TITANIUM OR TANTALUM BASE ELECTRODES WITH APPLIED TITANIUM OR TANTALUM OXIDE FACE ACTIVATED WITH NOBLE METALS OR NOBLE METAL OXIDES

• US 3,616,445 A
• Filed: 12/14/1967
• Issued: 10/26/1971
• Est. Priority Date: 12/14/1967
• Status: Expired due to Term

• Current Assignee: Electrode Corporation
• Original Assignee: Antonio Nidola, Giuseppe Bianchi, Patrizio Gallone, Vittorio Denora
• Inventors: Bianchi, Giuseppe, Gallone, Patrizio, Nidola, Antonio, DeNora, Vittorio
• Primary Examiner(s): Tung, T.
• Application Number:
  US04/690,407
• Time in Patent Office: 1,412 Days
• Field of Search: 204/29F,98,99
• US Class Current: 204/290.08
• CPC Class Codes: C25B 1/46 in diaphragm cells
• CPC Class Codes: C25B 11/04 characterised by the material
• CPC Class Codes: C25B 11/061 Metal or alloy
• CPC Class Codes: C25B 11/093 at least one noble metal or noble metal oxide and at least one non-noble metal oxide

Abstract

Describes a titanium or tantalum base electrode having a protective and electrocatalytic layer applied to the faces exposed to the electrolyte, said protective and electrocatalytic layer consisting of mixtures of solid solutions of valve metal oxides and platinum group and noble metals as such or in the form of oxides and/or oxyhalides.

Claims

2. The electrode of claim 1 in which the minor portion contains iridium and the iridium is in substantially equal amounts with the metal in the ruthenium oxide.

3. As a product of manufacture, a titanium base electrode in mesh form having a titanium oxide coating with a mixture of ruthenium oxide and one metal from the group consisting of iridium and gold extending through the coating and capable of conducting current from the titanium base through said coating to the exposed surface of said coating, said coating being formed on said base from a solution containing a titanium and a ruthenium compound and a compound from the group consisting of an iridium compound and a gold compound and baked on said base.

4. The product of claim 3 in which the metal in the ruthenium oxide and the metal compound from the group consisting of iridium and gold constitute from about 20 to about 85 percent of the weight of the metal in the titanium oxide.

5. The product of claim 3 in which the metal is iridium, said metal and the metal in the ruthenium oxide are in approximately equal amounts and constitute from about 20 to about 85 percent of the weight of the metal in the titanium oxide coating.

6. The product of claim 3 in which the coating is on all sides of the titanium base electrode.

7. The product of claim 3 in which the coating is applied in a plurality of layers and the electrode is heated in an oxidizing atmosphere after each layer is applied.

8. As a product of manufacture, an electrode consisting of a core of solid massive substantially nonporous valve metal from the group consisting of titanium and tantalum in mesh form, a substantially nonporous oxide layer of the same metal on said core in mixture with ruthenium oxide and a metal from the group consisting of iridium and gold, said layer being formed by applying a solution containing a compound from the group consisting of a titanium compound and a tantalum compound, a ruthenium compound and a compound selected from the group consisting of an iridium compound and a gold compound onto said core and baking on said core.

9. The product of claim 8 in which the oxide from the group consisting of titanium and tantalum oxides, the ruthenium oxide and the metal from the group consisting of iridium and gold are mixed together as chloride and applied to the core and baked on the core under air circulation.

10. As a product of manufacture, an electrode comprising a core of titanium and a conducting cover coating over said core consisting of (a) titanium oxide, (b) ruthenium oxide and (c) a metal from the group consisting of iridium and gold, said coating being formed by applying a solution containing a titanium compound, a ruthenium compound and a compound from the group consisting of an iridium compound and a gold compound onto said core and baking thereon, said coating being in multiple layers on said core and the metal in the titanium compound constituting more than 50 percent of the weight of the metals in said coating.