Effective green corrosion inhibition of aluminium using analgin in acidic medium: an experimental and theoretical study

Abstract

The anti-corrosion potency of analgin on the corrosion of aluminum in 0.5 M HCl solution was examined at various concentrations and temperatures (298–328 K) through methods viz., weight loss studies, potentiodynamic polarization techniques, electrochemical impedance spectroscopy (EIS), computational studies and AFM studies. PDP data reveal that all analgin acts as a significant mixed-type effect at high inhibitor concentrations of 4000 ppm. EIS data reveal better adsorption of analgin on aluminum surface at increased inhibitor concentrations reaching a maximum efficiency of 92% at 4000 ppm. Analgin was inclined toward the Langmuir adsorption-isotherm. Furthermore, molecular dynamics simulations have been performed to illustrate the most conceivable adsorption configuration between the inhibitor and metal surface.