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
  • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/02—Making non-ferrous alloys by melting
  • C22C1/026—Alloys based on aluminium
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/02—Making non-ferrous alloys by melting
  • C22C1/03—Making non-ferrous alloys by melting using master alloys

Definitions

• the present invention relates to a process for producing an aluminium-magnesium alloy and to an alloy produced by the process.
• beryllium Be
• beryllium is mentioned for reducing the oxidation tendency of AIMg melts.
• One example is EP31 59422 A1 .
• 10-50 Be ppm is added to an AlMg 5 Si 2 Mn alloy.
• an increased addition of beryllium to a metal melt is undesirable because of the carcinogenic properties of beryllium and therefore a reduced addition should be aimed for.
• a method is proposed for the addition of vanadium (V) and beryllium to an AlMg alloy. It was found that by adding vana ⁇
• One object is to provide a process which provides for the addition of an element or a combination of elements which cause a catalytic reaction and thus promote the formation of a passivation layer on the aluminium melt. By forming the passivation layer, further oxidation of the molten metal and thus undesirable formation of dross is prevented. 5
• the process according to the invention is directed towards the production of an aluminiummagnesium alloy with a content of at least 1 % Mg, preferably 1 - 7% Mg, more preferably at least 2% Mg, preferably 2 - 7% Mg. To this alloy 0.01 - 2% calcium (Ca) and 0.01 - 0.3% V are added in the molten state.
• 0.05% - 1 % Ca is added to the alloy in the molten state.
• 0.07% - 0.5% Ca is added to the alloy in the molten state.
• 0.02 - 0.1 5% V is added to the alloy in the molten state.
• Ca and V are added as aluminium master alloy during the production of the aluminium-magnesium alloy, preferably the first master alloy contains 10% Ca and 90% Al and the second master alloy contains 1 0% V and 90% Al.
• Ca and V are added at a melt temperature of5 680 - 750°C.
• At least one of the following elements is added to the alloy in the molten state: Iron (Fe), Manganese (Mn), Strontium (Sr), Phosphorus (P), Nickel (Ni), Zinc (Zn), Copper (Cu), Silicon (Si), Titanium (Ti), Chromium (Cr), Molybdenum (Mo), Zirconium (Zr), Hafnium (Hf), Gallium (Ga), Boron (B).
• the following elements are added to the alloy in the molten state in addition to Al, Mg, Ca and V, either individually or as a master alloy:
• the alloy produced by the process according to the invention is a die-cast alloy.
• An Al-Mg alloy produced by the process according to the invention consists of the following elements:
• V 0.01 - 0.3%
• V preferably 0.02 - 0.1 5%, particularly preferred 0.02 - 0.08%
• Mn Up to 2.5% Mn, preferably 0 - 0.6% Mn
• an element or element group selected from the group consisting of Cr, Ni, Mo, Zr, Hf, Ga and B, and the balance Al and unavoidable impurities.
• AlMg alloy which is to be protected against oxidation, is left in ambient air at a defined temperature for a certain time in an open crucible. Then the formation of the oxide layer is determined.
• Al alloys with a Mg content of 4 - 6% a visible oxide layer appears after a0 few days, the strength of which is significantly higher than in Al alloys without a Mg content.
• the following 1 5 test trials were carried out at the Tech Center Rheinfelden. The alloys were produced in an open, electrically heated crucible furnace. At a melt temperature of 700°C, high-pressure die casting trials were carried out and the melt was left in ambient air. The casting tests were carried out on a 400 to die casting cell and the produced test plates had
• compositions V1 to V1 are compositions without beryllium. Beryllium is known as an element for improving the oxidation tendency of an AlMg alloy and would falsify the evaluation of the effect of Ca and V.
• the formation of the oxide layer which could be improved with the addition of Ca and V, was assessed on the basis of three predefined classes.
• the aim is an oxide layer according to type A.
• Type B is classified as a poor result and type C as a very poor result for the formation of the oxide layer. This classification, as used in the following examples, is explained in more detail below.
• Type A Very thin oxide layer, which moves with the molten metal. It does not resist mechanical action.
• Type B Thin, semi-solid oxide layer that breaks into pieces when the melt moves. Little resistance to mechanical action.
• Type C Solid oxide layer that does not move with the melt. Considerable resistance to mechanical action.

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Mechanical Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Manufacture And Refinement Of Metals (AREA)
• Treatment Of Steel In Its Molten State (AREA)
• Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
• Heat Treatment Of Steel (AREA)

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Citations (5)

• 2021
  • 2021-12-10 EP EP21213909.1A patent/EP4194575A1/en active Pending
• 2022
  • 2022-12-02 JP JP2024532191A patent/JP2024544764A/ja active Pending
  • 2022-12-02 WO PCT/EP2022/084184 patent/WO2023104652A1/en not_active Ceased
  • 2022-12-02 US US18/717,884 patent/US20260022440A1/en active Pending
  • 2022-12-02 CN CN202280080777.6A patent/CN118541498A/zh active Pending
  • 2022-12-02 CA CA3240203A patent/CA3240203A1/en active Pending
  • 2022-12-02 KR KR1020247018834A patent/KR20240145971A/ko active Pending
  • 2022-12-02 MX MX2024007028A patent/MX2024007028A/es unknown

Patent Citations (5)

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