PHOSPHONATE-FREE, AQUEOUS PICKLING COMPOSITIONS AND THEIR USE

The invention relates to a phosphonate-free, aqueous pickling composition having a pH value at 55 °C in the range from 5 to 9, and containing at least one copolymer, which is water-soluble or water-dispersible and selected from the group consisting of polyvinylpyrrolidones; the content of water bein...

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Bibliographische Detailangaben
Hauptverfasser:	MOHR, Anna, KHELFALLAH, Nawel, SIX, Marcell
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	CHEMICAL SURFACE TREATMENT CHEMISTRY CLEANING OR DEGREASING OF METALLIC MATERIAL BY CHEMICALMETHODS OTHER THAN ELECTROLYSIS 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 invention relates to a phosphonate-free, aqueous pickling composition having a pH value at 55 °C in the range from 5 to 9, and containing at least one copolymer, which is water-soluble or water-dispersible and selected from the group consisting of polyvinylpyrrolidones; the content of water being in the range from 95.0 wt.-% to 99.9 wt.-% based on the total weight of the composition. The invention further relates to a concentrate to produce such compositions, a pickling method for pickling metallic substrates making use of the compositions, a coating method for coating metallic substrates comprising the pickling method and a use of the compositions for pickling metallic substrates. L'invention concerne une composition de décapage aqueuse exempte de phosphonate ayant à 55 °C une valeur de pH dans la plage de 5 à 9, et contenant au moins un copolymère qui est soluble ou dispersible dans l'eau et choisi dans le groupe constitué par les polyvinylpyrrolidones ; la teneur en eau étant dans la plage de 95,0 % en masse à 99,9 % en masse sur la base de la masse totale de la composition. L'invention concerne en outre un concentré destiné à produire de telles compositions, un procédé de décapage visant au décapage de substrats métalliques utilisant les compositions, un procédé de revêtement visant au revêtement de substrats métalliques comprenant le procédé de décapage et une utilisation des compositions visant au décapage de substrats métalliques.