Method for oxalating the galvanized surface of sheet metal

Details Method for oxalating the galvanized surface of sheet metal Method for oxalating the galvanized surface of sheet metal

C - Chemistry, Metallurgy

23

C

C23C 22/46 (2006.01)

Patent

CA 2397660

A method for forming a zinc oxalate coating on the surface of a strip or sheet of metal covered with a zinc or zinc alloy coating other than zinc/iron coatings, with the aid of an aqueous solution consisting of oxalic acid having a concentration of between 5.10<-3> and 0.1 mole/l, and at least one compound and/or ion of an oxidant zinc metal having a concentration of between 10<-6> and 10<-2> mole/l, and possibly a wetting agent. The inventive method enables sheet metal to be treated at very high speeds without using large amounts of oxidant. It facilitates management of treatment baths. The invention can be used in the lubrication of sheet metal, especially for die stamping.

Procédé pour former une couche d'oxalate de zinc sur la surface d'une bande ou d'une tôle métallique revêtue d'une couche de zinc ou d'alliage de zinc, à l'exception des alliages zinc-fer, au moyen d'une solution aqueuse constituée d'acide oxalique à une concentration comprise entre 5.10-3 et 0,1 mole/l, et d'au moins un composé et/ou un ion d'un métal oxydant du zinc à une concentration comprise entre 10 -6 et 10 -2 mole/l, et éventuellement un agent mouillant. Ce procédé permet de traiter les tôles à des vitesses très élevées, sans utiliser d'oxydant en quantité importante; il facilite la gestion des bains de traitement. Utilisation de ce procédé pour la lubrification de tôle, notamment en vue de l'emboutissage.

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