Electrode for electrochemical processes

Claim 1

In an electrode for electrode processes and comprising a valve metal as a base member the improvement which comprises: a. a base layer coated on said base member and comprising an electrically conductive chemical element having no substantial valve effect; and b. a gas-tight and liquid-tight cover layer on said base layer and comprising: 1. a valve metal oxide selected from the group consisting of titanium dioxide and tantalum oxide; 2. a doping material to increase the electrical conductivity of said valve metal oxide and comprising, when titanium oxide is said valve metal oxide, an oxide selected from the oxides of niobium, tungsten, molybdenum, antimony, and tin and comprising, when tantalum oxide is said valve metal oxide, an oxide selected from the oxides of tungsten, molybdenum, antimony, and tin; 3. at least one of the oxides stable in an electrolysis medium selected from the oxides of barium, gallium, germanium, lead, bismuth, selenium, tellurium, copper, cadmium, the rare earth elements, manganese, iron, cobalt, and nickel; wherein the proportion of said doping material in said valve metal oxides is less than about 28 mol percent of the mixture and the proportion of said stable oxides in said cover layer is greater than about 50 mol percent.