Patent ID: 8303793
Filing Date: 2012-11-06
Classification: B23K,C22C,C25C

Abstract:
1. A method of providing an electric current taker made from silver or silver-based alloy and having a highly electroconductive contact surface onto a surface of a first end of an aluminium support bar to be used in electrolysis, which support bar via the electric current taker is to be supported against a busbar used in connection with an electrolysis basin, the method comprising the steps of a) heating the first end of the support bar having an aluminium surface and providing the heated aluminium surface with a zinc based solder containing a substance whose affinity to oxygen is high after the aluminium surface is at a temperature which exceeds a melting temperature of the solder, and spreading the solder is in a molten state on top of the surface over a surface area of a desired extent so that the surface is provided with a solder in a molten state, b) breaking an aluminium oxide layer between the aluminium and the molten solder by a mechanical treatment so that oxygen is released from the aluminium oxide layer, the oxygen reacting with the substance of the solder having a high affinity to oxygen and forming, together with the substance, on the surface of the molten solder an oxide layer, and c) providing, on top of the solder residing over the surface area, the electric current taker made from silver or silver-based alloy, and letting the solder to solidify and the electric current taker to become attached in place in the solidified solder.