Ketorol: New and effective corrosion inhibitor for mild steel in hydrochloric acid solution

Abstract

The corrosion inhibition properties of Ketorol on mild steel corrosion in 1.0 M HCl solution wasstudied using electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and weight loss methods. EIS data were interpreted using CPE in equivalent circuit. Adsorption of the inhibitor on the mild steel surface followed the Langmuir adsorption isotherm. The value of free energy of adsorption (δG°ads) is -35.52 kJ mol-1 indicated that adsorption of Ketorol is a spontaneous process. Ketorol exhibited the highest inhibition efficiency 92.36 % at concentration 300 ppm. © 2012 by ESG (www.electrochemsci.org).