Patent US5132877A successfully refreshed from Google Patents.
Patent US3936583A successfully refreshed from Google Patents.
US3936583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of corrosion in metals
Assignee: UK Secretary of State for Trade and Industry
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Filing: 1973-10-25
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Granted: 1976-02-03
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Expires: 1993-10-25
Abstract
Abstract A method of protecting an article having at least a surface layer of an alloy of iron and/or nickel which contains at least 1 per cent of chromium, against high temperature oxidation, by contacting the article with a solution or a suspension of a borate and/or a phosphate in a volatile polar organic solvent so that, after removal of the solvent, a film weighing at least 3 mu g / cm2 of the borate and/or phosphate material is deposited on the surface of the article.
Inventors
- 👤 Geoffrey Oliver Lloyd
- 👤 John Ernest Rhoades-Brown
- 👤 Stuart Richard John Saunders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:53
CPC Classifications
C; C21; C21D; C21D1/00; C21D1/68; C21D1/70; C23; C23C; C23C22/00; C23C22/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
94 words
A process for the protection of the surface of an article, said surface being an iron or nickel alloy which contains at least 1 per cent by weight of chromium, against high temperature oxidation comprising contacting the same article with a solution or a suspension of a material selected from the group consisting of borax, sodium metaborate, zinc borate and boric acid, in a volatile polar organic solvent, whereby, after removal of the solvent, a film weighing at least 3 μg/cm 2 of the said material is deposited on the surface of the article.
Claim 2
Dependent Claim
94 words
A process for the protection of the surface of an article, said surface being an iron or nickel alloy which contains at least 1 per cent by weight of chromium, against high temperature oxidation comprising contacting the same article with a solution or a suspension of a material selected from the group consisting of borax, sodium metaborate, zinc borate and boric acid, in a volatile polar organic solvent, whereby, after removal of the solvent, a film weighing at least 3 μg/cm 2 of the said material is deposited on the surface of the article.
Claim 3
Dependent Claim
24 words
A process according to claim 1 wherein the chromium is present in the alloy in the range 3 to 30 per cent by weight.
Claim 4
Dependent Claim
11 words
A process according to claim 1 wherein the borate is borax.
Claim 5
Dependent Claim
41 words
A process according to claim 1 wherein the polar organic solvent is selected from the group consisting of methyl alcohol, ethyl alcohol, n-propyl alcohol, iso-propyl alcohol, n-butyl alcohol, iso-butyl alcohol, t-butyl alcohol, acetone, methyl ethyl ketone, 1,4 dioxane and ethylene glycol.
Claim 6
Dependent Claim
19 words
A process according to claim 1 wherein the solution or suspension of a borate contains additionally silica or tetraethylorthosilicate.
Claim 7
Dependent Claim
12 words
An iron or nickel alloy treated by the process of claim 1.
Claim 8
Dependent Claim
86 words
A process for retarding the production of a scale by oxidation at a temperature of 600°C or above on an iron or nickel alloy containing at least 1 per cent by weight of chromium which comprises coating the surface of the alloy with a material selected from the group consisting of borax, sodium metaborate, zinc borate and boric acid, in a polar solvent and removing the solvent to leave a film weighing at least 3 μg/cm 2 of the borate on the surface of the alloy.
Claim 9
Dependent Claim
86 words
A process for retarding the production of a scale by oxidation at a temperature of 600°C or above on an iron or nickel alloy containing at least 1 per cent by weight of chromium which comprises coating the surface of the alloy with a material selected from the group consisting of borax, sodium metaborate, zinc borate and boric acid, in a polar solvent and removing the solvent to leave a film weighing at least 3 μg/cm 2 of the borate on the surface of the alloy.
References Cited (Backward Citations)
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US3197345A
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US3338754A
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US3530012A
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US3796608A
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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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |