US5062900A
Expired / Lapsed
US
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Process for the improvement of the corrosion resistance of metallic materials
Assignee: Institut de Recherches de la Siderurgie Francaise IRSID
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Filing: 1989-04-18
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Granted: 1991-11-05
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Expires: 2009-04-18
Abstract
Abstract PCT No. PCT/FR89/00176 Sec. 371 Date Dec. 14, 1989 Sec. 102(e) Date Dec. 14, 1989 PCT Filed Apr. 18, 1989 PCT Pub. No. WO89/10424 PCT Pub. Date Nov. 2, 1989.A subject of the invention is a process for improving the corrosion resistance of a metallic material, characterized in that the metallic material is subjected cold to a surface treatment by a low-temperature plasma, at a pressure of 1 to 103 Pa in an atmosphere comprising at least one gas chosen from the following; oxygen, ozone, nitrogen, hydrogen, air, carbon dioxide, carbon monoxide, the oxides of nitrogen, water, combustion gases and mixtures of these with a neutral gas.
Inventors
- 👤 Roger Berneron
- 👤 Pierre de Gelis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:31
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/36
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
Process for improving the corrosion resistance of a metallic material, wherein the metallic material is maintained at a temperature of less than about 100° C. while being subjected to a surface treatment by a low temperature plasma, at a pressure of from 1 to 10 3 Pa in an atmosphere comprising at least one gas chosen from the following: oxygen, ozone, nitrogen, hydrogen air, carbon dioxide, carbon monoxide, the nitrogen oxides, water, combustion gases, and mixtures of these with a neutral gas, and wherein said material is the cathode for said treatment.
Claim 2
Dependent Claim
92 words
Process for improving the corrosion resistance of a metallic material, wherein the metallic material is maintained at a temperature of less than about 100° C. while being subjected to a surface treatment by a low temperature plasma, at a pressure of from 1 to 10 3 Pa in an atmosphere comprising at least one gas chosen from the following: oxygen, ozone, nitrogen, hydrogen air, carbon dioxide, carbon monoxide, the nitrogen oxides, water, combustion gases, and mixtures of these with a neutral gas, and wherein said material is the cathode for said treatment.
Claim 3
Dependent Claim
16 words
Process according to claim 1 wherein the treatment time is from 1 second to 10 minutes.
Claim 4
Dependent Claim
15 words
Process according to claim 1 wherein the operating voltage is from 100 to 5000 V.
Claim 5
Dependent Claim
14 words
Process according to claim 1 wherein the atmosphere is composed of oxygen and nitrogen.
Claim 6
Dependent Claim
13 words
Process according to claim 1, wherein the atmosphere is composed of carbon dioxide.
Claim 7
Dependent Claim
12 words
Process according to claim 1 wherein the metallic material is stainless steel.
Claim 8
Dependent Claim
23 words
Process according to claim 1, wherein the metallic material is ordinary or weakly alloyed steel, carbon steel, heat treatable steel or refractory steel.
Claim 9
Dependent Claim
16 words
Process according to claim 1, wherein the metallic material is of aluminium or an aluminium alloy.
Claim 10
Dependent Claim
16 words
Process according to claim 1, wherein the metallic material is of titanium or a titanium alloy.
Claim 11
Dependent Claim
16 words
Process according to claim 1, wherein the metallic material is of zirconium or a zirconium alloy.
Claim 12
Dependent Claim
16 words
Process according to claim 1, wherein the metallic material is of zinc or a zinc alloy.
Claim 13
Dependent Claim
15 words
Process according to claim 1, wherein the metallic material is a nickel-based or cobalt-based alloy.
Claim 14
Dependent Claim
16 words
Process according to claim 1, wherein the metallic material is of copper or a copper alloy.
References Cited (Backward Citations)
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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) | 1994-11-04 | 1995-05-06 | 1995-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-04 | 1999-05-06 | 1999-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-04 | 2003-05-06 | 2003-11-05 | $7700.00 | Window Closed / Lapsed |