DE500951C - Process for coloring copper and copper alloys by electrolytic means - Google Patents
Process for coloring copper and copper alloys by electrolytic meansInfo
- Publication number
- DE500951C DE500951C DED53786D DED0053786D DE500951C DE 500951 C DE500951 C DE 500951C DE D53786 D DED53786 D DE D53786D DE D0053786 D DED0053786 D DE D0053786D DE 500951 C DE500951 C DE 500951C
- Authority
- DE
- Germany
- Prior art keywords
- copper
- coloring
- alloys
- electrolytic means
- mercury
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Electroplating Methods And Accessories (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Verfahren zum Färben von Kupfer und Kupferlegierungen auf elektrolytischem Wege Es ist bekannt, Kupfer und seine Legierungen auf galvanischem Wege zu färben, indem man sie als Anode in einen Elektrolyten hängt. Je nach der Dauer der Einwirkung des elektrischen Stromes wird durch den an der Anode auftretenden Sauerstoff das Kupfer oxydiert und je nach dem Grad der Oxydation %in farbige oder schwarze Kupferverbindungen überführt, in kohlensauren Salzlösungen eventuell auch karbonisiert, wodurch eine grüne Patina erhalten wird.Process for coloring copper and copper alloys on electrolytic Ways It is known to color copper and its alloys by electroplating, by hanging them in an electrolyte as an anode. Depending on the duration of the exposure of the electric current is due to the oxygen occurring at the anode Copper oxidizes and, depending on the degree of oxidation, turns into colored or black copper compounds transferred, possibly also carbonized in carbonic acid salt solutions, whereby a green patina is obtained.
Die bis jetzt bekannten Verfahren besitzen aber den Nachteil, d'aß die erzielbare Färbung sowohl hinsichtlich des Farbtones wie in bezug auf die Gleichmäßigkeit nicht mit Sicherheit vorausbestimmt werden kann. Vielfach findet überhaupt keine Färbung statt, sondern nur ein Anätzen, oder die Färbung entsteht nur fleckenweise. Dieser Übelstand wird der vorliegenden Erfindung gemäß dadurch behoben, daß ein Elektrolyt Anwendung findet, der Nitritsalze, z. B. Natriumnitrit, Kaliumnitrit, Ammonium:-nitrit, enthält. Neben dem Nitrisalz kann man dem Elektrolyten kohlensaure Salze beigeben, um hierdurch eine gleichmäßige grüne Patina zu erzielen. Das Resultat kann weiterhin dadurch verbessert werden, daß die zu färbende Metalloberfläche mit aktivierenden Stoffen, z. B. Quecksilberlösungen, vorbehandelt wird. Die Behandlung mit Quecksilberlösungen macht die Metalloberfläche empfänglicher für die Färbung, so daß der Färbvorgang außerordentlich rasch und gleichmäßig vor sich geht. Es sei darauf hingewiesen, daß die Aktivierung der zu färbenden Oberfläche mit Hilfe von Quecksilberlösung nichts mit den bekannten Verfahren zu tun hat, bei denen Quecksilberlösungen durch Bildung von Schwefelquecksilber als Färbmittel selbst dienen.The methods known up to now have the disadvantage, however, that there is the color that can be achieved, both in terms of hue and in terms of uniformity cannot be predicted with certainty. Often there is none at all Coloring takes place, but only etching, or the coloration only occurs in spots. This drawback is remedied according to the present invention in that a Electrolyte is used, the nitrite salts, z. B. sodium nitrite, potassium nitrite, Ammonium: -nitrite, contains. In addition to the nitrate salt, one can add carbonic acid to the electrolyte Add the salts to achieve an even green patina. The result can be further improved by the fact that the metal surface to be colored with activating substances, e.g. B. mercury solutions, is pretreated. The treatment with mercury solutions makes the metal surface more susceptible to coloring, so that the dyeing process proceeds extremely quickly and evenly. Be it pointed out that the activation of the surface to be colored with the help of Mercury solution has nothing to do with the known processes in which mercury solutions serve as a coloring agent by forming sulfur mercury.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED53786D DE500951C (en) | 1927-08-27 | 1927-08-27 | Process for coloring copper and copper alloys by electrolytic means |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DED53786D DE500951C (en) | 1927-08-27 | 1927-08-27 | Process for coloring copper and copper alloys by electrolytic means |
Publications (1)
Publication Number | Publication Date |
---|---|
DE500951C true DE500951C (en) | 1930-06-26 |
Family
ID=7055245
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DED53786D Expired DE500951C (en) | 1927-08-27 | 1927-08-27 | Process for coloring copper and copper alloys by electrolytic means |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE500951C (en) |
-
1927
- 1927-08-27 DE DED53786D patent/DE500951C/en not_active Expired
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