DE600046C - Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys - Google Patents

Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys

Info

Publication number
DE600046C
DE600046C DES93945D DES0093945D DE600046C DE 600046 C DE600046 C DE 600046C DE S93945 D DES93945 D DE S93945D DE S0093945 D DES0093945 D DE S0093945D DE 600046 C DE600046 C DE 600046C
Authority
DE
Germany
Prior art keywords
aluminum
bath
protective coatings
volts
corrosion
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
Application number
DES93945D
Other languages
German (de)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Elektro Osmose GmbH
Original Assignee
Siemens Elektro Osmose GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to BE373447D priority Critical patent/BE373447A/xx
Application filed by Siemens Elektro Osmose GmbH filed Critical Siemens Elektro Osmose GmbH
Priority to DES93945D priority patent/DE600046C/en
Priority to DE1930562615D priority patent/DE562615C/en
Priority to AT133115D priority patent/AT133115B/en
Priority to FR702266D priority patent/FR702266A/en
Priority to US482368A priority patent/US1923539A/en
Priority to GB18313/31A priority patent/GB371213A/en
Priority to DES102384D priority patent/DE606551C/en
Priority to FR42676D priority patent/FR42676E/en
Priority to GB35223/32A priority patent/GB390110A/en
Priority to US646978A priority patent/US1936058A/en
Application granted granted Critical
Publication of DE600046C publication Critical patent/DE600046C/en
Expired legal-status Critical Current

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
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • 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
    • 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
    • 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
    • C25D11/30—Anodisation of magnesium 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)
  • Inorganic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Description

Verfahren zur Herstellung korrosionsbeständiger Schutzüberzüge auf Aluminium-oder Aluminiumlegierungen Es ist bekannt, auf Aluminium oder Aluminiumlegierungen Schutzüberzüge in der Weise herzustellen, daß man die Aluminiumgegenstände in einer wässerigen Lösung gewisser Stoffe der Einwirkung eines elektrischen Stromes aussetzt. So ist beispielsweise vorgeschlagen-worden, Gleichstrom zu verwenden und Lösungen, die ein Gemisch verschiedener Stoffe, z. B. Bleiacetat, Schwefelsäure undKaliumbichromat, enthalten. Bei diesem bekannten Verfahren "bildet sich auf dem anodisch geschalteten Aluminiumgegenstand ein Überzug aus, der weißlich bis grau gefärbt ist. Es ist bei diesem bekannten Verfahren erforderlich, die Lösungen nach erfolgter Herstellung zunächst einen Tag oder länger sich selbst zu überlassen, bevor man die Erzeugung der Schutzüberzüge vornimmt.Process for the production of corrosion-resistant protective coatings Aluminum or aluminum alloys It is known to use aluminum or aluminum alloys Manufacture protective coatings in such a way that the aluminum objects in one exposing an aqueous solution of certain substances to the action of an electric current. For example, it has been proposed to use direct current and solutions which is a mixture of different substances, e.g. B. lead acetate, sulfuric acid and potassium dichromate, contain. In this known method "forms on the anodically connected Aluminum object has a coating that is whitish to gray in color. It is at This known method required the solutions after preparation leave to your own devices for a day or more before starting the generation the protective coatings.

Weiter ist es auch bereits vorgeschlagen worden, chromsäurehaltige Lösungen zur Erzeugung von Schutzüberzügen auf Aluminiumgegenständen zu benutzen. Bei diesem bekannten Verfahren wurden nur verhältnismäßig geringe Konzentrationen - bis zu höchstens 30/, angewendet. Es wurde meist ein Gleichstrom benutzt, jedoch konnte auch ein Wechselstrom Anwendung finden. Indessen ergaben sich auch bei diesem bekannten Verfahren durchweg nur hellfarbige Schutzüberzüge.It has also already been proposed to use chromic acid To use solutions for creating protective coatings on aluminum objects. In this known method, only relatively low concentrations were used - up to a maximum of 30 /, applied. A direct current was mostly used, however an alternating current could also be used. In the meantime, this also resulted known processes consistently only light-colored protective coatings.

Die Erfindung bezweckt, tiefdunkel gefärbte Schutzüberzüge auf Aluminium oder Aluminiumlegierungen mittels Wechselstromes zu erzeugen. Um dies zu erreichen, werden gemäß der Erfindung zwischen ro und 2504 Chromsäure enthaltende Bäder von einer Temperatur von etwa 5o' C und eine Badspannung unterhalb 6o Volt, vorzugsweise zwischen 40 und 5o Volt, angewendet. Es gelingt hierdurch, aus ein und demselben Bad nacheinander praktisch vollkommen gleichgefärbte tiefdunkle Schutzüberzüge auf Aluminium oder Aluminiumlegierungen zu erzeugen, wobei lediglich solche Aluminiumlegierungen, welche über 4°/o Kupfer oder Zink aufweisen, für das neue Verfahren ungeeignet sind. Zweckmäßig wird in der Weise verfahren, daß in bekannter Weise die Badspannung von geringeren Werten bis auf etwa 4o bis 5o Volt gesteigert wird. Man kann dabei die zu überziehenden Gegenstände zunächst an die Wechselspannung anschließen und sie erst darauf in das Chromsäure enthaltende Bad eintauchen. Um die Temperatur bei etwa So' C zu halten, kann man für das Bad eine Kühlvorrichtung vorsehen. Die Badspannung und die Stromdichte hängen ab von der Art der zu überziehenden Aluminiumlegierungen, ebenso wie die Farbnuancen der einzelnen Bleche, die außerdem noch abhängen von der Zusammen-Setzung der verwendeten Legierung. Die zu behandelnden Gegenstände können zur Erhöhung ihrer Korrosionsbeständigkeit nach erfolgter Erzeuggng des Schutzüberzuges in bekannter Weise mit einer weiteren Schutzschicht überzogen werden durch Einreiben mit Fetten, mit Wachs oder Gemischen dieser Stoffe sowie durch Anstrich mit Ölfarbe, Teer oder Asphalt.The invention aims to produce deep dark colored protective coatings on aluminum or aluminum alloys by means of alternating current. In order to achieve this, baths containing chromic acid between ro and 2504 at a temperature of about 50 ° C. and a bath voltage below 60 volts, preferably between 40 and 50 volts, are used according to the invention. This makes it possible to successively produce practically completely uniformly colored, deep-dark protective coatings on aluminum or aluminum alloys from one and the same bath, only those aluminum alloys which contain more than 4% copper or zinc are unsuitable for the new process. It is expedient to proceed in such a way that the bath voltage is increased in a known manner from lower values to about 40 to 50 volts. The objects to be coated can first be connected to the alternating voltage and only then immersed in the bath containing chromic acid. A cooling device can be provided for the bath to keep the temperature at around 50 ° C. The bath voltage and the current density depend on the type of aluminum alloy to be coated, as do the color nuances of the individual sheets, which also depend on the composition of the alloy used. The objects to be treated can be coated in a known manner with a further protective layer to increase their corrosion resistance after the protective coating has been produced, by rubbing in with fats, with wax or mixtures of these substances and by painting with oil paint, tar or asphalt.

Ausführungsbeispiele r. Zwei Reinaluminiumbleche werden mit Hilfe eines Spannungsteilers bei anfänglich geringer Spannung an die Klemmen einer Wechselstromquelle gelegt und in ein auf 5o' erwärmtes Bad von ro°/@ger Chromsäure getaucht. Nachdem die Bleche in das Bad gebracht sind, steigert man die Spannung auf io Volt und im Verlaufe i Stunde allmählich weiter auf 5o Volt. Die Bleche werden hierauf unter Strom aus dem Bad genommen und nach Ausschalten der Stromquelle mit Wasser abgespült und getrocknet. Die Oberfläche der Bleche erscheint tiefdunkelgrau gefärbt.Embodiments r. Two pure aluminum sheets are made with the help a voltage divider at an initially low voltage to the terminals of an alternating current source and immersed in a bath of red chromic acid heated to 50 '. After this the metal sheets have been brought into the bath, the voltage is increased to 10 volts and im Gradually proceed to 50 volts for one hour. The sheets are then under Power is taken from the bathroom and rinsed with water after switching off the power source and dried. The surface of the sheet appears to be colored deep dark gray.

2. Zwei Lautalbleche werden mit einer Wechselspannung von 4o Volt in einem auf 57° erwärmten 25°/jgen Chromsäurebad 2o Minuten lang behandelt. Nach dem Spülen und Trocknen erscheinen die Bleche tiefgrau gefärbt.2. Two loudspeakers are connected to an alternating voltage of 4o volts treated in a 25 ° / jgen chromic acid bath heated to 57 ° for 20 minutes. To After rinsing and drying, the trays appear deep gray.

3. Zwei Duraluminiumplatten werden in einer Lösung, enthaltend io °/o Kaliumpermanganat und io°/o Chromsäure, mit Wechselstrom von 40 Volt bei 5o' 2o Minuten lang behandelt. Die Platten erscheinen nach dem Spülen und Trocknen tiefbraun gefärbt.3. Two duralumin sheets are placed in a solution containing io ° / o potassium permanganate and 10 ° / o chromic acid, with alternating current of 40 volts at 5o ' Treated for 20 minutes. The plates appear deep brown after rinsing and drying colored.

Claims (3)

PATENTANSPRÜCHE- i. Verfahren zur Herstellung korrosionsbeständiger Schutzüberzüge auf Aluminium oder Aluminiumlegierungen mit Hilfe eines chromsäurehaltigen Bades und eines Wechselstromes, dadurch gekennzeichnet, daß zur Erzielung tiefdunkel gefärbter Überzüge io bis 25°/oige chromsäurehaltige Bäder bei einer Temperatur von etwa 50' C und eine Badspannung unterhalb 6o Volt, vorzugsweise zwischen 40 und 50 Volt, verwendet werden. PATENT CLAIMS- i. Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys with the aid of a chromic acid-containing bath and an alternating current, characterized in that, in order to achieve deep-dark colored coatings, io to 25% chromic acid-containing baths at a temperature of about 50 ° C and a bath voltage below 60 volts, preferably between 40 and 50 volts can be used. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daB die Badspannung von geringeren Werten bis auf etwa 4.o bis 50 Volt gesteigert wird. 2. The method according to claim i, characterized in that the bath voltage is increased from lower values up to about 40 to 50 volts. 3. Verfahren nach Anspruch i oder 2, dadurch gekennzeichnet, daB die zu überziehenden Gegenstände erst an die Wechselspannung gelegt und darauf in das Chromsäurebad eingetaucht werden.3. The method according to claim 1 or 2, characterized in that the to be coated Objects first connected to the AC voltage and then immersed in the chromic acid bath will.
DES93945D 1929-09-16 1929-09-16 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys Expired DE600046C (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
BE373447D BE373447A (en) 1929-09-16
DES93945D DE600046C (en) 1929-09-16 1929-09-16 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys
DE1930562615D DE562615C (en) 1929-09-16 1930-07-02 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys with the help of an acidic chromic acid bath
AT133115D AT133115B (en) 1929-09-16 1930-09-11 Process for the production of corrosion-resistant coatings on light metals.
FR702266D FR702266A (en) 1929-09-16 1930-09-15 Process for forming corrosion-resistant protective coatings on light metals
US482368A US1923539A (en) 1929-09-16 1930-09-16 Production of anticorrosive protective coatings on light metals
GB18313/31A GB371213A (en) 1929-09-16 1931-06-24 Improvements in or relating to the production of corrosionresisting coatings on aluminium or aluminium alloys
DES102384D DE606551C (en) 1929-09-16 1931-12-11 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys with the help of an acidic chromic acid bath
FR42676D FR42676E (en) 1929-09-16 1932-12-10 Process for forming corrosion-resistant protective coatings on light metals
GB35223/32A GB390110A (en) 1929-09-16 1932-12-12 Improvements in or relating to the production of corrosion-resisting coatings on aluminium or aluminium alloys
US646978A US1936058A (en) 1929-09-16 1932-12-13 Production of corrosion-resistant coatings on aluminum and aluminum alloys

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DES93945D DE600046C (en) 1929-09-16 1929-09-16 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys
DE562615T 1930-07-02
DE390110X 1931-12-10

Publications (1)

Publication Number Publication Date
DE600046C true DE600046C (en) 1934-07-13

Family

ID=34577269

Family Applications (2)

Application Number Title Priority Date Filing Date
DES93945D Expired DE600046C (en) 1929-09-16 1929-09-16 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys
DE1930562615D Expired DE562615C (en) 1929-09-16 1930-07-02 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys with the help of an acidic chromic acid bath

Family Applications After (1)

Application Number Title Priority Date Filing Date
DE1930562615D Expired DE562615C (en) 1929-09-16 1930-07-02 Process for the production of corrosion-resistant protective coatings on aluminum or aluminum alloys with the help of an acidic chromic acid bath

Country Status (6)

Country Link
US (2) US1923539A (en)
AT (1) AT133115B (en)
BE (1) BE373447A (en)
DE (2) DE600046C (en)
FR (2) FR702266A (en)
GB (2) GB371213A (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL56499C (en) * 1938-09-22
BE466876A (en) * 1939-01-31
US2578400A (en) * 1947-03-29 1951-12-11 Charles C Cohn Method for providing oxide coating on aluminum and its alloys
US2574225A (en) * 1948-07-28 1951-11-06 Benzol Products Company Process for rendering metal surfaces antiseptic and products therefrom
US2700212A (en) * 1948-10-15 1955-01-25 Gen Electric Electrical conductor
US2607825A (en) * 1948-10-20 1952-08-19 Eisler Paul Electric capacitor and method of making it
US2666023A (en) * 1948-12-30 1954-01-12 Siegfried Junghans Anodic coating of aluminum
US2930951A (en) * 1957-07-08 1960-03-29 Gen Electric Electrical capacitor
US3091676A (en) * 1959-12-18 1963-05-28 Arthur H Koster Fluid level control system
US3382160A (en) * 1960-03-31 1968-05-07 Asada Tahei Process for inorganically coloring aluminum
US4104136A (en) * 1974-09-22 1978-08-01 Reynolds Metals Company Process for applying thin molybdenum containing coatings on aluminum for solar energy absorption

Also Published As

Publication number Publication date
AT133115B (en) 1933-05-10
GB390110A (en) 1933-03-30
BE373447A (en)
US1936058A (en) 1933-11-21
US1923539A (en) 1933-08-22
FR42676E (en) 1933-09-01
GB371213A (en) 1932-04-21
FR702266A (en) 1931-04-03
DE562615C (en) 1932-10-27

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