Short time hot sealing of anodized metal surfaces with...

C - Chemistry – Metallurgy – 25 – D

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C25D 11/24 (2006.01) C25D 5/48 (2006.01) C25D 11/18 (2006.01)

Patent

CA 2257253

Process for post-sealing anodized metal surfaces, characterized in that the anodized metal is contacted with an aqueous solution for a period of between 0.5 and 2 minutes per micrometer of anodized coating thickness, which solution is at a temperature of between 75°C and its boiling point and has a pH of from 5.5 to 8.5 and which contains: (a) a total of 0.0004 to 0.05 g/l of one or more cationic, anionic or non-ionic surfactants; and (b) a total of 0.0005 to 0.5 g/l of one or more organic acids selected from cyclic polycarboxylic acids having 3 to 6 carboxyl groups and/or phosphonic acids. Non-ionic surfactants are preferred as the surfactants while polyphosphinocarboxylic acids are preferred as the acids. Alkali and/or alkaline earth metalcations, preferably Li and/or Mg ions, are optionally present in quantities of 0.0001 to 5 g/l.

Procédé de post-scellement des surfaces métalliques anodisées, caractérisé par le fait que le métal anodisé est mis en contact, pendant une période variant de 0,5 à 2 minutes par micromètre d'épaisseur de couche anodisée, avec une solution aqueuse dont la température se situe entre 75 degrés C et son point d'ébullition, dont le pH est entre 5,5 et 8,5 et qui contient : a) une concentration totale de 0,0004 à 0,05 g/l d'un ou de plusieurs surfactants cationiques, anioniques ou non ioniques et b) une concentration totale de 0,0005 à 0,5 g/l d'un ou de plusieurs acides organiques choisis parmi les acides polycarboxyliques cycliques ayant de 3 à 6 groupes carboxyles et/ou les acides phosphoniques. Les surfactants préférés sont les surfactants non ioniques, et les acides préférés sont les acides polyphosphinocarboxyliques. Les cations de métaux alcalins ou alcalino-terreux, de préférence les ions Li et/ou Mg, peuvent être présents dans la solution en concentrations variant de 0,0001 à 5 g/l.

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