Coated metal electrode with improved barrier layer
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United States of America Patent
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May 25, 1982
Grant Date -
N/A
app pub date -
Oct 6, 1980
filing date -
Oct 6, 1980
priority date (Note) -
Expired
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Abstract
An electrode for use in electrolytic processes comprises a substrate of film-forming metal such as titanium having a porous electrocatalytic coating comprising at least one platinum-group metal and/or oxide thereof possibly mixed with other metal oxides, in an amount of at least about 2 g/m.sup.2 of the platinum-group metal(s) per projected surface area of the substrate. Below the coating is a preformed barrier layer constituted by a surface oxide film grown up from the substrate. This preformed barrier layer has rhodium and/or iridium as metal or compound incorporated in the surface oxide film during formation thereof in an amount of up to 1 g/m.sup.2 (as metal) per projected surface area of the substrate.
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