Abstract: A process for the production of an open metal mesh the surfaces of which are coated with a coating of an electrocatalytically-active material, the process comprising forming a plurality of slits in a sheet of metal, applying a coating of an electrocatalytically-active material to the slit sheet, and stretching the coated sheet to expand the sheet and form the open mesh. The mesh is suitable for use as an anode in cathodic protection of steel-containing structures, for example, steel-reinforced concrete structures.

Abstract: An electrolytic process in which an aqueous electrolyte is electrolysed in an electrolytic cell which comprises at least one anode and at least one cathode, in which oxygen is evolved at the anode, and which is operated at an anode current density of at least 3kA/m.sup.2, in which the anode comprises a substrate having at least in part an outer surface of tantalum, or of an alloy thereof, at least part of the tantalum or tantalum alloy substrate having a coating of an electrocatalytically-active material.The anode may be a tantalum-clad titanium substrate, and the process may be, for example, an electrogalvanizing or electrotinning process.

Abstract: A titanium or niobium electrode substrate (which may be copper or steel cored) having on its surface a painted and fired anodically active layer for example of a platinum group metal, there being an interlayer of tantalum or an alloy containing more than 50% tantalum in metallic form between the anodically active layer and the substrate. The tantalum metal gives enhanced corrosion resistance and acid undermining resistance to titanium substrates and eases the manufacture of painted and fired niobium substrate electrodes.The electrode may be an elongate rod having longitudinally extending protuberances along the length of the rod and around the circumference, the spacing and height of the protuberances being such that a straight line connecting the peaks of two adjacent protuberances does not intersect with the body of the electrode so that the protuberances protect the anodically active coating from damage during installation and operation of the electrode.

Abstract: An electrode particularly useful in hypochlorite cells operating at low temperatures or in metal winning cells in which the electrode comprises a titanium substrate with a platinum metal coating and an intermediate coating of substoichiometric tantalum oxide.

Abstract: The invention provides an electrode material, and a method for its manufacture, for use in electrochemical reactions comprising bulk titanium oxide having the general formula TiO.sub.x where x is from 1.55 to 1.95 and also electrochemical cells including an electrode formed from such a material.

Abstract: A method of carrying out an electrolytic process utilizing an electrode formed of a film-forming metal having applied thereto coatings of a precious metal compound capable of decomposing upon heating, said compound being decomposed by heating, and a further layer of precious metal electroplated on to said fired compound layer.