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Anodic polarization of the [(Ta, Nb)C, M; M  Fe, Ni or Co] electrodes in 0.5 M sulphuric acid solution

✍ Scribed by Janusz Kupis; Henryk Scholl; Olivier Vittori

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
876 KB
Volume
37
Category
Article
ISSN
0013-4686

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✦ Synopsis

Ahstiact-The cemented carbides [(Ta, Nb)C, M; M = Fe, Ni or Co] electrode materials were investigated in 0.5 M sulphuric acid solution using the quasi-potentiodynamic polarization method, cyclic voltammetry, and impedance measurements. The polished electrode materials undergo selective anodic dissolution and a mixed oxides porous layer is formed at the surface. Prepolarixation (72 h) in the solution applied in the potential range from open-circuit potential up to E = + 1.8 V, causes the formation of the stable oxides layer. On the basis of the results obtained, a primitive model of the electrode processes and a model of the equivalent circuit have been proposed.

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