DE746469C - Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys - Google Patents

Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys

Info

Publication number
DE746469C
DE746469C DEI66265D DEI0066265D DE746469C DE 746469 C DE746469 C DE 746469C DE I66265 D DEI66265 D DE I66265D DE I0066265 D DEI0066265 D DE I0066265D DE 746469 C DE746469 C DE 746469C
Authority
DE
Germany
Prior art keywords
aluminum
holding devices
iron
production
protective layers
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
DEI66265D
Other languages
German (de)
Inventor
Fritz Henneberger
Dr-Ing Josef Martin Michel
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.)
IG Farbenindustrie AG
Original Assignee
IG Farbenindustrie 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 IG Farbenindustrie AG filed Critical IG Farbenindustrie AG
Priority to DEI66265D priority Critical patent/DE746469C/en
Application granted granted Critical
Publication of DE746469C publication Critical patent/DE746469C/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

Description

Verwendung von Haltevorrichtungen aus Eisen oder Edelstählen zur Erzeugung von anodischen Schutzschichten auf Werkstücken aus Aluminium oder Aluminiumlegierungen Bei .der Erzeugung von Schutzschichten auf Leichtmetallen, insbesondere Aluminium und Alumini.u.mlegierungen; durch anodisehe Oxydation wird der zu behandelnde Gegenstand vermittels einer Haltevorrichtung, beispielsweise Federn, Klammern oder Bügel, in das Bad eingehängt, wobei die Stromzuführung zu dem anodisch geschalteten Werkstück über die Haltevorrichtungen erfolgt. Diese letzteren müssen, um eine Korrosion durch die aus sauren wäßrigenLösungenbestehendenElektrolyte zu vermeiden und einen gleichmäßigen Stromübergang zu gewährleisten, aus dergleichen Legierung oder doch wenigstens aus einer Legierung des gleichen Grundmetalls bestehen, aus der bzw. dem das zu behandelnde Werkstück selbst besteht. Soweit die Haltevorrichtungen in dien Elektrolyten eintauchen, bedecken sie sich während der Oberflächenbehandlung infolgedessen ebenfalls -mit einem nicht leitenden Überzug, so daß vor einer erneuten Verwendung die Federn, Klammern oder Bügel auf chemischem oder mechanischem Wege wieder blank, d. h. also metallisch leitend, gemacht werden müssen.Use of holding devices made of iron or stainless steel for production of anodic protective layers on workpieces made of aluminum or aluminum alloys When producing protective layers on light metals, especially aluminum and aluminum and alloys; the object to be treated becomes through anodic oxidation by means of a holding device, for example springs, clips or brackets, in the bath is suspended, the power supply to the anodically connected workpiece takes place via the holding devices. The latter must in order to cause corrosion to avoid the electrolytes consisting of acidic aqueous solutions and a uniform To ensure current transfer, from the same alloy or at least from an alloy of the same base metal as the one to be treated Workpiece itself. As far as the holding devices are immersed in the electrolyte, As a result, they also cover each other with during the surface treatment a non-conductive coating so that the springs, Clamps or stirrups bare again by chemical or mechanical means, d. H. so metallically conductive, must be made.

Nach einem neuerdings bekanntgewordenen Verfahren lassen sich durch a.nocli,selie Behandlung Schutzschichten -auf Werkstück aus Leichtmetallen, ,insbesondere Al-uminiuir#@ und Aluminiumlegierungen, auch mit Hilf von Elektrolyten erzeugen, die aus solchen Lösungen von Säuren, z. B. Oxalsäure, oder sauren Salzen bestehen, bei denen als Lösungsmittel wasserfreieAlkohol.e verwendet werden. Gemäß Erfindung werden nun bei .der Erzeugung von Schutzschichten auf Werkstücken aus Aluminium oder Aluminiumlegierungen unter Verwendung von Elektrolyten der genannten Art Haltevorrichtungen aus Eisen oder Edelstählen verwendet. Es wurde nämlich beobachtet, daß auf solchen Haltevorrichtungen die Abscheidung einer Schicht auf dem in den Elektrolyten eintauchenden Teil derselben praktilsch unterbleibt, ohne daß Korrosionserscheinungen auftreten oder der Stromühergäng zu dein zu behandelnden Werkstück leidet; die sonst erforderliche lästige und umständliche Entfernung der auf .der Haltevorrichtung gebildeten Schicht nach ihrer jeweiligen Benutzung kommt also damit in Fortfall.According to a method that has recently become known, a.nocli, selie treatment of protective layers -on workpiece made of light metals, in particular Al-uminiuir # @ and aluminum alloys, also produced with the help of electrolytes, from such solutions of acids, e.g. B. oxalic acid, or acidic salts, in which anhydrous alcohol is used as the solvent. According to Invention are now at. The production of protective layers on workpieces Aluminum or aluminum alloys using electrolytes of the aforesaid Kind of holding devices made of iron or stainless steels are used. It was observed that that on such holding devices the deposition of a layer on the in the Electrolyte-immersed part of the same is practically omitted without any signs of corrosion occur or the current flow to the workpiece to be treated suffers; the other necessary annoying and cumbersome removal of the .der holding device The layer formed after its respective use is therefore no longer applicable.

Claims (1)

PATENTANSPRUCH; Die Verwendung von Haltevorrichtungen aus Eisen oder Edelstählen zur Erzeugun- von auf \Verkstücken aus Aluminium oder Aluminiumlegierungen durch anodische Behandlung mit Hilfe von Elektrolyten, die aus praktisch wasserfreien alkoholischen Lösungen von Säuren oder sauren Salzen bestehen. Zur Abgrenzung des Anmeldungsgegenstandes vom Stand der Technik sind im Erteilungsverfahren folgende Druckschriften in Betracht gezogen worden: deutsche Patentseliriftett .... Nr. 663 910, 672 523, 682 736.PATENT CLAIM; The use of holding devices made of iron or stainless steels for the production of pieces of aluminum or aluminum alloys by anodic treatment with the aid of electrolytes consisting of practically anhydrous alcoholic solutions of acids or acidic salts. In order to distinguish the subject of the application from the state of the art, the following publications were taken into account in the granting procedure: Deutsche Patentseliriftett .... No. 663 910, 672 5 2 3, 682 736.
DEI66265D 1940-01-09 1940-01-10 Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys Expired DE746469C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEI66265D DE746469C (en) 1940-01-09 1940-01-10 Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE228944X 1940-01-09
DEI66265D DE746469C (en) 1940-01-09 1940-01-10 Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys

Publications (1)

Publication Number Publication Date
DE746469C true DE746469C (en) 1944-08-05

Family

ID=25764434

Family Applications (1)

Application Number Title Priority Date Filing Date
DEI66265D Expired DE746469C (en) 1940-01-09 1940-01-10 Use of holding devices made of iron or stainless steel for the production of anodic protective layers on workpieces made of aluminum or aluminum alloys

Country Status (1)

Country Link
DE (1) DE746469C (en)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE663910C (en) * 1936-11-10 1938-08-16 Langbein Pfanhauser Werke Akt Manufacture of protective coatings on objects plated with aluminum or aluminum alloys
DE672523C (en) * 1936-09-26 1939-03-03 I G Farbenindustrie Akt Ges Process for the production of corrosion-preventing oxide layers on light metals and light metal alloys

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE672523C (en) * 1936-09-26 1939-03-03 I G Farbenindustrie Akt Ges Process for the production of corrosion-preventing oxide layers on light metals and light metal alloys
DE682736C (en) * 1936-09-26 1939-10-21 I G Farbenindustrie Akt Ges Process to increase the corrosion resistance of workpieces made of light metals and their alloys through anodic oxidation
DE663910C (en) * 1936-11-10 1938-08-16 Langbein Pfanhauser Werke Akt Manufacture of protective coatings on objects plated with aluminum or aluminum alloys

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