Effect of CaO doping on corrosion resistance of Cu/(NiFe_2O_4-10NiO) cermet inert anode for aluminum electrolysis |
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Authors: | LAI Yan-qing HUANG Li-feng TIAN Zhong-liang WANG Jia-wei ZHANG Gang ZHANG Yong |
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Affiliation: | LAI Yan-qing,HUANG Li-feng,TIAN Zhong-liang,WANG Jia-wei,ZHANG Gang,ZHANG Yong (School of Metallurgical Science , Engineering,Central South University,Changsha 410083,China) |
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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-AI2O3 melt was studied.The results show that the relative density of 5Cu/(NiFe2O4-10NiO) cermet sintered at 1 200 ℃ 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 atceramic grain boundary,which accelerates the penetration of electrolyte.Thus,the corrosion resistance to melts ofCu/(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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Keywords: | aluminum electrolysis Cu/(NiFe2O4-10NiO) cermet CaO inert anode corrosion resistance |
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