铝电解用NiFe_2O_4基金属陶瓷惰性阳极电解腐蚀研究  

Electrolytic corrosion of NiFe_2O_4 based cermet inert anode in aluminum electrolysis

作　　者：黄有国[1] 李庆余[1] 王红强[1] 

机构地区：[1]广西师范大学化学化工学院,广西桂林541004

出　　处：《功能材料》2010年第12期2223-2226,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21063003);国家高技术研究发展计划(863计划)资助项目(2008AA030503)

摘　　要：采用传统粉末冶金技术制备了铝电解用5Cu/(NiFe2O4-10NiO)金属陶瓷惰性阳极,并对其在20和40℃过热度下Na3AlF6-AlF3-Al2O3电解质中的电解腐蚀进行了研究。研究结果表明,过热度的升高对电解后阳极的外观形貌无明显的影响。不同过热度下阳极边部均存在腐蚀现象,但阳极内部相对保持完好。低温电解槽电压比传统电解温度槽电压波动大。过热度升高槽电压波动幅度降低。20和40℃过热度下,Fe、Ni和Cu腐蚀组元在电解质中的平衡浓度分别为140×10-6、35×10-6、44×10-6和142×10-6、36×10-6、34×10-6。过热度的升高对阳极腐蚀组元在电解质中的平衡浓度无明显影响。电解温度的降低减小了阳极腐蚀组元在电解质中的平衡浓度。The 5Cu/（NiFe2O4-10NiO）cermet inert anode was developed by classical powder metallurgical technique.The corrosion behaviors of NiFe2O4-based inert anodes in Na3AlF6-AlF3-Al2O3 melts were investigated at 20 and 40℃ superheat respectively.The results show that the increase of superheat has no significant effect on anode appearance.The anodes edge are corroded,but the inner structure of anode keeps intact at different superheat.The cell voltage is larger in low electrolysis temperature than that in traditional electrolysis temperature.The fluctuation of cell voltage decreases during the increase of superheat.The equilibrium concentration of Fe,Ni,and Cu are 1.4×10-4,3.5×10-5 and 4.4×10-5 in 20℃ superheat and 1.42×10-4,3.6×10-5 and 3.4×10-5 in 40℃ respectively.The increase of superheat has no significant effect on the equilibrium concentration of corrosion constituent in electrolyte and the decrease of electrolysis temperature results in the decrease of the equilibrium concentration of corrosion constituent in electrolyte.

关 键 词：NiFe2O4基金属陶瓷 惰性阳极 过热度 电解腐蚀 铝电解 

分 类 号：TF18[冶金工程—冶金物理化学]