US5871668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant buffer system for metal products
Assignee: Elisha Holding LLC
•
Filing: 1997-09-24
•
Granted: 1999-02-16
•
Expires: 2017-09-24
Abstract
Abstract A system is disclosed for inhibiting the corrosion of ferrous and other metals by passivating the metals. The system includes novel buffered compositions which may be applied to metal products for preventing or retarding corrosion and methods for applying the buffered compositions to metal products such that corrosion protection of the products is achieved through passivation. The methods include an in-situ application to existing structures with metal reinforcement as well as applications to metal products during manufacture. Generally, the compositions may be in various forms and comprise a carrier component and one or more pH buffer components. The buffer is selected to retain the proximity of the metal at a pH at which the metal is passive to corrosion. The compositions are environmentally friendly and are capable of replacing chromates which have been traditionally used with zinc and zinc alloys to inhibit corrosion of metals but which are potentially harmful to the environment.
Inventors
- 👤 Robert L. Heimann
- 👤 William M. Dalton
- 👤 David R. Webb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:20
CPC Classifications
C; C23; C23F; C23F11/00; C09; C09D; C09D5/00; C09D5/08; C23C; C23C28/00; C23C30/00; E; E04; E04C; E04C5/00; E04C5/01; E04C5/015; F; F16; F16D; F16D69/00; F16D69/02; F16D2250/00; F16D2250/0038
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
89 words
A corrosion resistant coating composition comprising a combination of at least one water soluble polymer carrier, at least one solvent, at least one water soluble alkali silicate wherein the corrosion resistance of said coating is improved in comparison to the water soluble polymer water and wherein said composition has a pH of about 8 to 13 for coating iron, steel and iron containing alloys a pH of about 5 to 7 for coating aluminum and aluminum containing alloys and a pH of about 7 to 10 for coating bronze.
Claim 2
Dependent Claim
89 words
A corrosion resistant coating composition comprising a combination of at least one water soluble polymer carrier, at least one solvent, at least one water soluble alkali silicate wherein the corrosion resistance of said coating is improved in comparison to the water soluble polymer water and wherein said composition has a pH of about 8 to 13 for coating iron, steel and iron containing alloys a pH of about 5 to 7 for coating aluminum and aluminum containing alloys and a pH of about 7 to 10 for coating bronze.
Claim 3
Dependent Claim
65 words
A corrosion resistant and passivating composition comprising a combination of at least one carrier selected from the group of consisting of synthetic oil, naturally occurring oil or wax and polymeric resin material, at least one liquid buffer that is dispersible within said carrier and wherein the composition further comprises at least one additive selected from the group consisting of silica, polyethylene, nylon and and tetrafluoroethylene.
Claim 4
Dependent Claim
65 words
A corrosion resistant and passivating composition comprising a combination of at least one carrier selected from the group of consisting of synthetic oil, naturally occurring oil or wax and polymeric resin material, at least one liquid buffer that is dispersible within said carrier and wherein the composition further comprises at least one additive selected from the group consisting of silica, polyethylene, nylon and and tetrafluoroethylene.
Claim 5
Dependent Claim
123 words
A corrosion resistant and passivating coating composition for a metal surface comprising a combination of a carrier comprising at least one member selected from the group consisting of water-reducible alkyds and modified alkyds, acrylic epoxy hybrids, water soluble acrylics, water reducible epoxies, polyurethane dispersions, vinyls and ethylene acetates; at least one solvent; at least one water soluble alkali silicate buffer that is dispersible within said carrier; water and wherein said composition has a pH of about 8 to 13 for coating iron, steel and iron containing alloy, a pH of about 5 to 7 for coating aluminum and aluminum containing alloys and a pH of about 7 to 1 0 for coating bronze and wherein said composition is substantially free of heavy metals.
Claim 6
Dependent Claim
123 words
A corrosion resistant and passivating coating composition for a metal surface comprising a combination of a carrier comprising at least one member selected from the group consisting of water-reducible alkyds and modified alkyds, acrylic epoxy hybrids, water soluble acrylics, water reducible epoxies, polyurethane dispersions, vinyls and ethylene acetates; at least one solvent; at least one water soluble alkali silicate buffer that is dispersible within said carrier; water and wherein said composition has a pH of about 8 to 13 for coating iron, steel and iron containing alloy, a pH of about 5 to 7 for coating aluminum and aluminum containing alloys and a pH of about 7 to 1 0 for coating bronze and wherein said composition is substantially free of heavy metals.
Claim 7
Dependent Claim
22 words
The composition of either claim 2 or claim 3 wherein the buffer comprises at least one of sodium silicate or potassium silicate.
Claim 8
Dependent Claim
16 words
The composition of any one of claims 1, 2, or 3 wherein the carrier comprises polyurethane.
Claim 9
Dependent Claim
21 words
The composition of either claim 2 or claim 3 wherein the buffer comprises less than 60% by volume of the composition.
Claim 10
Dependent Claim
28 words
The composition of either claim 1 or claim 3 wherein the coating comprises a combination of an acrylic polymer carrier, a solvent and at least one alkali silicate.
Claim 11
Dependent Claim
11 words
The composition of claim 1 wherein the solvent comprises 2,2,4-trimethyl, 1-3-pentanediol.
Claim 12
Dependent Claim
23 words
The composition of either claim 1 or claim 2 wherein the carrier comprises at least one of an acrylic polymer or a polyurethane.
Claim 13
Dependent Claim
44 words
The composition of either claim 1 or claim 2 wherein the carrier comprises at least one member selected from the group consisting of water-reducible alkyds and modified alkyds, acrylic latexes, acrylic epoxy hybrids, water reducible epoxies, polyurethane dispersions, and vinyls and cthylene vinyl acetates.
Claim 14
Dependent Claim
29 words
The composition of either claim 1 or claim 3 wherein the composition further comprises at least one additive selected from the group consisting of silica, polyethylene, nylon, and tetrafluoroethylene.
Claim 15
Dependent Claim
19 words
The composition of any one of claims 1, 2 or 3 wherein the composition is substantially free of chromate.
Claim 16
Dependent Claim
20 words
The composition of any one of claims 1, 2, or or 3 further comprising a material for inhibiting microbiological growth.
Claim 17
Dependent Claim
20 words
The composition of any one of claims 1, 2, or 3 further comprising a material for reacting with chloride ions.
Claim 18
Dependent Claim
29 words
The composition of either claim 2 or 3 wherein the carrier comprises at least one member selected from the group consisting of acrylic epoxy hybrids and water reducible epoxies.
References Cited (Backward Citations)
US3425207A
Cited
US3661663A
Cited
US3646748A
Cited
US3700012A
Cited
US3917648A
Cited
US3778994A
Cited
US3903013A
Cited
US3996413A
Cited
US3912548A
Cited
US3885380A
Cited
US4098720A
Cited
US3979896A
Cited
US4133823A
Cited
US3972304A
Cited
US4144074A
Cited
US4123894A
Cited
US4197695A
Cited
US4189619A
Cited
US4341878A
Cited
USRE30612E
Cited
US4446254A
Cited
US4344278A
Cited
US4473936A
Cited
US4347285A
Cited
GB2099416A
Cited
US4445321A
Cited
US4490969A
Cited
US5209987A
Cited
US4683019A
Cited
US4661387A
Cited
US4645790A
Cited
US4555445A
Cited
US4681749A
Cited
US4776161A
Cited
US4635433A
Cited
US4985313A
Cited
US4595425A
Cited
US4643769A
Cited
US4849282A
Cited
US4635432A
Cited
US4921731A
Cited
DE3618841A1
Cited
US4842645A
Cited
US4870814A
Cited
US5068134A
Cited
US4961878A
Cited
US5028489A
Cited
US5004562A
Cited
US5004563A
Cited
US5158605A
Cited
US5166248A
Cited
US5041486A
Cited
US5121573A
Cited
FR2655060A1
Cited
US5139820A
Cited
US5208077A
Cited
US5149439A
Cited
US5137706A
Cited
JPH05195252A
Cited
JPH05195233A
Cited
WO1995013441A1
Cited
US5292799A
Cited
US5432007A
Cited
WO1996012770A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-02-15 | 2002-08-17 | 2003-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-02-15 | 2006-08-17 | 2007-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-02-15 | 2010-08-17 | 2011-02-16 | $7700.00 | Window Closed / Lapsed |