Adsorption assessment of the inhibitive effect of Crateva adansonii on low carbon steel in acidic medium

Abstract

This paper outlines the unique role of Crateva adansonii (CA) leaf extract on low carbon steel in corrosive media. The defensive ability of Crateva adansonii extract was evaluated by gravimetric and gasometric techniques. The result of the experiment indicated that extract of Crateva adansonii exhibit perfectly well on the steel due photochemical species containing in the inhibitive extract thereby blocking both the anodic and cathodic site. The mixed Inhibitive effect of Crateva adansonii were investigated by the kinetic state. The adsorption studies of CA leaf extract obeyed the Langmuir, Freundlich, temkin isotherm but best fitted into Langmuir adsorption isotherm which characterised by physisorption. The range of Ea values (from 46.09 kJ/mol to 60.58 kJ / mol) in the presence of the extract being higher than the free solution. Which suggests strong physical adsorption (physisorption).