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US4045599A
Expired / Lapsed
US
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Low temperature sealing of anodized aluminum
Assignee: Alcoa Corp
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Filing: 1976-01-15
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Granted: 1977-08-30
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Expires: 1996-01-15
Abstract
Abstract A method of forming a low temperature seal on anodized aluminum and removing sealing smudge therefrom comprises treating anodized aluminum with an aqueous sealing solution at a temperature of at least 140° F. and containing 2 to 6 g/l of hydrolyzable metallic salt, 5 to 20 ml/l of an ethanolamine and 50 to 2000 mg/l soluble sulfate (SO 4 = ), and thereafter removing sealing smudge formed by this treatment with mineral acid.
Inventors
- 👤 Edward G. Remaley
- 👤 Robert W. Baker
- 👤 Raymond J. Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:51
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/24; C25D11/246
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
A method for forming a low temperature seal on anodized aluminum and removing sealing smudge therefrom comprising: a. contacting said anodized aluminum with an aqueous sealing solution containing 2 to 6 g/l of hydrolyzable metallic salt, 5 to 20 ml/l of an ethanolamine, and 50 to 2000 mg/l soluble sulfate (SO 4 = ), for a period of time sufficient to provide said seal, said solution being capable of providing a seal at a temperature of at least 140° F; and b. removing sealing smudge formed in said prior step with mineral acid.
Claim 2
Independent Claim
93 words
A method for forming a low temperature seal on anodized aluminum and removing sealing smudge therefrom comprising: a. contacting said anodized aluminum with an aqueous sealing solution containing 2 to 6 g/l of hydrolyzable metallic salt, 5 to 20 ml/l of an ethanolamine, and 50 to 2000 mg/l soluble sulfate (SO 4 = ), for a period of time sufficient to provide said seal, said solution being capable of providing a seal at a temperature of at least 140° F; and b. removing sealing smudge formed in said prior step with mineral acid.
Claim 3
Dependent Claim
11 words
The method according to claim 1 wherein the ethanolamine is triethanolamine.
Claim 4
Dependent Claim
20 words
The method according to claim 1 wherein the pH of sealing solution is in the range of 6.5 to 7.5.
Claim 5
Dependent Claim
23 words
The method according to claim 1 wherein the hydrolyzable metal salt is selected from the group consisting of nickel acetate, and nickel sulfate.
Claim 6
Dependent Claim
14 words
The method according to claim 4 wherein the hydrolyzable metallic salt is nickel acetate.
Claim 7
Dependent Claim
15 words
The method according to claim 1 wherein said aqueous solution comprises distilled or deionized water.
Claim 8
Dependent Claim
19 words
The method according to claim 2 wherein the weight ratio of hydrolyzable salt to triethanolamine is at least 0.18.
Claim 9
Independent Claim
131 words
A method of forming a low temperature seal on anodized aluminum and removing sealing smudge therefrom comprising: a. providing a sealing solution consisting essentially of water, 2 to 6 g/l hydrolyzable metallic salt selected from the group consisting of nickel acetate and nickel sulfate, 5 to 20 ml/l of triethanolamine, and 50 to 2000 mg/l soluble sulfate (SO 4 = ), wherein said soluble sulfate (SO 4 = ) is added to said water before said salt or said triethanolamine, b. treating said anodized aluminum in said sealing solution at a temperature in the range of 150° to 170° F for a time period not greater than 45 minutes to provide said seal, and c. removing sealing smudge formed in said treating step with mineral acid to provide smudge-free, anodized aluminum.
Claim 10
Independent Claim
131 words
A method of forming a low temperature seal on anodized aluminum and removing sealing smudge therefrom comprising: a. providing a sealing solution consisting essentially of water, 2 to 6 g/l hydrolyzable metallic salt selected from the group consisting of nickel acetate and nickel sulfate, 5 to 20 ml/l of triethanolamine, and 50 to 2000 mg/l soluble sulfate (SO 4 = ), wherein said soluble sulfate (SO 4 = ) is added to said water before said salt or said triethanolamine, b. treating said anodized aluminum in said sealing solution at a temperature in the range of 150° to 170° F for a time period not greater than 45 minutes to provide said seal, and c. removing sealing smudge formed in said treating step with mineral acid to provide smudge-free, anodized aluminum.
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) | 1980-08-29 | 1981-02-28 | 1981-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-29 | 1985-02-28 | 1985-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-29 | 1989-02-28 | 1989-08-30 | $7700.00 | Window Closed / Lapsed |