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Kinetic Study on Anodic Growth of Film on Tantalum in Aqueous Succinic Acid

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Author Affiliations

  • 1Department of Chemistry, A. I. J. H. M. College, Rohtak, 124001 (Haryana), INDIA
  • 2Department of Chemistry, D. C. R. Univ. of Sci. and Technol., Sonipat, 131001 (Haryana), INDIA

Res.J.chem.sci., Volume 5, Issue (5), Pages 78-84, May,18 (2015)

Abstract

The present manuscript attempts to investigate the anodic growth of film on tantalum at various current densities (2.5, 5.0, 10.0 and 15.0 mAcm-2) in presence of 0.1N solutions of succinic acid (prepared in 1:1 v/v of ethanol + water) at four different temperatures (288.15, 298.15, 308.15 and 318.15K). The constants A and B of Guntherschulze-Betz empirical equation have been determined. The value of A varied with temperature but the value of B was found independent of temperature, which implies the non-dependence of Tafel slope on temperature. Quadratic variation of field strength with ionic current density was examined critically in view of Dignam model. The zero field activation energy (Φ), dimensionless quantity (C), zero field activation dipole ( μ), net activation energy W (E) and Morse function parameter (w) of Dignam model were evaluated. The effects of temperature and current density on various parameters of Dignam model have been discussed. Quadratic term contributed significantly which elucidates that single-barrier theory does not explain the data satisfactorily.

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