When a constant cathodic current is applied to an aluminium electrode in a Na3A1F6-AlaO, melt at lOlO"C, the potential decreases gradually and linearly with the square root of time to more negative values. Pronounced potential oscillations occurred at cds above 2A/cm2 and the evolution of sodium gas
On the electrochemistry of dissolved aluminium in cryolitic melts
✍ Scribed by Rolf Ødegȧrd
- Publisher
- Elsevier Science
- Year
- 1988
- Tongue
- English
- Weight
- 701 KB
- Volume
- 33
- Category
- Article
- ISSN
- 0013-4686
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Aluminium dissolved in cryolite-alumina melts migrates in the direction of the positive pole by passage of current . By a modified moving boundary technique the dissolved metal was found to separate into two zones with different mobilities . For the cryolite composition at 11100°C the apparent mobil
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Polarization curves obtained with graphite anodes in cryolite alumina melts hy steady state. notential sween and ealvanostatic measurements exhibited three stem at low alumina concentrations. due r ~~~~
The anode gas evolved during anode etIbct (AE) in NasAlF,-AlsO3 melts consists essentiahy of CO, CO, and CFI. The gas composition was found to be very sensitive to the ahunina concentration and to the AE voltage. In laboratory cells the CF, content ranged from 80 % in putSed cryolite to less than 1%
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