Fe-40Cr-5Al合金阳极在800℃和900℃的电解腐蚀行为  

Electrolysis corrosion behaviors of Fe-40Cr-5Al alloy anodes at 800℃ and 900℃

作　　者：朱宇平[1] 何业东[1] 王德仁[1] 

机构地区：[1]北京科技大学北京腐蚀与磨蚀表面技术实验室,北京100083

出　　处：《北京科技大学学报》2011年第12期1485-1491,共7页Journal of University of Science and Technology Beijing

基　　金：国家高技术研究发展计划资助项目(2008AA030503-4)

摘　　要：采用真空感应熔炼法制备了铝电解用Fe-40Cr-5Al合金阳极.研究了合金阳极材料在800℃和900℃下的电解腐蚀行为.电解测试采用冰晶石-氧化铝低温电解质体系,阳极电流密度为0.5 A.cm-2,电解时间为10 h.结果表明:随着电解温度的降低,合金阳极的腐蚀速率减小;在900℃电解后,合金表面形成了多孔结构的腐蚀层;在800℃电解后,合金表面形成了保护性氧化膜,氧化膜分为两层,外层为尖晶石结构的Fe(Al,Cr)2O4,内层为Fe、Cr和O构成的复合氧化物,其中收集的铝产品纯度为98.552%,合金阳极的腐蚀速率为5.51 cm.a-1.Fe-40Cr-5Al alloy anodes were prepared by vacuum induction melting for aluminum electrolysis.The electrolysis corrosion behaviors of the alloy anodes at 800℃ and 900℃ were investigated.Aluminum electrolysis tests were conducted in a cryolite-alumina low-temperature electrolyte system,at an anodic current density of 0.5A·cm-2 for 10h.The results indicated that the corrosion rate of the alloy anodes reduced with decreasing electrolysis temperature.After electrolysis at 900℃,there was a porous corrosion layer on the anode surface,while a protective oxide scale formed after electrolysis at 800℃.The oxide scale was divided into two layers,in which the outer layer was a Fe（Al,Cr） 2O4 spinel and the inner layer was a composite oxide consisting of Fe,Cr and O.The purity of the collected aluminium products after electrolysis at 800℃ was 98.552% and the corrosion rate of the alloy anodes was 5.51cm·a-1.

关 键 词：铝电解 惰性阳极 铁合金 腐蚀 氧化 

分 类 号：TF821[冶金工程—有色金属冶金]