Behaviour and Material Properties of the Grain Boundary on the Surface of an Anode during the Formation of a Dense Layer

Han Bing He

doi:10.4028/www.scientific.net/AMM.508.61

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 508Behaviour and Material Properties of the Grain...

Behaviour and Material Properties of the Grain Boundary on the Surface of an Anode during the Formation of a Dense Layer

Abstract:

EPMA was used to investigate the corrosion-evolution mechanism of a dense ceramic spinel layer on the surface of NiFe₂O₄-10NiO-based cermet inert anodes during electrolysis in a high-temperature molten salt electrolyte. The evolution behaviour of the grain boundary on the surface of a 22(20Ni-Cu)(NiFe₂O₄-10NiO) anode during the formation of a dense layer was also examined. The experimental results showed that the content of the Al element on the grain boundary at the bottom of both the NiFe₂O₄,NiAl₂O₄and FeAl₂O₄ was higher than that in the core of the 22(20Ni-Cu)(NiFe₂O₄-10NiO) anode, and the content of the Al element between the Ni-Cu and the dense layer of NiFe₂O₄-NiAl₂O₄-FeAl₂O₄ was higher than that in both the NiFe₂O₄,NiAl₂O₄and FeAl₂O₄. It was concluded that the production of the NiAl₂O₄ was due not only to the reaction of the NiO with the Al₂O₂F₄^2-, but also to the oxidisation of the Ni, which then reacted with the Al₂O₂F₄^2-.

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Periodical:

Applied Mechanics and Materials (Volume 508)

Pages:

61-65

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.508.61

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Online since:

January 2014

Authors:

Han Bing He

Keywords:

Aluminium Electrolysis, Grain Boundary, Inert Anode, NiFe₂O₄-NiAl₂O₄-FeAl₂O₄

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