Eco-Friendly Corrosion Mitigation of Mild Steel in Sulphuric Acid Medium Using Leaves Extract of Khaya senegalensis

International Journal of Chemistry | Vol. 2, No. 10, October 2011 | pp. 100–107

DOI: 10.46882/2011/IJC/000037

Article Type: Original Research Paper

Title: Eco-Friendly Corrosion Mitigation of Mild Steel in Sulphuric Acid Medium Using Leaves Extract of Khaya senegalensis

Names of Authors: M. A. Haruna¹, S. S. Bala¹*

Authors’ Affiliations:
¹Department of Chemistry, Federal University of Technology, Minna, Nigeria.

Abstract: The degradation of mild steel structures in acidic industrial pickling vats causes substantial economic losses, requiring the development of non-toxic, eco-friendly green corrosion inhibitors. The inhibition efficiency of the aqueous leaf extract of Khaya senegalensis (KS-Extract) on mild steel in 0.5 M H₂SO₄ was evaluated using weight loss and hydrogen evolution measurements at 303–323 K. Weight loss metrics showed that the protection efficiency increased with extract concentration, peaking at 92.4% at a concentration of 1.8 g/L. The hydrogen evolution data confirmed a significant decrease in gas generation rates upon adding the inhibitor. Activation parameters calculated using the Arrhenius expression revealed that the activation energy (Ea) increased from 28.4 kJ/mol in the blank acid to 58.6 kJ/mol in the inhibited system, indicating a physical adsorption process on the mild steel surface. The adsorption behavior of the phytochemical components fit the Langmuir adsorption isotherm model, with standard free energy of adsorption (delta G°ads) values around -20.4 kJ/mol. FT-IR analysis of the corrosion products confirmed that the rich pool of tannins and alkaloids within the extract formed a protective organic passivating layer.

Keywords: Mild steel; Acid corrosion; Green inhibitor; Khaya senegalensis; Hydrogen evolution; Adsorption isotherm

Manuscript Timeline: Received: April 12, 2011; Revised: May 25, 2011; Accepted: June 15, 2011; Published: October 05, 2011.

Citation: Haruna, M. A., & Bala, S. S. (2011). Eco-Friendly Corrosion Mitigation of Mild Steel in Sulphuric Acid Medium Using Leaves Extract of Khaya senegalensis. International Journal of Chemistry, 2(10), 100–107.

Subscribe to read the full article: https://www.internationalscholarsjournals.org/subscribe-to-read