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Effect of CaO doping on corrosion resistance of Cu/(NiFe2O4-10NiO) cermet inert anode for aluminum electrolysis

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Abstract

The CaO-doped Cu/(NiFe2O4-10NiO) cermet inert anodes were prepared by the cold isostatic pressing-sintering process, and their corrosion resistance to Na3AlF6-K3AlF6-Al2O3 melt was studied. The results show that the relative density of 5Cu/(NiFe2O4-10NiO) cermet sintered at 1 200 °C increases from 82.83% to 97.63% when 2% CaO (mass fraction) is added. During the electrolysis, the relative density of cermet inert anode descends owing to the chemical dissolution of additive CaO at ceramic grain boundary, which accelerates the penetration of electrolyte. Thus, the corrosion resistance to melts of Cu/(NiFe2O4-10NiO) cermet inert anode is reduced. To improve the corrosion resistance of the cermet inert anode, the content of CaO doped should be decreased and the technology of cleaning the ceramic grain boundary should be applied.

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Authors and Affiliations

  1. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China

    Yan-qing Lai  (赖延清), Li-feng Huang  (黄礼峰), Zhong-liang Tian  (田忠良), Jia-wei Wang  (王家伟), Gang Zhang  (张 刚) & Yong Zhang  (张 勇)

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  1. Yan-qing Lai  (赖延清)
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  2. Li-feng Huang  (黄礼峰)
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  3. Zhong-liang Tian  (田忠良)
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  4. Jia-wei Wang  (王家伟)
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  5. Gang Zhang  (张 刚)
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  6. Yong Zhang  (张 勇)
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Correspondence to Yan-qing Lai  (赖延清).

Additional information

Foundation item: Project(2005CB623703) supported by the Major State Basic Research and Development Program of China; Project(2008AA030503) supported by Hi-Tech Research and Development Program of China

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Lai, Yq., Huang, Lf., Tian, Zl. et al. Effect of CaO doping on corrosion resistance of Cu/(NiFe2O4-10NiO) cermet inert anode for aluminum electrolysis. J. Cent. South Univ. Technol. 15, 743–747 (2008). https://doi.org/10.1007/s11771-008-0137-1

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  • DOI: https://doi.org/10.1007/s11771-008-0137-1

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