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Nickel ferrite ceramics was sintered in air atmosphere and nitrogen atmosphere respectively and their electrolysis corrosion in aluminum electrolysis at 960 was examined. ℃ X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis were used to analyse the phase composition and microstructure. The phase composition, electrical conductivity and molten salt corrosion behavior were investigated regarding different sintering atmospheres. The electrical conductivity and molten salt corrosion resistance of the samples sintered in nitrogen increased drastically compared to those sintered in air, attributing to the effects of the lower oxygen partial pressure and the formation of dense protective layer on the surface during electrolysis. The conductive mechanism and molten salt corrosion mechanisms were also discussed.