C - Chemistry – Metallurgy – 25 – B
Patent
C - Chemistry, Metallurgy
25
B
117/109, 204/195
C25B 11/08 (2006.01) C25B 11/04 (2006.01)
Patent
CA 1155087
-26 - ABSTRACT OF THE DISCLOSURE A method to produce an electrode by coating at least a portion of a valve metal substrate sequen- tially 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. The so-contacted surface is heated to oxidize the deposited ruthenium and valve metal values. Thereafter at least the oxidized 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 and heated to oxidize the deposited metal values. 18,326A-F -26-
311361
Heikel Henrik R.
Leddy James J.
Smart & Biggar
The Dow Chemical Company
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