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Journal of the Chilean Chemical Society

On-line version ISSN 0717-9707

Abstract

BARBATO RAVERA, SALVADOR  and  ALVAREZ CHAVEZ, MIGUEL. OPTIMIZATION OF PHYSICO-CHEMICAL MODELS USING THE GAUSS-NEWTON METHOD. J. Chil. Chem. Soc. [online]. 2005, vol.50, n.4, pp.739-743. ISSN 0717-9707.  http://dx.doi.org/10.4067/S0717-97072005000400016.

This study proposes the use of a numerical calculation method for optimizing non-linear physico-chemical models based on the Gauss-Newton algorithm. This method can be applicable to the Wagner-Traud model used to determine the parameters of corrosion and to adsorption isotherm models, like those of Langmuir and Langmuir-Freundlich, to determine the free energy of adsorption. This method in present work was applicated to experimental data of polarization of the iron electrode in medium of sulfuric acid 0.5 M and experimental values of adsorption of 3-Mercaptopropyltrimethoxisilane on copper surface. For the first case (polarization) the results showed with the proposed method was obtained smaller relative errors than the relative errors obtained by the Polynomial method and the computational method of Betacrunch. In the second case, the results showed that the adsorption parameters agree with the model of isotherm of Langmuir-Freundlich, obtaining a free energy of adsorption of 40 kJ/mol

Keywords : Gauss-Newton algorithm; isotherm of Langmuir and Langmuir-Freundlich; Wagner-Traud equation; corrosion current; Tafel slopes; free energy of adsorption.

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