Abstract
The dissolution behaviour of the anodized niobium electrode in NaOH solutions was investigated as a function of alkali concentration, formation voltage, formation current density and temperature using potential and impedance measurements. The rate of dissolution is dependent on the alkali concentration. In dilute NaOH solutions (1 N) the anodic oxide film formed in 0.5 M H2SO4 is reasonably stable. On the other hand, at higher concentrations of NaOH (≥2 M), the anodized electrode is subject to continuous dissolution depending on the alkali concentration. Also, the dissolution process is considerably affected by temperature; at temperatures greater than 320 K the oxide film is destroyed in less than 30 min. The results show that the current density used during the formation of the oxide film has no effect on its dissolution rate.
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Badawy, W.A., Gad-Allah, A.G. & Rehan, H.H. Kinetics of the dissolution behaviour of anodic oxide films on niobium in NaOH solutions. J Appl Electrochem 17, 559–566 (1987). https://doi.org/10.1007/BF01084130
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DOI: https://doi.org/10.1007/BF01084130