US1929486A - Dyeing oxidized aluminum - Google Patents
Dyeing oxidized aluminum Download PDFInfo
- Publication number
- US1929486A US1929486A US563003A US56300331A US1929486A US 1929486 A US1929486 A US 1929486A US 563003 A US563003 A US 563003A US 56300331 A US56300331 A US 56300331A US 1929486 A US1929486 A US 1929486A
- Authority
- US
- United States
- Prior art keywords
- dyeing
- oxidized
- aluminum
- bath
- dye
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
- C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
- C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
- C25D11/02—Anodisation
- C25D11/04—Anodisation of aluminium or alloys based thereon
- C25D11/18—After-treatment, e.g. pore-sealing
- C25D11/24—Chemical after-treatment
Definitions
- This invention relates to the dyeing of oxidized coatings obtained by the anodic oxidation of aluminum. Its object is to provide a process for obtaining uniform dyeing of the coatings obtained 5 when aluminum is subjected to anodic oxidation in an acid bath.
- aluminum may be oxidized on its surface by being made the anode in an electrolytic cell in which the electrolyte is a solution of one or more oxygen-containing acids,
- the oxidized coating be dyed. If a sufliciently absorbent coating has been obtained, this can be done, as is known in the art, by immersing the oxidized aluminum article, after Washing, in a solution of a suitable dye, particularly a dye which is capable of forming a lake with aluminum oxide, such, for instance, as logwood extract.
Landscapes
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coloring (AREA)
Description
Patented a. 10, 1933 UNITED STATES DYEING OXIDIZED ALUIWINUM Leon W..Eberlin, Rochester, N. Y., assignor to Eastman Kodak Company, Rochester, N. Y., a corporation of New York No Drawing. Application September 15, 1931 Serial No. 563,003
2 Claims.
This invention relates to the dyeing of oxidized coatings obtained by the anodic oxidation of aluminum. Its object is to provide a process for obtaining uniform dyeing of the coatings obtained 5 when aluminum is subjected to anodic oxidation in an acid bath.
As is known in the art, aluminum may be oxidized on its surface by being made the anode in an electrolytic cell in which the electrolyte is a solution of one or more oxygen-containing acids,
such, for example, as oxalic, citric, tartaric, tetrahydronaphthalene sulfonic, chromic, sulfuric, etc., or a mixture of two of these. For many purposes it is desirable that the oxidized coating be dyed. If a sufliciently absorbent coating has been obtained, this can be done, as is known in the art, by immersing the oxidized aluminum article, after Washing, in a solution of a suitable dye, particularly a dye which is capable of forming a lake with aluminum oxide, such, for instance, as logwood extract.
However, aluminum oxidized by electrolysis in acid baths carries acid so tenaciously occluded in the oxidized coating that it is not removed even after many washings. the oxide coating has been found to affect the dyeing so that the oxidized coating is not dyed uniformly. This may be overcome by very carefully adding ammonium hydroxide or other alkaline hydroxides to the dye bath, but it requires extreme care to keep the bath uniform as regards hydrogen ion concentration.
I have found that the dyeing action of a dye solution on an aluminum oxide coating produced by electrolysis in an acid bath can be held uniform with much less attention it an oxide or a The presence of acid in carbonate of an alkaline earth metal, namely, an oxide or a carbonate of calcium, barium or strontium, is added to the dye bath. As these carbonates and oxides are, relatively, diflicultly soluble in water, the hydrogen ion concentration of the dye bath is automatically regulated, for as the dissolved alkali is neutralized by the acid, more alkali dissolves to maintain the equilibrium between solid and dissolved alkali.
As an example of the method of carrying out my invention, when a dye bath is used in which the concentration of the dye is approximately 1%, I prefer to add about 5 grams of calcium carbonate per liter of dye bath. I may, of course, vary these proportions, and I may use other carbonates or oxides of the alkaline earthmetals, in placeof calcium carbonate.
What I claim as my invention, and desire to be secured by Letters Patent of the United States 1s 1. In a process of dyeing the oxidized coating produced on aluminum by electrolysis in an organic acid bath, the step of controlling the uniformity of the dyeing by adding to the dye bath an excess of an alkaline earth carbonate or oxide over that required to neutralize the acid carried in the oxidized coating.
2. In a process of dyeing the oxidized coating produced on aluminum by electrolysis in an organic acid bath,.the step of controlling the uniformity of the dyeing by adding to the dye bath an excess of calcium carbonate over that required tho neutralize the acid carried in the oxidized coat- LEON w. EBERLIN.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US563003A US1929486A (en) | 1931-09-15 | 1931-09-15 | Dyeing oxidized aluminum |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US563003A US1929486A (en) | 1931-09-15 | 1931-09-15 | Dyeing oxidized aluminum |
Publications (1)
Publication Number | Publication Date |
---|---|
US1929486A true US1929486A (en) | 1933-10-10 |
Family
ID=24248678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US563003A Expired - Lifetime US1929486A (en) | 1931-09-15 | 1931-09-15 | Dyeing oxidized aluminum |
Country Status (1)
Country | Link |
---|---|
US (1) | US1929486A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3073760A (en) * | 1959-05-05 | 1963-01-15 | Kaiser Aluminium Chem Corp | Sealing of anodized coatings |
-
1931
- 1931-09-15 US US563003A patent/US1929486A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3073760A (en) * | 1959-05-05 | 1963-01-15 | Kaiser Aluminium Chem Corp | Sealing of anodized coatings |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US2231373A (en) | Coating of articles of aluminum or aluminum alloys | |
US1968483A (en) | Plating aluminium and its alloys | |
US1929486A (en) | Dyeing oxidized aluminum | |
US2550388A (en) | Surface treatment of aluminum and aluminum alloys | |
JPH03277797A (en) | Sealing treatment of aluminum anodically oxidized film | |
US1936058A (en) | Production of corrosion-resistant coatings on aluminum and aluminum alloys | |
US2154455A (en) | Cadmium bright dip | |
US1922853A (en) | Process for the electrolytic deposition of chromium | |
GB1069168A (en) | Composite coated aluminium articles | |
US2339806A (en) | Surface treatment of aluminum and aluminum alloys | |
GB636954A (en) | Lustrous zinc and method for production thereof | |
US3929612A (en) | Process for electrolytically coloring the anodically oxidized coating on aluminum or aluminum base alloys | |
US2550544A (en) | Method of anodically polishing aluminum | |
US3365380A (en) | Electrolytic polishing solution and the process of polishing therewith | |
US1953998A (en) | Anodic coating of zinc base metals | |
US3275537A (en) | Process of anodizing aluminum | |
DE356079C (en) | Process for coloring metallic surfaces | |
JPS6253598B2 (en) | ||
US3330744A (en) | Anodic treatment of zinc and zinc-base alloys and product thereof | |
US3024095A (en) | Acid treatment of tantalum to remove surface irregularities | |
Neufeld et al. | The electropolishing of aluminum | |
Atkins | REPORT OF COMMITTEE ON DESCRIPTIVE CHART PART III. A MODIFICATION OF THE GRAM STAIN | |
GB361560A (en) | Improvements in or relating to methods of manufacturing electron emitting coated cathodes | |
JPS5920759B2 (en) | Coloring method for aluminum or aluminum alloy | |
US3232855A (en) | Process for electrolytic polishing of aluminum |