Claims
- 1. A process for selectively removing nickel-iron alloys from the surface of a ferrous metal substrate which comprises contacting said metal surface with an aqueous bath containing in the absence of any inhibitor to prevent corrosive attack on the substrate:
- a. at least one nitro substituted organic compound containing at least one solubilizing group;
- b. at least one organic amine or polyamine or substituted amine or polyamine;
- c. at least one aliphatic carboxylic acid or salt thereof, or a compound which will yield said carboxylic acid or salt thereof in solution, further characterized in that additionally said aliphatic carboxylic acid or salt thereof contains at least one substituent group selected from --NH.sub.2, or quaternary amine salts thereof, or --OH; and
- d. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.
- 2. The process of claim 1 wherein said nitro substituted organic compound is a nitrobenzoic acid.
- 3. The process of claim 1 wherein said nitro substituted organic compound is a nitrobenzene sulfonic acid.
- 4. The process of claim 1 wherein said nitro substituted organic compound is a nitrophenol.
- 5. The process of claim 1 wherein said nitro substituted organic compound is a nitroaniline.
- 6. The process of claim 1 wherein said organic amine is ethylenediamine.
- 7. The process of claim 1 wherein said organic amine is ethylenediaminetetraacetic acid.
- 8. The process of claim 1 wherein said organic amine is diethylenetriaminepentaacetic acid.
- 9. The process of claim 1 wherein said organic amine is 1,2-diaminopropane.
- 10. The process of claim 1 wherein said organic amine is 2,3-diaminobutane.
- 11. The process of claim 1 wherein said organic amine is 1,3-diaminopropane.
- 12. The process of claim 1 wherein said organic amine is 1,2,3-triaminopropane.
- 13. The process of claim 1 wherein said organic amine is diethylenetriamine.
- 14. The process of claim 1 wherein said aliphatic carboxylic acid is glycolic acid.
- 15. The process of claim 1 wherein said aliphatic carboxylic acid is lactic acid.
- 16. The process of claim 1 wherein said aliphatic carboxylic acid is tartaric acid.
- 17. The process of claim 1 wherein said aliphatic carboxylic acid is glycine.
- 18. The process of claim 1 wherein said aliphatic carboxylic acid is citric acid.
- 19. The process of claim 1 wherein said aliphatic carboxylic acid is aspartic acid.
- 20. The process of claim 1 wherein said aliphatic carboxylic acid is gluconic acid.
- 21. The process of claim 1 wherein said aliphatic carboxylic acid is cysteine.
- 22. The process of claim 1 wherein said nickel-iron alloy contains from 5 to 90% iron.
- 23. The process of claim 1 wherein said phosphorus oxo moiety exhibits an orthophosphate anion.
- 24. The process of claim 1 wherein said phosphorus oxo moiety exhibits a pyrophosphate anion.
- 25. The process of claim 1 wherein said phosphorus oxo moiety exhibits a tripolyphosphate anion.
- 26. The process of claim 1 wherein said phosphorus oxo moiety exhibits a formula ##STR33## where R is selected from the group consisting of aryl, substituted aryl, and straight or branched alkyl of fewer than nine carbon atoms.
- 27. The process of claim 1 wherein said phosphorus oxo moiety exhibits the formula: ##STR34## wherein R is selected from the group consisting of aryl, substituted aryl, and straight or branched chain alkyl of fewer than nine carbon atoms.
- 28. The process of claim 1 wherein said phosphorus oxo moiety exhibits the formula: ##STR35## wherein R and R' are each independently selected from the group consisting of aryl, substituted aryl, and straight or branched chain alkyl of fewer than nine carbon atoms.
- 29. A composition for selectively stripping nickel-iron alloys from the surface of a ferrous metal substrate which comprises an aqueous bath containing in the absence of any inhibitor to prevent corrosive attack on the substrate:
- a. from 0.015 moles per liter to 2.2 moles per liter of at least one nitro substituted organic compound containing at least one solubilizing group;
- b. from 0.015 moles per liter to 7 moles per liter of at least one organic amine, polyamine or substituted amine or polyamine;
- c. from 0.13 moles per liter to 5.0 moles per liter of at least one aliphatic carboxylic acid or salt thereof, or a compound which will give said carboxylic acid or salt thereof in solution, characterized in that said aliphatic carboxylic acid or salt thereof contains at least one substituent group selected from --NH.sub.2, or quaternary amine salts thereof, or --OH; and
- d. from 0.13 moles per liter to 5.0 moles per liter of at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.
- 30. The composition of claim 29 wherein said nitro substituted organic compound is a nitrobenzoic acid.
- 31. The composition of claim 29 wherein said nitro substituted organic compound is a nitrobenzene sulfonic acid.
- 32. The composition of claim 29 wherein said nitro substituted organic compound is a nitrophenol.
- 33. The composition of claim 29 wherein said nitro substituted organic compound is a nitroaniline.
- 34. The composition of claim 29 wherein said organic amine is ethylene diamine.
- 35. The composition of claim 29 wherein said organic amine is ethylenediaminetetraacetic acid.
- 36. The composition of claim 29 wherein said organic amine is diethylenetriaminepentaacetic acid.
- 37. The composition of claim 29 wherein said organic amine is 1,2-diaminopropane.
- 38. The composition of claim 29 wherein said organic amine is 2,3-diaminobutane.
- 39. The composition of claim 29 wherein said organic amine is 1,3-diaminopropane.
- 40. The composition of claim 29 wherein said organic amine is 1,2,3-triaminopropane.
- 41. The composition of claim 29 wherein said organic amine is diethylenetriamine.
- 42. The composition of claim 29 wherein said aliphatic carboxylic acid is glycolic acid.
- 43. The composition of claim 29 wherein said aliphatic carboxylic acid is lactic acid.
- 44. The composition of claim 29 wherein said aliphatic carboxylic acid is tartaric acid.
- 45. The composition of claim 29 wherein said aliphatic carboxylic acid is glycine.
- 46. The composition of claim 29 wherein said aliphatic carboxylic acid is citric acid.
- 47. The composition of claim 29 wherein said aliphatic carboxylic acid is aspartic acid.
- 48. The composition of claim 29 wherein said aliphatic carboxylic acid is gluconic acid.
- 49. The composition of claim 29 wherein said aliphatic carboxylic acid is cysteine.
- 50. The composition of claim 29 wherein said phosphorus oxo moiety exhibits an orthophosphate anion.
- 51. The composition of claim 29 wherein said phosphorus oxo moiety exhibits a pyrophosphate anion.
- 52. The composition of claim 29 wherein said phosphorus oxo moiety exhibits a tripolyphosphate anion.
- 53. The composition of claim 29 wherein said phosphorus oxo moiety exhibits a formula: ##STR36## where R is selected from the group consisting of aryl, substituted aryl, and straight or branched alkyl of fewer than nine carbon atoms.
- 54. The composition of claim 29 wherein said phosphorus oxo moiety exhibits the formula: ##STR37## wherein R is selected from the group consisting of aryl, substituted aryl, and straight or branched chain alkyl of fewer than nine carbon atoms.
- 55. The composition of claim 29 wherein said phosphorus oxo moiety exhibits the formula: ##STR38## wherein R and R' are each independently selected from the group consisting of aryl, substituted aryl, and straight or branched chain alkyl of fewer than nine carbon atoms.
Parent Case Info
This application is a continuation in part of U.S. applications Ser. Nos. 602,140 and 602,141, each filed Aug. 5, 1975.
US Referenced Citations (7)
Related Publications (1)
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Number |
Date |
Country |
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602141 |
Aug 1975 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
602140 |
Aug 1975 |
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