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Adsorption Behaviour of Pyrazolo [3, 4-b] Pyridine on Corrosion of Stainless Steel in HCl Solutions

James, O. O. and Ajanaku, K. O. and Ogunniran, K. O. and Ajani, O. O. and Siyanbola, T. O. and John, M. O. (2011) Adsorption Behaviour of Pyrazolo [3, 4-b] Pyridine on Corrosion of Stainless Steel in HCl Solutions. Trends in Applied Sciences Research, 6 (8). pp. 910-917. ISSN 1819-3579

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Abstract

The properties of stainless steel makes the alloy suitable for many application; but this tends to change at very aggressive conditions thereby making its properties to fail. The corrosion inhibition efficiency of 2-(4-Methyl-3-oxo-2-phenyl-2, 3-dihydro-1H-pyrazolo [3, 4-b] pyridin-4-yl) acetic acid butylester (PP) on stainless steel in HCl solution was studied by weight loss method. The adsorption mechanism was investigated using adsorption isotherms. The experimental data fit Flory-Huggins and Thermodynamic/El-Awady models. The values for free energy of adsorption, ΔGoads, of PP at different surface coverage, θ, were also calculated by applying the mathematical model of Bockris-Swinkels adsorption isotherm. The variation of free energy of adsorption ΔGoads.with surface coverage, θ, was rationalised in term of interaction between adsorbed PP molecules. A possible adsorption model of PP molecules on to the steel surface was suggested.

Item Type: Article
Uncontrolled Keywords: Corrosion inhibitor, stainless steel, free energy, Bockris-Swinkels adsorption isotherm
Subjects: Q Science > QD Chemistry
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering, Science and Mathematics > School of Chemistry
Depositing User: Dr. Kolawole Ajanaku
Date Deposited: 20 Jun 2011 20:35
Last Modified: 20 Jun 2011 20:35
URI: http://eprints.covenantuniversity.edu.ng/id/eprint/192

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