EP0892074B1 - Formteil aus Magnesiumlegierung und Verfahren zur Herstellung dieses Formteils - Google Patents

Formteil aus Magnesiumlegierung und Verfahren zur Herstellung dieses Formteils Download PDF

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Publication number
EP0892074B1
EP0892074B1 EP98113061A EP98113061A EP0892074B1 EP 0892074 B1 EP0892074 B1 EP 0892074B1 EP 98113061 A EP98113061 A EP 98113061A EP 98113061 A EP98113061 A EP 98113061A EP 0892074 B1 EP0892074 B1 EP 0892074B1
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EP
European Patent Office
Prior art keywords
alloy
molded sheet
aluminum
metal
molded product
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EP98113061A
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English (en)
French (fr)
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EP0892074A1 (de
Inventor
Yukio Nishikawa
Takao Inoue
Tatsuhisa Taguchi
Naohiro Shikata
Yoshiaki Kondou
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
    • B22D17/007—Semi-solid pressure die casting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D21/00—Casting non-ferrous metals or metallic compounds so far as their metallurgical properties are of importance for the casting procedure; Selection of compositions therefor
    • B22D21/002—Castings of light metals
    • B22D21/007—Castings of light metals with low melting point, e.g. Al 659 degrees C, Mg 650 degrees C
    • 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
    • C22C1/12—Making non-ferrous alloys by processing in a semi-solid state, e.g. holding the alloy in the solid-liquid phase

Definitions

  • the present invention relates to a magnesium alloy molded product of magnesium-aluminum (Mg-Al) alloy used in exterior housings for household electric appliances and the like, and a method for producing the same.
  • Mg-Al magnesium-aluminum
  • Melting point of metallic magnesium is 650°C, and since the most of the magnesium alloys have a low melting point of 600°C or lower and thus the magnesium alloys can be molded by injection molding similar to the case of a synthetic resin, and it is thus possible to manufacture and supply injection molded products of complicated or intricated shapes.
  • the magnesium alloy of this kind however has a low anti-corrosion property in general and even with a normal protective paint layer, a product of the alloy cannot have an anti-corrosion property lasting for long-term.
  • the molded product has heretofore been usually treated with chromic acid (chromating), thereby to form a dense film of chromium oxide which is chemically stable on the whole surface of the molded product.
  • chromating requires the steps of degreasing by a treatment with a weak alkaline solution, washing with hot water, descaling by an acid washing, washing with water, the treatment with chromic acid, another washing with water, and so on.
  • the above-mentioned surface treatment for improving the anti-corrosion property however has problems in that the chromic acid solution contains a substance demonstrating an acute toxicity and an equipment for the treatment costs much by the required countermeasure for environment protection around the periphery of the equipment involved. In addition, it costs much for the surface treatment if the process includes a number of steps for forming a plurality of painted layers and the like.
  • Any of these methods intends to ensure the anti-corrosion property of the molded sheet as a whole by stopping growth of a corrosion nucleus generated at the ⁇ -phase and development of the corrosion nucleus with an intermetallic compound of ⁇ -phase having a high anti-corrosion property.
  • the former method however involves a modification of the once molded sheet into a layered pearlite structure by a liquefying treatment and an aging treatment.
  • the method requires a large-scale thermal treating equipment and the liquefying treatment process performed at not less than 400°C takes as long as 10 hours, and thus involves a high manufacturing cost.
  • Magnesium alloy moulded products comprising a magnesium alloy moulded sheet containing an average of 4 to 12% of aluminium.
  • This document further, discloses a method for producing magnesium alloy moulded products comprising the steps of heating a magnesium-aluminium alloy containing 2-12 wt% aluminium to a temperature exceeding the solidus temperature of the alloy, exerting a shearing force sufficient to break at least portion of the dendritic structure of the alloy on said heated alloy in a screw extruder, at a temperature higher than the solidus temperature and lower than the liquidus temperature of the alloy thereby to create a semisolid product, injecting it into a cavity between metal dies to obtain a moulded sheet.
  • an object of the present invention is to provide a magnesium alloy moulded product having a satisfactory anti-corrosion property with the treatment of low cost which entails no harmful substances.
  • Another object of the present invention is to provide a method for producing such magnesium alloy moulded product.
  • FIG. 1 is a schematic view of a cross-section of the magnesium alloy molded product in accordance with an embodiment of the present invention.
  • FIG. 2 is a schematic view of a cross-section of the magnesium alloy molded product in accordance with another embodiment of the present invention.
  • FIG. 3A is a schematic view of a micostructure of the magnesium alloy molded sheet in a casting die at the cross-section, for illustrating a process of casting the alloy by an injection molding.
  • FIG. 3B is a schematic view of a micostructure of the obtained magnesium alloy molded sheet.
  • FIG. 4 is a longitudinal cross-sectional view showing schematically an injection process step in an injection molding machine.
  • FIG. 5 is an equilibrium diagram for illustrating Mg-Al alloy.
  • FIG. 6 is a schematic view of a cross-section of a conventional magnesium alloy molded sheet.
  • the present invention provides a magnesium alloy molded product widely applicable to household electric appliances and the like.
  • the present invention uses an alloy of thixotropic type as specifically disclosed in U.S. Patents No. 4,694,881, 4,694,882 and 5,040,589 to produce a thin magnesium alloy molded sheet by injection molding and forms a mono-layered resin coating film on the surface of the resultant molded plate directly or via a thin film of a metal with an excellent corrosion property, such as aluminum or an aluminum alloy.
  • a magnesium-aluminum alloy with an aluminum content of 4 to 12 wt% as its average alloy composition is used. If the aluminum content is less than 4 wt%, a satisfactory anti-corrosion property cannot be obtained, whereas if the aluminum content exceeds 12 wt%, an intermetallic compound is liable to precipitate on the grain boundaries and causes brittleness of the alloy, and thus the both extremes are not preferable. As shown by the equilibrium diagram of FIG. 5, the alloy having such composition is composed of an ⁇ -phase and an ⁇ - ⁇ -phase of eutectic crystals in the vicinity of room temperature.
  • the above-mentioned alloy preferably contains zinc (Zn) in a range of not more than 2 wt%. Although Zn improves strength of the alloy, ductility of the alloy is reduced if Zn content exceeds 2 wt%.
  • a liquid-solid alloy composition is created by exerting a shearing force sufficient for breaking at least portion of dendritic crystal structure of the alloy on the structure by a screw extruder, at a temperature higher than the solidus temperature and lower than the liquidus temperature of the alloy. That is, as shown by FIG. 3A, a molten alloy 10 wherein subdivided solids of ⁇ -phase 11 are being dispersed is prepared, and is then solidified in a narrow cavity 50 formed between the metal dies 5, 5 in a fluidized state at a relatively large cooling speed.
  • the portion of the molten alloy enriched with aluminum is solidified around the crystals of ⁇ -phase 11, before they are grown into the pillar-shaped crystals.
  • the cast micostructure of the magnesium alloy molded sheet 1 thus obtained becomes a mesh-like structure composed of a number of granular Al-poor regions 11, each consisting mainly of the ⁇ -phase as it is, and the Al-rich region 12 having a larger aluminum content than that of the average alloy composition and being formed for surrounding the respective Al-poor regions.
  • the Al-poor region since the Al-poor region has a poor anti-corrosion property, the Al-poor region surrounded by the Al-rich region is preferentially corroded under a corrosive environment, but possible development and growth of the corrosion is inhibited by the Al-rich region. By this means, the anti-corrosion property of the whole is ensured. For that reason, it is preferable that the grains of the Al-poor region 11 are as small as possible. From this point, it is required to make the particle size of the granular crystals of the Al-poor region not larger than 200 ⁇ m. As shown by FIG. 3B, it is preferred to adjust the particle size of smaller grains 11 in the Al-poor region to 5 to 20 ⁇ m, and that of larger grains 111 to 50 to 150 ⁇ m, and further to adjust the average particle size to not larger than 50 ⁇ m.
  • the magnesium alloy molded product having such mesh-like structure is obtained by a concurrent use of the preparation of the above-mentioned liquid-solid alloy composition and the rapid cooling of the composition.
  • a die casting of the molten alloy a direct casting and roll-pressing from the molten alloy and the like can also be employed, an injection molding whereby the molten alloy is injected into a narrow cavity formed between the metal dies is particularly preferable.
  • the magnesium alloy molded sheet obtained in the above-mentioned manner is released from the metal dies, then formed with a resin coating film on its surface by applying a paint, and thereafter subjected to a baking step for curing the coating film by heating.
  • the injection molding is composed of the steps of preparing a liquid-solid alloy composition by exerting a shearing force on the alloy at a specified temperature and casting by injection.
  • any conventional equipment can be employed as the injection molding equipment.
  • An example of the injection molding equipment is shown in FIG. 4.
  • the injection molding equipment is, for instance, composed of a screw extruder 8 which heats the starting material of the alloy and feeds or discharges the molten alloy at a high pressure, and a pair of metal dies 5 (5a, 5b) having a cavity 50 of a desired pattern in their inside surfaces 51, which communicates through a discharge end 80 of the extruder 8.
  • the metal dies 5 can be split or separated into a die 5a and a die 5b for unloading the molded product.
  • the injection molding is performed in the following procedure. Namely, a description will be made by selecting an alloy (liquidus temperature of about 530°C) composed of 9 wt% aluminum, about 1 % zinc and the balance of magnesium as the alloy. Tips of the alloy of this composition are charged into a hopper 86 of the extruder 8, fed or transferred into a cylinder 81 of the extruder 8 by a screw 83.
  • an alloy liquidus temperature of about 530°C
  • Tips of the alloy of this composition are charged into a hopper 86 of the extruder 8, fed or transferred into a cylinder 81 of the extruder 8 by a screw 83.
  • the tips are molten at a temperature (about 550°C for the above-mentioned alloy of 9 wt% Al) which is slightly higher than the liquidus temperature, by heating action of a heater 84 for the cylinder 81.
  • a temperature about 550°C for the above-mentioned alloy of 9 wt% Al
  • the molten alloy is brought to a state where Mg-rich granular crystals are caused to precipitate and dispersed in the Al-rich molten alloy.
  • the temperature to which the alloy is heated is adjusted to a temperature between the liquidus temperature and the solidus temperature.
  • the metal dies 5 used for the injection molding is usually made of steel.
  • the cooling speed during the casting process by the injection can be adjusted in compliance with the width of the cavity formed between the metal dies and with the temperature of the metal dies before the injection. It is therefore possible to adequately reduce the cooling speed by heating the metal dies. It is usually preferable for improving the fluidity of the molten alloy to previously heat the metal dies to a temperature range of 50 to 300°C.
  • the split dies are set as the metal dies
  • the discharge end of the screw extruder is connected to an injection opening of the metal dies
  • the screw 83 is revolved in the cylinder 81, while it is retreated back, thereby to feed or transfer the above-mentioned molten alloy 10 containing the dispersed Mg-rich granular crystals to a front part of the cylinder 81 and to form a molten alloy reserve 82.
  • the screw is advanced by a pressing means 85, thereby to inject the molten alloy into the casting cavity 50 formed between the metal dies at a high speed.
  • the molten alloy 10 in a state of being fed to the casting cavity 50 by the injection is gradually cooled while being kept in contact with the inside surface of the cavity, and solidification of the molten alloy proceeds in its fluidized state in compliance with the above-mentioned procedure.
  • the molten alloy 10 is cooled while being kept under pressure of the screw 85 pushed by the pressing means 85, thereby to ensure spreading the molten alloy 10 all over the cavity 50 of the dies, by being pressed against the inside surface of the cavity, while compensating its shrinkage due to the solidification by further supply.
  • the dies are split for unloading the molded sheet 1 which is then left to be cooled.
  • a mold release agent to the inside surface of the cavity 50 of the metal dies 5.
  • the mold release agent a mixed material of waxes of, for instance, aliphatic acid esters is used.
  • the application of the mold release agent is usually performed by spraying a liquid mold release agent on the inside surface 51 of the cavity 50 of the metal dies in their split state through a spray nozzle and then drying. In this manner, a film of the mold release agent 7 with a thickness of about 100 ⁇ m is formed on the inside surface 51 of the cavity 50 of the metal dies 5a, 5b.
  • the mold release agent it is possible to prevent seizure of the molded sheet to the casting dies and to make the releasing of the molded sheet from the die easy.
  • the thickness of the obtained injection molded sheet is about 2mm, it becomes a mesh-like structure comprising the Al-poor region of a number of granular crystals with a diameter from several ⁇ m to 20 ⁇ m and the Al-rich region surrounding the respective granular crystals of the Al-poor region.
  • the cooling speed during the solidification process is 100 to 2000°C/sec., and the Al-poor region and the Al-rich region are in a non-equilibrium state where the composition is not constant and the boundary between the both region is not necessarily clear.
  • a coating film 2 is formed as shown by FIG. 1.
  • This coating film is formed for coloring the molded sheet for ornament and for giving an anti-humid property thereon.
  • the thickness of the coating film is suitably 10 to 30 ⁇ m. If the coating film is thinner than this, a satisfactory anti-humid effect cannot be obtained. If the coating film is thicker than the above-mentioned range, no metallic texture attributable to the use of the magnesium alloy is obtained and its appearance becomes worse, even in a case of using a transparent coating film.
  • Formation of the coating film 2 is composed of the steps of applying a resin paint on the surface of the molded sheet released from the metal dies and baking the paint by heating the applied molded sheet.
  • the baking conditions vary depending on the resin for configuring the coating film, it is suitable to heat the molded sheet at 120 - 220°C for 10 to 60 minutes. This heating condition does not substantially influence on the above-mentioned non-equilibrium structure composed of the Al-poor region and the Al-rich region of the magnesium alloy.
  • a preferred magnesium alloy molded product in accordance with the present invention comprises, as shown by FIG. 2, the injection molded sheet 1, a metal thin layer 3 formed on the molded sheet and a coating film 2 formed thereon.
  • the metal thin layer 3 the use of a metal having a better anti-corrosion property than that of the magnesium alloy of the above-mentioned composition is preferable, and in particular, the use of aluminum or an aluminum alloy is preferable.
  • a metal such as zinc having a small potential difference with magnesium, i.e., a metal or its alloy which is near to Mg or nobler than Mg in the electrochemical series may be used.
  • the thermal spraying process has a feature capable of forming a metal thin layer of a large adhesion, because it involves a spraying of molten metal particles which are firmly stuck to the surface of the magnesium alloy even with any foreign matters such as fatty oil remaining on the surface of the molded product which are destroyed at the time of the spraying.
  • aluminum or an aluminum alloy is used as the metal thin layer, aluminum in the metal thin layer diffuses into the magnesium alloy molded sheet at the time of baking the resin coating film, thereby to raise a bonding strength between them.
  • the aluminum layer as the metal thin layer may alternatively be formed by any other process in a thin-film forming equipment using, for instance, sputtering in a vacuum chamber, plasma CVD, or the like process.
  • a thin-film forming equipment it is preferable to mechanically grinding the surface of the magnesium alloy molded sheet and thereafter form the metal thin layer.
  • the thickness of the metal thin layer 3 is suitably 0.05 to 1.0 ⁇ m. A satisfactory anti-corrosion property is demonstrated with the thickness of the film of not less than 0.05 ⁇ m, but if the thickness exceeds 1.0 ⁇ m, an unduly long time is taken for the film forming which represents a high manufacturing cost.
  • the coating film is formed by the previously-mentioned procedure.
  • the thermally sprayed aluminum film as the metal thin layer has a number of pinholes, the pinholes are sealed with the coating film, and thus it is possible to prevent the invasion of water by sealing effect of the coating film.
  • a transparent material for instance, a paint composed mainly of an acrylic resin and a melamine resin, available from Honney Chemicals Co.Ltd., under a trade name "Honneyceran", as the material for the resin coating film and to finish the substrate of the molded sheet or the metal thin layer to appear a metallic luster surface by machine tooling with a bite, grinding with a grindstone, and the like.
  • the magnesium alloy molded product in accordance with the present invention can improve its anti-corrosion property by forming a mesh-like structure composed of the Al-poor region and the Al-rich region in the alloy molded sheet itself. Further, since it realizes the water-proof property of the surface and improves the anti-corrosion property of the molded product as a whole by forming a coating film on the surface of the molded sheet.
  • the anti-corrosion property of the magnesium alloy molded sheet can further be enhanced by forming the metal thin layer on the magnesium alloy molded sheet and forming the coating film thereon.
  • the method for producing the magnesium alloy molded product in accordance with the present invention is performed by casting process using an injection molding machine with the conventional screw. Since the coating film of the resin can demonstrate a satisfactory anti-corrosion property with only one layer of the film, it is possible to easily obtain a thin molded product excellent in practical anti-corrosion property, without requiring a particularly large-scale equipment or apparatus and without inviting a high manufacturing cost. Further, since the metal thin layer can easily and rapidly be formed by the thermal spraying process or a thin film-forming process, it is possible to realize a high grade anti-corrosion property without inviting a high manufacturing cost.
  • the magnesium alloy tips to be fed to the molding machine, as the starting material for the magnesium alloy molded product of the present invention, are frequently finished to have the size ranging from 2 mm to 10 mm for ensuring safety such as prevention of igniting.
  • it is desirable that the sizes are approximately uniform for facilitating the flow of the tips in the cylinder of the molding machine.
  • a process for preparing such tip material there is known a cutting or a liquid phase rapid cooling process.
  • the cutting process requires a previous preparation of the material which permits easy handling in the cutting and has constant shapes such as cylindrical and the like shapes, by for instance, casting, and thus it is difficult to obtain tips directly from waste material having nonuniform or irregular shapes.
  • the liquid phase rapid cooling process requires a melting step and also invites a high manufacturing cost.
  • the magnesium alloy into the tips by exerting a plastic deformation on the magnesium alloy to the extent of not less than the rupture elengation of the alloy and to select the broken tips into the tips having the intended sizes.
  • the starting material As a method for causing the starting material to be plastically deform, there is a process of charging the alloy starting material into a compressible container and compressing the alloy by a high pressure applying machine to be plastically deformed.
  • the alloy material is broken in a manner whereby the tips are ripped off from its surface as they cleave in compliance with the magnitude and the speed of the deformation.
  • An alternative method is a process of plastically deform the alloy material by feeding the starting material to a gap formed between a pair of rotating pressure rolls. One or two steps of the pressure rolls are used.
  • the plastic deformation of the alloy at a temperature of not higher than 300°C. If the temperature exceeds 300°C, the ductility of the alloy is made high and the tipping of the alloy by the plastic deformation is made difficult.
  • the particles of the alloy broken into the tips in the previously mentioned manner are preferably selected continuously by being charged into a mesh-like selecting machine equipped with a vibrator for facilitating the selection.
  • the sizes of the tips are preferably not less than 1 mm and not more than 20 mm at the maximum length.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Laminated Bodies (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Claims (9)

  1. Magnesiumlegierungsformteil, aufweisend:
    Ein Magnesium-Aluminiumlegierungsformblech, das 4 bis 12 Gew.-% Aluminium in einer mittleren Legierungszusammensetzung enthält, und das einen Al-armen Bereich aus Körnern mit einem mittleren Partikeldurchmesser nicht kleiner als 20 µm, wobei ein Mg-Gehalt höher ist als derjenige der mittleren Legierungszusammensetzung, und einen Alreichen Bereich enthält, in dem der Al-Gehalt höher ist als derjenige der mittleren Legierungszusammensetzung,
    wobei dieser Bereich die Körner des Al-armen Bereichs umgibt, und einen Harzbeschichtungsfilm, der die Oberfläche des Formblechs abdeckt, wobei eine Dicke des Formblechs 0,3 bis 3 mm beträgt, dadurch gekennzeichnet, dass zumindest eine dünne Metallschicht mit einer höheren Antikorrosionseigenschaft als diejenige des Formblechs, gebildet zwischen dem Formblech und dem Harzbeschichtungsfilm, vorgesehen ist, wobei die dünne Metallschicht Aluminium oder eine Aluminiumlegierung enthält,
    wobei die Oberfläche der dünnen Metallschicht einen metallischen Glanz aufweist, und wobei der Harzbeschichtungsfilm transparent ist, und wobei die dünne Metallschicht eine Dicke von 0,05 bis 1,0 µm aufweist.
  2. Magnesiumlegierungsformteil nach Anspruch 1, wobei die Magnesium-Aluminiumlegierung nicht mehr als 2 Gew.-% Zink enthält.
  3. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 1 oder 2, aufweisend die Schritte:
    Erhitzen einer Magnesium-Aluminiumlegierung, die 4 bis 12 Gew.-% Aluminium enthält, auf eine Temperatur, die zumindest die Solidustemperatur der Legierung übersteigt,
    Ausüben einer Scherkraft, die hinreicht, zumindest einen Teil der dendritischen Struktur der Legierung auf der Hitzelegierung in einem Schneckenextruder aufzubrechen, bei einer Temperatur, die höher ist als die Solidustemperatur und niedriger als die Liquidustemperatur der Legierung, um eine Flüssigkeits-/Feststofflegierungszusammensetzung zu erzeugen,
    Einspritzen der Flüssigkeits-/Feststofflegierungszusammensetzung in einen Hohlraum, der zwischen Metallformen gebildet ist, um ein Formblech mit einer Dicke von 0,2 bis 3 mm zu erhalten,
    Bilden einer dünnen Metallschicht mit einer höheren Korrosionseigenschaft als diejenige des Formblechs auf dem Formblech aus der Legierung und mechanisches Bearbeiten der Oberfläche der dünnen Metallschicht, um eine Oberfläche mit metallischem Glanz zu erzielen,
    Auftragen eines Harzanstrichs auf der Oberfläche des Formblechs, das von den Metallformen abgelöst ist, zur Bildung einer Harzbeschichtungsfilmschicht, und
    Unterwerfen des Harzbeschichtungsfilms einer thermischen Behandlung, um den Harzbeschichtungsfilm auszuhärten.
  4. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 3, aufweisend den Schritt, die Oberfläche des Formblechs aus der Legierung mechanisch zu bearbeiten, um eine metallisch glänzende Oberfläche zu erzielen, und zwar vor dem Schritt des Auftragens des Harzanstrichs.
  5. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 3, wobei der Schritt zum Ausbilden der dünnen Metallschicht durchgeführt wird durch thermisches Sprühen von Aluminium oder einer Aluminiumlegierung auf die Oberfläche des Formblechs aus der Legierung.
  6. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 3, wobei der Schritt zum Ausbilden der dünnen Metallschicht die Schritte umfasst, die Oberfläche des Formblechs aus der Legierung zu bearbeiten und eine dünne Metallschicht auf der Oberfläche des Formblechs in einem Vakuumbehälter einer Dünnschichtausbildungsanlage auszubilden.
  7. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 3, außerdem aufweisend den Schritt, die Magnesium-Aluminiumlegierung zuzubereiten, wobei der Schritt die Schritte aufweist:
    Ausüben einer plastischen Verformung auf die Legierung mit einem Ausmaß, das nicht geringer ist als die Bruchlängung der Legierung, um Aluminiumstücke zu erzeugen, und Selektieren der abgerissenen Stücke nach vorbestimmten Größen.
  8. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 7, wobei der Schritt zum Ausüben der plastischen Verformung einen Prozess zum Komprimieren der Legierung durch eine Hochdruckpresse umfasst.
  9. Verfahren zum Herstellen eines Magnesiumlegierungsformteils nach Anspruch 7, wobei der Schritt zum Ausüben der plastischen Verformung einen Prozess zum Pressen der Legierung durch ein Paar von Drehrollen umfasst.
EP98113061A 1997-07-17 1998-07-14 Formteil aus Magnesiumlegierung und Verfahren zur Herstellung dieses Formteils Expired - Lifetime EP0892074B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP192261/97 1997-07-17
JP19226197 1997-07-17
JP9192261A JPH1136035A (ja) 1997-07-17 1997-07-17 マグネシウム合金成形品とその製造方法

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EP0892074A1 EP0892074A1 (de) 1999-01-20
EP0892074B1 true EP0892074B1 (de) 2002-05-02

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DE (1) DE69805140T2 (de)

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US20050139466A1 (en) * 2003-10-28 2005-06-30 Morris William M. Electrode structure for a electrochemical cells
JP4625944B2 (ja) * 2004-06-10 2011-02-02 国立大学法人九州工業大学 耐食性に優れたマグネシウム材
CN101450543B (zh) * 2007-12-06 2013-07-03 鸿富锦精密工业（深圳）有限公司 车辆油底壳及其制备方法
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JP2012140656A (ja) * 2010-12-28 2012-07-26 Sumitomo Electric Ind Ltd マグネシウム合金材
CN109986061B (zh) * 2017-12-29 2021-05-04 南京理工大学 一种多尺度析出层片结构镁合金的制备方法

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CN1210042A (zh) 1999-03-10
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JPH1136035A (ja) 1999-02-09
CN1113106C (zh) 2003-07-02

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