Patent DE725062C successfully refreshed from Google Patents.
US4028205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface treatment of aluminum
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1975-09-29
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Granted: 1977-06-07
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Expires: 1995-09-29
Abstract
Abstract This invention is directed to a method of pretreating an aluminum surface for the application of paint, adhesives and the like comprising subjecting the surface to the high temperature action of an alkaline solution containing a nonionic or anionic surface active wetting agent which retards the etching of the aluminum surface by the caustic solution.
Inventors
- 👤 Geoffrey A. Dorsey, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:52
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/60; C23C22/66
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
112 words
A method of forming a hydrophilic oxide coating on an aluminum surface which facilitates the bonding thereto of curable organic matter comprising treating the aluminum surface with an aqueous alkaline solution consisting essentially of caustic alkali, a surfactant and the balance water, with the interfacial temperature between the aluminum surface and the treating solution ranging from about 50° C to the boiling point of the solution, the pH of the solution controlled by caustic alkali to more than 8 but less than 10 and the surfactant retarding the etching of the solution so as to effect the formation of the desired oxide coating which facilitates the bonding of the curable organic matter.
Claim 2
Independent Claim
112 words
A method of forming a hydrophilic oxide coating on an aluminum surface which facilitates the bonding thereto of curable organic matter comprising treating the aluminum surface with an aqueous alkaline solution consisting essentially of caustic alkali, a surfactant and the balance water, with the interfacial temperature between the aluminum surface and the treating solution ranging from about 50° C to the boiling point of the solution, the pH of the solution controlled by caustic alkali to more than 8 but less than 10 and the surfactant retarding the etching of the solution so as to effect the formation of the desired oxide coating which facilitates the bonding of the curable organic matter.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the surfactant is selected from the group consisting of nonionic and anionic surfactants.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the caustic alkali is selected from the group consisting of sodium hydroxide, potassium hydroxide and lithium hydroxide.
Claim 5
Dependent Claim
15 words
The method of claim 1 wherein the solution contains from about 0.0001 to 1% surfactant.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the solution pH is buffered by an alkali metal salt selected from the group consisting of borate, carbonate, phosphate, acetate and sulfate.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the interfacial temperature is about 75°-95° C.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the pH of the solution is from about 9-10.
Claim 9
Dependent Claim
14 words
The method of claim 1 wherein the treatment time is less than 1 minute.
Claim 10
Dependent Claim
52 words
The method of claim 2 wherein the surfactant is selected from the group consisting of a. condensation products of ethylene oxide or propylene oxide with alkyl, aryl or alkylaryl alcohols, esters, ethers and carboxylic acids; b. sulfonated alkyl, aryl or alkylaryl compounds; and c. alkyl, aryl or alkyl aryl phosphates or phosphonates.
Claim 11
Dependent Claim
17 words
The method of claim 1 wherein the treated surface is coated with an organic material and cured.
Claim 12
Dependent Claim
11 words
The method of claim 10 wherein said organic material is paint.
Claim 13
Dependent Claim
12 words
The method of claim 10 wherein said organic material is an adhesive.
Claim 14
Dependent Claim
28 words
The method of claim 11 wherein the treated surface is electrocoated with a water-based primer coat, painted with a top coat and then both coats are cured simultaneously.
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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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |