Chemical and electrochemical behaviour of titanium oxide and complexes in cryolite-alumina melts

S. V. Devyatkin, G. Kaptay, J. C. Poignet, J. Bouteillon

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

In the present paper the possibility of in-situ production of aluminium-titanium alloys in aluminium electrolysis cells is discussed. Thermodynamic calculations showed, that TiO2 is reduced to lower titanium oxides both by carbon anode and aluminium cathode, leading to the passivation of both the electrode surfaces. CaTiO3 was found to be the best form to introduce TiO2 into the melt, preventing passivation of electrodes. Linear voltammetry experiments proved, that in cryolite-alumina melt with TiO2 addition the process is taking place in 2 steps: Ti(IV)+e→ Ti(III) + 3 e → Ti(0), while with addition of MgTiO3 or CaTiO3 deposition of Ti takes place in one irreversible step: Ti(IV) + 4e → Ti(0). Finally CaTiO3 dissolved in the cryolite-alumina melts is suggested to be the best candidate to produce aluminium-titanium alloys from the aluminium electrolysis cells.

Original languageEnglish
Pages (from-to)497-506
Number of pages10
JournalHigh Temperature Material Processes
Volume2
Issue number4
Publication statusPublished - 1998

Fingerprint

cryolite
Aluminum Oxide
Titanium oxides
titanium oxides
Alumina
aluminum oxides
titanium alloys
electrolysis
Aluminum
aluminum
Titanium alloys
Electrolysis
Passivation
aluminum alloys
passivity
Aluminum alloys
Electrodes
electrodes
Voltammetry
cells

Keywords

  • Aluminium electrolysis cells
  • Aluminium-titanium alloys
  • CaTiO
  • Cryolite melts
  • Voltammetry

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Chemical and electrochemical behaviour of titanium oxide and complexes in cryolite-alumina melts. / Devyatkin, S. V.; Kaptay, G.; Poignet, J. C.; Bouteillon, J.

In: High Temperature Material Processes, Vol. 2, No. 4, 1998, p. 497-506.

Research output: Contribution to journalArticle

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AU - Poignet, J. C.

AU - Bouteillon, J.

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AB - In the present paper the possibility of in-situ production of aluminium-titanium alloys in aluminium electrolysis cells is discussed. Thermodynamic calculations showed, that TiO2 is reduced to lower titanium oxides both by carbon anode and aluminium cathode, leading to the passivation of both the electrode surfaces. CaTiO3 was found to be the best form to introduce TiO2 into the melt, preventing passivation of electrodes. Linear voltammetry experiments proved, that in cryolite-alumina melt with TiO2 addition the process is taking place in 2 steps: Ti(IV)+e→ Ti(III) + 3 e → Ti(0), while with addition of MgTiO3 or CaTiO3 deposition of Ti takes place in one irreversible step: Ti(IV) + 4e → Ti(0). Finally CaTiO3 dissolved in the cryolite-alumina melts is suggested to be the best candidate to produce aluminium-titanium alloys from the aluminium electrolysis cells.

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