US3878056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for electrolytic coloring of the anodic oxide film on a aluminum or aluminum base alloys
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1974-08-26
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Granted: 1975-04-15
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Expires: 1994-08-26
Abstract
Abstract In the process of coloring an anodized aluminum or aluminum alloy article by subjecting the anodized article to an electrolytic treatment with a direct current in an aqueous electrolytic coloring bath containing a metal salt, the oxide film on the article can be colored in a stable manner and in a deep color by applying repeatedly, after subjecting the article to a cathodic direct current electrolysis in an electrolytic coloring bath containing the metal salt, an anodic direct current electrolysis and then further a cathodic direct current electrolysis to the article.
Inventors
- 👤 Kiyomi Yanagida
- 👤 Tadashi Hirokane
- 👤 Tadashi Tsukiyasu
- 👤 Tomoari Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:19
CPC Classifications
C; C25; C25D; C25D11/00; C25D11/02; C25D11/04; C25D11/18; C25D11/20; C25D11/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A PROCESS FOR ELECTROLYTICALLY COLORING AN ANODIC OXIDE COATING ON ALUMINUM OR AN ALUMINUM ALLOY ARTICLE BY SUBJECTING THE ARTICLE HAVING AN ANODIZED OXIDE FILM OF A THICKNESS OF AT LEAST ABOUT 6 MICRONS TO A DIRECT CURRENT ELECTROLYSIS IN AN AQUEOUS ELECTROLYTIC COLORING BATH CONTAINING A WATER-SOLUBLE METAL SALT, WHICH COMPRISES APPLYING FIRST TO THE ANODIZED ARTICLE A CATHODIC ELECTROLYSIS WHEREIN THE ALUMINUM ARTICLE IS SUBJECTED TO A DIRECT CURRENT ELECTROLYSIS AS THE CATHODE FOR AT LEAST A FEW SECONDS AND THEN APPLYING ALTERNATINGLY AT LEAST ONCE TO THE ARTICLE AN ANODIC ELECTROLYSIS WHEREIN THE ARTICLE AS THE ANODE IS SUBJECTED TO AA DIRECT CURRENT ELECTROLYSIS AND A CATHODIC ELECTROLYSIS WHEREIN THE ARTICLE AS THE CATHODE IS SUBJECTED TO A DIRECT CURRENT ELECTROLYSIS.
Claim 2
Dependent Claim
124 words
A PROCESS FOR ELECTROLYTICALLY COLORING AN ANODIC OXIDE COATING ON ALUMINUM OR AN ALUMINUM ALLOY ARTICLE BY SUBJECTING THE ARTICLE HAVING AN ANODIZED OXIDE FILM OF A THICKNESS OF AT LEAST ABOUT 6 MICRONS TO A DIRECT CURRENT ELECTROLYSIS IN AN AQUEOUS ELECTROLYTIC COLORING BATH CONTAINING A WATER-SOLUBLE METAL SALT, WHICH COMPRISES APPLYING FIRST TO THE ANODIZED ARTICLE A CATHODIC ELECTROLYSIS WHEREIN THE ALUMINUM ARTICLE IS SUBJECTED TO A DIRECT CURRENT ELECTROLYSIS AS THE CATHODE FOR AT LEAST A FEW SECONDS AND THEN APPLYING ALTERNATINGLY AT LEAST ONCE TO THE ARTICLE AN ANODIC ELECTROLYSIS WHEREIN THE ARTICLE AS THE ANODE IS SUBJECTED TO AA DIRECT CURRENT ELECTROLYSIS AND A CATHODIC ELECTROLYSIS WHEREIN THE ARTICLE AS THE CATHODE IS SUBJECTED TO A DIRECT CURRENT ELECTROLYSIS.
Claim 3
Dependent Claim
32 words
The process as claimed in claim 1, wherein the anodic oxide coating is obtained by anodically oxidizing the article in an anodic oxidation bath containing sulfuric acid or an aromatic sulfonic acid.
Claim 4
Dependent Claim
28 words
The process as claimed in claim 1, wherein said first cathodic electrolysis for the article is conducted in an aqueous electrolytic coloring bath containing a watersoluble nickel salt.
Claim 5
Dependent Claim
20 words
The process as claimed in claim 3, wherein said water-soluble nickel salt is nickel sulfate, nickel chloride, or nickel acetate.
Claim 6
Dependent Claim
37 words
The process as claimed in claim 1, wherein said first cathodic electrolysis for the article is conducted in an aqueous electrolytic coloring bath containing a copper salt, a tin salt, a cobalt salt, or an iron salt.
Claim 7
Dependent Claim
38 words
The process as claimed in claim 1, wherein said electrolytic coloring bath used for the first cathodic electrolysis further contains boric acid or sulfuric acid for adjustment of the pH and electric conductivity of the electrolytic coloring bath.
Claim 8
Dependent Claim
43 words
The process as claimed in claim 1, wherein said first cathodic electrolysis for the article is conducted at a current density of about 0.05 to 3.0 amp./dm.2, at a temperature of about 10 to 40*C., and for about 2 seconds to 3 minutes.
Claim 9
Dependent Claim
31 words
The process as claimed in claim 1, wherein said subsequent anodic electrolysis and the cathodic electrolysis are conducted in the same electrolytic coloring bath as used in the first cathodic electrolysis.
Claim 10
Dependent Claim
34 words
The process as claimed in claim 1, wherein said anodic electrolysis is conducted for about 5 to 30 seconds at a current density of about 0.2 to 1.5 amp./dm.2 and at about room temperature.
Claim 11
Dependent Claim
24 words
The process as claimed in claim 1, wherein said second cathodic electrolysis is conducted under the same conditions as in the first cathodic electrolysis.
Claim 12
Dependent Claim
27 words
The process as claimed in claim 1, wherein said anodic electrolysis is conducted in an electrolytic bath different from the electrolytic coloring bath for the cathodic electrolysis.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |