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Scirj Volume X, Issue III, March 2022 Edition
ISSN: 2201-2796

Investigation of Corrosion inhibition potentials of Landolphia dulcis Extract on Mild Steel in Acidic Medium

Precious O. Emole, Kelechi E Onwuka, Pauline U Chris-Okafor

Abstract: The effectiveness of Landolphia dulcis extract; an eco-friendly corrosion inhibitor on mild steel in acidic medium was studied using gravimetric (weight loss) and gasometric (hydrogen evolution) techniques considering the kinetic and thermodynamic parameters necessary in corrosion test. The experimental results obtained revealed excellent inhibition properties for the extract even at higher temperatures (333 & 353 K) with the highest inhibition efficiency of 84.09% which is attributed to the presence of heteroatoms seen in the FT-IR spectrum. The calculated values of activation energy (Ea) were all positive which increased with increase in the concentration of the extract indicating a higher energy barrier required for further deterioration of the metal and the average activation energy of 27.17 kJ/mol denotes physical adsorption mechanism. Fairly linear rate constants deduced that the process is of first order reaction. Also, the feasibility of reaction is evidenced by negative ΔGads values. The experimental data best fitted Langmuir and Temkin isotherm models depicting a monolayer formation as well as strong interaction between the metal substrate and the inhibitor molecules.

Reference this Paper: Investigation of Corrosion inhibition potentials of Landolphia dulcis Extract on Mild Steel in Acidic Medium by Precious O. Emole, Kelechi E Onwuka, Pauline U Chris-Okafor published at: "Scientific Research Journal (Scirj), Volume X, Issue III, March 2022 Edition, Page 1-13 ".

Search Terms: Mild steel, Kinetic studies, Thermodynamic studies, Adsorption studies, Corrosion inhibitor and Landolphia dulcis

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