DE678119C - Process for producing a colorless oxide layer on aluminum and aluminum alloys - Google Patents

Process for producing a colorless oxide layer on aluminum and aluminum alloys

Info

Publication number
DE678119C
DE678119C DEV33953D DEV0033953D DE678119C DE 678119 C DE678119 C DE 678119C DE V33953 D DEV33953 D DE V33953D DE V0033953 D DEV0033953 D DE V0033953D DE 678119 C DE678119 C DE 678119C
Authority
DE
Germany
Prior art keywords
aluminum
oxide layer
producing
aluminum alloys
colorless oxide
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
DEV33953D
Other languages
German (de)
Inventor
Konrad Geier
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.)
Vereinigte Aluminium Werke AG
Original Assignee
Vereinigte Aluminium Werke AG
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
Application filed by Vereinigte Aluminium Werke AG filed Critical Vereinigte Aluminium Werke AG
Priority to DEV33953D priority Critical patent/DE678119C/en
Application granted granted Critical
Publication of DE678119C publication Critical patent/DE678119C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of aluminium or alloys based thereon
    • C23C22/67—Treatment of aluminium or alloys based thereon with solutions containing hexavalent chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Description

Verfahren zur Erzeugung einer farblosen Oxydschicht auf Aluminium und Aluminiumlegierungen Eines der bekannten Verfahren zur Aufbringung einer Schutzschicht auf Aluminium und Aluminiumlegierungen ohne Amtsendung von elektrischer Energie besteht darin, daß die zu überziehenden Gegenstände aus Aluminium oder Aluminiumlegierungen in eine auf 9o bis ioo'C erhitzte Lösung' von Sog wasserfreiem Natriumcarbonat und 15 g Na-@triumchromat in ioooccm Wasser .getaucht werden. Nach etwa 3 bis 5 Minuten, wenn die Aluminiumoberfläche einen dunkelgrauen Überzu- erhalten hat, werden die Aluminiumteile aus der Lösung genommen, mit klarem Wasser gut gespült und zum Trocknen aufgestellt.Process for producing a colorless oxide layer on aluminum and aluminum alloys One of the known processes for applying a protective layer on aluminum and aluminum alloys without the use of electrical energy consists in that the objects to be coated made of aluminum or aluminum alloys in a solution heated to 90 to 100 ° C. suction of anhydrous sodium carbonate and 1 5 g of Na @ triumchromat be .getaucht ioooccm in water. After about 3 to 5 minutes, when the aluminum surface has become dark gray, the aluminum parts are removed from the solution, rinsed well with clear water and set up to dry.

Ein Nachteil der nach diesem Verfahren aufgebrachten Schichten besteht darin, daß sie eine graue Eigenfarbe besitzen, die das blanke metallische Ansehen der mit ihr bedeckten Metallteile verdeckt und ihnen ein häufig nicht erwünschtes stumpfes Aussehen verleiht.There is a disadvantage of the layers applied by this method in the fact that they have a gray color of their own, the shiny metallic appearance covered with it covered metal parts and often undesirable to them gives a dull appearance.

Erfindungsgemäß kann dieser Nachteil ohne Beeinträchtigung der Schutzwirkung dadurch beseitigt werden, daß man unter Anwendung dieses Verfahrens durch Zugabe von Natriumphosphat farblose, glasklare Oxydschichten erhält, die an Haftfestigkeit und Haltbarkeit den bekannten Otydschichten nicht nachstehen.According to the invention, this disadvantage can be avoided without impairing the protective effect can be eliminated by using this procedure by adding Colorless, crystal-clear oxide layers are obtained from sodium phosphate, which increases the adhesive strength and durability are not inferior to the well-known Otyd layers.

Als Eintauchlösung werden iooo ccm Wasser, 5o g wasserfreies Natriumcarbonat, 15 g Natriumchromat und 309 sekundäres Natriump''hosphat (Na=HPO.I+ i2 H.0) angewendet.As an immersion solution cc of water, 5o g of anhydrous sodium carbonate, 1 5 g sodium chromate and 309 secondary Natriump''hosphat (Na + i2 = HPO.I H.0) iooo be applied.

Beispiel Die finit der farblosen Oxydschicht zu versehenden Gegenstände werden in der beschriebenen Lösung 8 bis io Minuten bei Siedetemperatur behandelt und 5 Minuten lang in fließendem Wasser gewässert. Darauf wird io Minuten in einer Wassergla.slösung gekocht (auf I ooo ccrn H-0 3o ccm Wasserglaslösung von 4o B6). Die Gegenstände werden kurz in kaltem Wasser abgespült und bei zoo bis i 2o° im Trockenschrank i o bis 1.5 Minuten lang getrocknet.EXAMPLE The objects to be provided with the finite colorless oxide layer are treated in the solution described for 8 to 10 minutes at the boiling point and soaked in running water for 5 minutes. It is boiled for io minutes in a Wassergla.slösung (on I ooo CCRN H-0 3o cc of water glass solution of 4o B6). The objects are rinsed briefly in cold water and dried at zoo to 120 ° in a drying cabinet for 10 to 1.5 minutes.

Der Zusatz der Wasserglaslösung geschieht zur wesentlichen Verbesserung der chemischen Eigenschaften der Schutzschicht und ist bereits bekannt.The addition of the water glass solution is done for a significant improvement the chemical properties of the protective layer and is already known.

Claims (1)

i ATENTAN'SPR11Cfi: Verfahren zur Erzeugung einer farblosen Oxydsehicht auf Aluminium und Aluminiumlegierungen ohne Anwendung von elektrischem Strom, dadurch Bekennzeichnet, daß man die Oberfläche mit einer wäßrigen Lösung behandelt, die 5o g wasserfreies Natriumoarbonat, 159 Natriumchrömat und 309 sekundäres Natriumphosphat im Liter enthält.i ATENTAN'SPR11Cfi: Process for the production of a colorless oxide layer on aluminum and aluminum alloys without the application of electric current, characterized in that the surface is treated with an aqueous solution containing 50 g anhydrous sodium carbonate, 159 sodium chromate and 309 secondary sodium phosphate per liter.
DEV33953D 1937-06-27 1937-06-27 Process for producing a colorless oxide layer on aluminum and aluminum alloys Expired DE678119C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEV33953D DE678119C (en) 1937-06-27 1937-06-27 Process for producing a colorless oxide layer on aluminum and aluminum alloys

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEV33953D DE678119C (en) 1937-06-27 1937-06-27 Process for producing a colorless oxide layer on aluminum and aluminum alloys

Publications (1)

Publication Number Publication Date
DE678119C true DE678119C (en) 1939-07-08

Family

ID=7588516

Family Applications (1)

Application Number Title Priority Date Filing Date
DEV33953D Expired DE678119C (en) 1937-06-27 1937-06-27 Process for producing a colorless oxide layer on aluminum and aluminum alloys

Country Status (1)

Country Link
DE (1) DE678119C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1290787B (en) * 1960-02-13 1969-03-13 Knapsack Ag Process to prevent corrosion and the formation of deposits in cooling and heating systems with aqueous media
US3989550A (en) * 1975-04-21 1976-11-02 Amchem Products, Inc. Method of forming a hydrophilic coating on an aluminum surface

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1290787B (en) * 1960-02-13 1969-03-13 Knapsack Ag Process to prevent corrosion and the formation of deposits in cooling and heating systems with aqueous media
US3989550A (en) * 1975-04-21 1976-11-02 Amchem Products, Inc. Method of forming a hydrophilic coating on an aluminum surface

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