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Metallurgical and Materials Transactions B

, Volume 50, Issue 6, pp 3103–3111 | Cite as

Study of Cu-Ni-Fe Alloys as Inert Anodes for Al Production in Low-Temperature KF-AlF3 Electrolyte

  • Sylvain Jucken
  • Bernard Tougas
  • Boyd Davis
  • Daniel Guay
  • Lionel RouéEmail author
Article
  • 41 Downloads

Abstract

Cu-Ni-Fe-based alloys are considered as promising O2-evolving anode materials for CO2-free Al production. In the present study, biphased (as-cast) and monophased (postcasting homogenized) Cu65Ni20Fe15, alloys, and monophased Ni65Fe25Cu10 alloy (in wt pct) are evaluated as O2-evolving anodes for Al production in potassium cryolite at 700 °C. The produced Al purity is 99.6 wt pct, and the erosion rate is estimated at 0.4 cm year−1 for both Cu65Ni20Fe15 anodes compared to 95.2 wt pct and 3.2 cm year−1 for the Ni65Fe25Cu10 anode. The compositions, and morphologies of the surface oxide layer and the metal fluoride layer present at the oxide/alloy interface are compared for the three anodes. The deleterious impact of electrolyte infiltration on the surface oxide building is highlighted.

Notes

Acknowledgments

The authors thank the Natural Sciences and Engineering Research Council of Canada (NSERC) (Grant STPGP 494283-16), Prima Québec (Grant R13-13-001), Metal7, and Kingston Process Metallurgy for supporting this work.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  • Sylvain Jucken
    • 1
  • Bernard Tougas
    • 2
  • Boyd Davis
    • 3
  • Daniel Guay
    • 1
  • Lionel Roué
    • 1
    Email author
  1. 1.INRS-Énergie Matériaux TélécommunicationsVarennesCanada
  2. 2.Centre de Métallurgie du Québec (CMQ)Trois-RivièresCanada
  3. 3.Kingston Process Metallurgy IncKingstonCanada

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