C - Chemistry – Metallurgy – 23 – C
Patent
C - Chemistry, Metallurgy
23
C
C23C 22/83 (2006.01) C23C 22/18 (2006.01) C23C 22/73 (2006.01) C02F 1/44 (2006.01)
Patent
CA 2400695
The invention relates to a method for carrying out the post-passivation of a phosphatized metal surface. The inventive method is characterized in that the phosphatized metal surface is treated with an aqueous post-passivation solution containing nickel ions provided in an amount of 50 to 500 mg/l and phosphate ions provided in an amount of 200 to 1500 mg/l. Accumulating rinsing water containing constituents of the post-passivation solution can be treated using nanofiltration or reverse osmosis, whereby the retentate is transferred to the phosphatizing bath, thus completing the Ni cycle. In addition, the post- passivation solution preferably contains a phosphatizing accelerator.
L'invention concerne un procédé de post-passivation d'une surface métallique phosphatée, qui se caractérise en ce que la surface métallique phosphatée est traitée avec une solution aqueuse de post-passivation qui contient entre 50 et 500 mg/l d'ions de nickel et entre 200 et 1500 mg/l d'ions de phosphate. L'eau de rinçage qui en résulte et contient des constituants de la solution de post-passivation peut être soumise à un traitement par nanofiltration ou par osmose inverse. Le rétentat est ajouté au bain de phosphatation et le cycle de Ni est ainsi terminé. La solution de post-passivation contient en outre un accélérateur de phosphatation.
Brouwer Jan-Willem
Kuhm Peter
Henkel Kommanditgesellschaft Auf Aktien
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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