METHOD OF PHOSPHATE TREATING METAL SURFACES

In a process for phosphating metal surfaces, phosphating solutions are used which are substantially free of nickel and which contain 0.3 to 1.7 g/l of Zn 0.2 to 4.0 g/l of Mn 0.001 to 0.030, preferably 0.003 to 0.020 g/l of Cu 5 to 30 g/l of phosphate (calculated as P2O5) and in which the concentrat...

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Bibliographische Detailangaben
Hauptverfasser:	GEHMECKER HORST, SCHUBACH PETER, RAUSCH WERNER
Format:	Patent
Sprache:	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:	In a process for phosphating metal surfaces, phosphating solutions are used which are substantially free of nickel and which contain 0.3 to 1.7 g/l of Zn 0.2 to 4.0 g/l of Mn 0.001 to 0.030, preferably 0.003 to 0.020 g/l of Cu 5 to 30 g/l of phosphate (calculated as P2O5) and in which the concentration of Fe(II) is kept below 0.1 g/l by means of oxygen and/or other equivalent oxidising agents and the pH is adjusted to 3.0 to 3.8. The Cu:P2O5 weight ratio is preferably adjusted to 1:(170 to 30,000) and replenishment of Cu and P2O5 is carried out in a weight ratio of 1:(5 to 2000). When used in the spray process, the phosphating solutions should contain 0.3 to 1.0 g/l of Zn and, when used in the spray/dipping process and the dipping process, 0.9 to 1.7 g/l of Zn. The process is used especially for pretreating metal surfaces for subsequent coating, especially electrodipping coating, and phosphating of steel, galvanised steel, alloy-galvanised steel, aluminium and alloys thereof.