Nickel-iron alloy-based anodes for aluminium electrowinning...

C - Chemistry – Metallurgy – 25 – C

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C25C 3/06 (2006.01) C25C 3/12 (2006.01)

Patent

CA 2339011

A method of manufacturing an anode for use in a cell for the electrowinning of aluminium comprises oxidising before cell operation an iron-nickel alloy substrate in an oxygen-containing atmosphere, such as air, at a temperature which is at least 50 ~C, preferably 100 ~C, above the operating temperature of the cell to form on the surface of the iron-nickel substrate a coherent and adherent iron oxide-containing outer layer, in particular a hematite- containing layer having a limited ionic conductivity for oxygen ions and acting as a partial barrier to monoatomic oxygen. The outer layer is electrochemically active for the oxidation of oxygen ions and reduces also diffusion of oxygen to the iron-nickel alloy substrate when the anode is in use.

Ce procédé de fabrication d'une anode utile dans une cellule d'extraction électrolytique d'aluminium consiste, avant extraction dans la cellule, à oxyder un substrat en alliage fer-nickel, dans une atmosphère contenant de l'oxygène, telle que de l'air, à une température de l'ordre d'au moins 50 ·C, de préférence 100 ·C au-dessus de la température de fonctionnement de la cellule, afin de former sur la surface du substrat fer-nickel une couche extérieure cohérente et adhérente contenant de l'oxyde de fer, notamment une couche contenant une hématite, possédant une conductivité ionique limitée à l'égard des ions oxygène et agissant en tant que barrière partielle vis-à-vis de l'oxygène monoatomique. Cette couche extérieure est active sur le plan électrochimique pour oxyder les ions oxygène et elle diminue également la diffusion de l'oxygène vers le substrat en alliage fer-nickel lors de l'utilisation de l'anode.

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