The equilibrium potential of the cell Alup 1 NatiF, + A1808c,t, 1 Pt, 0, was determined from potential-decay curves to be 2.205 V at 1000°C. A Tafel plot of the anodic overvoltage. shows two straight portions with slopes RT/3F and RT/F, indicating a two-step discharge reaction of oxygen, with exchan
On porosity-overvoltage correlation for carbon anodes in cryolite-alumina melts
✍ Scribed by S. Zuca; C. Herdlicka; M. Terzi
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 536 KB
- Volume
- 25
- Category
- Article
- ISSN
- 0013-4686
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At cds above a crrtical cd, oxygen drscbarge on carbon m cryoltte-elumma melts IS l&ted bv dBuston-controlled deuletton of dtssolved alumma. followed bv the anode effect In melts wtth 2% pond6raux Al& 1+/\\*/C d6croit lm&irement a densite de courant crorssante pour des temps de transttion comprts en
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
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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%