Protective coating of stub ends in anode assemblies

Details Protective coating of stub ends in anode assemblies Protective coating of stub ends in anode assemblies

1991-06-10

1992-10-13

Valentine, Donald R.

Chemistry: electrical and wave energy

Apparatus

Electrolytic

204294, C25C 312, C25C 310

Patent

active

051548135

ABSTRACT:
The operating lifetime of mild steel stub ends in anode electrode assemblies for aluminum reduction cells is increased by providing a coating of stainless steel or other corrosion-resistant alloy on the stub end extending upward from its juncture with a carbon block anode in which the stub end is embedded. This prevents corrosion and resulting necking down of the stub, which would otherwise occur as a result of exposure of the stub end to fluorine or fluorine containing gases as well as solid particles. The coating may be applied by welding or metalizing procedures.

REFERENCES:
patent: 3536460 (1970-10-01), Voelker
patent: 4354918 (1982-10-01), Boxall et al.
patent: 4787965 (1988-11-01), Audras et al.
patent: 4946502 (1990-08-01), Audras et al.
E. J. Westerman et al., "Puncher Tip Alloys for Aluminum Reduction Cells", Journal of Metals, Nov. 1984, pp. 29-32.

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