Papers

Journal of Applied Electrochemistry

, Volume 21, Issue 11, pp 1023-1026

Anodization of niobium in sulphuric acid media

  • M. A. Biason GomesAffiliated withLaboratório Interdisciplinar de Electroquímica e Cerâmica, Departamento de Quimica, Universidade Federal de São Carlos
  • , S. OnofreAffiliated withLaboratório Interdisciplinar de Electroquímica e Cerâmica, Departamento de Quimica, Universidade Federal de São Carlos
  • , S. JuantoAffiliated withLaboratório Interdisciplinar de Electroquímica e Cerâmica, Departamento de Quimica, Universidade Federal de São Carlos
  • , L. O. de S. BulhõesAffiliated withLaboratório Interdisciplinar de Electroquímica e Cerâmica, Departamento de Quimica, Universidade Federal de São Carlos

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Abstract

Niobium oxide films of different thicknesses can be produced on niobium electrodes by anodic polarization. The films produced by a galvanostatic method show different interference colours following the expected theoretical succession of colours. An electrical breakdown was observed which showed a significant dependence of the electrolyte concentration and current density. The relationship between the colour and the current density during the anodization of niobium samples are reported for sulphuric acid solutions. In addition the method for preliminary surface preparation of the niobium electrode is described.