Non chromate colored conversion coating for aluminum

The present invention relates to a process for the formation of colored conversion coatings on aluminum substrates using an acidic aqueous composition comprising chromium(III), the elements Mo and/or W, a source of fluoride, and at least one oxidizing agent having a standard reduction potential in a...

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Bibliographische Detailangaben
Hauptverfasser:	PIERLUIGI, CERIOLI, LUDOVICO, PALLADINI, ANDREA, SOLDATI, LORENZO, D'ERCHIA, MATHIEU, VAN DE CAPPELLE
Format:	Patent
Sprache:	chi ; eng
Schlagworte:	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 INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION
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Beschreibung
Zusammenfassung:	The present invention relates to a process for the formation of colored conversion coatings on aluminum substrates using an acidic aqueous composition comprising chromium(III), the elements Mo and/or W, a source of fluoride, and at least one oxidizing agent having a standard reduction potential in a range from +1.0 to +1.8V (SHE). The invention further relates to an acidic aqueous composition that can be used in such a process and its use.