Skip to main content

Corrosion of nickel ferrite refractory by Na3AlF6-AlF3-CaF2-Al2O3 bath

Journal Article


Abstract


  • Based on research on cermet inert anodes for aluminium production, it has been suggested

    that nickel ferrite spinel might be suitable for use as a sidewall refractory in Hall-Héroult

    cells. A corrosion resistant sidewall would allow elimination of the frozen bath ledge, and has

    potentially huge benefits in terms of energy savings and increased productivity. However,

    little work has been done to assess nickel ferrite’s suitability as a refractory.

    Dense nickel ferrite samples were prepared and characterized, and corrosion tests in cryolite

    based baths were conducted. Results confirm that the spinel does have good corrosion

    resistance. The corrosion mechanism is complex, involving grain boundary attack and

    formation of a Ni – Fe alloy. This alloy could pose a risk in terms of contamination of the

    aluminium. The use of additives to restrict penetration of grain boundaries may be the key to

    development of a successful spinel based refractory.

Publication Date


  • 2013

Citation


  • Nightingale, S. A., Longbottom, R. L. & Monaghan, B. J. (2013). Corrosion of nickel ferrite refractory by Na3AlF6-AlF3-CaF2-Al2O3 bath. Journal of the European Ceramic Society, 33 (13-14), 2761-2765.

Scopus Eid


  • 2-s2.0-84879842695

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1095

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 2761

End Page


  • 2765

Volume


  • 33

Issue


  • 13-14

Place Of Publication


  • United Kingdom

Abstract


  • Based on research on cermet inert anodes for aluminium production, it has been suggested

    that nickel ferrite spinel might be suitable for use as a sidewall refractory in Hall-Héroult

    cells. A corrosion resistant sidewall would allow elimination of the frozen bath ledge, and has

    potentially huge benefits in terms of energy savings and increased productivity. However,

    little work has been done to assess nickel ferrite’s suitability as a refractory.

    Dense nickel ferrite samples were prepared and characterized, and corrosion tests in cryolite

    based baths were conducted. Results confirm that the spinel does have good corrosion

    resistance. The corrosion mechanism is complex, involving grain boundary attack and

    formation of a Ni – Fe alloy. This alloy could pose a risk in terms of contamination of the

    aluminium. The use of additives to restrict penetration of grain boundaries may be the key to

    development of a successful spinel based refractory.

Publication Date


  • 2013

Citation


  • Nightingale, S. A., Longbottom, R. L. & Monaghan, B. J. (2013). Corrosion of nickel ferrite refractory by Na3AlF6-AlF3-CaF2-Al2O3 bath. Journal of the European Ceramic Society, 33 (13-14), 2761-2765.

Scopus Eid


  • 2-s2.0-84879842695

Ro Metadata Url


  • http://ro.uow.edu.au/eispapers/1095

Has Global Citation Frequency


Number Of Pages


  • 4

Start Page


  • 2761

End Page


  • 2765

Volume


  • 33

Issue


  • 13-14

Place Of Publication


  • United Kingdom