DE618830C - Process for producing dark-colored, oxygen-containing layers on copper-containing aluminum alloys - Google Patents
Process for producing dark-colored, oxygen-containing layers on copper-containing aluminum alloysInfo
- Publication number
- DE618830C DE618830C DES112880D DES0112880D DE618830C DE 618830 C DE618830 C DE 618830C DE S112880 D DES112880 D DE S112880D DE S0112880 D DES0112880 D DE S0112880D DE 618830 C DE618830 C DE 618830C
- Authority
- DE
- Germany
- Prior art keywords
- oxygen
- colored
- copper
- aluminum alloys
- dark
- 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
- C25D11/14—Producing integrally coloured layers
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
Verfahren zur Erzeugung dunkelfarbiger, sauerstoffhaltiger Schichten auf kupferhaltigen Aluminiumlegierungen Die Erfindung bezieht sich auf ein einfaches, neues Verfahren zur Erzeugung dunkelfarbiger, sauerstoffhaltiger Schichten auf kupferhaltigen Aluminiumlegierungen. Gemäß der Erfindung wird eine anodisch erzeugte hellfarbige Schicht nachträglich kathodisch behandelt, und zwar in einer Lösung, die lediglich zur elektrolytischen Erzeugung sauerstoffhaltiger Schichten geeignete Bestandteile enthält. Es empfiehlt sich, die katholische Behandlung in einer organischen Säurelösung, zweckmäßig Oxalsäurelösung, durchzuführen. Es spielt für die Erfindung keine erhebliche Rolle, mit welchen Ballösungen, welchen Stromarten und unter welchen Betriebsverhältnissen die primäre Schicht erzeugt ist. In allen Fällen erhält man durch die nachfolgende katholische Behandlung eine dunkle Färbung der sauerstoffhaltigen Schicht, die zwischen dunkelbraun und tiefgrünlichschwarz liegt.Process for the production of dark colored layers containing oxygen on copper-containing aluminum alloys The invention relates to a simple, new process for the production of dark-colored, oxygen-containing layers on copper-containing ones Aluminum alloys. According to the invention, an anodically produced light-colored Layer subsequently treated cathodically, in a solution that is only components suitable for the electrolytic generation of layers containing oxygen contains. It is recommended that the catholic treatment in an organic acid solution, expediently oxalic acid solution to carry out. It does not play a significant role for the invention Role, with which ball solutions, which types of current and under which operating conditions the primary layer is created. In all cases one gets through the following catholic treatment a dark coloration of the oxygenated layer that is between dark brown and deep greenish black.
Ausführungsbeispiele i. Ein Duraluminiumblech von etwa 80 cm2 Oberfläche wird, als Anode geschaltet, der Einwirkung eines Gleichstromes von 3o Volt Spannung in einer ioo/oigen Oxalsäurelösung bei etwa 38°C Badtemperatur 30 Minuten bis i Stunde lang ausgesetzt. Die nach dieser Behandlung erhaltene hellfarbige Schicht wird nachträglich tiefdunkelgrün bis schwarzgrün gefärbt, indem man das vorbehandelte Blech kathodisch i S bis 30 Minuten lang einer Gleichspannung von 2o bis 3o Volt aussetzt. Die Badtemperatur kann wiederum etwa q.0° betragen. Die katholische Behandlung braucht nicht unmittelbar nach der Erzeugung der hellfarbigen, sauerstoffhaltigen Schicht zu erfolgen, sondern das vorbehandelte Blech kann auch abgespült und getrocknet werden, bevor es katholisch behandelt wird. Man kann aber auch unmittelbar im Bad eine Umschaltung von Anode auf Kathode vornehmen. Die Gegenelektrode kann entweder aus dem gleichen oder aus anderem Material bestehen.Embodiments i. A duralumin sheet with a surface area of about 80 cm2, connected as an anode, is exposed to a direct current of 30 volts in a 100% oxalic acid solution at a bath temperature of about 38 ° C for 30 minutes to one hour. The light-colored layer obtained after this treatment is subsequently colored deep dark green to black-green by exposing the pretreated sheet to a direct voltage of 20 to 30 volts cathodically for up to 30 minutes. The bath temperature can again be around 0 °. The catholic treatment does not have to take place immediately after the production of the light-colored, oxygen-containing layer, but the pretreated sheet metal can also be rinsed and dried before it is treated catholic. But you can also switch from anode to cathode directly in the bath. The counter electrode can either consist of the same or a different material.
a. Ein Lautalblech, das entsprechend dem Beispiel i zunächst anodisch und nachträglich katholisch behandelt wurde, bis eine dunkelbräunliche bis dunkelgrünliche Färbung auftrat.a. A Lautalblech which is initially anodic according to example i and was subsequently treated catholic until a dark brownish to dark greenish color Staining occurred.
Statt einer Oxalsäurelösung kann man auch Lösungen von Chromsäure, Schwefelsäure, Phosphorsäure oder Gemische dieser Säuren sowie andere, für die Erzeugung sauerstoffhaltiger Schichten auf Aluminium und seinen Legierungen bekannte Bäder verwenden. Für die kathödische Nachbehandlung sind Lösungen der Oxalsäure, der Malonsäure oder anderer organischer Säuren besonders geeignet.Instead of an oxalic acid solution, you can also use solutions of chromic acid, Sulfuric acid, phosphoric acid or mixtures of these acids and others for the production oxygen-containing layers on aluminum and its alloys known baths use. For the cathodic aftercare are solutions of the Oxalic acid, malonic acid or other organic acids are particularly suitable.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES112880D DE618830C (en) | 1934-02-08 | 1934-02-08 | Process for producing dark-colored, oxygen-containing layers on copper-containing aluminum alloys |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES112880D DE618830C (en) | 1934-02-08 | 1934-02-08 | Process for producing dark-colored, oxygen-containing layers on copper-containing aluminum alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE618830C true DE618830C (en) | 1935-09-17 |
Family
ID=7532100
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES112880D Expired DE618830C (en) | 1934-02-08 | 1934-02-08 | Process for producing dark-colored, oxygen-containing layers on copper-containing aluminum alloys |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE618830C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023149A (en) * | 1957-10-30 | 1962-02-27 | Gen Electric | Electrolytic method of producing thin sheets of aluminum oxide |
FR2083385A1 (en) * | 1970-03-18 | 1971-12-17 | Sumitomo Chemical Co |
-
1934
- 1934-02-08 DE DES112880D patent/DE618830C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3023149A (en) * | 1957-10-30 | 1962-02-27 | Gen Electric | Electrolytic method of producing thin sheets of aluminum oxide |
FR2083385A1 (en) * | 1970-03-18 | 1971-12-17 | Sumitomo Chemical Co |
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