US4297150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective metal oxide films on metal or alloy substrate surfaces susceptible to coking, corrosion or catalytic activity
Assignee: BP PLC
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Filing: 1980-06-27
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Granted: 1981-10-27
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Expires: 2000-06-27
Abstract
Abstract This case relates to a process for forming protective metal oxide films on metal or alloy substrate surfaces susceptible to coking, corrosion or catalytic activity. The process comprises first preoxidizing the substrate surface and then depositing on the pre-oxidized surface a metal oxide of Ca, Mg, Al, Ga, Ti, Zr, Hf, Ta, Nb or Cr by vapor phase decomposition of a volatile compound of the metal which has at least one metal-oxygen bond. Nitrogen, helium, argon, carbon dioxide, air or steam may be used as carrier gases for the metal compound.
Inventors
- 👤 Alan I. Foster
- 👤 Malcolm L. Sims
- 👤 Dennis Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:46
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/02; B01J12/00; B01J19/0006; B01J19/002; B01J19/0026; B01J33/00; C; C10; C10G; C10G9/00; C10G9/14; C10G9/16; C23; C23C; C23C16/00; C23C16/02; C23C16/0209; C23C16/0218; C23C16/22; C23C16/30; C23C16/40; C23C16/403; C23C16/405; C23C28/00; F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; B01J2219/00; B01J2219/00049; B01J2219/00245; B01J2219/00252; B01J2219/02; B01J2219/0204; B01J2219/0236; B01J2219/024; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
96 words
A process for forming protective films on a structural metal or alloy substrate surface which comprises first pre-oxidising the surface at an elevated temperature in an oxidixing atmosphere and then depositing on the preoxidised substrate surface a film of a high temperature stable, non-volatile oxide of a metal selected from calcium, magnesium, aluminium, gallium, titanium, zirconium, hafnium, tantalum, niobium and chromium by thermal decomposition from the vapour phase of a volatile compound of the metal having at least one metal-oxygen bond in admixture with an inert or oxygenated carrier gas in contact with the pre-oxidised surface.
Claim 2
Dependent Claim
96 words
A process for forming protective films on a structural metal or alloy substrate surface which comprises first pre-oxidising the surface at an elevated temperature in an oxidixing atmosphere and then depositing on the preoxidised substrate surface a film of a high temperature stable, non-volatile oxide of a metal selected from calcium, magnesium, aluminium, gallium, titanium, zirconium, hafnium, tantalum, niobium and chromium by thermal decomposition from the vapour phase of a volatile compound of the metal having at least one metal-oxygen bond in admixture with an inert or oxygenated carrier gas in contact with the pre-oxidised surface.
Claim 3
Dependent Claim
37 words
A process according to claim 1 wherein the surface on which the protective film is formed is of a metal or alloy comprising one or more of copper, aluminium, titanium, zirconium, tantalum, chromium, cobalt, nickel and iron.
Claim 4
Dependent Claim
30 words
A process according to claim 2 wherein the alloy is selected from brasses, cupronickels, mild steel, carbon steels, low alloy steels, stainless steels, high alloy steels, super alloys and zircaloys.
Claim 5
Dependent Claim
38 words
A process according to claim 1 wherein the pre-oxidation of the substrate surface is carried out by flaming or heating in an oxidising atmosphere selected from air, carbon dioxide and steam to provide a thin, adherent oxide film.
Claim 6
Dependent Claim
36 words
A process according to claim 1 wherein the volatile metal compound having at least one metal-oxygen bond and being capable of thermal decomposition to the metal oxide is selected from metal alkoxides, metal-β-diketonates and metal carboxylates.
Claim 7
Dependent Claim
24 words
A process according to claim 5 wherein the volatile metal compound is selected from ethoxides, normal propoxides, isopropoxides, normal butoxides, tertiary butoxides and acetylacetonates.
Claim 8
Dependent Claim
29 words
A process according to claim 6 wherein the volatile metal compound is selected from aluminium isopropoxide, titanium isopropoxide, titanium-n-butoxide, zirconium-n-propoxide, chromium acetylacetonate, aluminium acetylacetonate, tantalum ethoxide and niobium ethoxide.
Claim 9
Dependent Claim
22 words
A process according to claim 1 wherein the carrier gas stream is selected from nitrogen, helium, argon, carbon dioxide, air and steam.
Claim 10
Dependent Claim
16 words
A process according to claim 7 wherein the decomposition is carried out under substantially anhydrous conditions.
Claim 11
Dependent Claim
25 words
A process according to claim 1 wherein the volatile metal compound is either dissolved in a compatible solvent or is diluted with a compatible diluent.
Claim 12
Dependent Claim
20 words
A process according to claim 10 wherein the solvent or diluent is selected from toluene, methanol, isopropanol and tertiary butanol.
Claim 13
Dependent Claim
24 words
A process according to claim 1 wherein the concentration of the volatile metal compound in the carrier gas is less than 10% by volume.
Claim 14
Dependent Claim
26 words
A process according to claim 1 wherein the thermal decomposition of the volatile metal compound is carried out at a temperature between 200° and 1200° C.
Claim 15
Dependent Claim
27 words
A process according to claim 1 wherein the protective oxide film deposited on the substrate surface is of the same metal as that forming the substrate surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |