AT147782B - Process for increasing the corrosion resistance of alloys of aluminum with about 3 to 16% magnesium. - Google Patents
Process for increasing the corrosion resistance of alloys of aluminum with about 3 to 16% magnesium.Info
- Publication number
- AT147782B AT147782B AT147782DA AT147782B AT 147782 B AT147782 B AT 147782B AT 147782D A AT147782D A AT 147782DA AT 147782 B AT147782 B AT 147782B
- Authority
- AT
- Austria
- Prior art keywords
- alloys
- magnesium
- aluminum
- corrosion resistance
- increasing
- Prior art date
Links
- 239000000956 alloy Substances 0.000 title claims description 8
- 229910045601 alloy Inorganic materials 0.000 title claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims description 6
- 229910052749 magnesium Inorganic materials 0.000 title claims description 6
- 239000011777 magnesium Substances 0.000 title claims description 6
- 238000005260 corrosion Methods 0.000 title claims description 5
- 230000007797 corrosion Effects 0.000 title claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 4
- 229910052782 aluminium Inorganic materials 0.000 title claims description 4
- 238000000034 method Methods 0.000 title claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000000265 homogenisation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005496 tempering Methods 0.000 description 2
- GANNOFFDYMSBSZ-UHFFFAOYSA-N [AlH3].[Mg] Chemical class [AlH3].[Mg] GANNOFFDYMSBSZ-UHFFFAOYSA-N 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001226 reprecipitation Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Landscapes
- Heat Treatments In General, Especially Conveying And Cooling (AREA)
Description
<Desc/Clms Page number 1>
Verfahren zur Erhöhung der Korrosionsfestigkeit von Legierungen des Aluminiums mit etwa 3 bis 16%
Magnesium.
Gegenstand des Patentes Nr. 145 078 ist ein Verfahren zur Erhöhung der Korrosionsbeständigkeit von Legierungen aus 3-16% Magnesium, gegebenenfalls 0'1-2% Mangan, Rest Aluminium, dadurch gekennzeichnet, dass zunächst ein mehr oder weniger homogenes Gefüge durch Glühung bei Temperaturen zwischen dem Soliduspunkt und demjenigen Temperaturgebiet, in dem die Veränderlichkeit der Löslichkeit des Magnesiums in festem Zustand nennenswerte Beträge annimmt, d. h. zwischen etwa 2000 und 4500 C, hergestellt wird, worauf eine Wiederausscheidung der in Lösung gegangenen Anteile des Magnesiums in fein verteilter Form durch eine Anlassbehandlung herbeigeführt wird. Dabei kann an Stelle der Anlassbehandlung eine künstlich stark verzögerte Abkühlung aus dem die teilweise oder völlige Homogenisierung bedingenden Temperaturgebiet erfolgen.
Die erhöhte Korrosionsbeständigkeit der Legierungen ist dabei auf die durch die Wärmebehandlung hervorgerufene Ausscheidung eines im wesentlichen aus der Verbindung AIgMgs bestehenden Gefügebestandteils (sogenannte ss-Phase) in der aus mehr oder weniger gleichförmig gesättigten Aluminium-Magnesium-Mischkristallen bestehenden Grundmasse (sogenannte a-Phase) in gleichmässig feiner Verteilung zurückzuführen.
Weitere Untersuchungen haben nun ergeben, dass die grösstmögliche Gleichförmigkeit der Verteilung der aus der ss-Phase bestehenden Ausscheidungen in der Grundmasse aus a-Kristallen dadurch erzielt wird, dass nach Abschluss der homogenisierenden Wärmebehandlung bei Temperaturen oberhalb der Entmischungslinie eine Abkühlung der Legierung bis in ein Temperaturbereich erfolgt, dessen obere Grenze durch die zwischen dem a-und a+-Feld des Zustandsdiagramms verlaufende Entmischunglinie gegeben wird, während die untere Grenze des Temperaturgebiets durch eine Kurve bestimmt wird,
EMI1.1
gestrichelte Gebiet). Die Legierung wird erfindungsgemäss alsdann in diesem Temperaturbereich während einiger Zeit, im allgemeinen 1-2 Stunden, gehalten, bis die gewünschte gleichförmige Ausscheidung stattgefunden hat.
Die Gleichförmigkeit der Ausscheidung kann durch mikrographische Prüfung kontrolliert werden.
Nach Abschluss dieser Behandlung kann eine Abkühlung des Werkstoffes an der Luft erfolgen, durch die das durch die beschriebene Wärmebehandlung erzeugte Gefüge weitere Veränderungen nicht erleidet.
Die Abkühlung aus dem Homogenisierungsbereich bis in das in der Zeichnung durch Strichelung wiedergegebene Temperaturgebiet kann auf natürliche Weise erfolgen, gegebenenfalls aber auch dadurch, dass man den homogenisierten Werkstoff in ein aus Öl oder einer ähnlichen indifferenten Flüssigkeit mit entsprechend hohem Siedepunkt bestehendes Bad bringt, dessen Temperatur automatisch, z. B. vermittels eines Thermostaten oder ähnlicher Vorrichtungen, auf der gewünschten Höhe gehalten wird.
**WARNUNG** Ende DESC Feld kannt Anfang CLMS uberlappen**.
<Desc / Clms Page number 1>
Process for increasing the corrosion resistance of alloys of aluminum by about 3 to 16%
Magnesium.
The subject of patent no. 145 078 is a method for increasing the corrosion resistance of alloys made from 3-16% magnesium, optionally 0.1-2% manganese, the remainder being aluminum, characterized in that initially a more or less homogeneous structure is obtained by annealing at temperatures between the solidus point and that temperature region in which the variability of the solubility of magnesium in the solid state assumes significant amounts, d. H. between about 2000 and 4500 C, after which a re-precipitation of the dissolved portions of the magnesium in finely divided form is brought about by a tempering treatment. In this case, instead of the tempering treatment, an artificially strongly delayed cooling from the temperature range causing the partial or complete homogenization can take place.
The increased corrosion resistance of the alloys is due to the precipitation caused by the heat treatment of a structural component consisting essentially of the compound AIgMgs (so-called ss phase) in the base mass consisting of more or less uniformly saturated aluminum-magnesium mixed crystals (so-called a-phase) in an evenly fine distribution.
Further investigations have now shown that the greatest possible uniformity of the distribution of the precipitates from the SS phase in the basic mass of a crystals is achieved by cooling the alloy down to a temperature range after the homogenizing heat treatment at temperatures above the separation line takes place, the upper limit of which is given by the segregation line running between the a- and a + -field of the state diagram, while the lower limit of the temperature range is determined by a curve,
EMI1.1
dashed area). According to the invention, the alloy is then kept in this temperature range for some time, generally 1-2 hours, until the desired uniform precipitation has taken place.
The uniformity of the precipitation can be checked by micrographic examination.
After completion of this treatment, the material can be cooled in the air so that the structure produced by the heat treatment described does not suffer any further changes.
The cooling from the homogenization area to the temperature area shown by dashed lines in the drawing can take place naturally, but if necessary also by bringing the homogenized material into a bath consisting of oil or a similar inert liquid with a correspondingly high boiling point, its temperature automatically, e.g. B. by means of a thermostat or similar devices, is kept at the desired level.
** WARNING ** End of DESC field may overlap beginning of CLMS **.
Claims (1)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE145078X | 1932-12-24 | ||
| GB147782X | 1934-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT147782B true AT147782B (en) | 1936-11-25 |
Family
ID=34227320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT147782D AT147782B (en) | 1932-12-24 | 1935-10-22 | Process for increasing the corrosion resistance of alloys of aluminum with about 3 to 16% magnesium. |
Country Status (1)
| Country | Link |
|---|---|
| AT (1) | AT147782B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE755665C (en) * | 1938-07-07 | 1952-10-20 | Ver Leichtmetallwerke G M B H | Process for the production of corrosion-resistant and tempering-resistant aluminum-magnesium wrought alloys |
| DE764184C (en) * | 1939-09-30 | 1952-11-24 | Metallgesellschaft Ag | Process for improving the stress corrosion resistance of aluminum alloys with zinc and / or magnesium |
| DE935333C (en) * | 1943-07-17 | 1956-01-19 | Westfaelische Leichtmetallwerk | Process for increasing the stress corrosion resistance of workpieces, especially sheet metal, made of hardenable aluminum alloys of the type Al-Mg-Zn |
-
1935
- 1935-10-22 AT AT147782D patent/AT147782B/en active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE755665C (en) * | 1938-07-07 | 1952-10-20 | Ver Leichtmetallwerke G M B H | Process for the production of corrosion-resistant and tempering-resistant aluminum-magnesium wrought alloys |
| DE764184C (en) * | 1939-09-30 | 1952-11-24 | Metallgesellschaft Ag | Process for improving the stress corrosion resistance of aluminum alloys with zinc and / or magnesium |
| DE935333C (en) * | 1943-07-17 | 1956-01-19 | Westfaelische Leichtmetallwerk | Process for increasing the stress corrosion resistance of workpieces, especially sheet metal, made of hardenable aluminum alloys of the type Al-Mg-Zn |
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