Process for forming phosphate coatings

In a process for forming phosphate coatings on metal surfaces of iron or steel by means of aqueous phosphating solutions based on magnesium phosphate, solutions are used which contain 0.2 to 4 g/l of magnesium, 1 to 20 g/l of phosphate (calculated as P2O5) and, as accelerator, a peroxide compound, i...

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Bibliographische Detailangaben
Hauptverfasser:	FLEISCHHACKER-JEWORREK, HAUFFE, DIETER
Format:	Patent
Sprache:	eng ; fre ; ger
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:	In a process for forming phosphate coatings on metal surfaces of iron or steel by means of aqueous phosphating solutions based on magnesium phosphate, solutions are used which contain 0.2 to 4 g/l of magnesium, 1 to 20 g/l of phosphate (calculated as P2O5) and, as accelerator, a peroxide compound, in particular H2O2, and are free of those inorganic substances which cannot be precipitated with calcium hydroxide in the neutral or alkaline range. Preferably, phosphating solutions are used which additionally contain activators which can be precipitated by calcium hydroxide in the neutral or alkaline range.