Cu-Ni-Al惰性金属阳极铝电解应用测试

Cu-Ni-Al Superalloy as Inert Metal Anode for Aluminum Electrolysis

采用Cu Ni Al合金作金属阳极 ,在温度 75 0～ 85 0℃ ,电流密度 0 75～ 1 1 0A/cm2 的不同分子比和氧化铝质量分数的Na3 AlF6 NaCl CaF2 Al2 O3 熔盐中进行电解测试·结果表明 ,在不同电解操作条件下该阳极材料的腐蚀程度不一样 ,阳极在熔盐中的腐蚀速率远大于在空气中的氧化腐蚀速率 ,而且阳极电解的腐蚀速率与电解质中的氧化铝质量分数相关 ,氧化铝质量分数大 ,则阳极腐蚀速率小·另外 。

Cu-Ni-Al alloy anode was investigated at 750～850?℃ in different concentration of Al 2O 3 and cryolite ratio molten salt which consisted of Na 3AlF 6-NaCl-CaF 2-Al 2O 3. Anodic current density was set from 0 75?A/cm 2 to 1 1?A/cm 2. The results indicate that wear rate of the anode is different under various electrolysis operational conditions. The corrosion wear rate is much higher in the molten salt than in air atmosphere. Electrolysis corrosiveness of the anode relies on the concentration of Al 2O 3 in the molten salt. The higher concentration of Al 2O 3 in electrolyte, the lower wear rate is. Like carbon anode, the Cu-Ni-Al inert metal anode shows very light corrosiveness at high anodic current density. The Cu-Ni-Al alloy shows a good potential as an inert metal anode material.