DE413875C - Process for the production of coatings on aluminum or aluminum alloys by oxidation - Google Patents
Process for the production of coatings on aluminum or aluminum alloys by oxidationInfo
- Publication number
- DE413875C DE413875C DEB114881D DEB0114881D DE413875C DE 413875 C DE413875 C DE 413875C DE B114881 D DEB114881 D DE B114881D DE B0114881 D DEB0114881 D DE B0114881D DE 413875 C DE413875 C DE 413875C
- Authority
- DE
- Germany
- Prior art keywords
- chromic acid
- bath
- aluminum
- minutes
- anode
- 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
- C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
- C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
-
- 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
- C25D11/243—Chemical after-treatment using organic dyestuffs
Description
Gegenstand der Erfindung ist ein Verfahren zur Herstellung widerstandsfähiger Überzüge auf einer Oberfläche aus Aluminium oder Aluminiumlegierungen durch Oxydation. Das Verfahren besteht darin, daß das Metall als Anode in einem elektrolytisch en Bad behandelt wird.The invention relates to a method for the production of resistant coatings on a surface made of aluminum or Aluminum alloys by oxidation. The method is that the metal as Anode is treated in an electrolytic bath.
Gemäß der Erfindung enthält der Elektrolyt Chromsäure oder irgendeinen Stoff,, der an einer Anode Chromsäure bilden kann, z. B. ein Chromat oder ein Bichromat.According to the invention, the electrolyte contains chromic acid or some other substance can form chromic acid at an anode, e.g. B. a chromate or a bichromate.
Die Konzentrations- und Temperaturbedingungen können verändert werden, je nachdem Aluminium selbst oder irgendeine bestimmte Aluminiumlegierung behandelt wird. Bei Anwendung des unter der Bezeichnung »Duralumin« bekannten Metalls oder des handelsüblichen Aluminiumblechs erzielt man nach den folgenden Vorschriften gemäß den Versuchen der Erfinder die besten Ergebnisse. Der Gegenstand wird zunächst mit einem Lösungsmittel für Fett und dann mit heißem Wasser gewaschen. Er wird dann als Anode in ein Bad gebracht, das aus einer wäßrigen Lösung von Chromsäure von 3 Prozent Stärke, auf CrO3 berechnet, besteht und frei von Schwefelsäure und Sulfaten sein muß. Die Kathode kann aus Kohlenstoff bestehen. Die eingetauchte Oberfläche muß vollständig aus Aluminium oder Aluminiumlegierung bestehen, und die elektrischen Verbindungen werden so hergestellt, daß kein anderes Metall in das Bad eintaucht. Erforderlichenfalls kann man den Gegenstand teilweise eintauchen und behandeln und dann umdrehen, so daß alsdann der übrige Teil der Oberfläche eingetaucht und behandelt wird.The concentration and temperature conditions can be varied as the aluminum itself or any particular aluminum alloy is treated. When using the metal known under the name "duralumin" or the commercially available aluminum sheet, the best results are achieved according to the following instructions according to the experiments of the inventors. The object is washed first with a solvent for fat and then with hot water. It is then placed as an anode in a bath which consists of an aqueous solution of chromic acid of 3 percent strength, calculated on CrO 3 , and which must be free of sulfuric acid and sulfates. The cathode can be made of carbon. The immersed surface must be made entirely of aluminum or aluminum alloy, and the electrical connections are made so that no other metal is immersed in the bath. If necessary, the object can be partially immersed and treated and then turned over so that the remainder of the surface is then immersed and treated.
Die Temperatur des Bades wird auf mindestens 400 C gehalten, und die Masse kann während der Behandlung durchgerührt werden. Die Spannung muß sorgfältig unter Anpassung an die anderen Bedingungen geregelt werden. Wenn letztere die bereits genannten sind, so hat sich folgende Arbeitsweise als geeignet erwiesen. Die Badspannung wird allmählich innerhalb 15 Minuten auf 40 Volt gesteigert, 3 5 Minuten lang bei 40 Volt gehalten, dann innerhalb 5 Minuten au'f 50 Volt gesteigert und 5 Minuten lang auf diesem Wert gehalten. Der Gegenstand wird dann gewaschen und getrocknet.The temperature of the bath is kept at at least 40 ° C., and the mass can be stirred through during the treatment. The voltage must be carefully controlled to match the other conditions. If the latter are those already mentioned, the following procedure has proven to be suitable. The bath voltage is gradually increased to 40 volts over the course of 15 minutes, held at 40 volts for 35 minutes, then increased to 50 volts over the course of 5 minutes and held at this value for 5 minutes. The article is then washed and dried.
Der gemäß der Erfindung erhaltene Überzug ist äußerst gleichförmig und dicker als die nach anderen Verfahren erhaltenen Überzüge. Infolgedessen sind die überzogenen Gegenstände, wenn man sie vollständig in Flüssigkeiten, wie Seewasser, eintaucht, sehr lange Zeit widerstandsfähig gegen Durchlöcherung und andere Arten des Angriffs.The coating obtained according to the invention is extremely uniform and thicker than the coatings obtained by other processes. As a result, the ones are overdone Objects, if completely immersed in liquids such as seawater, very much Resistant to perforation and other types of attack for a long time.
Die Widerstandsfähigkeit wird sehr vermehrt, wenn Hie überzogene Oberfläche gefettet oder geölt wird. Der Überzug hat nämlich ein groBes Adsorptionsvermogen, und das Fett dringt in die Oberfläche ein. Aus diesem Grunde ist die überzogene Oberfläche sehr geeignet, um mit Ölfarbe angestrichen zu werden, weil das Öl der Farbe adsorbiert wird. Ein zur Behandlung der überzogenen ίο Oberfläche geeignetes Fett ist Lanolin, das in flüssiger Form, in Lösung oder als Emulsion angewendet werden kann.Resistance is greatly increased if the coated surface is greased or is oiled. Namely, the coating has a large adsorptive power, and the fat penetrates the surface. It is for this reason that the coated surface is very suitable to be painted with oil paint, because the oil of the paint adsorbs will. A fat suitable for treating the coated surface is lanolin, which is found in liquid form, in solution or as an emulsion can be used.
Claims (7)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB19838/23A GB223994A (en) | 1923-08-02 | 1923-08-02 | Improved process of protecting surfaces of aluminium of aluminium alloys |
Publications (1)
Publication Number | Publication Date |
---|---|
DE413875C true DE413875C (en) | 1925-05-18 |
Family
ID=10136061
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB114882D Expired DE413876C (en) | 1923-08-02 | 1924-07-16 | Process for coloring surfaces made of aluminum or aluminum alloys |
DEB114881D Expired DE413875C (en) | 1923-08-02 | 1924-07-16 | Process for the production of coatings on aluminum or aluminum alloys by oxidation |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB114882D Expired DE413876C (en) | 1923-08-02 | 1924-07-16 | Process for coloring surfaces made of aluminum or aluminum alloys |
Country Status (4)
Country | Link |
---|---|
US (1) | US1771910A (en) |
DE (2) | DE413876C (en) |
FR (1) | FR583844A (en) |
GB (1) | GB223994A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE868821C (en) * | 1942-06-24 | 1953-02-26 | Wilhelm Rost | Process for embedding organic or inorganic substances in anodically generated oxide layers on aluminum and aluminum alloys |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA528711A (en) * | 1953-03-13 | 1956-08-07 | Armco Steel Corporation | Process of retarding corrosion of coated metal articles |
US2788317A (en) * | 1954-02-25 | 1957-04-09 | Koenig And Pope | Aluminum and process applicable thereto |
US3020219A (en) * | 1959-01-12 | 1962-02-06 | Electralab Printed Electronics | Process for producing oxide coatings on high silicon aluminum alloy |
FR1399797A (en) * | 1963-05-04 | 1965-05-21 | Aluminium Francais | Improvements to the anodic oxidation of aluminum and its alloys |
US3468988A (en) * | 1965-01-21 | 1969-09-23 | Intern Concrete Systems Co | Method of forming concrete structures with treated form panels |
US4397716A (en) * | 1982-04-09 | 1983-08-09 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Variable anodic thermal control coating |
CH689395A5 (en) * | 1995-03-16 | 1999-03-31 | Alusuisse Lonza Services Ag | Process for the continuous anodic oxidation of strip or wire of aluminum. |
IT1393140B1 (en) * | 2009-03-17 | 2012-04-11 | Nuovo Pignone Spa | METHOD OF PRODUCTION OF A PROTECTIVE COATING FOR A COMPONENT OF A TURBOMACCHINA, THE SAME COMPONENT AND THE RELATED MACHINE |
-
1923
- 1923-08-02 GB GB19838/23A patent/GB223994A/en not_active Expired
-
1924
- 1924-07-16 DE DEB114882D patent/DE413876C/en not_active Expired
- 1924-07-16 DE DEB114881D patent/DE413875C/en not_active Expired
- 1924-07-18 FR FR583844D patent/FR583844A/en not_active Expired
- 1924-07-28 US US728765A patent/US1771910A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE868821C (en) * | 1942-06-24 | 1953-02-26 | Wilhelm Rost | Process for embedding organic or inorganic substances in anodically generated oxide layers on aluminum and aluminum alloys |
Also Published As
Publication number | Publication date |
---|---|
DE413876C (en) | 1925-05-18 |
FR583844A (en) | 1925-01-22 |
GB223994A (en) | 1924-11-03 |
US1771910A (en) | 1930-07-29 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE655700C (en) | Process for the production of opaque, enamel-like protective layers on aluminum and its alloys | |
DE413875C (en) | Process for the production of coatings on aluminum or aluminum alloys by oxidation | |
DE1004012B (en) | Process for the continuous electrolytic phosphating of steel products | |
DE600046C (en) | Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys | |
DE860306C (en) | Process to increase the corrosion resistance of iron and steel and / or the adhesion of paints to these metals | |
DE2628341A1 (en) | METHOD OF GALVANIZING FASTENERS | |
DE1263450B (en) | Phosphating bath and process for phosphating metal surfaces | |
EP0249206A2 (en) | Process for obtaining chromate coatings | |
DE2017865A1 (en) | Process for increasing the corrosion resistance of metals coated with transducers. Arun: Pennwalt Corp., Philadelphia, Pa. (V.St.A.) | |
DE712877C (en) | Process for the production of black-colored, corrosion-resistant protective layers on the surface of objects made of aluminum or aluminum alloys | |
DE3118794A1 (en) | METHOD FOR TREATING THE SURFACE OF ZINC, CADMIUM AND ITS ALLOYS | |
DE615911C (en) | Process for the production of protective coatings on zinc and galvanized objects | |
DE671978C (en) | Process for the electrolytic production of protective coatings on workpieces made of magnesium and its alloys | |
DE2049796A1 (en) | Process for applying coatings to aluminum | |
DE883382C (en) | Process for coating zinc with a protective coating | |
DE2637066C2 (en) | Process for applying a coating to a workpiece made of steel | |
DE973243C (en) | Bath and method for producing a shiny surface on objects made of aluminum or aluminum alloys | |
DE502864C (en) | Process for the production of coatings from emulsions | |
DE564483C (en) | Process for coloring metal alloys | |
DE747429C (en) | Process for the aftertreatment of tanned fur skins | |
DE882178C (en) | Process for the black coloring of objects made of aluminum and its alloys | |
DE683289C (en) | Process for the electrolytic surface finishing of aluminum, aluminum alloys and similar light metals | |
AT404364B (en) | Method of producing a coating on porous sintered metal parts | |
DE492707C (en) | Process for the production of metal coatings on objects made of aluminum and magnesium-free aluminum alloys | |
DE1621499B2 (en) | PROCESS FOR PRODUCING A PROTECTIVE LAYER ON STEEL BY TREATING WITH AN AQUATIC ALKALINE SOLUTION |