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DE1043012B - Protective layer for the shipment of aluminum castings - Google Patents

Protective layer for the shipment of aluminum castings

Info

Publication number
DE1043012B
DE1043012B DEK31039A DEK0031039A DE1043012B DE 1043012 B DE1043012 B DE 1043012B DE K31039 A DEK31039 A DE K31039A DE K0031039 A DEK0031039 A DE K0031039A DE 1043012 B DE1043012 B DE 1043012B
Authority
DE
Germany
Prior art keywords
aluminum
protective layer
shipment
aluminum castings
castings
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.)
Pending
Application number
DEK31039A
Other languages
German (de)
Inventor
Dipl-Ing Fritz Hage
Dipl-Chem Joh Brandis
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.)
KLOTH SENKING AG EISEN und MET
Original Assignee
KLOTH SENKING AG EISEN und MET
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 KLOTH SENKING AG EISEN und MET filed Critical KLOTH SENKING AG EISEN und MET
Priority to DEK31039A priority Critical patent/DE1043012B/en
Publication of DE1043012B publication Critical patent/DE1043012B/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Description

Schutzschicht für den Versand von Aluminiumgußstücken Der Gegenstand der Erfindung bezieht sich auf Aluminiumhalbfabrikate, die an die Hersteller von irgendwelchen Geräten aus Aluminium versandt werden. Die Abnehmer dieser Halbfabrikate legen größten Wert darauf, daß das ihnen zugesandte Halbfabrikat eine möglichst saubere, silbrige und einwandfreie Oberfläche besitzt.Protective layer for the shipment of aluminum castings The object The invention relates to aluminum semi-finished products that are sold to manufacturers of any aluminum devices. The buyers of these semi-finished products attach great importance to the fact that the semifinished product sent to them is as good as possible has a clean, silvery and flawless surface.

Bisher wurden diese Teile aus Aluminium bei der Gießerei entsprechend gebeizt und in einwandfreiem Zustand zum Versand gebracht. Es läßt sich aber nicht vermeiden, daß beim Versand die schön aussehende Oberfläche z. B. dieser Aluminiumgußstücke beschädigt wird, so daß unter Umständen die Teile beanstandet werden.So far, these parts were made of aluminum at the foundry accordingly pickled and shipped in perfect condition. But it cannot be done avoid that the beautiful-looking surface z. B. these aluminum castings is damaged, so that the parts may be complained about.

Eine besonders gute Schutzschicht erhält man bei Aluminiumgußstücken dann, wenn man eine Legierung verwendet, die aus 7 bis 100/, Magnesium, 1,6 bis 30/" vorzugsweise 2 "/o Silizium, Rest Aluminium besteht und die mit dieser Legierung hergestellten Aluminiumgußstücke in bekannter Weise mit Natronlauge beizt.A particularly good protective layer is obtained with aluminum castings if an alloy is used which consists of 7 to 100 /, magnesium, 1.6 to 30 / " preferably 2" / o silicon, the remainder aluminum and the aluminum castings made with this alloy in known way to pickle with caustic soda.

Verwendet man die vorgeschlagene Legierung, so wird durch die Behandlung mit Natronlauge eine Schicht auf dem Aluminiumgegenstand erzeugt, deren Hauptbestandteil nicht mehr das Aluminium ist, sondern ein bzw. mehrere bei der nachfolgenden Behandlung mit Salpetersäure leicht ablösbare Bestandteile.If the proposed alloy is used, the treatment With caustic soda, a layer is created on the aluminum object, its main component is no longer the aluminum, but one or more in the subsequent treatment Components easily removable with nitric acid.

Durch die Behandlung mit Natronlauge wird aus der Oberfläche des Aluminiumgegenstandes das Aluminium herausgelöst, so daß die Oberfläche jetzt mit einer Deckschicht aus Magnesiumsilizid versehen ist. Diese Deckschicht aus Magnesiumsilizid bildet erfindungsgemäß einen festen Schutzüberzug auf dem Aluminiumgußstück, so daß man dieses ohne Beschädigung der Oberfläche versenden kann. Der Abnehmer der mit dieser Deckschicht ausgestatteten Aluminiumgußstücke hat jetzt nur noch notwendig, diese Aluminiumgußstücke mit Salpetersäure weiterzubehandeln. Diese Schutzschicht aus Magnesiumsilizid setzt sich chemisch mit der Salpetersäure um, und es entsteht ein Aluminiumgußstück mit einer regelmäßigen, silbrigen und haltbaren Oberfläche. Die Erzielung einer sauberen, silberähnlichen Oberfläche ist aber nicht Gegenstand dieser Erfindung.Treatment with caustic soda turns the surface of the aluminum object the aluminum dissolved out so that the surface is now covered with a topcoat Magnesium silicide is provided. This top layer of magnesium silicide forms according to the invention a solid protective coating on the aluminum casting, so that it can be seen without damage the surface can send. The buyer of those equipped with this top layer Aluminum castings now only need these aluminum castings with nitric acid to be treated further. This protective layer of magnesium silicide is chemically deposited with the nitric acid, and the result is an aluminum casting with a regular, silvery and durable surface. Achieving a clean, silver-like However, the surface is not the subject of this invention.

Claims (1)

PATENTANSPRUCH: Verwendung einer bei dem bekannten zweistufigen Beizverfahren mittels Natronlauge und Salpetersäure auf Aluminiumgußstücken aus 7 bis 100/, Mg und 1,6 bis 3 °/o Si, Rest Aluminium, nach der ersten Behandlungsstufe entstehenden, festhaftenden Magnesium-Silizid-Schicht als Schutzschicht bei Versand dieser Gegenstände. In Betracht gezogene Druckschriften: Österreichische Patentschrift Nr. 145499; französische Patentschrift Nr. 737939; britische Patentschrift Nr. 367 831; Otto Vogel, »Handbuch der Metallbeizereicc, Bd.I, 1951, S. 297.PATENT CLAIM: Use of a well-known two-stage pickling process by means of sodium hydroxide and nitric acid on aluminum castings made of 7 to 100 % Mg and 1.6 to 3% Si, the remainder being aluminum, as a protective layer after the first treatment stage when shipping these items. Documents considered: Austrian Patent No. 145499; French Patent No. 737939; British Patent No. 367,831; Otto Vogel, »Handbuch der Metallbeizereicc, Vol. I, 1951, p. 297.
DEK31039A 1957-02-05 1957-02-05 Protective layer for the shipment of aluminum castings Pending DE1043012B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK31039A DE1043012B (en) 1957-02-05 1957-02-05 Protective layer for the shipment of aluminum castings

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK31039A DE1043012B (en) 1957-02-05 1957-02-05 Protective layer for the shipment of aluminum castings

Publications (1)

Publication Number Publication Date
DE1043012B true DE1043012B (en) 1958-11-06

Family

ID=7219030

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK31039A Pending DE1043012B (en) 1957-02-05 1957-02-05 Protective layer for the shipment of aluminum castings

Country Status (1)

Country Link
DE (1) DE1043012B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB367831A (en) * 1929-12-04 1932-02-22 Metallgesellschaft Ag Process for improving aluminium alloys which are resistant to corrosion by seawater
FR737939A (en) * 1931-09-25 1932-12-19 Alsthom Cgee New ammeter protection relays for alternating current electrical devices
AT145499B (en) * 1934-05-04 1936-04-25 Ig Farbenindustrie Ag Aluminum alloys with a dense cast structure and high heat resistance.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB367831A (en) * 1929-12-04 1932-02-22 Metallgesellschaft Ag Process for improving aluminium alloys which are resistant to corrosion by seawater
FR737939A (en) * 1931-09-25 1932-12-19 Alsthom Cgee New ammeter protection relays for alternating current electrical devices
AT145499B (en) * 1934-05-04 1936-04-25 Ig Farbenindustrie Ag Aluminum alloys with a dense cast structure and high heat resistance.

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