Method of providing electric current taker for support bar,...

C - Chemistry – Metallurgy – 25 – C

Patent

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Details

C25C 7/02 (2006.01)

Patent

CA 2729797

The invention relates to a method of providing an electric current taker (6a, 6b) made from silver and having a highly electro conductive contact surface into an aluminium support bar (1) to be used in electrolysis. In order for the support bar (1) and the electric current taker (6a, 6b) there into be easily, quickly and inexpensively manufactured,the method comprises a) heating a first end (2) of the support bar (1) and providing on top of it a solder containing a substance whose affinity to oxygen is high after a temperature of an aluminium surface is at a temperature which exceeds a melting temperature of the solder, whereby the solder is spread in a molten state on top of the surface, 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, the electric current taker (6a, 6b) and letting the solder to solidify and the electric current taker to become attached to the solidified solder. The invention further relates to a support bar (1).

Linvention concerne un procédé de fourniture dun préleveur de courant électrique (6a, 6b) constitué dargent et comportant une surface de contact hautement électroconductrice dans une barre de support daluminium (1) à utiliser en électrolyse. Afin que la barre de support (1) et le préleveur de courant électrique (6a, 6b) à lintérieur soient fabriqués facilement, rapidement et de façon peu coûteuse, le procédé comprend a) le chauffage de la première extrémité (2) de la barre du support (1) et la fourniture à son sommet dune brasure tendre comprenant une substance dont laffinité à loxygène est élevée après quune température dune surface daluminium dépasse une température de fusion de la brasure tendre, ce qui permet détaler la brasure tendre dans un état fondu au sommet de la surface, b) la rupture dune couche doxyde daluminium entre laluminium et la brasure tendre fondue par un traitement mécanique de sorte que loxygène soit libéré de la couche doxyde daluminium, loxygène réagissant avec la substance de la brasure tendre ayant une haute affinité pour loxygène et la formation, conjointement avec la substance, sur la surface de la brasure tendre fondue dune couche doxyde, et c) la fourniture, au sommet de la brasure tendre, du préleveur de courant électrique (6a, 6b) et le fait de laisser la brasure tendre se solidifier et le préleveur de courant électrique sattacher à la brasure tendre solidifiée. Linvention concerne en outre une barre de support (1).

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