Oxygen Evolving Anodes for Aluminum Electrolysis

Abstract

Salt mixtures based on sodium or/and potassium fluorides were tested as electrolyte for oxygen evolving anodes. Electrolyte compositions used in experiments were suggested on the basis of suitable alumina solubility and dissolution rate in the previous papers. Platinum, cermets and Ni-Cu-Fe based metal alloys were tested as inert anodes. Preferable inert anode materials with low polarization, suitable high current density range and low corrosion rate for low-temperature electrolyte systems were proposed.