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.
Mahdavian, M. , Attar, M. M. and Shiran, F. (2015). Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution. Progress in Color, Colorants and Coatings, 8(4), 283-294. doi: 10.30509/pccc.2015.75866
MLA
Mahdavian, M. , , Attar, M. M. , and Shiran, F. . "Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution", Progress in Color, Colorants and Coatings, 8, 4, 2015, 283-294. doi: 10.30509/pccc.2015.75866
HARVARD
Mahdavian, M., Attar, M. M., Shiran, F. (2015). 'Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution', Progress in Color, Colorants and Coatings, 8(4), pp. 283-294. doi: 10.30509/pccc.2015.75866
CHICAGO
M. Mahdavian , M. M. Attar and F. Shiran, "Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution," Progress in Color, Colorants and Coatings, 8 4 (2015): 283-294, doi: 10.30509/pccc.2015.75866
VANCOUVER
Mahdavian, M., Attar, M. M., Shiran, F. Quantum chemical studies on adsorption of imidazole derivatives as corrosion inhibitors for mild steel in 3.5 NaCl solution. Progress in Color, Colorants and Coatings, 2015; 8(4): 283-294. doi: 10.30509/pccc.2015.75866
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