US3663379A
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Method and electrolytes for anodizing titanium and its alloys
Assignee: Rohr Inc
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Filing: 1969-07-01
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Granted: 1972-05-16
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Expires: 1989-07-01
Abstract
Abstract Titanium and its alloys are anodized by making the metal the anode in an electrolytic system which utilizes carbon as the cathode and an electrolyte consisting of water, both a silicate and a perborate of an alkali metal, the hydroxide of an alkali metal, and the alkali metal salt of an acid selected from the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, and mixtures thereof. Direct current applied to the system may be varied between 10 and 50 amperes per square foot of anode surface, with EMF pressures not exceeding a rate of 8 volts per minute until the current threshold is obtained.
Inventors
- 👤 Earl W Kendall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:05
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
The electrolyte defined in claim 1 wherein said silicate is sodium meta silicate, said perborate is sodium perborate, and said salt is the tetra sodium salt of ethylenediamine tetraacetic acid.
Claim 2
Independent Claim
101 words
A method of anodizing titanium and its alloys which comprises making the metal the anode in an electrolytic system wherein carbon is the cathode and the electrolyte has the following composition: about 1.0 to 5.0 weight percent of an alkali metal silicate; about 1.0 to 3.75 weight percent of an alkali metal perborate; about 1.0 to 5.0 weight percent of an alkali-metal hydroxide; about 1.0 to 5.0 weight percent of an alkali metal salt of an acid selected from the group consisting of ethylenediamine tetraacetic acid, diethylenetriamine pentaacetic acid, and mixtures thereof; and about 81.25 to 96 weight percent of water.
Claim 3
Dependent Claim
35 words
The method defined in claim 3 wherein said silicate is sodium meta silicate, said perborate is sodium perborate, said hydroxide is sodium hydroxide, and said salt is the tetra sodium salt of ethylenediamine tetraacetic acid.
Claim 4
Dependent Claim
58 words
The method defined in claim 3 wherein the EMF applied to said electrolytic system is not to exceed 8 volts per minute until a predetermined current of between 10 and 50 amperes per square foot of anode surface is obtained, at which point in time said predetermined current is permitted to flow for from 10 to 60 minutes.
Claim 5
Dependent Claim
23 words
The method defined in claim 3 wherein the ratio of the area of said cathode to said anode is about 2 to 1.
Claim 6
Dependent Claim
20 words
The method defined in claim 3 wherein said electrolyte is maintained at a temperature of between 65* to 100* F.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |