DE1496891B2 - PROCESS FOR THE PRODUCTION OF HARD ANODIC OXIDE COATINGS ON ALUMINUM AND ITS ALLOYS - Google Patents
PROCESS FOR THE PRODUCTION OF HARD ANODIC OXIDE COATINGS ON ALUMINUM AND ITS ALLOYSInfo
- Publication number
- DE1496891B2 DE1496891B2 DE1966L0055257 DEL0055257A DE1496891B2 DE 1496891 B2 DE1496891 B2 DE 1496891B2 DE 1966L0055257 DE1966L0055257 DE 1966L0055257 DE L0055257 A DEL0055257 A DE L0055257A DE 1496891 B2 DE1496891 B2 DE 1496891B2
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- alloys
- production
- anodic oxide
- hard anodic
- 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.)
- Granted
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
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)
- Electroplating And Plating Baths Therefor (AREA)
Description
Die Erfindung betrifft ein Verfahren zum Herstellen von harten anodischen Oxidschichten auf Aluminium und dessen Legierungen in einem 10 bis 100 g/l Amidosulfonsäure, eine anorganische Säure sowie Schwermetallsalz enthaltenden Elektrolyten mittels periodisch unterbrochenen Gleichstroms, periodisch umgepolten Gleichstroms oder Wechselstroms.The invention relates to a method for producing hard anodic oxide layers on aluminum and its alloys in a 10 to 100 g / l amidosulfonic acid, an inorganic acid and heavy metal salt containing electrolytes by means of periodically interrupted direct current, periodically reversed polarity Direct current or alternating current.
Bei einem bekannten Verfahren dieser Gattung (Chem. Zentralblatt 1943/1, S. 209, Ref. über IT-PS 3 88 932) wird die Amidosulfonsäure an Stelle von Schwefelsäure eingesetzt. Dementsprechend sind folglich auch Verfahren zum Herstellen von harten anodischen Oxidschichten auf Aluminium und dessen Legierungen bekannt (Chem. Zentralblatt 1953, S. 1397. Ref. über FR-PS 9 94 340 und 1937/1, S. 2900, Ref. über FR-PS 8 15 231), bei denen ein Elektrolyt mit mehr als 3% Schwefelsäure und Nickel oder Eisen eingesetzt wird. In allen Fällen sind die Oxidschichten hinsichtlich Härte und Korrosionsfestigkeit noch verbesserungsfähig. In a known process of this type (Chem. Zentralblatt 1943/1, p. 209, Ref. Via IT-PS 3 88 932) sulfamic acid is used instead of sulfuric acid. Accordingly, consequently also processes for producing hard anodic oxide layers on aluminum and its alloys known (Chem. Zentralblatt 1953, p. 1397. Ref. on FR-PS 9 94 340 and 1937/1, p. 2900, Ref. on FR-PS 8 15 231), in which an electrolyte with more than 3% sulfuric acid and nickel or iron is used will. In all cases, the oxide layers can still be improved in terms of hardness and corrosion resistance.
Der Erfindung liegt die Aufgabe zugrunde, anzugeben, wie besonders harte und korrosionsfeste Oxidschichten erzeugt werden können.The invention is based on the object of specifying how particularly hard and corrosion-resistant oxide layers are can be generated.
Die Erfindung besteht darin, daß bei dem Verfahren der eingangs genannten Gattung ein Elektrolyt mit einem Gehalt an 50 bis 250 g/l Schwefelsäure und 3 bis 35 g/l Nickel oder Kobalt eingesetzt wird. Vorzugsweise wird ein Elektrolyt mit einem Gehalt an 50 bis 150 g/l Schwefelsäure und 25 bis 35 g/l Nickel oder Kobalt eingesetzt.The invention consists in that in the method of the type mentioned above, an electrolyte with a content of 50 to 250 g / l sulfuric acid and 3 to 35 g / l nickel or cobalt is used. Preferably an electrolyte with a content of 50 to 150 g / l sulfuric acid and 25 to 35 g / l nickel or cobalt used.
Die Erfindung nutzt hierbei die Erkenntnis, daß besonders harte und korrosionsfeste Oxidschichten nurThe invention uses the knowledge that particularly hard and corrosion-resistant oxide layers only
iS bei kombinativer Anwendung von drei Maßnahmen erzielt werden, nämlich wenn erstens Amidosulfonsäure und Schwefelsäure gemeinsam in den angegebenen Konzentrationen sowie zweitens Nickel- oder Kobaltsalze im angegebenen Konzentrationsbereich als Schwermetallsalze eingesetzt werden und drittens der Anodisierstrom zur periodischen Unterbrechung des Schichtwachstums aus einem periodisch unterbrochenen oder umgepolten Gleichstrom oder einem Wechselstrom besteht.iS achieved with the combined use of three measures are, namely if firstly sulfamic acid and sulfuric acid together in the specified Concentrations and, secondly, nickel or cobalt salts in the specified concentration range as Heavy metal salts are used and, thirdly, the anodizing current for the periodic interruption of the Layer growth from a periodically interrupted or reversed direct current or an alternating current consists.
Im Ergebnis sind die durch die Erfindung erreichten Vorteile darin zu sehen, daß auf einfache und zugleich billige Weise besonders harte und korrosionsfeste Oxidschichten erzielt werden.As a result, the advantages achieved by the invention can be seen in the fact that simple and at the same time cheap way particularly hard and corrosion-resistant oxide layers can be achieved.
Das nachfolgende Beispiel verdeutlicht die Erfindung: Eingesetzt wurde ein Elektrolyt mit 50 g/l Amidosulfonsäure, 100 g/l Schwefelsäure und 30 g/1 Nickel. In diesen Elektrolyten wurden für etwa 12 Minuten Aluminiumwerkstücke eingetaucht, wobei letztere für 2 Minuten anodisch, danach für 1 Minute kathodisch, erneut für 2 Minuten anodisch usf. geschaltet wurden. Es ergaben sich sehr harte und korrosionsfeste Oxidschichten auf den Aluminiumwerkstücken. Das gleiche Ergebnis wurde erzielt, wenn mit periodisch, z. B. alle 20 Sekunden für 4 Sekunden unterbrochenem Gleichstrom oder mit Wechselstrom gearbeitet wurde.The following example illustrates the invention: An electrolyte with 50 g / l sulfamic acid was used, 100 g / l sulfuric acid and 30 g / l nickel. They were in this electrolyte for about 12 minutes Aluminum workpieces are immersed, the latter being anodic for 2 minutes, then cathodic again for 1 minute were switched anodically and so on for 2 minutes. Very hard and corrosion-resistant oxide layers resulted on the aluminum workpieces. The same result was achieved when using periodically, e.g. B. all 20 seconds of interrupted direct current or working with alternating current for 4 seconds.
Claims (2)
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1966L0055257 DE1496891B2 (en) | 1966-12-10 | 1966-12-10 | PROCESS FOR THE PRODUCTION OF HARD ANODIC OXIDE COATINGS ON ALUMINUM AND ITS ALLOYS |
| FR130752A FR1546269A (en) | 1966-12-10 | 1967-12-04 | Process for obtaining oxide layers on aluminum and its alloys by anodic oxidation, and electrolyte intended for this application |
| GB5580667A GB1173990A (en) | 1966-12-10 | 1967-12-07 | A Method of Producing Hard Oxide Films on Aluminium and its Alloys by Anodic Oxidation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1966L0055257 DE1496891B2 (en) | 1966-12-10 | 1966-12-10 | PROCESS FOR THE PRODUCTION OF HARD ANODIC OXIDE COATINGS ON ALUMINUM AND ITS ALLOYS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE1496891A1 DE1496891A1 (en) | 1969-08-14 |
| DE1496891B2 true DE1496891B2 (en) | 1976-04-22 |
Family
ID=7276815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1966L0055257 Granted DE1496891B2 (en) | 1966-12-10 | 1966-12-10 | PROCESS FOR THE PRODUCTION OF HARD ANODIC OXIDE COATINGS ON ALUMINUM AND ITS ALLOYS |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE1496891B2 (en) |
| GB (1) | GB1173990A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2004207220A1 (en) * | 2003-01-30 | 2004-08-12 | Kirihata, Takashi | Method for forming anodic oxide coating on surface of aluminum or aluminum alloy |
-
1966
- 1966-12-10 DE DE1966L0055257 patent/DE1496891B2/en active Granted
-
1967
- 1967-12-07 GB GB5580667A patent/GB1173990A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB1173990A (en) | 1969-12-10 |
| DE1496891A1 (en) | 1969-08-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C3 | Grant after two publication steps (3rd publication) | ||
| E77 | Valid patent as to the heymanns-index 1977 | ||
| EHJ | Ceased/non-payment of the annual fee |