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Metallurgical and Materials Transactions B

Published in:

01-06-2015

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

Authors: Zhongliang Tian, Yanqing Lai, Shu Yang, Jie Li, Jiann-Yang Hwang, Yexiang Liu

Published in: Metallurgical and Materials Transactions B | Issue 3/2015

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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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Title: Anodic Corrosion Behavior of NiFe2O4-Based Cermet in Na3AlF6-K3AlF6-AlF3 for Aluminum Electrolysis
Authors: Zhongliang Tian
Yanqing Lai
Shu Yang
Jie Li
Jiann-Yang Hwang
Yexiang Liu
Publication date: 01-06-2015
Publisher: Springer US
Published in: Metallurgical and Materials Transactions B / Issue 3/2015
Print ISSN: 1073-5615
Electronic ISSN: 1543-1916
DOI: https://doi.org/10.1007/s11663-015-0328-8

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