DE967919C - Process for coloring oxidized aluminum and its alloys with inorganic compounds - Google Patents
Process for coloring oxidized aluminum and its alloys with inorganic compoundsInfo
- Publication number
- DE967919C DE967919C DEB28451A DEB0028451A DE967919C DE 967919 C DE967919 C DE 967919C DE B28451 A DEB28451 A DE B28451A DE B0028451 A DEB0028451 A DE B0028451A DE 967919 C DE967919 C DE 967919C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- coloring
- alternating current
- solutions
- oxidized
- 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
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
Description
Verfahren zum Färben von oxydiertem Aluminium und seinen Legierungen mit anorganischen Verbindungen Es ist bekannt, die Oberfläche von Aluminium und seinen Legierungen nach einer oxydierenden Behandlung mit anorganischen Pigmenten zu färben, und zwar werden die oxydierten Gegenstände nacheinander mit anorganischen Lösungen behandelt, die miteinander eine unlösliche gefärbte Verbindung bilden.Process for coloring oxidized aluminum and its alloys with inorganic compounds It is known the surface of aluminum and its alloys after an oxidizing treatment with inorganic pigments to color, namely the oxidized objects are successively with inorganic ones Treated solutions that form an insoluble colored compound with one another.
Man taucht z. B. oxydiertes Aluminiumblech zuerst in Kobaltazetatlösung und dann in Ammonsulfidlösung. Es bildet sich schwarzes, unlösliches Kobaltsulfid ; oder man taucht oxydiertes Aluminium in Bleiazetatlösung und dann in Ammonsulfidlösung. Im letzteren Fall wird das Aluminiumoxyd dunkelbraun gefärbt durch Bildung von Bleisulfid.One dives z. B. oxidized aluminum sheet first in cobalt acetate solution and then in ammonium sulfide solution. Black, insoluble cobalt sulfide is formed ; or oxidized aluminum is immersed in lead acetate solution and then in ammonium sulfide solution. In the latter case the aluminum oxide is colored dark brown by the formation of lead sulfide.
Man kann bei diesem bekannten Verfahren auch umgekehrt verfahren und die oxydierten Aluminiumteile zuerst in Ammonsulfidlösung und hierauf in die farbige Sulfide ergebenden Salzlösungen tauchen.With this known method, you can also proceed in reverse and the oxidized aluminum parts first in ammonium sulfide solution and then in the colored one Immerse sulphide-yielding saline solutions.
Erfindungsgemäß wurde nun festgestellt, daß das Tauchen in Ammonsulfidlösung nach der Oxydation erspart werden kann, wenn man die zu färbenden Aluminiumgegenstände, wie an sich bekannt, mit Wechselstrom in solchen Lösungen oxydiert, die durch die Wirkung des Wechselstromes zu Schwefelwasserstoff reduziert werden und in den Poren der Aluminiumschicht oder an der Oberfläche der Schicht selbst eingelagert werden bzw. Sulfide bilden.According to the invention it has now been found that immersion in ammonium sulfide solution after oxidation can be saved if the aluminum objects to be colored, as known per se, oxidized with alternating current in such solutions that by the Effect of alternating current to be reduced to hydrogen sulfide and in the pores the aluminum layer or on the surface of the layer itself or form sulfides.
Als Lösungen kommen neben der Schwefelsäure beispielsweise auch wäßrige Lösungen der Kresolsulfonsäuren, Amidosulfonsäure u. dgl. in Frage.In addition to sulfuric acid, aqueous solutions can also be used, for example Solutions of cresol sulfonic acids, amidosulfonic acid and the like are possible.
Nach der Erzeugung solcher Schichten auf Aluminium werden die Gegenstände gewaschen und hierauf in eine wäßrige Lösung von Salzen, die mit Schwefelwasserstoff unlösliche gefärbte Verbindungen bilden, so lange eingetaucht, bis sie den gewünschten Farbton geben.After creating such layers on aluminum, the objects washed and then in an aqueous solution of salts with Hydrogen sulfide will form insoluble colored compounds if immersed so long until they give the desired shade.
Die Werkstücke werden dann gewaschen und schließlich abgedichtet.The workpieces are then washed and finally sealed.
Bei der Abdichtung in heißen verdünnten Lösungen von Salzen des färbenden Stoffes, beispielsweise in heißer, sehr verdünnter kobaltsalzhaltiger wäßriger Lösung in der Konzentration von 1/1o bis 1/1000/0 Kobaltsulfat, werden gewisse Farbtöne dunkler.When waterproofing in hot dilute solutions of salts of the coloring Substance, for example in a hot, very dilute aqueous solution containing cobalt salt in the concentration of 1 / 1o to 1/1000/0 cobalt sulphate, certain color tones are created darker.
Das neue Verfahren sei durch einige Beispiele erläutert. Beispiel I Man oxydiert das handelsübliche 99,5 % Aluminiumblech in i5volumprozentiger Schwefelsäure bei einer Badtemperatur von 2o° C mit Wechselstrom bei 25 Volt Spannung etwa 4o Minuten lang. Nach dieser Zeit werden die Bleche nach dem Waschen so lange in 5%ige Kobaltsulfatlösung von etwa 9o° C getaucht, bis ein schwarzer Farbton gebildet wird. Hierauf wird die gefärbte Schicht in heißer verdünnter kobaltsalzhaltiger Lösung mit einem Gehalt von 1/1o % Kobaltsulfat abgedichtet.The new method is illustrated by a few examples. example The commercially available 99.5% aluminum sheet is oxidized in 15% by volume sulfuric acid at a bath temperature of 20 ° C with alternating current at 25 volts about 4o Minutes. After this time, the sheets will be in 5% strength for so long after washing Cobalt sulfate solution dipped at about 90 ° C until a black hue is formed. The colored layer is then placed in a hot, dilute solution containing cobalt salts sealed with a content of 1/10% cobalt sulfate.
Durch eine Änderung der Oxydationsbedingungen hinsichtlich Temperatur, Spannung und Zeit kann man nach dem Oxydieren durch Eintauchen in heiße Kobaltsulfatlösung Töne von heller bis zu dunkler Bronze erzielen, die durch Abdichtung in heißer kobaltsalzhaltiger Lösung noch vertieft werden können.By changing the oxidation conditions with regard to temperature, The voltage and time can be determined after the oxidation by immersion in hot cobalt sulfate solution Achieve tones from light to dark bronze by sealing in hot cobalt salt Solution can be deepened.
Die Färbungen sind licht- und wetterbeständig. Das so gefärbte Aluminium kann für Architektur-und dekorative Zwecke verwendet werden. Beispiel II Man oxydiert eine Aluminium-Magnesium-Silizium-Legierung in iovolumprozentiger Schwefelsäure mit Wechselstrom bei einer Badtemperatur von 30° und einer Spannung von 30 Volt etwa 30 Minuten lang und taucht diese dann nach dem Waschen in heiße Kadmiumsulfatlösung. Die Aluminiumoxydschicht färbt sich durch Bildung von Kadmiumsulfid gelb. Die gefärbte Schicht wird hierauf durch Eintauchen in heißer verdünnter kadmiumsalzhaltiger Lösung abgedichtet.The colors are lightfast and weatherproof. The aluminum colored in this way can be used for architectural and decorative purposes. EXAMPLE II An aluminum-magnesium-silicon alloy is oxidized in volume percent sulfuric acid with alternating current at a bath temperature of 30 ° and a voltage of 30 volts for about 30 minutes and then immersed in hot cadmium sulfate solution after washing. The aluminum oxide layer turns yellow due to the formation of cadmium sulfide. The colored layer is then sealed by immersion in hot, dilute cadmium salt-containing solution.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB28451A DE967919C (en) | 1953-11-19 | 1953-11-19 | Process for coloring oxidized aluminum and its alloys with inorganic compounds |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB28451A DE967919C (en) | 1953-11-19 | 1953-11-19 | Process for coloring oxidized aluminum and its alloys with inorganic compounds |
Publications (1)
Publication Number | Publication Date |
---|---|
DE967919C true DE967919C (en) | 1957-12-27 |
Family
ID=6962658
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB28451A Expired DE967919C (en) | 1953-11-19 | 1953-11-19 | Process for coloring oxidized aluminum and its alloys with inorganic compounds |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE967919C (en) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE623847C (en) * | 1931-05-15 | |||
CH136660A (en) * | 1927-10-20 | 1929-11-30 | Stafford O Brien & Partners Lt | Process for producing a resistant coating on objects made of aluminum or aluminum alloys. |
DE607473C (en) * | 1931-02-02 | 1934-12-28 | Ver Aluminium Werke Akt Ges | Process for coloring surfaces made of aluminum or aluminum alloys |
GB474704A (en) * | 1935-11-14 | 1937-11-05 | Fred Andrew Wales | Improvements in and relating to the electrolytic coating of aluminium or aluminium alloys |
DE657902C (en) * | 1935-12-11 | 1938-03-16 | Schering Ag | Process for the production of oxide layers on aluminum |
DE677025C (en) * | 1936-10-10 | 1939-06-16 | Siemens & Halske Akt Ges | Process to protect shiny or reflective surfaces on aluminum or aluminum alloys |
-
1953
- 1953-11-19 DE DEB28451A patent/DE967919C/en not_active Expired
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH136660A (en) * | 1927-10-20 | 1929-11-30 | Stafford O Brien & Partners Lt | Process for producing a resistant coating on objects made of aluminum or aluminum alloys. |
DE607473C (en) * | 1931-02-02 | 1934-12-28 | Ver Aluminium Werke Akt Ges | Process for coloring surfaces made of aluminum or aluminum alloys |
DE623847C (en) * | 1931-05-15 | |||
GB474704A (en) * | 1935-11-14 | 1937-11-05 | Fred Andrew Wales | Improvements in and relating to the electrolytic coating of aluminium or aluminium alloys |
DE657902C (en) * | 1935-12-11 | 1938-03-16 | Schering Ag | Process for the production of oxide layers on aluminum |
DE677025C (en) * | 1936-10-10 | 1939-06-16 | Siemens & Halske Akt Ges | Process to protect shiny or reflective surfaces on aluminum or aluminum alloys |
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