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Anodic Corrosion Behavior of NiFe2O4-Based Cermet in Na3AlF6-K3AlF6-AlF3 for Aluminum Electrolysis

Metallurgical and Materials Transactions B volume 46, pages 1257–1261 (2015)Cite this article

Abstract

A (Cu,Ni)/(10NiO-NiFe2O4) cermet was tested as an inert anode for aluminum electrolysis in Na3AlF6-K3AlF6-AlF3 melt at 1173 K (900 °C), and its corrosion behavior was studied. The results show that the low-temperature Na3AlF6-K3AlF6-AlF3 bath is beneficial, improving the service conditions. With the combined effects of the electrolyte composition and the nascent oxygen during electrolysis, the metal phase (Cu,Ni) at the surface of anode will not be leached preferentially, but be transferred into the aluminates including FeAl2O4, NiAl2O4 and CuAl2O4. This is helpful for the anode to improve its corrosion resistance.

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Acknowledgments

The authors thank the State Natural Science Fund (51222403) and the National High-Tech Research and Development Program of China (2008AA030503) for supporting this work.

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, Hunan, 410083, P.R. China

    Zhongliang Tian (Associate Professor), Yanqing Lai (Professor), Shu Yang (Student), Jie Li (Professor) & Yexiang Liu (Professor)

  2. Department of Materials Science and Engineering, Michigan Technological University, Houghton, MI, 49931, USA

    Zhongliang Tian (Associate Professor) & Jiann-Yang Hwang (Professor)

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  1. Zhongliang Tian
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  2. Yanqing Lai
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  3. Shu Yang
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  4. Jie Li
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Correspondence to Yanqing Lai.

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Manuscript submitted June 16, 2014.

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Tian, Z., Lai, Y., Yang, S. et al. Anodic Corrosion Behavior of NiFe2O4-Based Cermet in Na3AlF6-K3AlF6-AlF3 for Aluminum Electrolysis. Metall Mater Trans B 46, 1257–1261 (2015). https://doi.org/10.1007/s11663-015-0328-8

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  • DOI: https://doi.org/10.1007/s11663-015-0328-8

Keywords

  • NiFe2O4
  • Metal Phase
  • Metal Aluminum
  • CuAl2O4
  • NiAl2O4

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