Patent GB-1099434-A (GB)
Title: Electrode for electrolysis
IPC: C25B11/10
Filed: 1965-03-18
Abstract: <PICT:1099434/C6-C7/1> <PICT:1099434/C6-C7/2> <PICT:1099434/C6-C7/3> An electrode for electrolysis comprises a layer of platinum group metal i.e. platinum, iridium, rhodium, palladium or an alloy thereof explosively bonded to one side of a corrosion resistant metal plate and another metal plate explosively bonded to the other side of the corrosion resistant plate.  A thin sheet of platinum group metal is stuck to an iron support plate and supported spaced above a corrosion resistant metal plate of titanium, zirconium or tantalum and the upper surface of the support plate is covered with explosive which is detonated to bond the platinum group metal sheet to the corrosion resistant plate. Alternatively the support plate which may be non-metallic is plated with the platinum group metal before the explosive bonding. A fork like plate 10, Fig. 5 of highly conductive metal is placed on the side of the corrosion resistant plate 2 remote from the platinum group metal sheet 1 and covered with explosive which is detonated to bond the conductive plate to the corrosion resistant plate.  The conductive plate 10 is connected to a terminal 18 and covered with a fork like plate 11 of corrosion resistant metal which forms a space about the plate 10, the plate 11 being welded to the corrosion resistant plate at 19.  Instead of a fork like shape the conductive plate may be rib or leaf like and the whole surface of the corrosion resistant plate may be covered with the plate of corrosion resistant metal.  The space about the conductive plate defined by the corrosion resistant plate 11 may be filled with a low melting point alloy e.g. a solder or may form a passage for cooling or heating water. In a further embodiment five plates each comprising a corrosion resistant metal plate 2 Fig. 9 explosively clad on one surface with a platinum group metal 1 are arranged in spaced parallel relationship and on the other surfaces of the plates 2 at right angles to the axes of the plates a corrosion resistant metal plate 22 is explosively bonded.  A conductive plate 10 is then explosively bonded to the metal plate 22. The plate 10 may have a U-shaped section.  A U section plate 11 of corrosion resistant metal is welded over the plate 10 to form a space which may be filled with a low melting point alloy or used for a hot or cold water passage.  In another embodiment a large number of rectangular plates each formed by explosively bonding a platinum group metal on to one surface of a corrosion resistant plate are arranged in spaced parallel relationship and on the other surfaces of the corrosion resistant plates at right angles to the axes of the rectangular plates are placed two parallel spaced corrosion resistant metal plates 22 Fig. 12 which are explosively bonded to the other surface.  Conductive metal plates 10 are then explosively bonded to the plates 22 and these conductive metal plates are then covered with rectangular section members 11 of corrosion resistant metal filled with low melting point alloy. A cover member 12 of rectangular cross-section filled with low melting alloy connects the plates 11 and to the central portion of this member 12 is fixed a cylinder 14 in which a copper terminal bar is secured by low melting alloy.