论文部分内容阅读
采用锌铁尖晶石材料作为铝电解惰性阳极，考察了这种阳极在ＮａＦ－ＡｌＦ３－Ａｌ２Ｏ３熔盐中的腐蚀行为，阳极电流密度为０～２．５Ａ／ｃｍ２．实验结果表明，锌铁尖晶石材料在阳极极化条件下的ＮａＦ－ＡｌＦ３－Ａｌ２Ｏ３熔盐中具有很好的耐腐蚀性能．在低电流密度下，阳极材料的腐蚀速度随电流密度的增大而增大，最高的腐蚀速度出现于０．５～０．７５Ａ／ｃｍ２．此后，腐蚀速度随电流密度的增大而降低．实验证明，高阳极电流密度（＞１．５Ａ／ｃｍ２）、熔盐电解质中保持高Ａｌ２Ｏ３含量和低ＮａＦ／ＡｌＦ３摩尔比，对降低阳极材料的腐蚀速度有利，这也将是惰性阳极应用的重要条件．
The zinc-iron spinel was used as the inert anode for aluminum electrolysis. The corrosion behavior of this anode in molten salt of NaF-AlF3-Al2O3 was investigated. The anode current density was 0-2.5 A / cm2. The experimental results show that the zinc-iron spinel has good corrosion resistance in the molten salt of NaF-AlF3-Al2O3 under anodic polarization. At low current density, the corrosion rate of anode material increases with the increase of current density, and the highest corrosion rate appears at 0.5 ~ 0.75A / cm2. Since then, the corrosion rate decreases with increasing current density. Experiments have shown that high anode current density (> 1.5 A / cm2), high Al2O3 content in the molten salt electrolyte, and low NaF / AlF3 molar ratio are beneficial for reducing the corrosion rate of the anode material and will also be important for inert anode applications condition.