Method for coating metal bodies with a phosphating solution and phosphating solution
Abstract
The invention relates to a method for coating surfaces of metal objects, especially as a pre-treatment for cold deformation or as a pre-treatment for a metal-rubber compound or to adjust friction coefficients in connection elements, used in connection elements such as screws for screwing purposes. The invention is characterised in that the optionally, already pre-coated metal objects are coated with a composition containing an aqueous, acidic phosphate, said composition containing 8-50 g/L phosphate as PO 4 , 0.5-30 g/L zinc ions, 0-5 g/L manganese ions, 0-8 g/L calcium ions, 0-5 g/L magnesium ions, whereby at least 0.1 g/L of calcium or/and magnesium ions are provided, 0.1-5 g/L nitroguanidine, 0.1-8 g/L chlorate or/and peroxide ions and 0-16 g/L complex fluoride (MeF 4 or/and MeF 6 ) of Me=B, Si, Ti, Hf or/and Zr and 0-5 g/L fluoride ions, whereby the total amount of complex fluoride and fluoride ions ranges from 0.1-18 g/L. The invention also relates to a phosphating method wherein the ratio of removal by pickling in relation to the layer weight of the phosphate layer is less than 75%. The invention further relates to a corresponding aqueous phosphating solution.
Claims
exact text as granted — not AI-modified1 . A process comprising coating a surface of a metallic object with an aqueous, acidic composition comprising:
8 to 50 g/l
of phosphate, calculated as PO 4 ,
0.5 to 30 g/l
of zinc ions,
0 to 5 g/l
of manganese ions,
0 to 8 g/l
of calcium ions,
0 to 5 g/l
of magnesium ions,
wherein at least 0.1 g/l of calcium or/and magnesium ions are present,
0.1 to 5 g/l
of nitroguanidine,
0.1 to 10 g/l
in total of chlorate or/and peroxide ions,
in total 0 to 16 g/l of complex fluoride (MeF 4 or/and MeF 6 ) of Me=B, Si, Ti, Hf or/and Zr and
0 to 5 g/l
of fluoride ions
wherein the total content of complex fluoride and fluoride ions is it the range from 0.1 to 18 g/l and wherein the ratio of free acid to total acid is from 0.25:1 to 0.11 to 1.
2 - 16 . (canceled)
17 . A process according to claim 1 , wherein the composition comprises not more than 1 g/l of nitrate.
18 . A process according to claim 1 , wherein the composition comprises not more than 0.5 g/l of nitrite.
19 . A process according to claim 1 , wherein the composition comprises complex fluoride or/and fluoride ions to magnesium ions in a ratio of (MeF 4 , MeF 6 or/and F):Mg in the range from 0.1:1 to 10:1.
20 . A process according to claim 1 , wherein the composition comprises complex fluoride or/and fluoride ions to calcium ions in a ratio of (MeF 4 , MeF 6 or/and F):Ca in the range from 0.1:1 to 10:1.
21 . A process according to claim 1 , wherein the composition further comprises up to 2 g/l nickel ions.
22 . A process according to claim 1 , wherein the composition comprises chloride ions in the range up to 5 g/l.
23 . A process according to claim 1 , wherein the composition fierier comprises up to 2 g/A sulfate ions.
24 . A process according to claim 1 , wherein the composition comprises fluoroborate.
25 . A process according to claim 24 , wherein the composition comprises from 0.1 to 5 g/l BF 4 .
26 . A process according to claim 24 , wherein the composition comprises from 0.2 to 3 g/l BF 4 .
27 . A process according to claim 1 , wherein the pH of the composition is maintained in the range from 0.1 to 4.
28 . A process according to claim 1 , wherein a phosphate layer which has a layer thickness in the range from 0.02 to 15 μm or/and a layer weight in the range from 0.5 to 25 g/m 2 is formed on said surface.
29 . A process according to claim 1 , wherein a phosphate layer which has an average edge length of the phosphate crystals of less than 20 μm or even of less than 10 μm and at the same time has a layer thickness with a layer weight in the range of 1.5 to 18 g/m 2 is formed on the surface.
30 . A process according to claim 29 , wherein the layer weight is from 2 to 15 g/m 2 .
31 . A process according to claim 1 , wherein after the formation of the phosphate layer at least one layer comprising lubricant is applied.
32 . A process for coating surfaces of metallic objects with a phosphating solution, wherein the ratio of the pickling erosion on the metallic surface, measured in g/m 2 , to the layer weight of the phosphate layer, measured in g/m 2 , lies at values below 75% and wherein the ratio of free acid to total acid of said solution is from 0.25:1 to 0.11 to 1.
33 . An aqueous phosphating solution comprising:
8 to 100 g/l
of phosphate, calculated as PO 4 ,
0.5 to 60 g/l
of zinc ions,
0 to 10 g/l
of manganese ions,
0 to 16 g/l
of calcium ions,
0 to 10 g/l
of magnesium ions,
wherein at least 0.1 g/l of calcium or/and magnesium ions are present,
0.05 to 10 g/l
of nitroguanidine,
0 to 2 g/l
of nitrate,
0.1 to 10 g/l
in total of chlorate or/and peroxide ions,
in total 0 to 16 g/l of complex fluoride (MeF4 or/and MeF6) of Me=B, Si, Ti, Hf or/and Zr and
0 to 5 g/l
of fluoride ions
wherein the total content of complex fluoride and fluoride ions is in the range from 0.1 to 18 g/l and wherein the ratio of free acid to total acid is from 0.25:1 to 0.11 to 1.
34 . A metallic object coated produced by the process of claim 1.Join the waitlist — get patent alerts
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