Corrosion inhibition of stainless steel N304 by dihydroxy benzyl phosphonic acid in 0.5 M H2SO4: Experimental and theoretical studies

Abstract

Dihydroxy benzyl phosphonic acid (DPA) has been studied as inhibitor against stainless steel N304 in 0.5 M sulfuric acid solution using the potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The inhibition efficiency was found to vary with the concentration of the inhibitor and elongating the immersion time. Electrochemical impedance spectroscopy (EIS) measurements confirmed the polarization data. The adsorption of (DPA) on the stainless steel N304 surface follow Langmuir adsorption isotherm. The results of quantum chemical calculations and experimental efficiencies of inhibitor were subjected to correlation analysis.