Process for facilitating cold-working operations
AssigneeMetallgesellschaft Aktiengesellschaft
InventorsKlaus-Dieter Nittel, Karl-Heinz Zander
Life of this patent
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Abstract
In a process for facilitating non-cutting cold working of ferrous materials by application of a phosphate coating, ferrous materials are dipped into a phosphating solution which is free of elements of group VIB of the periodic table which consists of Cr, Mo and W, of nitrogen compounds and preferably also free of nickel and contains 5 to 20 g/l zinc 1 to 15 g/l magnesium 10 to 26 g/l phosphate calculated as P.sub.2 O.sub.5 1 to 15 g/l fluoroborate calculated as BF.sub.4 1 to 7 g/l chlorate calculated as ClO.sub.3 and in which the weight ratio of Zn:Mg:BF.sub.4 is adjusted to from 1:0.15:0.15 to 1:1:1.
Claims11
A process for facilitating non-cutting cold working of a ferrous material, said process comprising the step of applying to said ferrous material an aqueous acid phosphating solution by dipping to form a phosphate coating on said ferrous material, wherein said aqueous acid phosphating solution contains oxidizing agents, is virtually free of Fe(II) ions, is free of elements of group VIB of the periodic system, said group VIB consisting of Cr, Mo and W, is free of nitrogen compounds and contains
- 5 to 20 g/l zinc
- 1 to 15 g/l magnesium
- 10 to 26 g/l phosphate calculated as P.sub.2 O.sub.5
- 1 to 15 g/l fluoroborate calculated as BF.sub.4
- 1 to 7 g/l chlorate calculated as ClO.sub.3
- and in which a weight ratio of Zn:Mg:BF.sub.4 is from 1:0.15:0.15 to 1:1:1.
Dependencies are inferred from the claim text.