The Corrosion Performance of a Binary Cu-Ni Alloy used as an Anode for Aluminum Electrolysis

摘要

A binary Cu-Ni alloy (69.93 wt.% Ni+Co) has been investigated as a potential inert anode in a laboratory electrolysis cell. When the electrolyte temperature, electrolyzing time and polar distance were set to be 960°C, 4 h and 3 cm respectively, the corrosion resistance of Cu-Ni alloy materials in aluminum electrolyte was studied in the electrolyte composed of synthetic cryolite, alumina, aluminum fluoride, magnesium fluoride, calcium fluoride and aluminum by changing the molecular ratio of electrolyte, the concentration of alumina and current density of electrolyte, respectively. The results shows that the Cu-Ni alloy materials could reduce material loss when the electrolyte is with the optional conditions of the content of alumina in electrolyte approaching to 6 wt.%, the molecular ratio at about 2.2 and current density near to 0.5A/cm~2. Thus the corrosion ratio of Cu-Ni alloy per year was measured to be 1.27cm/a.