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对比研究了不同烧结气氛条件下制备的17Ni/(NiFe_2O_4-10NiO)金属陶瓷惰性阳极在Na_3Al F_6-Al_2O3_熔体中的耐腐蚀性能。研究结果表明,在真空和氧含量为2×10~(-3)(体积分数)气氛下制备的NiFe_2O_4基金属陶瓷阳极电解腐蚀率分别为6.46和2.71 cm/a。尽管电解后阳极过渡层中出现了许多孔洞,但在反应新生成的铝酸盐作用下,阳极表面形成了一层致密层。对于氧含量为2×10~(-3)气氛下制备的阳极,其表面电解后生成的致密层厚度(约为50μm)大于真空条件下阳极表面所生成的致密层厚度(约为30μm)。随着烧结气氛中氧含量的降低,所获材料中NiO和NiFe_(2x)O_(4-y-z)中Fe(II)的含量均增加,材料的抗腐蚀能力降低。
The corrosion resistance of 17Ni / (NiFe 2 O 4 -10NiO) noble metal anodes in Na 3 Al F 6 -Al 2 O 3 melt was compared and studied under different sintering atmospheres. The results show that the electrolytic corrosion rates of NiFe 2 O 4 -based cermets prepared under vacuum and oxygen content of 2 × 10 -3 (volume fraction) are 6.46 and 2.71 cm / a, respectively. Although many pores appeared in the anode transitional layer after electrolysis, a dense layer was formed on the anode surface under the reaction of newly formed aluminate. For the anodes prepared at an oxygen content of 2 × 10 -3, the thickness of the dense layer (about 50 μm) formed on the surface of the anode after electrolysis is greater than the thickness of the dense layer (about 30 μm) formed on the anode surface under vacuum. With the decrease of oxygen content in the sintering atmosphere, the contents of Ni (II) and Ni (Fe) (2-y) O 4 -y-z in the obtained materials all increased and the corrosion resistance of the materials decreased.