard, charge transfer resistance Rct and double layer capacitance Cdl obtained by electrochemical impedance spectroscopy EIS were used to calculate surface coverage and to build prediction models. When prediction models were only based on quantum chemical parameters of imidazoles, the most effective parameters were frontier orbital energies meaning that dominant mechanism of adsorption was chemisorption. However, models based on imidazoles and iron quantum chemical parameters revealed that the most effective parameter is dipole moment meaning that dominant mechanism of adsorption is physisorption. Prediction models based on inhibitor-FeOH2H2O4 and inhibitor-FeOH3H2O3 systems presented dipole moment and electron donating power as the most effective parameters for θR and θC based calculations, respectively. Such a behavior could be attributed to chemical interaction of inhibitors with FeOH2H2O4 and FeOH3H2O3 on the mild steel surface resulting in a porous thick layer which could not effectively block the surface but could decrease double layer capacitance.


Keywords:
Adsorption; EIS; Corrosion Inhibitor; Corrosion Product; Quantum Chemistry

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