US4042451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selected stripping of nickel-iron alloys from ferrous substrates
Assignee: M&T HARSHAW
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Filing: 1975-08-05
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Granted: 1977-08-16
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Expires: 1995-08-05
Abstract
Abstract A composition and process for selectively removing nickel and nickel alloys with iron and/or cobalt from a surface of a metal substrate which comprises contacting said metal surface with an aqueous bath containing: A. at least one nitro substituted organic compound: B. at least one organic amine or polyamine or substituted amine or polyamine; and C. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines. By nickel-iron alloy deposit is meant a deposit containing from about 5 to 90 percent by weight iron with that portion which is not iron being primarily nickel or nickel and cobalt. Although small amounts of impurities such as copper, zinc, cadmium, lead, etc. may also be present, the major constituents of the alloy are nickel and iron.
Inventors
- 👤 Ronald J. Lash
- 👤 Edward P. Harbulak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:38
CPC Classifications
D; D06; D06M; D06M7/00; D06M7/005; C; C23; C23F; C23F1/00; C23F1/44; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/34; D21H17/35; D21H17/63; D21H17/66; D21H23/00; D21H23/76; D21H23/765; F; F02; F02M; F02M19/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
87 words
A process for selectively removing nickel-iron alloys or nickel-iron-cobalt alloys, said alloys containing from 5 percent to 90 percent iron, from the surface of a ferrous metal substrate which comprises contacting iron alloys with an aqueous alkaline bath containing: 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; and c. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.
Claim 2
Dependent Claim
87 words
A process for selectively removing nickel-iron alloys or nickel-iron-cobalt alloys, said alloys containing from 5 percent to 90 percent iron, from the surface of a ferrous metal substrate which comprises contacting iron alloys with an aqueous alkaline bath containing: 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; and c. at least one phosphorus oxo acid or organic phosphorus oxo acid or salts thereof or alkyl phosphonate substituted amines.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein said nitro substituted organic compound is a nitrobenzoic acid.
Claim 4
Dependent Claim
16 words
The process of claim 1 wherein said nitro substituted organic compound is a nitrobenzene sulfonic acid.
Claim 5
Dependent Claim
14 words
The process of claim 1 wherein said nitro substituted organic compound is a nitrophenol.
Claim 6
Dependent Claim
14 words
The process of claim 1 wherein said nitro substituted organic compound is a nitroaniline.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said organic amine is ethylene diamine.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein said organic amine is ethylenediaminetetraacetic acid.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein said organic amine is diethylenetriaminepentaacetic acid.
Claim 10
Dependent Claim
11 words
The process of claim 1 wherein said organic amine is 1,2-diaminopropane.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein said organic amine is 2,3-diaminobutane.
Claim 12
Dependent Claim
11 words
The process of claim 1 wherein said organic amine is 1,3-diaminopropane.
Claim 13
Dependent Claim
11 words
The process of claim 1 wherein said organic amine is 1,2,3-triaminopropane.
Claim 14
Dependent Claim
11 words
The process of claim 1 wherein said organic amine is diethylenetriamine.
Claim 15
Dependent Claim
14 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits an orthophosphate anion.
Claim 16
Dependent Claim
14 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits a pyrophosphate anion.
Claim 17
Dependent Claim
14 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits a tripolyphosphate anion.
Claim 18
Dependent Claim
37 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits a formula ##STR5## where R is selected from the group consisting of aryl, substituted aryl, and straight or branched alkyl of fewer than nine carbon atoms.
Claim 19
Dependent Claim
38 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits the formula: ##STR6## wherein R is selected from the group consisting of aryl, substituted aryl, and straight or branched chain alkyl of fewer than nine carbon atoms.
Claim 20
Dependent Claim
42 words
The process of claim 1 wherein said phosphorus oxo moiety exhibits the formula: ##STR7## 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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-15 | 1981-02-14 | 1981-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-15 | 1985-02-14 | 1985-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-15 | 1989-02-14 | 1989-08-16 | $7700.00 | Window Closed / Lapsed |