Patent ID: 7425257
Filing Date: 2008-09-16
Classification: C25C

Abstract:
1. A method for the formation of a contact surface having good electrical conductivity on a support bar of an aluminum cathode used in electrolysis comprising: i) attaching a copper contact piece onto the end of the support bar; ii) forming a transmission layer on an area of the contact surface; and iii) coating the contact surface with a silver or silver alloy having a thickness of 0.5-2 mm by using a soldering or thermal spraying technique, wherein the support bar of an aluminum cathode used in electrolysis is for immersing the cathode plate in an electrolysis cell and supporting the support bar by its ends one the sides of the electrolysis cell so that the contact piece is located on top of a busbar, the lower surface of the contact piece touching the electrolysis cell busbar forming a contact surface, and the transmission layer and the coating form a metallurgical joint with the copper contact piece.