Nb Electrodissolution in Acid Fluoride Medium : steady state and impedance investigations. - Sorbonne Université Access content directly
Journal Articles Journal of The Electrochemical Society Year : 2002

Nb Electrodissolution in Acid Fluoride Medium : steady state and impedance investigations.

Abstract

The electrochemical behavior of Nb in acid fluoride media has been investigated by voltammetric, steady-state, and impedance techniques as a function of variables like (the total fluoride concentration, varied between 0 and 2 M), pH (0-7), and potential (−1 to 7 V vs. SCE). An active/passive transition is observed, followed by a wide current pseudoplateau where current depends on and pH in a way indicating that HF and related species dissolve the passivating oxide whereas is inactive. Impedance diagrams obtained on this plateau can be reproduced by a literature model (surface charge approach), and the derived parameters may be used to calculate structural and kinetic quantities, as well as the formation ratio of the surface oxide.
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Dates and versions

hal-04227848 , version 1 (04-10-2023)

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Sandro Cattarin, Marco Musiani, Bernard Tribollet. Nb Electrodissolution in Acid Fluoride Medium : steady state and impedance investigations.. Journal of The Electrochemical Society, 2002, 149 (10), pp.B457. ⟨10.1149/1.1502690⟩. ⟨hal-04227848⟩
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