The effect of two oleo-gum resin exudate from Ferula assa-foetida and Dorema ammoniacum on mild steel corrosion in acidic media |
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Authors: | M. Behpour S.M. Ghoreishi M. Khayatkashani N. Soltani |
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Affiliation: | aDepartment of Analytical Chemistry, Faculty of Chemistry, University of Kashan, Kashan 87317-51167, Islamic Republic of Iran;bDepartment of Chemistry, Payame Noor University (PNU), Tehran 19395-4697, Islamic Republic of Iran |
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Abstract: | A comparative study of two oleo-gum resins exudate from Ferula assa-foetida (F. assa-foetida) and Dorema ammoniacum (D. ammoniacum), as inhibitors for mild steel corrosion in 2 M HCl solution was investigated by weight loss measurements, potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. Potentiodynamic polarization curves indicated that both oleo-gums behave as mixed type inhibitors. The effect of temperature on the inhibition efficiency was studied. At all temperatures, the experimental data fit Langmuir isotherm for both oleo-gum resin exudates. Quantum chemical calculations were performed to illustrate the adsorption process of some specific components of two oleo-gum resin exudates. |
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Keywords: | A. Mild steel A. Acid solutions B. Polarization B. EIS C. Acid inhibition |
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