Thermodynamic Parameters of African Cherry (Chrysophyllum albidum) Seed Extract as Green Corrosion Inhibitor on Mild Steel in Acidic Medium
Oluwagbenle Henry Niyi *
Department of Chemistry, Ekiti State University, PMB 5363, Ado –Ekiti, Nigeria.
*Author to whom correspondence should be addressed.
Abstract
Thermodynamic parameters of green corrosion inhibitor capacity of African cherry (Chrysophyllum albidum) seed extraction (ACSE) on mild steel in 2M HCl on varying working temperature using standard analytical procedure and thermodynamic equations were investigated. African cherry seed extract (ACSE) was found to be an effective corrosion inhibition and the efficiency of ACSE increases with rise in temperature. Thermodynamic parameters; ΔH, ΔG, ΔS and the energy of activation (Ea) showed positive values of free energy (ΔG˃0) and enthalpy (ΔH˃0) of the inhibitor which signaled non-spontaneous and endothermic process thereby, protecting the metal steel surface from the environmental heat by minimizing the effect of the mild acid corrosion and the inhibitor was found to be chemisorbed on the metal surface.
Keywords: Thermodynamic, parameters, African, cherry, extract, green, corrosion, inhibitor, mild, steel, acidic, medium.