US4212701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and composition of low toxicity for preparing aluminum surfaces for adhesive bonding
Assignee: United States Department of the Army
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Filing: 1979-05-09
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Granted: 1980-07-15
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Expires: 1999-05-09
Abstract
Abstract The invention provides a process and composition of low toxicity for preparing aluminum surfaces for adhesive bonding. The process involves treating the aluminum with an etching composition composed of sulfuric acid, ferric sulfate and water. The invention eliminates the toxicity and pollution problems associated with the conventional chromate-type etching baths, reduces the contamination of the work place and environment to acceptable levels, and produces aluminum surfaces, which when adhesively bonded yield joints comparable in strength to those obtained by use of the conventional chromate-type etchant bath.
Inventors
- 👤 William J. Russel
- 👤 Elizabeth A. Garnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:17
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16; C23F1/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
67 words
A process for adhesive bonding of aluminum parts, wherein the aluminum parts prior to bonding are subjected to an etching process to produce a surface preparatory to adhesive bonding, which comprises contacting the aluminum part with an etchant composition consisting essentially of about 25 to 35 weight percent sulfuric acid 96% 5 weight percent to saturated solution of ferric sulfate 75% 50 to 70 weight percent water.
Claim 2
Dependent Claim
67 words
A process for adhesive bonding of aluminum parts, wherein the aluminum parts prior to bonding are subjected to an etching process to produce a surface preparatory to adhesive bonding, which comprises contacting the aluminum part with an etchant composition consisting essentially of about 25 to 35 weight percent sulfuric acid 96% 5 weight percent to saturated solution of ferric sulfate 75% 50 to 70 weight percent water.
Claim 3
Dependent Claim
35 words
A process according to claim 1, wherein the composition consists essentially of about 28 to 30 weight percent sulfuric acid 96% 10 to 14 weight percent ferric sulfate 75% 58 to 62 weight percent water.
Claim 4
Dependent Claim
17 words
A process according to claim 1, wherein the adhesive bonding is accomplished with an epoxy resin adhesive.
Claim 5
Dependent Claim
38 words
A composition for etching aluminum preparatory to adhesive bonding, which consists essentially of about 25 to 35 weight percent sulfuric acid 96% 5 weight percent to saturated solution of ferric sulfate 75% 50 to 70 weight percent water.
Claim 6
Dependent Claim
38 words
A composition for etching aluminum preparatory to adhesive bonding, which consists essentially of about 25 to 35 weight percent sulfuric acid 96% 5 weight percent to saturated solution of ferric sulfate 75% 50 to 70 weight percent water.
Claim 7
Dependent Claim
32 words
A composition according to claim 4, which consists essentially of 28 to 30 weight percent sulfuric acid 96% 10 to 14 weight percent ferric sulfate 75% 58 to 62 weight percent water.
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) | 1983-07-15 | 1984-01-14 | 1984-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-15 | 1988-01-14 | 1988-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-15 | 1992-01-14 | 1992-07-15 | $7700.00 | Window Closed / Lapsed |