Short duration heat sealing of anodized metal surfaces

Details Short duration heat sealing of anodized metal surfaces Short duration heat sealing of anodized metal surfaces

C - Chemistry, Metallurgy

25

D

C25D 11/24 (2006.01) C25D 5/48 (2006.01)

Patent

CA 2235476

The process for sealing anodised metal surfaces is characterised in that the anodised metal is brought into contact with an aqueous solution for a duration equivalent to 0.5-2 minutes per micron of anodised layer thickness. The solution has a temperature of between 75 ~C and its boiling point and a pH value of between 5.5 and 8.5. It contains a) between 0.0001 and 5 g/l of one or more alkali metal and/or alkaline earth metal ions, and b) between 0.0005 and 0.5 g/l of one or more organic acids selected from the group comprising cyclic polycarboxylic acids with 3-6 carboxyl groups and/or phosphonic acids and/or polyphosphinocarboxylic acids, there being more metal ions of group a) than is required to ensure complete neutralisation of the group b) acids.

L'invention concerne un procédé de colmatage de surfaces métalliques anodisées, caractérisé en ce que l'on met en contact le métal anodisé pour une durée comprise entre 0,5 et 2 minutes par micromètre d'épaisseur de couche d'anodisation, avec une solution aqueuse présentant une température comprise entre 75 ·C et le point d'ébullition et un pH de l'ordre de 5,5 à 8,5. Ladite solution aqueuse contient a) au total 0,0001 à 5 g/l d'au moins un ion de métal alcalin et/ou de métal alcalinoterreux et b) au total 0,0005 à 0,5 g/l d'au moins un acide organique choisi parmi les acides polycarboxyliques cycliques avec 3 à 6 groupes carboxyle et/ou les acides phosphoniques et/ou les acides polyphosphinocarboxyliques. Ladite solution contient une proportion d'ions métalliques du groupe a) supérieure à la proportion nécessaire à une neutralisation complète des acides du groupe b).

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