Patent EA-004488-B1 (EA)
Title: Method for manufacturing an electrode and an electrode
Inventor: POLVI VEIKKO
IPC: C25C7/02
Filed: 2001-02-21
Abstract: 1. A method for manufacturing an electrode used in the electrolysis of metals, in which method the plate element (2) of an electrode is attached to a suspension bar (1), which also serves as a power conductor, characterized in that said plate element (2) made of refined steel is attached to the suspension bar (1) made of copper or copper alloy by means of a diffusion joint, wherein between the junction surfaces of the plate element (2) and the suspension bar (1) prior to creating the joint, there is arranged at least one intermediate layer (3) which consists mainly of nickel (Ni) or chromium (Cr) or of an alloy or mixture thereof. 2. A method according to claim 1, characterized in that the plate element (2) is attached to the suspension bar (1) at its top part, at least along its essential length. 3. A method according to any of the claims 1-2, characterized in that in between the junction surfaces of the plate element and the suspension bar to be joined together, there is arranged a first intermediate layer (3) on the junction surface of the plate element (2) or against said surface, and a second intermediate layer (4) on the junction surface of the suspension bar (1) or against said surface, whereafter the junction surfaces including their intermediate layers are pressed together, and in which method at least the junction area is heated. 4. A method according to any of the claims1-3, characterized in that the second intermediate layer (4) consists of an activator with a melting temperature that is lower than the melting temperature of the objects to be joined together. 5. A method according to any of the claims 1-4, characterized in that the second intermediate layer (4) consists mainly of silver (Ag) and/or tin (Sn), or as an alloy or in a mixture, silver and copper (Ag+Cu), aluminum and copper(Al+Cu) or tin and copper (Sn+Cu). 6. An electrode to be used in the electrolytic plants of metals, said electrode comprising a suspension bar (1) and a plate element (2) attached to said suspension bar, characterized in that said plate element (2) is attached to said suspension bar (1) by means of a diffusion joint, characterized in that said plate element (2) is attached to said suspension bar (1) by means of a diffusion joint, there is arranged at least one intermediate layer (3) along the junction surface of the plate element (2) and the suspension bar (1) which consists mainly of nickel (Ni) or chromium (Cr) or of an alloy or mixture thereof, wherein the surface of the suspension bar (1) surrounding the plate element made mainly of copper or copper alloy and the plate element (2) is made of refined steel, particularly acid-proof steel. 7. And electrode according to claim 6, characterized in that the plate element (2) is attached to the suspension bar (1) essentially along the whole length of said plate element (2). 8. And electrode according to any of the claims 6 or 7, characterized in that the suspension bar (1) is provided with a groove (6) or the like, in which the counterpart of the plate element is arranged to be fitted in. 9. And electrode according to any of the claims 6-8, characterized in that the suspension bar (1) is attached on both sides of the plate element (2). 10. And electrode according to any of the claims 6-9, characterized in that said electrode is a permanent cathode.