CHROMATE-FREE CONVERSION LAYER AND PROCESS FOR PRODUCING THESAME

A chromate-free, chromic and substantially coherent conversion layer based o n zinc or zinc alloys offers a protection against corrosion from about 100 to 1000 h, as proven by the salt spray test of DIN 50021 SS o r ASTM B 117-73 to first corrosion as described by DIN 50961, chapter 10, even when it...

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Bibliographische Detailangaben
Hauptverfasser:	HULSER, PETER, JANSEN, ROLF, PREIKSCHAT, PATRICIA
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL 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 PERFORMING OPERATIONS PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THESURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION TRANSPORTING
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Beschreibung
Zusammenfassung:	A chromate-free, chromic and substantially coherent conversion layer based o n zinc or zinc alloys offers a protection against corrosion from about 100 to 1000 h, as proven by the salt spray test of DIN 50021 SS o r ASTM B 117-73 to first corrosion as described by DIN 50961, chapter 10, even when it does not contain other components such as silicate, Cer, aluminium and borate. This conversion layer is clear, transparent, substantially colourless and iridescent, is about 100 nm to 1000 nm thick, hard, adheres well and is stable against wiping.