DE663988C - Process for the production of a protective coating on magnesium and its alloys - Google Patents
Process for the production of a protective coating on magnesium and its alloysInfo
- Publication number
- DE663988C DE663988C DEB167319D DEB0167319D DE663988C DE 663988 C DE663988 C DE 663988C DE B167319 D DEB167319 D DE B167319D DE B0167319 D DEB0167319 D DE B0167319D DE 663988 C DE663988 C DE 663988C
- Authority
- DE
- Germany
- Prior art keywords
- magnesium
- alloys
- protective coating
- production
- coating
- 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
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
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 Herstellung eines Schutzüberzuges auf Magnesium und seinen Legierungen Verfahren, Magnesium und Magnesiumlegierungen durch Schutzüberzüge vor dem Korrosionsangriff zu schützen, sind bekannt. Diese Verfahren beruhen entweder auf der Bildung eines oxydischen oder hydroxydischen Niederschlages, der durch Behandlung mit Wasser oder Wasserdampf auch bei über Ioo° oder durch Verwendung von Chemikalien teils in saurer, teils in alkalischer Lösung, wie in Phenol, Fluoriden, Schwermetallsalzen, z. B. Zinn- oder Chromsalzen, oder Ammoniakdämpfen, her vorgerufen wird. Diese Verfahren beeinträchtigen alle das helle, blanke Aussehen des Metalls, sei es durch Bildung eines dicken, weiße Überzuges oder durch Bildung farbiger Überzüge.Process for the production of a protective coating on magnesium and its alloys process, magnesium and magnesium alloys through protective coatings To protect against the corrosive attack are known. These procedures are based on either on the formation of an oxidic or hydroxydic precipitate, which by treatment with water or steam even at over 100 ° or through the use of chemicals partly in acidic, partly in alkaline solution, such as in phenol, fluorides, heavy metal salts, z. B. tin or chromium salts, or ammonia vapors, is called forth. These procedures all affect the bright, shiny appearance of the metal, be it through education a thick, white coating or through the formation of colored coatings.
Gegenstand der Erfindung ist ein Verfahren zur Bildung eines Schutzüberzuges, ohne daß bei Anwendung dieses Verfahrens die helle, blanke Farbe des Metalls verändert wird und ohne daß durch Aufbringen von Schwermetallsalzen die Bildung von Lokalelementen bei Verletzung der Oxydhaut und darauf beschleunigter Korrosion hervorgerufen werden kann.The invention relates to a method for forming a protective coating, without changing the bright, shiny color of the metal when this process is used becomes and without the formation of local elements by the application of heavy metal salts caused by damage to the oxide skin and consequent accelerated corrosion can.
Das Verfahren besteht darin, daß das Magnesium oder seine Legierungen in Kali-oder Natronlauge oder einem Gemisch von beiden gekocht werden. Die Anwendung höherer oder tieferer Temperaturen oder Drucke ist zulässig. Eine zweckmäßige Behandlung ist z. B. das Kochen in 4%iger Natronlge. Wichtig ist die Abwesenheit von Salzen in der Lauge. Am besten wird die Lauge mit destilliertem Wasser hergestellt. Mit steigender Konzentration der Lauge nimmt die Dichte und Porenfreiheit des überzuges zu. Auch höhere Konzentrationen als die 4%ige Lauge können mit Erfolg angewendet werden.The process consists in the magnesium or its alloys boiled in potash or caustic soda or a mixture of both. The application higher or lower temperatures or pressures is permissible. Appropriate treatment is z. B. cooking in 4% sodium bicarbonate. The absence of salts is important in the lye. The lye is best made with distilled water. With with increasing concentration of the lye, the density and freedom from pores of the coating decrease to. Concentrations higher than the 4% lye can also be used with success will.
Die Verwendung von Magnesium und seinen Legierungen wegen der Keimfreiheit und der Resorbierbarkeit des Magnesiums in der Chirurgie ist bekannt. Kocht man Magnesium in Wasser, so wird das Magnesium angegriffen. Weiße Ausblühungen sind unter dem Mikroskop bereits nach ganz kurzem lochen sichtbar. Das Magnesium wird unansehnlich und grau und macht nicht den Eindruck der litzblanken Sauberkeit.The use of magnesium and its alloys because of the sterility and the resorbability of magnesium in surgery is well known. One cooks Magnesium in water, this is how the magnesium is attacked. White efflorescence are visible under the microscope after a very short punch. The magnesium will unsightly and gray and does not give the impression of sparkling cleanliness.
Die Resorption des Magnesiums im Körper ist einem Korrosionsvorgang vergleichbar. Wird das Magnesium bereits durch Kochen im Wasserangegriffen, so wird dadurch die Resorptionszeit verkürzt, ein Vorgang, der bei dünnen Gegenständen aus Magnesium erhebliche Bedeutung hat.The absorption of magnesium in the body is a corrosive process comparable. If the magnesium is already attacked by boiling in water, then this shortens the resorption time, a process that occurs with thin objects Magnesium is of great importance.
Die nach dem neuen Verfahren behandelten Magnesiumgegenstände haben nun den Vorteil, @daß i. sie, in Wasser gekocht, blank aus dem Kochgefäß oder Sterilisator herauskommen und 2. ihre vorzeitige Resorption verhindert wird und daß durch Veränderung der Dichte und Stärke des Überzuges die Resorptionszeit verändert werden kann.The magnesium articles treated according to the new process have now the advantage that i. they, boiled in water, bare from the cooking vessel or sterilizer come out and 2. their premature absorption is prevented and that through change the density and thickness of the coating, the absorption time can be changed.
Bei Verwendung von reinem Magnesium an Stelle von Magnesiumlegierungen bietet das Verfahren den Vorteil, .daß keine anderen Metalle mit dem Magnesium in den Körper hineingelangen und daß die Resorptionsgeschwindigkeit nicht verkürzt wird.When using pure magnesium instead of magnesium alloys the process offers the advantage that no other metals can interact with the magnesium in the body get in and that the rate of resorption is not shortened.
Bei der Resorption des Magnesiums im Körper tritt Gas, wahrscheinlich
Wassersto @fe
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB167319D DE663988C (en) | 1934-10-25 | 1934-10-25 | Process for the production of a protective coating on magnesium and its alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB167319D DE663988C (en) | 1934-10-25 | 1934-10-25 | Process for the production of a protective coating on magnesium and its alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE663988C true DE663988C (en) | 1938-08-18 |
Family
ID=7005851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DEB167319D Expired DE663988C (en) | 1934-10-25 | 1934-10-25 | Process for the production of a protective coating on magnesium and its alloys |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE663988C (en) |
-
1934
- 1934-10-25 DE DEB167319D patent/DE663988C/en not_active Expired
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