DE906878C - Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through process - Google Patents
Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through processInfo
- Publication number
- DE906878C DE906878C DES14665D DES0014665D DE906878C DE 906878 C DE906878 C DE 906878C DE S14665 D DES14665 D DE S14665D DE S0014665 D DES0014665 D DE S0014665D DE 906878 C DE906878 C DE 906878C
- Authority
- DE
- Germany
- Prior art keywords
- aluminum
- pull
- electrolytic oxidation
- aluminum alloys
- alloys
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
Description
Elektrolytische Oxydation von Aluminium und Aluminiumlegierungen, insbesondere im Durchzugsverfahren hie elektrolytische Oxydation von Aluminium oder Aluminiumlegierungen in schwefelsaurer oder oxalsaurer Lösung wird gewöhnlich bei verhältnismäßig niedrigen Temperaturen und Stromdichten von i bis a AM M2 durchgeführt, da bei Temperaturen über .4o° und normaler Behandlungsdauer die Schichten pulvrig und unbrauchbar werden. Auch die Anwendung höherer Stromdichten bei normalen Temperaturen führt nicht zu brauchbaren Ergebnissen. Man erhält meist Anfressungen des Materials.Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through process called electrolytic oxidation of aluminum or aluminum alloys in sulfuric acid or oxalic acid solution is usually carried out at relatively low temperatures and current densities of 1 to a AM M2 , since the layers are at temperatures above .40 ° and normal treatment duration become powdery and unusable. Even the use of higher current densities at normal temperatures does not lead to useful results. You usually get pitting of the material.
Man hat auch versucht, bei Temperaturen von 8o bis 9o2 und Schwefelsäuregehalten von cgo bis i oo o/o zu arbeiten. So hohe Konzentrationen sind aber zu der Erzeugung einer entsprechend starken Schutzschicht nicht geeignet. Das Rücklösungsv ermögen solcher konzentrierten Säure ist so hoch, daß im besten Falle nur ganz dünne Schichten erhalten werden, die bei geringen mechanischen Einwirkungen sofort beschädigt werden.Attempts have also been made at temperatures of 8o to 9o2 and sulfuric acid levels to work from cgo to i oo o / o. However, such high concentrations are involved in the production a suitably thick protective layer is not suitable. Enable the redemption such concentrated acid is so high that in the best case only very thin layers are obtained, which are damaged immediately in the event of minor mechanical effects.
1?s hat sich nun überraschenderweise gezeigt, daß auch mit höheren Stromdichten und bei gleichzeitiger Anwendung höherer Radtemperaturen gearbeitet werden kann, wenn erfindungsgemäß die elektrolytische Oxydation von Aluminium und Aluminiumlegierungen, vorzugsweise von Aluminiumdrähten und Aluminiumbändern im Durchzugsverfahren, in schwefelsauren oder oxalsauren Bädern der üblichen Konzentrationen durchgeführt wird, wobei die elektrolytische Behandlung bei Temperaturen von über 50°1 mit Stromdichten von etwa ioo A/,dm2 oder mehr erfolgt und die Behandlungsdauer höchstens i Minute beträgt. Auf diese Weise werden völlig einwandfreie, gut biegsaure Oxydschichten erhalten. Die Durchzugsgeschwindigkeit beträgt z. B. bei einem Bad von 30 cm Länge für Aluminiumdraht ioo bis 500 m je Stunde, die Stromdichte z2o A/dm2 und die Temperatur des Elektrolyts 6o bis 70°,. Die üblichen Konzentrationen betragen bei Schwefelsäure etwa io bis 30°/o, bei Oxalsäure 2,i/2 bis :2o"/o. Die Schichten weisen eine Dicke von mehreren ,u auf und sind nicht nur sehr gut biegsam; sondern auch gut anfärbbar. Das erfindungsgemäße Verfahren gibt die Möglichkeit, den Durchsatz der Bäder je Zeiteinheit auf mindestens den iofachen Betrag zu erhöhen.1? S has now surprisingly shown that it is also possible to work with higher current densities and at the same time using higher wheel temperatures if, according to the invention, the electrolytic oxidation of aluminum and aluminum alloys, preferably of aluminum wires and aluminum strips, in the pull-through process, in sulfuric acid or oxalic acid baths of the usual concentrations is carried out, the electrolytic treatment being carried out at temperatures of over 50 ° 1 with current densities of about 100 A /, dm2 or more and the treatment duration being at most 1 minute. In this way, completely flawless, highly flexible oxide layers are obtained. The pull-through speed is z. B. in a bath of 30 cm length for aluminum wire 100 to 500 m per hour, the current density z2o A / dm2 and the temperature of the electrolyte 6o to 70 °. The usual concentrations for sulfuric acid are about 10 to 30 per cent, for oxalic acid 2, 1/2 to: 20 "/ 0. The layers are several microns thick and are not only very flexible, but also easy to dye The method according to the invention makes it possible to increase the throughput of the baths per unit of time to at least 10 times the amount.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES14665D DE906878C (en) | 1939-12-21 | 1939-12-21 | Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES14665D DE906878C (en) | 1939-12-21 | 1939-12-21 | Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through process |
Publications (1)
Publication Number | Publication Date |
---|---|
DE906878C true DE906878C (en) | 1954-03-18 |
Family
ID=7474625
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES14665D Expired DE906878C (en) | 1939-12-21 | 1939-12-21 | Electrolytic oxidation of aluminum and aluminum alloys, especially in the pull-through process |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE906878C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2963409A (en) * | 1957-10-07 | 1960-12-06 | Reynolds Metals Co | Flexible anodic coating |
DE1184174B (en) * | 1957-08-12 | 1964-12-23 | Bolam Nominees Ltd | Method and device for anodic treatment of a surface side of a metal strip |
-
1939
- 1939-12-21 DE DES14665D patent/DE906878C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1184174B (en) * | 1957-08-12 | 1964-12-23 | Bolam Nominees Ltd | Method and device for anodic treatment of a surface side of a metal strip |
US2963409A (en) * | 1957-10-07 | 1960-12-06 | Reynolds Metals Co | Flexible anodic coating |
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