Passive behaviour of tantalum
β Scribed by Werner Wilhelmsen
- Book ID
- 103067522
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 475 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0013-4686
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β¦ Synopsis
The passive behaviour of tantalum has been studied at electrode potentials from 0 to 4 Vsce in aqueous solutions of pH W13 at 25Β°C by quasi-steady (20h) and transient polarization measurements, dc capacitance determinations and coulometric measurements. Tantalum exhibits a quasi-steady passive current varying only a little with the electrode potential, the pH and the presence of HF or Fe. The transients accord
π SIMILAR VOLUMES
Quasi-steady (20 h stabilization) and transient polarization measurements coupled with capacitance and passive film thickness determinations (by cathodic reduction) have been performed on highpurity tin electrodes in a phosphate solution of pH 9.5 and 25Β°C. Over the potential range from -0.3 to 0.6V
The redox system Fe s+'s+ has been reinvestigated in dependence on the concentration of the redox system, the electrode potential, the film thickness d, temperature T and pH. The anodic electron transfer reaction is blocked completely, but cathodic reduction of Fe s+ takes place at large overvoltage