Abstract
Inhibition of mild steel corrosion in 1 M HCl solution by Pheniramine drug was studied using weight loss, electrochemical impedance spectroscopy, linear polarization resistance, and potentiodynamic polarization measurements. The values of activation energy ( E a) and different thermodynamic parameters such as adsorption equilibrium constant ( K ads), free energy of adsorption ( Δ G ads ° ) , adsorption enthalpy ( Δ H ads ° ) and adsorption entropy ( Δ S ads ° ) were calculated and discussed. The adsorption process of studied drug on mild steel surface obeys the Langmuir adsorption isotherm. Potentiodynamic polarization measurements showed that Pheniramine is mixed-type inhibitor. Further, theoretical calculations were carried out and relations between computed parameters and experimental inhibition efficiency were discussed.
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