Investigation of the effect of penicillin G as environment-friendly corrosion inhibitor for mild steel in H3PO4 solution

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Fatemeh Soltaninejad: Islamic Azad University, Kerman Branch - Chemistry Dept.
M. Shahidi: Islamic Azad University, Kerman Branch - Department of Chemistry

Article's abstract:

The corrosion behavior of mild steel Ck 45 in 3.0 M H3PO4 solution in the absence and presence of penicillin G was studied using potentiodynamic polarization and electrochemical impedance spectroscopy EIS techniques. The best inhibition effect at 10 mM drug was a marked characteristic of the inhibitor.It was found that the inhibition efficiency of the inhibitor depends on its concentration and chemical structure and it means that with increasing the concentration the values of inhibition efficiency also increase. The adsorption process obeyed Langmuir adsorption isotherm. Some thermodynamic parameters were determined from the effect of temperature on corrosion and inhibition processes. Potentiodynamic polarization measurements indicated that the drug was a mixed type inhibitor.

Penicillin G; Environment-friendly inhibitor; Electrochemical impedance spectroscopy; Potentiodynamic polarization.

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