METAL-BASED ANODES FOR ALUMINIUM ELECTROWINNING CELLS

摘要

An anode of a cell for the electrowinning of aluminium comprises a nickel-ir on alloy substrate having an openly porous nickel metal rich outer portion whos e surface is electrochemically active. The outer portion is optionally covered with an external integral nickel-iron oxide containing surface layer which adheres to the nickel metal rich outer portion of the nickel-iron alloy and which in use is pervious to molten electrolyte. During use, the nickel metal rich outer portion contains cavities some or all of which are partly or completely filled with iron and nickel compounds, in particular oxides, fluorides and oxyfluorides.