Claims
- 1. A phosphating composition for zinc-, iron-, or zinc-iron-phosphate conversion coatings, excluding nitrite as an accelerator, and containing an accelerator which is one of the following compounds, its alkali metal salt or ammonium salt, or any mixture thereof: ##STR5## wherein: R.sup.1 is
- (i) a C.sub.1-4 linear or branched alkyl radical,
- (ii) a C.sub.5-6 saturated carbocyclic or heterocyclic radical, or
- (iii) an aryl or aralkyl radical having at least 6 members; and
- R.sup.2 is
- (i) hydroxy,
- (ii) --O.sup.- M.sup.+ in which N.sup.+ is an alkali metal or an ammonium ion, of
- (iii) an aromatic ring having at least 6 members, optionally substituted by a hydroxy, amino, (C.sub.1-3 alkyl)--CO--NH or (carboxy C.sub.1-3 alkyl)--CO--NH radical; ##STR6## wherein, R.sup.3 is
- (i) hydrogen,
- (ii) hydroxy, or
- (iii) anamino radical; ##STR7## wherein: R.sup.4 is
- (i) hydrogen, or
- (ii) a C.sub.1-4 linear or branched alkyl radical and
- M.sup.+ is an alkali metal or an ammonium ion.
- 2. The composition of claim 1 wherein said compounds are, N-cyclohexyl sulfamic acid or salts thereof, benzoic acid sulfimide, sulfanilide, 1,2,3-oxathiazin-4-(3H)-one salts or 6-alkyl derivatives thereof.
- 3. The composition of claim 1 wherein said compounds are N-cyclohexyl sulfamic acid or salts thereof, benzoic acid sulfimide, sulfanilide, 1,2,3-oxathiazin-4-(3H)-one potassium or 6-alkyl derivatives thereof.
- 4. The composition of claim 1 wherein said accelerator is:
- (a) amidosulfonic acid and N-cyclohexyl sulfamic acid
- (b) amidosulfonic acid and N-cyclohexyl sulfamic acid sodium salt,
- (c) benzene sulfanilide,
- (d) N-cyclohexyl sulfamic acid,
- (e) benzoic acid sulfimide,
- (f) N-cyclohexyl sulfamic acid sodium salt and m-nitrobenzene sulfonic acid sodium salt,
- (g) 1,2,3-oxathiazin-4(3H)-one potassium salt
- (h) N-cyclohexyl sulfamic acid sodium salt.
- 5. The composition of claim 1 wherein said accelerator composition is the N-substitution product of amidosulfonic acid, its salt, or a mixture thereof; a chlorate is present as an auxiliary accelerator; and the weight ratio of accelerator composition to auxiliary accelerator is about 0.1-10.0:1.
- 6. The composition of claim 1 wherein said accelerator composition is sulfonamide; a chlorate is present as an auxiliary accelerator; and the weight ratio of accelerator composition to auxiliary accelerator is about 0.1-10.0:1.
- 7. The composition of claim 1 wherein said accelerator composition is aminosulfonic acid, its N-substitution product, its salt, or a mixture thereof; a molybdate is present as an auxiliary accelerator; and the weight ratio of accelerator composition to auxiliary accelerator is 10-100:1.
- 8. The composition of claim 1 wherein said accelerator composition is 6-methyl-1,2,3-oxathiazin-4(3H)-one potassium salt.
- 9. The composition of claim 1 wherein R.sup.2 is (ii) or (iii).
- 10. In a process for the accelerated and layer-refining application of phosphate coatings to metal surfaces using phosphating solutions based on zinc phosphate and/or iron phosphate and/or zinc-iron phosphate as the principal layer-forming component, in admixture with an accelerator, excluding nitrite the improvement comprising using as the accelerator a composition consisting essentially of one of the following compounds, its alkali metal salt or ammonium salt, or any mixture thereof: ##STR8## wherein: R.sup.1 is,
- (i) a C.sub.1-4 linear or branched alkyl radical,
- (ii) a C.sub.5-6 saturated carbocyclic or heterocyclic radical, or
- (iii) an aryl or aralkyl radical having at least 6 members; and
- R.sup.2 is
- (i) hydroxy,
- (ii) --O.sup.- M.sup.+ in which M.sup.+ is an alkali metal or an ammonium ion, or
- (iii) an aromatic ring having at least 6 members, optionally substituted by a hydroxy, amino, (C.sub.1-3 alkyl)--CO--NH or (carboxy C.sub.1-3 alkyl)--CO--NH radical; ##STR9## wherein: R.sup.3 is
- (i) hydrogen,
- (ii) hydroxy, or
- (iii) an amino radical; ##STR10## wherein: R.sup.4 is
- (i) hydrogen, or
- (ii) a C.sub.1-4 linear or branched alkyl radical, and
- M.sup.+ is an alkali metal or an ammonium ion.
- 11. The process of claim 10 wherein said accelerator is present in said phosphating solution in an amount effective to accelerate deposition of a phosphate coating at a given solution temperature.
- 12. The process of claim 11 wherein said accelerator is present in from about 0.1 to 6 grams per liter of phosphating solution.
- 13. The process of claim 12 wherein said accelerator composition is the N-substitution product of amidosulfonic acid, its salt, or a mixture thereof.
- 14. The process of claim 13 wherein a chlorate is present as an auxiliary accelerator.
- 15. The process of claim 14 wherein the weight ratio of accelerator composition to auxiliary accelerator is about 0.1-10.0:1.
- 16. The process of claim 12 wherein said accelerator composition is a sulfonamide.
- 17. The process of claim 16 wherein a chlorate is present as an auxiliary accelerator.
- 18. The process of claim 17 wherein the weight ratio of accelerator composition to auxiliary accelerator is about 0.1-10.0:1.
- 19. The process of claim 12 wherein said accelerator is aminosulfonic acid, its N-substitution product, its salt, or a mixture thereof.
- 20. The process of claim 19 wherein a molybdate is present as an auxiliary accelerator.
- 21. The process of claim 20 wherein the weight ratio of accelerator composition to auxiliary accelerator is 10-100:1.
- 22. The process of claim 12 wherein said accelerator is 6-methyl-1,2,3-oxathiazin-4(3H)-one potassium salt.
- 23. The process of claim 10 wherein R.sup.2 is (ii) or (iii).
- 24. The process of claim 10 wherein said phosphating solution additionally contains at least one of
- (a) from about 0.3 to 5.0 grams per liter of a mixture of nonionic surfactants,
- (b) from about 0.1 to 5.0 grams per liter of simple fluorides, complex fluorides, or their mixture, and
- (c) Ni.sup.- ions, Co.sup.- ions, Fe.sup.- ions, or their mixture.
- 25. The process of claim 24 wherein the total amount of said phosphating solution additional constituents is about 0.1 to 4.5 grams per liter.
- 26. The process of claim 10 wherein the pH of said phosphating solution is about 1.8 to 5.8.
- 27. The process of claim 10 wherein the pH of said phosphating solution is about 2.0 to 3.5.
- 28. The process of claim 10 wherein the temperature of said phosphating solution at the time of treatment is about 25 to 70.degree. C.
- 29. The process of claim 10 wherein the temperature of said phosphating solution at the time of treatment is about 45.degree. to 60.degree. C.
- 30. The process of claim 10 wherein the treatment time with said phosphating solution is about 20 to 300 seconds.
- 31. The process of claim 10 wherein the treatment time with said phosphating solution is about 30 to 180 seconds.
- 32. The process of claim 10 wherein the pH of said phosphating solution is about 2.0 to 3.5; the temperature of said phosphating solution at the time of treatment is about 45.degree. to 60.degree. C.; and the treatment time with said phosphating solution is about 30 to 180 seconds.
- 33. The process of claim 10 wherein said application of phosphate coatings is by immersion, spraying, or a combination thereof.
- 34. The process of claim 10 wherein said compounds are, N-cyclohexyl sulfamic acid or salts thereof, benzoic acid sulfimide; sulfanilide, 1,2,3-oxathiazin-4-(3H)-one salts or 6-alkyl derivatives thereof.
- 35. The process of claim 10 wherein said compounds are, N-cyclohexyl sulfamic acid or salts thereof, benzoic acid sulfimide, sulfanilide, 1,2,3-oxathiazin4-(3H)-one potassium or 6-alkyl derivatives thereof.
- 36. The process of claim 10 wherein said accelerator is:
- (a) amidosulfonic acid and N-cyclohexyl sulfamic acid
- (b) amidosulfonic acid and N-cyclohexyl sulfamic acid sodium salt,
- (c) benzene sulfanilide,
- (d) N-cyclohexyl sulfamic acid,
- (e) benzoic acid sulfimide,
- (f) N-cyclohexyl sulfamic acid sodium salt and m-nitrobenzene sulfonic acid sodium salt,
- (g) 1,2,3-oxathiazin-4(3H)-one potassium salt
- (h) N-cyclohexyl sulfamic acid sodium salt, or
- (i) 3-toluidine-4-sulfonic acid.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3325974 |
Jul 1983 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 631,022, filed 7/16/84 now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (7)
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2241798 |
Mar 1974 |
DEX |
2232067 |
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1360266 |
Jul 1974 |
GBX |
1542222 |
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2074611 |
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SUX |
Continuations (1)
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Number |
Date |
Country |
Parent |
631022 |
Jul 1984 |
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