EP0488944A1 - Verfahren zum Anodisieren von ALSi-Legierungen - Google Patents
Verfahren zum Anodisieren von ALSi-Legierungen Download PDFInfo
- Publication number
- EP0488944A1 EP0488944A1 EP91810864A EP91810864A EP0488944A1 EP 0488944 A1 EP0488944 A1 EP 0488944A1 EP 91810864 A EP91810864 A EP 91810864A EP 91810864 A EP91810864 A EP 91810864A EP 0488944 A1 EP0488944 A1 EP 0488944A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- surface layer
- melting
- crystals
- oxide layer
- anodic oxide
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims description 14
- 229910000838 Al alloy Inorganic materials 0.000 title abstract description 6
- 238000007743 anodising Methods 0.000 title description 2
- 239000010410 layer Substances 0.000 claims abstract description 15
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 15
- 239000002344 surface layer Substances 0.000 claims abstract description 12
- 239000013078 crystal Substances 0.000 claims abstract description 10
- 239000010407 anodic oxide Substances 0.000 claims abstract description 9
- 239000002245 particle Substances 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 6
- 239000000956 alloy Substances 0.000 claims abstract description 6
- 230000003647 oxidation Effects 0.000 claims abstract description 5
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 5
- 229910000789 Aluminium-silicon alloy Inorganic materials 0.000 claims abstract description 4
- 230000005496 eutectics Effects 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims description 11
- 238000002844 melting Methods 0.000 claims description 11
- 230000005855 radiation Effects 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000004927 fusion Effects 0.000 abstract 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 5
- 239000010703 silicon Substances 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011863 silicon-based powder Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 235000011149 sulphuric acid Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
Definitions
- the invention relates to a method for producing an anodic oxide layer on an object consisting at least in a surface layer of a eutectic or hypereutectic AlSi alloy.
- Eutectic and hypereutectic AlSi alloys are also used to manufacture wear-resistant objects. Due to the high Si content on the alloy side, they contribute to increasing wear resistance. Highly Si-containing aluminum alloys can hardly be anodized, however, so that simultaneous corrosion protection in the form of a compact anodic oxide layer is not possible.
- the inventors have set themselves the goal of providing a method with which objects made of high-Si-containing aluminum alloys can be anodized.
- the particle size of the Si or Si-containing crystals in the surface layer of the object is brought to a size of about 5 ⁇ m by melting or melting before the anodic oxidation.
- the size of the Si precipitates in high Si-containing aluminum alloys which is usually on the order of 10 ⁇ m or more, makes it impossible to form a compact anodic oxide layer.
- the reason for this is that the crystals, which conduct electricity well, conduct it directly from the anode to the cathode in the anodizing bath and thus cause a short-circuit current, thereby preventing the formation of a compact anodic oxide layer.
- the particle reduction carried out according to the invention before the anodic oxidation now enables aluminum alloys with a high silicon content to be provided with a compact anodic oxide layer. This improves the corrosion behavior on the one hand and on the other hand increases the wear resistance by incorporating the Si-containing particles in the oxide layer.
- Si is introduced into the surface layer simultaneously with the melting or melting.
- the Si content of the surface layer is preferably at least 13% by weight of silicon.
- the particle size of the Si- or Si-containing crystals is expediently a maximum of 5 ⁇ m, in particular a maximum of 3 ⁇ m.
- the surface layer is preferably melted or melted using high-energy radiation, in particular by laser radiation.
- the laser radiation is expediently brought about by a CO2 laser.
- the high-energy radiation can also be electron radiation.
- An object made of an AlSi7 cast alloy was melted on the surface by a CO2 laser, at the same time aluminum-silicon powder was introduced into the melting zone, which bonded to the substrate.
- the laser beam was focused on the surface with a power of 1500 watts at 1 mm diameter and passed over the object at a speed of 2 meters per minute. This process was repeated 3 to 4 times, a 0.7 mm thick layer of aluminum with 13% by weight of silicon being built up. Then about 0.1 mm was mechanically turned off the porous surface and then the object was degreased and anodized in a sulfuric acid electrolyte with 200 g H2SO4 / liter at 20 C and 1.5 A / dm2 for 40 minutes. After the compression process in boiling water, the object had an oxide layer thickness of 12 ⁇ m.
- Example 2 The procedure was as in Example 1, but a composition of the aluminum / silicon powder was chosen such that the layer contained 25% by weight of silicon. Mechanical preparation, anodic oxidation and compression were carried out as in Example 1. The oxide layer thickness was 19 ⁇ m.
- Example 1 The procedure was again as in Examples 1 and 2, but the surface of the article was subjected to a heat treatment with the CO2 laser after the coating process. The object was then mechanically turned off, degreased and anodized as in Example 1.
Landscapes
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH3764/90 | 1990-11-28 | ||
| CH3764/90A CH682327A5 (OSRAM) | 1990-11-28 | 1990-11-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP0488944A1 true EP0488944A1 (de) | 1992-06-03 |
Family
ID=4262994
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91810864A Withdrawn EP0488944A1 (de) | 1990-11-28 | 1991-11-07 | Verfahren zum Anodisieren von ALSi-Legierungen |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0488944A1 (OSRAM) |
| CH (1) | CH682327A5 (OSRAM) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622476A1 (de) * | 1993-03-30 | 1994-11-02 | Alusuisse-Lonza Services Ag | Metallsubstrate mit laserinduzierter MMC-Beschichtung |
| EP0942075A1 (de) * | 1998-03-09 | 1999-09-15 | Hans u. Ottmar Binder GbR | Verfahren zur Oberfächenbehandlung von Aluminium, Aluminiumlegierungen, Magnesium oder Magnesiumlegierungen |
| DE102011055644A1 (de) | 2011-11-23 | 2013-05-23 | Verein zur Förderung von Innovationen durch Forschung, Entwicklung und Technologietransfer e.V. (Verein INNOVENT e.V.) | Verfahren zur Erzeugung einer schwarzen oxidkeramischen Oberflächenschicht auf einem Bauteil aus einer Leichtmetalllegierung |
| EP3118354A1 (de) * | 2015-07-14 | 2017-01-18 | Robert Bosch Gmbh | Verfahren zur erzeugung einer strukturierten oxidschicht sowie ein dadurch erzeugtes substrat |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2385810A1 (fr) * | 1977-03-28 | 1978-10-27 | Avco Everett Res Lab Inc | Procede de formation d'une couche superficielle d'alliage par fusion au laser d'un metal d'apport sur un substrat metallique |
| WO1982003814A1 (en) * | 1981-04-28 | 1982-11-11 | Plc Ae | Piston manufacture |
| EP0176803A1 (de) * | 1984-09-27 | 1986-04-09 | M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft | Verfahren zur Herstellung von Werkstücken aus Leichtmetall |
| EP0212938A2 (en) * | 1985-08-13 | 1987-03-04 | Toyota Jidosha Kabushiki Kaisha | Method for forming alloy layer upon aluminum alloy substrate by irradiating with a CO2 laser, on substrate surface, alloy powder containing substance for alloying and bismuth |
-
1990
- 1990-11-28 CH CH3764/90A patent/CH682327A5/de not_active IP Right Cessation
-
1991
- 1991-11-07 EP EP91810864A patent/EP0488944A1/de not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2385810A1 (fr) * | 1977-03-28 | 1978-10-27 | Avco Everett Res Lab Inc | Procede de formation d'une couche superficielle d'alliage par fusion au laser d'un metal d'apport sur un substrat metallique |
| WO1982003814A1 (en) * | 1981-04-28 | 1982-11-11 | Plc Ae | Piston manufacture |
| EP0176803A1 (de) * | 1984-09-27 | 1986-04-09 | M.A.N. MASCHINENFABRIK AUGSBURG-NÜRNBERG Aktiengesellschaft | Verfahren zur Herstellung von Werkstücken aus Leichtmetall |
| EP0212938A2 (en) * | 1985-08-13 | 1987-03-04 | Toyota Jidosha Kabushiki Kaisha | Method for forming alloy layer upon aluminum alloy substrate by irradiating with a CO2 laser, on substrate surface, alloy powder containing substance for alloying and bismuth |
Non-Patent Citations (1)
| Title |
|---|
| B.L.MORDIKE 'LASER TREATMENT OF MATERIALS' 1987 , DGM INFORMATIONSGESELLSCHAFT VERLAG , DUESSELDORF SEITEN 133-145 , P.L. ANTONA ET AL.: "LASER SURFACE REMELTING AND ALLOYING OF ALUMINIUM ALLOYS" * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0622476A1 (de) * | 1993-03-30 | 1994-11-02 | Alusuisse-Lonza Services Ag | Metallsubstrate mit laserinduzierter MMC-Beschichtung |
| CH686187A5 (de) * | 1993-03-30 | 1996-01-31 | Alusuisse Lonza Services Ag | Metallsubstrate mit laserinduzierter MMC-Beschichtung. |
| EP0942075A1 (de) * | 1998-03-09 | 1999-09-15 | Hans u. Ottmar Binder GbR | Verfahren zur Oberfächenbehandlung von Aluminium, Aluminiumlegierungen, Magnesium oder Magnesiumlegierungen |
| DE102011055644A1 (de) | 2011-11-23 | 2013-05-23 | Verein zur Förderung von Innovationen durch Forschung, Entwicklung und Technologietransfer e.V. (Verein INNOVENT e.V.) | Verfahren zur Erzeugung einer schwarzen oxidkeramischen Oberflächenschicht auf einem Bauteil aus einer Leichtmetalllegierung |
| EP3118354A1 (de) * | 2015-07-14 | 2017-01-18 | Robert Bosch Gmbh | Verfahren zur erzeugung einer strukturierten oxidschicht sowie ein dadurch erzeugtes substrat |
Also Published As
| Publication number | Publication date |
|---|---|
| CH682327A5 (OSRAM) | 1993-08-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK FR GB IT LI NL SE |
|
| 17P | Request for examination filed |
Effective date: 19921116 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
| 18D | Application deemed to be withdrawn |
Effective date: 19940531 |