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采用等静压气氛烧结法制备NiFe2O4基金属陶瓷惰性阳极,在不同温度下进行电解试验,通过分析电解试样的表层形貌及组织成分,研究电解温度对NiFe2O4基金属陶瓷腐蚀的影响,并对其熔盐腐蚀行为进行探讨.研究结果表明:较高温度有利于电解稳定性的提高及表面致密保护层的形成,在925℃和960℃电解温度下阳极较为稳定,槽电压维持在3.0~4.0V之间;在880℃电解温度下阳极出现肿胀和开裂,槽电压异常升高,Al2O3的溶解度较低,抑制了阳极与电解质熔体(尤其是Al2O3)的交互作用,降低了材料的耐蚀性能.
The NiFe2O4-based cermet inert anode was prepared by isostatic pressing sintering method. The electrolysis test was carried out at different temperatures. The surface morphology and microstructure of the samples were analyzed to study the effect of electrolysis temperature on the corrosion of NiFe2O4-based cermets. The corrosion behavior of molten salt is discussed.The results show that the higher temperature is conducive to the improvement of electrolytic stability and the formation of surface protective layer.The anode is stable at 925 ℃ and 960 ℃ and the cell voltage is maintained at 3.0-4.0 V; at the electrolysis temperature of 880 ℃, the anodes appeared swollen and cracked, the cell voltage increased abnormally, the solubility of Al2O3 was lower, the interaction between the anode and the electrolyte melt (especially Al2O3) was restrained, and the corrosion resistance of the material was reduced performance.