AQUEOUS POST TREATMENT COMPOSITION AND METHOD FOR CORROSION PROTECTION

The present invention is related to an aqueous post treatment composition for providing a post treatment layer on at least a part of a passivation layer, which is covering at least a part of a zinc layer being on at least a part of an iron containing substrate, characterized in that the aqueous post...

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Bibliographische Detailangaben
Hauptverfasser:	LENZ, Martin, AMELL TOSAS, Anna, KRÜGER, Mike, STRITTER, Dennis, KARAPINAR, Ercan
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPARATUS THEREFOR CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY IONIMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL ELECTROFORMING ELECTROLYTIC OR ELECTROPHORETIC PROCESSES INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTIONOF COATINGS SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	The present invention is related to an aqueous post treatment composition for providing a post treatment layer on at least a part of a passivation layer, which is covering at least a part of a zinc layer being on at least a part of an iron containing substrate, characterized in that the aqueous post treatment composition comprises at least one chromium (III) ion source and at least one compound containing the chemical element silicon; wherein a molar ratio of silicon versus chromium is given in said composition, with the proviso that said molar ratio is ranging from 2600:1 to 1 : 1 for the zinc layer obtained by an electrolytic acid zinc deposition process; or that said molar ratio is ranging from 5200:1 to 1:1 for the zinc layer obtained by an electrolytic alkaline zinc deposition process. La présente invention concerne une composition aqueuse de post-traitement pour former une couche de post-traitement sur au moins une partie d'une couche de passivation, qui recouvre au moins une partie d'une couche de zinc sur au moins une partie d'un substrat contenant du fer, caractérisée en ce que la composition aqueuse de post-traitement comprend au moins une source d'ions chrome (III) et au moins un composé contenant l'élément chimique silicium ; un rapport molaire du silicium au chrome étant donné dans ladite composition, à condition que ledit rapport molaire soit compris entre 2600:1 et 1:1 pour la couche de zinc obtenue par un procédé de dépôt électrolytique de zinc acide ; ou que ledit rapport molaire soit dans la plage de 5200:1 à 1:1 pour la couche de zinc obtenue par un procédé de dépôt électrolytique de zinc alcalin.