Metal-based anodes for aluminium production cells

C - Chemistry – Metallurgy – 25 – C

Patent

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C25C 3/12 (2006.01)

Patent

CA 2437671

A metal-based anode substrate of a cell for the electrowinning of aluminium comprises a nickel-alloy based core, a layer of silver on the core and a layer comprising nickel and iron covering the silver layer and serving as an anchorage layer for anchoring an electrochemically active surface coating on top of the anode substrate. The electrochemically active coating may be a cerium-based coating. The silver layer inhibits diffusion of fluoride species into the core and prevents interdiffusion of constituents of the core and constituents of the anchorage layer.

L'invention concerne un substrat d'anode à base de métal pour cellule d'électro-obtention d'aluminium, qui comprend une partie centrale à base d'alliage de nickel ; une couche d'argent sur la partie centrale ; et une couche contenant du nickel et du fer, qui recouvre la couche d'argent et sert de couche d'ancrage pour ancrer un revêtement de surface électrochimiquement actif constituant la couche supérieure du substrat d'anode. Le revêtement de surface électrochimiquement actif peut être un revêtement à base de cérium. La couche d'argent permet d'inhiber la diffusion d'espèces fluorure dans la partie centrale et de prévenir une interdiffusion entre constituants de la partie centrale et constituants de la couche d'ancrage.

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