THERMODYNAMIC AND ADSORPTION STUDIES OF CORROSION OF ALUMINIUM IN ALKALINE MEDIUM BY EXTRACT OF Balanites aegyptiaca
Autors: B. El-yaqub, S. O. Okeniyi, H. A. Otaru, O. O. Okeniyi, Z. H. Ibrahim
Date: Dec 02, 2020
Edition: September 2020 Edition
Volume: 1
Issue: 2
Pages: 12 (41 - 52)
Abstract:
Abstract The effect of the ethanolic extract of Balanites aegyptiaca on the corrosion of Aluminium in alkaline medium was studied by weight measurement, thermometric method, IR studies and theoretical methods. Results from the aforementioned method strongly suggested that the plant extract is a good corrosion inhibitor. The adsorption of the inhibitor on the surface of the metal is in concordance with the Langmuir isotherm. Physiosorption mechanism is proposed from the calculated thermodynamic parameters. Quantum chemical studies suggested the inhibitor potentials of the of the extracts correlates well with the dipole moment of the molecules, the energy gap (ΔE) and the fraction of electron transfer from the inhibitor to the metal (δ). Key words: DFT, Dipole moment, Corrosion inhibition.
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