铝电解用NiFe_2O_4-10NiO基陶瓷铁元素优先腐蚀研究  

Preferential corrosion of Fe element in NiFe_2O_4-10NiO based ceramic for aluminum electrolysis

作　　者：何汉兵[1,2] 刘锋[1] 宋云峰[1] 肖汉宁[2] 

机构地区：[1]中南大学冶金科学与工程学院,湖南长沙410083 [2]湖南大学材料科学与工程学院,湖南长沙410082

出　　处：《功能材料》2012年第10期1239-1243,共5页Journal of Functional Materials

基　　金：中国博士后科学基金资助项目(2011M500959);教育部中央高校基本科研经费资助项目(201012200021);中南大学2011年本科生自由探索计划立项资助项目(ZL11005)

摘　　要：在高温熔盐电解质78.07%Na3AlF6-9.5%AlF3-5.0%CaF2-7.43%Al2O3中对NiFe2O4-10NiO基陶瓷进行了电解腐蚀性能研究,结果发现烧结后的陶瓷NiFe2O4相中的Fe/Ni比为2.211～2.89,且NiO相的Fe/Ni比为0.136～0.34,而电解腐蚀后NiFe2O4相中的Fe/Ni比为2.07～2.335,且NiO相中Fe/Ni比为0.120～0.195,说明在电解腐蚀过程中Fe元素发生了优先腐蚀。铁元素在电解过程中发生优先腐蚀的原因可能是化学腐蚀和电化学腐蚀共同作用的结果。The electrolysis corrosion performance of NiFe2 O4-10NiO based ceramic was investigated in high tem- perature melt of 78.07%Na3AlF6G-9.5%AlF3-5.0%CaF2-7.43%A12O3. The results showed that Fe/Ni atomic ratio in NiFe2 O4 and NiO phase after sintered is 2. 211-2.89 and 0. 136-0.34, respectively, but Fe/Ni atomic ratio in NiFe2 04 and NiO phase after electrolysis is 2.07-2. 335 and 0. 120-0.195, respectively. So the Fe/Ni atomic ra- tio in NiFe2 04 and NiO phase decreased in some extent and preferential corrosion of Fe element happened in the process of aluminum electrolysis. Possibly the synergism of chemical corrosion and electrochemical corrosion re- sult in the preferential corrosion dissolution of Fe element.

关 键 词：NiFe2O4-10NiO基陶瓷 铁元素 优先腐蚀 惰性阳极 铝电解 

分 类 号：TF821[冶金工程—有色金属冶金]