Anodic growth of passive films on niobium and tantalum
✍ Scribed by Sverre Hornkjøl
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 359 KB
- Volume
- 36
- Category
- Article
- ISSN
- 0013-4686
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📜 SIMILAR VOLUMES
The title subject is studied by galvanostatic E-t curves on 20 h stabilized passive tin electrodes in weakly alkaline phosphate solution (pH9.5) at 25°C. These curves generally exhibit a small initial superpolarization ascribed to transient changes in the surface density of kinks (s) by the current
The physico-chemical properties of the anodic niobium oxide films grown potentiodynamically in 1M Na CO solutions were studied. Capacj ' ty measurements and Schottky-Mott plots wer $ obtained for different thicknesses. A phenomenological description of the oxide film behaviour is reported.
The variations of the equivalent parallel resistance and capacitance of anodic films formed on Ta and Nb in varying concentrations of H2SO4 suggest that the volume of film formed per coulomb is much greater in 100)~, acid, although the dielectric constant is substantially unchanged. The field requir