Investigation of the Inhibition of Carbon Steel Corrosion in Hydrochloric Acid Solutions by Domperidone Drug

Abstract

The influence of Domperidone on the inhibition of carbon steel (CS) corrosion in 1M HCl solutions was studied using weight loss (WL), (EIS) electrochemical impedance spectroscopy, electrochemical frequency modulation (EFM) and potentiodynamic polarization (PP) techniques, as well as thermodynamic calculations to explore the adsorption mechanism of Domperidone. The inhibition efficiency (IE %) was found to increase with increasing the dose of the Domperidone and with decreasing temperature. The maximum IE% of 94.9 % was obtained in presence of 1.12x10 -4M. The inhibition action of Domperidone was explained in terms of adsorption on CS surface. The adsorption process follows Langmuir isotherm and kinetic-thermodynamic model. Thermodynamic and kinetic parameters were calculated and discussed. Polarization tests showed that this drug is of mixed type. Corrosion protection properties of the drug have been inferred from FT-IR spectra and by atomic force microscope (AFM).