EP0185192B1 - Procédé d'anodisation dur des pièces coulées en aluminium fabriquées selon le procédé de coulée sous dépression - Google Patents

Procédé d'anodisation dur des pièces coulées en aluminium fabriquées selon le procédé de coulée sous dépression Download PDF

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Publication number
EP0185192B1
EP0185192B1 EP85114290A EP85114290A EP0185192B1 EP 0185192 B1 EP0185192 B1 EP 0185192B1 EP 85114290 A EP85114290 A EP 85114290A EP 85114290 A EP85114290 A EP 85114290A EP 0185192 B1 EP0185192 B1 EP 0185192B1
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EP
European Patent Office
Prior art keywords
casting
process according
content
anodizing
hard anodizing
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 - Lifetime
Application number
EP85114290A
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German (de)
English (en)
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EP0185192A3 (en
EP0185192A2 (fr
Inventor
Jochen Dr. Spriestersbach
Hans-Joachim Meier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vereinigte Aluminium Werke AG
Original Assignee
Vereinigte Aluminium Werke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Vereinigte Aluminium Werke AG filed Critical Vereinigte Aluminium Werke AG
Priority to AT85114290T priority Critical patent/ATE50604T1/de
Publication of EP0185192A2 publication Critical patent/EP0185192A2/fr
Publication of EP0185192A3 publication Critical patent/EP0185192A3/de
Application granted granted Critical
Publication of EP0185192B1 publication Critical patent/EP0185192B1/fr
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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
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/16—Pretreatment, e.g. desmutting

Definitions

  • the invention relates to a method for hard anodization of aluminum castings produced in vacuum pressure casting with a silicon content of more than 5% and a strontium content of 0.005 to 0.08% and / or a sodium content of 0.003 to 0.2%.
  • DE-B-1 191 116 discloses a method for achieving a uniform gray coloration on hardenable aluminum alloys, in which a silicon / aluminum alloy with a silicon content of 4 to 13% and a sodium content of 0.02 to 0.07% contributes to a heat treatment Temperatures of more than 400 ° C is subjected. These measures carried out on a semi-finished kneading product lead to a dense structure with low porosity which, with suitable annealing treatment, has a uniform gray coloration of the oxide layer thickness after the anodization of 6 to 30 11 m.
  • the aim of heat treatment is to achieve the highest possible strength. This takes place only with longer glow times and correspondingly high temperatures of around 500 ° C.
  • Die-casting alloys such as GD-AISi12, GD-AISi12 (Cu) and GD-AISi9Cu3 in particular can only be hard anodized using special processes (Aluminum-Taschenbuch, 14th edition 1983, p. 725; R. Nissen “Wear-resistant surface layers on aluminum -hard anodization- ", Metall Chemistry 36, (1982) 4, pages 148-149;” Corrosion and wear protection for die-cast aluminum alloys ", company information AHC Kerpen, Metall 37 (1983) 4, page 304).
  • the object of the present invention is to provide a process for the production of easily anodizable die-cast parts with Si contents above 5%, optionally with the addition of 1-5% Cu, produced by vacuum die-casting. which makes it possible to produce a wear-resistant, uniformly formed hard oxide layer on castings made of these alloys particularly economically using the GS or GSX process.
  • the invention now enables a special heat treatment of the castings with the addition of sodium.
  • Strontium possibly from antimony, calcium, barium and lanthanum to the alloy, an anodization layer on the casting with an even layer structure.
  • alloy components such as antimony, calcium, barium and / or lanthanum ensures a particularly smooth, dense structure in the die-cast part. There are no voids or pores on the casting surface.
  • the aluminum casting has an additional 1-5% copper. Then a uniform hard oxide layer with a high layer thickness is formed. With a Si content between 8 and 14%, it has been shown that the surface layer is particularly wear-resistant after hard anodization.
  • the additional elements specified in subclaims 3-5 have their effect particularly favorably at annealing temperatures between 430 and 480 ° C.
  • the temperatures used according to the invention now enable a hard anodization layer to be produced on the cast part surfaces with a very uniform layer structure.
  • the silicon particles are molded in and the distribution is more homogeneous during the annealing treatment of the cast part.
  • the theoretically possible layer thickness (“Aluminum" 41 (1965) 7, pages 417 - 422) of 46 ⁇ m was not reached with the current passage of 140 A min / dm 2 (8400 C / dm 2 ). In cross-section, a layer thickness of 30 ⁇ m with single values down to 20 ⁇ m was measured.
  • the heat treatment was carried out according to the following table. Anodizing was carried out for 120 minutes using the GSX method with a current density of 3 A / dm 2 , with an oxide layer thickness of 120 ⁇ m theoretically being expected. The layer thickness was measured on flat surfaces which had been mechanically processed prior to the anodic oxidation with the aid of the "Permascope" measuring device (DIN 50 984), which works according to the eddy current method.
  • the measurement results were as follows: As the list shows. the fluctuations in the oxide layer thickness for GD-AISi12Cu in the "cast untreated" state were very large. while when using the method according to the invention (refined melt and heat treatment of the cast part) a very uniform layer thickness was achieved for die-cast coatings in the anodic oxidation. In the case of the well-known anodizable alloy GD-AIMg9, however, the layer thicknesses were approximately the same regardless of the heat treatments carried out in the same way. On the basis of this finding, the different behavior of the GD-AlSi12Cu die-casting alloy was not to be expected.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Metallurgy (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Electrochemistry (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)
  • Mold Materials And Core Materials (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Thermally Insulated Containers For Foods (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Claims (6)

1. Procédé d'anodisation dure de pièces de fonderie réalisées en aluminium avec une teneur en silicium de plus de 5 % ainsi qu'une teneur en strontium de 0,005 à 0,08 % et/ou une teneur en sodium de 0,003 à 0,2 %, caractérisé en ce que les pièces de fonderie sont soumises à une mise en solution de 400 à 480°C pendant 3 à 20 minutes avant l'anodisation qui est réalisée selon le procédé à courant coutinu à l'acide sulfurique ou le procédé à courant continu à l'acide sulfurique et à l'acide oxalique.
2. Procédé selon la revendication 1, caractérisé en ce que la masse fondue contient au moins l'un des éléments suivants: antimoine, calcium, baryum, lanthane, la teneur totale des éléments ajoutés étant comprise entre 0,001 et 0,1 %.
3. Procédé selon l'une des revendications précédentes, caractérisé en ce que la pièce de fonderie d'aluminium comprend en plus 1 à 5 % de cuivre.
4. Procédé selon l'une des revendications précédentes, caractérisé en ce que la teneur en silicium est comprise entre 8 et 14 %.
5. Procédé selon la revendication 1, caractérisé en ce que la température de mise en solution est comprise entre 430 et 480°C.
6. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'anodisation dure est réalisée à des températures de 0 à 15°C.
EP85114290A 1984-11-22 1985-11-09 Procédé d'anodisation dur des pièces coulées en aluminium fabriquées selon le procédé de coulée sous dépression Expired - Lifetime EP0185192B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85114290T ATE50604T1 (de) 1984-11-22 1985-11-09 Verfahren zur hartanodisation von im vakuumdruckguss hergestellten aluminiumgussteilen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3442591 1984-11-22
DE19843442591 DE3442591A1 (de) 1984-11-22 1984-11-22 Verfahren zur hartanodisation von im vakuumdruckguss hergestellten aluminium-gussteilen

Publications (3)

Publication Number Publication Date
EP0185192A2 EP0185192A2 (fr) 1986-06-25
EP0185192A3 EP0185192A3 (en) 1987-02-25
EP0185192B1 true EP0185192B1 (fr) 1990-02-28

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Application Number Title Priority Date Filing Date
EP85114290A Expired - Lifetime EP0185192B1 (fr) 1984-11-22 1985-11-09 Procédé d'anodisation dur des pièces coulées en aluminium fabriquées selon le procédé de coulée sous dépression

Country Status (3)

Country Link
EP (1) EP0185192B1 (fr)
AT (1) ATE50604T1 (fr)
DE (2) DE3442591A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022902A1 (fr) * 2000-09-18 2002-03-21 Keronite Limited Materiau de construction a base d'aluminium et procede de production de pieces a partir de ce materiau

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6040059A (en) * 1997-11-18 2000-03-21 Luk Gmbh & Co. Component made of an aluminium silicon cast alloy
EP2096187A1 (fr) * 2008-02-28 2009-09-02 Georg Fischer Engineering AG Procédé destiné au traitement à chaud et au revêtement simultané d'un composant en aluminium et composant fabriqué selon ce procédé

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1191116B (de) * 1959-09-02 1965-04-15 Ver Deutsche Metallwerke Ag Verfahren zur Erzielung einer gleichmaessigen Graufaerbung von bestimmt einstellbarer Grautoenung an aushaertbaren Aluminiumlegierungen
FR1427043A (fr) * 1964-12-02 1966-02-04 Pechiney Prod Chimiques Sa Procédé d'obtention de coloration spéciale des alliages d'aluminium-silicium
JPS6013079B2 (ja) * 1978-01-31 1985-04-04 松下電器産業株式会社 アルミニウム箔の表面処理法
DE3244217A1 (de) * 1982-11-30 1984-05-30 Electro Chemical Engineering Gmbh, Zug Verfahren zur anodischen oxydation von aluminiumlegierungen
JPS60250893A (ja) * 1984-05-25 1985-12-11 Sumitomo Light Metal Ind Ltd アルミニウム製熱交換器用アルミニウム合金ろう

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002022902A1 (fr) * 2000-09-18 2002-03-21 Keronite Limited Materiau de construction a base d'aluminium et procede de production de pieces a partir de ce materiau

Also Published As

Publication number Publication date
DE3442591C2 (fr) 1993-07-15
ATE50604T1 (de) 1990-03-15
DE3576176D1 (de) 1990-04-05
EP0185192A3 (en) 1987-02-25
DE3442591A1 (de) 1986-05-22
EP0185192A2 (fr) 1986-06-25

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