DE540947C - Fused salt baths for the heat treatment of magnesium and magnesium alloys - Google Patents
Fused salt baths for the heat treatment of magnesium and magnesium alloysInfo
- Publication number
- DE540947C DE540947C DE1930540947D DE540947DD DE540947C DE 540947 C DE540947 C DE 540947C DE 1930540947 D DE1930540947 D DE 1930540947D DE 540947D D DE540947D D DE 540947DD DE 540947 C DE540947 C DE 540947C
- Authority
- DE
- Germany
- Prior art keywords
- magnesium
- salt baths
- molten salt
- heat treatment
- alloys
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Dental Preparations (AREA)
Description
Salzschmelzbäder für die Wärmebehandlung von Magnesium und Magnesiumlegierungen Für die Herstellung von Salzschmelzbädern für die Wärmebehandlung von Magnesium und Magnesiumlegierungen bei Temperaturen oberhalb 3oo' sind keine geeigneten Stoffe bekannt, so daß man bisher für die Wärmebehandlung auf die übliche Glühung im Ofen zurückgreifen mußte.Molten salt baths for the heat treatment of magnesium and magnesium alloys For the production of molten salt baths for the heat treatment of magnesium and magnesium alloys at temperatures above 300 'are not suitable substances known, so that one has hitherto used the usual annealing in the furnace for the heat treatment had to resort to.
Es wurde nun gefunden, daß die Pyrosulfate der Alkalien, insonderheit das lialiumsalz, sich ausgezeichnet für diesen Zweck eignen. Sie sind in dem in Frage kommenden Temperaturgebiet nicht nur außerordentlich dünnflüssig, sondern auch spezifisch so leicht, daß die meisten Magnesiumlegierungen fast ganz darin untertauchen. Weiterhin sind sie bis zu sehr hohen Wärmegraden (Rotglut) beständig und zeigen keinerlei Zersetzungserscheinungen. Hinzu kommt die für die Verwendung ausschlaggebende und überraschende Eigenschaft, daß sie Magne7 sium und Magnesiumlegierungen praktisch nicht angreifen.It has now been found that the pyrosulphates of alkalis, in particular the lialium salt, are excellent for this purpose. You are in the in Question coming temperature range not only extremely thin, but also specifically so light that most magnesium alloys are almost entirely in it submerge. Furthermore, they are resistant up to very high degrees of heat (red heat) and show no signs of decomposition. Added to that is the one for use decisive and surprising property that they contain magnesium and magnesium alloys practically do not attack.
Als vorteilhaft hat sich auch erwiesen, dem Sehmelzfluß geringe Mengen von Alkalifluoriden, insonderheit Natrium- oder Lithiumfluorid oder Gemische von beiden, in Höhe von bis zu etwa o,5 0% zuzusetzen.It has also proven advantageous to add small amounts to the Sehmelzfluss of alkali fluorides, in particular sodium or lithium fluoride or mixtures of to both, in the amount of up to about 0.50%.
Die Salzschmelzbäder gemäß Erfindung sind oberhalb 300' für alle technisch in Frage kommenden Glühtemperaturen verwendbar. Denn die Temperatur der beginnenden Erweichung der in der Technik verwendeten Magnesiumlegierungen (etwa 500') genügt noch nicht, um die Zersetzung der Alkalipyrosulfate in Alkalisulfat und Schwefelsäure in merkbarem Umfang zu bewirken.The molten salt baths according to the invention are technical above 300 'for everyone applicable annealing temperatures can be used. Because the temperature of the beginning Softening of the magnesium alloys used in technology (about 500 ') is sufficient not yet to the decomposition of the alkali pyrosulphates in alkali sulphate and sulfuric acid to effect to a noticeable extent.
Die Pyrosulfatschmelzen greifen sämtliche gangbaren Metalle und Legierungen, welche als Werkstoffe für die Badgefäße in Frage kommen, ganz erheblich an. Eine Ausnahme machen nur Platin bzw. Gold-Platin-Legierungen, während auch Silber und Gold-Silber-Legierungen stark korrodiert werden. Es hat sich deshalb als vorteilhafte Lösung der Gefäßfrage erwiesen, als Werkstoff für diese Gefäße ebenfalls Magnesium oder Magnesiumlegierungen zu verwenden oder mindestens als Auskleidung für die Gefäße, die aus irgendeinem feuerbeständigem Werkstoff bestehen können.The pyrosulphate melts attack all common metals and alloys, which come into question as materials for the bath vessels are very important. One The only exceptions are platinum or gold-platinum alloys, while also silver and Gold-silver alloys can be severely corroded. It has therefore proven to be beneficial The solution to the vascular problem has proven to be magnesium as the material for these vessels or magnesium alloys or at least as a lining for the vessels, which can consist of any fire-resistant material.
Claims (2)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE540947T | 1930-05-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE540947C true DE540947C (en) | 1931-12-31 |
Family
ID=6559105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE1930540947D Expired DE540947C (en) | 1930-05-07 | 1930-05-07 | Fused salt baths for the heat treatment of magnesium and magnesium alloys |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE540947C (en) |
-
1930
- 1930-05-07 DE DE1930540947D patent/DE540947C/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE2230506B2 (en) | Process for generating the phototropy in correspondingly assembled raw glasses by means of a temperature treatment in a liquid | |
| DE540947C (en) | Fused salt baths for the heat treatment of magnesium and magnesium alloys | |
| DE512904C (en) | Process for chemical hardening of hollow glass | |
| DE740349C (en) | Crucible for melting aluminum and its alloys | |
| DE557811C (en) | Production of a particularly suitable alumina for aluminum production | |
| DE688787C (en) | Process for the production of enamels, glazes or glass fluids that have been turned white with titanium dioxide | |
| DE830787C (en) | Process for the production of volatile chlorides | |
| DE903570C (en) | Process for the production of oleum | |
| DE659154C (en) | Process for the production of crystalline beryllium | |
| DE549966C (en) | Conversion of copper nitrate trihydrate into a less hygroscopic form | |
| DE885933C (en) | Process for removing the metals of the second group of the periodic table from aluminum alloys containing such metals | |
| DE3332796C1 (en) | Process for refining antimony-containing lead melts with supply of oxygen-enriched air | |
| DE1023232B (en) | Process for the finishing of aluminum-silicon alloys | |
| DE675524C (en) | Coloring glass flux | |
| DE488159C (en) | Absorption liquid, which consists of a solution of sodium hydrosulphite and sodium hydroxide, for cleaning off commercial nitrogen | |
| DE603574C (en) | Process for the production of beryllium alloys in melt flow | |
| DE964444C (en) | Alloy for deoxidizing iron alloys | |
| DE618464C (en) | Process for deoxidizing technically pure zinc | |
| CH216205A (en) | Process for making zirconium metal. | |
| DE330944C (en) | Process for the production of Glauber's salt from bisulfate and common salt | |
| DE411517C (en) | Process for the concentration of hydrous sulfuric acid resulting from the concentration of nitric acid and denitration | |
| DE620350C (en) | Process for the decomposition of alloys from 30 to 70% copper, the remainder essentially silver | |
| DE748099C (en) | Steel alloy for stirrer rods for smelting and copper alloys | |
| DE745474C (en) | Use of gold alloys for spinnerets | |
| DE613015C (en) | Process for improving aluminum-silicon alloys |