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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.
The Fe-40Cr-5Al alloy anode for aluminum electrolysis was prepared by the vacuum induction melting method.The electrolytic corrosion behavior of the alloy anode material was investigated at 800 ℃ and 900 ℃ .The electrolysis test was carried out by using the cryolite-alumina low temperature electrolyte system, the anode current density And the electrolysis time was 10 h. The results showed that the corrosion rate of the alloy anode decreased with the decrease of electrolysis temperature. After 900 ℃ electrolysis, a porous structure corrosion layer was formed on the surface of the alloy. After the electrolysis, a protective oxide film is formed on the surface of the alloy. The oxide film is divided into two layers, the outer layer is Fe (Al, Cr) 2O4 with a spinel structure, the inner layer is a composite oxide composed of Fe, Cr and O, The purity of the collected aluminum products was 98.552%, and the corrosion rate of the alloy anode was 5.51 cm.a-1.