US4400408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for forming an anticorrosive coating on a metal substrate
Assignee: De Nora Permelec Ltd
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Filing: 1981-05-14
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Granted: 1983-08-23
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Expires: 2001-05-14
Abstract
Abstract A method for forming an anticorrosive coating on the surface of a metal substrate, which comprises, in one embodiment, (1) coating the surface of the metal substrate with an anticorrosive metal capable of forming an alloy with the substrate metal and/or a hydride of the anticorrosive metal; (2) heating the coated surface, and then; (3) heating the coated surface in a vacuum or in an atmosphere substantially inert to the metal coating and the metal substrate by irradiating the coated surface with electron beams, laser beams or a plasma arc to sinter the coated metal and form an alloy layer in the interface between the metal substrate and the metal coating and, in another embodiment, subsequent to Step (2) and prior Step (3) above, coating the coated surface with a solution of a thermally decomposable platinum-group metal compound and then heating the resulting coated surface at about 40° C. to about 600° C.
Inventors
- 👤 Hiroshi Asano
- 👤 Takayuki Shimamune
- 👤 Toshiki Goto
- 👤 Hideo Nitta
- 👤 Masashi Hosonuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
C; C23; C23C; C23C24/00; C23C24/08; C23C24/10; C23C24/103; C23C24/106; B; B22; B22F; B22F7/00; B22F7/02; B22F7/04; C23C18/00; C23C18/14; C23C18/143; C23C18/145
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A method for forming an anticorrosive coating on the surface of a metal substrate, which comprises: (1) coating the surface of the metal substrate with a powder of an anticorrosive metal capable of forming an alloy with the substrate metal and/or a hydride of the anticorrosive metal; (2) heating the coated surface; and then (3) heating the coated surface in a vacuum or in an atmosphere substantially inert to the metal coating and the metal substrate by irradiating the coated surface with electron beams or a plasma arc to sinter the coated metal and form an alloy layer only in the interface between the metal substrate and the metal coating.
Claim 2
Independent Claim
110 words
A method for forming an anticorrosive coating on the surface of a metal substrate, which comprises: (1) coating the surface of the metal substrate with a powder of an anticorrosive metal capable of forming an alloy with the substrate metal and/or a hydride of the anticorrosive metal; (2) heating the coated surface; and then (3) heating the coated surface in a vacuum or in an atmosphere substantially inert to the metal coating and the metal substrate by irradiating the coated surface with electron beams or a plasma arc to sinter the coated metal and form an alloy layer only in the interface between the metal substrate and the metal coating.
Claim 3
Independent Claim
139 words
A method for forming an anticorrosive coating on the surface of a metal substrate, which comprises: (1) coating the surface of the metal substrate with a powder of an anticorrosive metal capable of forming an alloy with the substrate metal and/or a hydride of the anticorrosive metal; (2) heating the coated surface; (3) coating the coated surface with a solution of a thermally decomposable platinum-group metal compound; (4) heating the resulting coated surface at about 40° C. to about 600° C.; and then (5) heating the coated surface in a vacuum or in an atmosphere substantially inert to the metal coating and the metal substrate by irradiating the coated surface with electron beams or a plasma arc to sinter the coated metal and form an alloy layer only in the interface between the metal substrate and the metal coating.
Claim 4
Independent Claim
139 words
A method for forming an anticorrosive coating on the surface of a metal substrate, which comprises: (1) coating the surface of the metal substrate with a powder of an anticorrosive metal capable of forming an alloy with the substrate metal and/or a hydride of the anticorrosive metal; (2) heating the coated surface; (3) coating the coated surface with a solution of a thermally decomposable platinum-group metal compound; (4) heating the resulting coated surface at about 40° C. to about 600° C.; and then (5) heating the coated surface in a vacuum or in an atmosphere substantially inert to the metal coating and the metal substrate by irradiating the coated surface with electron beams or a plasma arc to sinter the coated metal and form an alloy layer only in the interface between the metal substrate and the metal coating.
Claim 5
Dependent Claim
29 words
The method as in claim 1 or 2, wherein after irradiation with the electron beams or plasma arc, the method includes subjecting the coated surface to a rolling treatment.
Claim 6
Dependent Claim
30 words
The method as in claim 3, wherein after said rolling treatment, the method includes heating the coated surface by irradiating the coated surface with electron beams or a plasma arc.
Claim 7
Dependent Claim
25 words
The method as in claim 1 or 2, wherein the metal substrate is titanium, tantalum, zirconium, niobium or an alloy composed mainly of these metals.
Claim 8
Dependent Claim
25 words
The method as in claim 1 or 2, wherein the metal substrate is iron, nickel, cobalt, copper, or an alloy composed mainly of these metals.
Claim 9
Dependent Claim
38 words
The method as in claim 1 or 2, wherein the anticorrosive metal and/or the hydride of the metal is selected from the group consisting of tantalum, zirconium, niobium, titanium, molybdenum, tungsten, vanadium, chromium, nickel, silicon and hydrides thereof.
Claim 10
Dependent Claim
33 words
The method as in claim 2, wherein the platinum-group metal compound is selected from the group consisting of halogen-compounds of and organic compounds of platinum, iridium, ruthenium, palladium and rhodium, and mixtures thereof.
Claim 11
Dependent Claim
43 words
The method as in claim 1 or 2, wherein the irradiation of the surface with electron beams or a plasma arc is with an intensity sufficient to form said alloy layer only in the interface between said metal substrate and said metal coating.
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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) | 1986-08-22 | 1987-02-21 | 1987-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-22 | 1991-02-21 | 1991-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-22 | 1995-02-21 | 1995-08-23 | $7700.00 | Window Closed / Lapsed |