Surface oxidised nickel-iron metal anodes for aluminium...

Details Surface oxidised nickel-iron metal anodes for aluminium... Surface oxidised nickel-iron metal anodes for aluminium...

2003-03-12

2008-10-07

Bell, Bruce F. (Department: 1795)

Chemistry: electrical and wave energy

Apparatus

Electrolytic

C204S243100, C205S384000, C205S385000, C420S043000, C420S060000, C420S080000, C420S089000, C420S092000, C420S094000, C420S441000, C420S452000, C420S458000, C420S459000

Reexamination Certificate

active

07431812

ABSTRACT:
An anode for the electrowinning of aluminium by the electrolysis of alumina in a molten fluoride electrolyte has an electrochemically active integral outside oxide layer obtainable by surface oxidation of a metal alloy which consists of 20 to 60 weight % nickel; 5 to 15 weight % copper; 1.5 to 5 weight % aluminium; 0 to 2 weight % in total of one or more rare earth metals, in particular yttrium; 0 to 2 weight % of further elements, in particular manganese, silicon and carbon; and the balance being iron. The metal alloy of the anode has a copper
ickel weight ratio in the range of 0.1 to 0.5, preferably 0.2 to 0.3.

REFERENCES:
patent: 5510008 (1996-04-01), Sekhar et al.
patent: 5904828 (1999-05-01), Sekhar et al.
patent: 6248227 (2001-06-01), de Nora et al.
patent: 6692631 (2004-02-01), Bergsma
J.R. Davis, ASM Specialty Handbook, Dec. 2000, pp. 1-3, Table 2.

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