Electrode coating process

Details Electrode coating process Electrode coating process

1977-04-14

1978-09-05

Weiffenbach, Cameron K.

Coating processes

Electrical product produced

Metallic compound coating

204290F, 427380, B05D 512

Patent

active

041121406

ABSTRACT:
A method to produce an electrode by coating at least a portion of a valve metal substrate sequentially with first and second liquid solutions containing different proportions of dissolved ruthenium and valve metal values; the second solution having a greater valve metal to ruthenium weight ratio than the first solution. At least a portion of the substrate is contacted with a first liquid solution containing ruthenium and the valve metal in amounts of from about 1 to about 50 milligrams per milliliter of the solution. The weight ratio of the valve metal to ruthenium in the first solution is from about 1:4 to about 2:1. The so-contacted surface is heated to oxidize the deposited ruthenium and valve metal values. Thereafter at least the oxidized surface is contacted with a second solution containing dissolved valve metal and ruthenium values in a weight ratio of from about 20:1 to about 2:1 and heated to oxidize the deposited metal values.

REFERENCES:
patent: 3632498 (1972-01-01), Beer
patent: 3711385 (1973-01-01), Beer
patent: 3773554 (1973-11-01), Scrutton et al.
patent: 3776834 (1973-12-01), O'Leary
patent: 3869312 (1975-03-01), Moss et al.

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