Abstract: A coated valve metal electrode for electrochemical processes, which has (a) an electrode base body of valve metal; (b) a base layer on said valve metal, said base layer comprising an electrically conducting element without valve effect, and (c) a cover layer comprising titanium dioxide and/or tantalum oxide with certain doping and stable oxides.

Abstract: The anode is particularly designed for use at anodic densities D.sub.A greater than 10 kA/m.sup.2, and comprises substantially horizontally extending coated anode segments having a clear spacing of at least 1.5 mm from each other and upwardly extending lateral surfaces. Each segment has an active coated part higher than 5 mm and not exceeding 20 mm, measured from the horizontal undersurface of the anode. The actual active surface of the parts, up to heights of 5 mm, 7.5 mm, 10 mm and 15 mm, respectively, exceeds at least 2.5, 3.33, 4 and 4.7 times, respectively, the projected anode area which latter is the total area bounded by the periphery of the anode. At least half the actual active surface extends upwardly relative to the horizontal base area of the anode.

Abstract: Preparation and use of a new electrochemical active substance for the cover layer of metal anodes, which substance is thallium palladate and is obtained as a cardinal-red compound, which is cubic-face-centered, sufficiently characterized in pure crystalline form and, thus, constitutes a new electrochemical active substance for the cover layer of metal anodes.