DE718254C - Process for pickling magnesium - Google Patents

Process for pickling magnesium

Info

Publication number
DE718254C
DE718254C DEH159349D DEH0159349D DE718254C DE 718254 C DE718254 C DE 718254C DE H159349 D DEH159349 D DE H159349D DE H0159349 D DEH0159349 D DE H0159349D DE 718254 C DE718254 C DE 718254C
Authority
DE
Germany
Prior art keywords
pickling
magnesium
nitric acid
solutions
bichromate
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
DEH159349D
Other languages
German (de)
Inventor
Dr-Ing Walter Heimberger
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.)
WALTER HEIMBERGER DR ING
Original Assignee
WALTER HEIMBERGER DR ING
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 WALTER HEIMBERGER DR ING filed Critical WALTER HEIMBERGER DR ING
Priority to DEH159349D priority Critical patent/DE718254C/en
Application granted granted Critical
Publication of DE718254C publication Critical patent/DE718254C/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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/12—Light metals

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General 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

Verfahren zum Beizen von Magnesium Magnesium nimmt unter den technisch verwendeten Metallen insofern eine Sonderstellung ein, als es so reaktionsfähig ist, daß es beim Eintauchen in Wasser dieses zersetzt.Process for pickling magnesium Magnesium takes among the most technical Metals used have a special position insofar as they are so reactive is that when immersed in water it decomposes it.

Zum Beizen von Magnesium sind deshalb die sonst bei Metallen gebräuchlichen Verfahren nicht anwendbar. Man sucht die Reaktionsfähigkeit zu verringern, indem man in oxydierend wirkendem. Beizlösungen eine Oxyd= schickt auf denn Metall zu erzeugen sucht.For the pickling of magnesium, the ones otherwise used for metals are therefore used Procedure not applicable. One seeks to reduce the ability to react by one in oxidizing. Pickling solutions an Oxyd = sends to the metal generate addiction.

A75 Oxydationsmittel dient in erster Linie Salpetersäure. Bei niedrigen Konzentrationen. ist die Beizwirkung der Salpetersäure gering, erhöht man aber die Konzentration sa weit, daß eine Geizwirkung eintritt, so beschleunigt sich die Reaktion infolge der Bildung von Stickoxyd autokatalytisch so stark, daß es sehr schwer wird, den Vorgang einigermaßen zu beherrschen.A75 oxidizer is primarily used for nitric acid. At low Concentrations. if the pickling effect of nitric acid is low, it is increased Concentration means that avarice occurs, so the reaction is accelerated as a result of the formation of nitrogen oxide, so autocatalytically that it is very difficult to master the process to some extent.

Gemäß Erfindung ist es möglich, Magnesium in einer stark verdünnten Salpetersäure zu beizen, wenn mian der Geizlösung lösliche Phesphatverbindungen oder Phosphorsäure zusetzt. Diese Verbindungen wirken als Bescbleuüiger ohne schädliche Nebenwirkungen. Es wird insbesondere die Ent-wicklung von Stickoxyd verhindert. Sehr ausgedehnte Verwendung haben Sa1-petersäuzebeir,en. gefunden mit einem Zusatz von Alkalibichromaten. Bekannt ist auch ein Zusatz von Nitraten zu solchen Beizlösungmi. Aber auch bei diesen Verfahren sind hohe Konzentrationen erforderlich. Eine weitere Unannehmlichkeit ist der rasche Verbrauch der Lösungen.According to the invention, it is possible to pickle magnesium in a very dilute nitric acid if soluble phosphate compounds or phosphoric acid are added to the pickling solution. These compounds act as bleeding agents with no harmful side effects. In particular, the development of nitrogen oxide is prevented. Sa1-petersäuzebeir, en have very extensive use. found with an addition of alkali dichromates. It is also known to add nitrates to such pickling solutions. But even with these processes, high concentrations are required. Another inconvenience is the rapid consumption of the solutions.

Auch bei Salpebersäurelösungen mit Bichromatzusatz kann bei Verwendung von Phosphorverbindungen die Konzentration der Geizlösung sehr stark verringert werden. Die gewünschte Bichromatschutzschicht bildet sich in einwandfreier Weise aus, wenn man z. B. zu einer a %igen kalt. Salpetersäure r % Alkalibichromat und o,5% Nitrat gibt und o, 5 % Phosphat, z. B. Calciumphosphat.Even with nitric acid solutions with added bichromate, when using of phosphorus compounds greatly reduces the concentration of the mordant solution will. The desired bichromate protective layer is formed perfectly if you z. B. to a% cold. Nitric acid r% alkali dichromate and 0.5% nitrate and 0.5% phosphate, e.g. B. Calcium phosphate.

Claims (1)

PATENTANSPRUCH: Verfahren zum Beizen von Magnesium mit stark verdiinnter kalter Salp.gtersäume, gegebenenfalls mit Zusatz von Bichromat und Nitraten, gekennzeichnet durch die Verwendung von Beizlösungen, die außerdwn noch Phosphorsäure oder ein lösliches Salz dieser Säure enthalten.PATENT CLAIM: Process for pickling magnesium with strongly thinned cold salt fringes, if necessary with the addition of bichromate and nitrates, marked by using pickling solutions that also contain phosphoric acid or a contain soluble salt of this acid.
DEH159349D 1939-04-20 1939-04-20 Process for pickling magnesium Expired DE718254C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEH159349D DE718254C (en) 1939-04-20 1939-04-20 Process for pickling magnesium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEH159349D DE718254C (en) 1939-04-20 1939-04-20 Process for pickling magnesium

Publications (1)

Publication Number Publication Date
DE718254C true DE718254C (en) 1942-03-11

Family

ID=7183003

Family Applications (1)

Application Number Title Priority Date Filing Date
DEH159349D Expired DE718254C (en) 1939-04-20 1939-04-20 Process for pickling magnesium

Country Status (1)

Country Link
DE (1) DE718254C (en)

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