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WO2006134065A1 - Procede d'etancheification de pieces d'aluminium resultant d'une oxydation anodique - Google Patents

Procede d'etancheification de pieces d'aluminium resultant d'une oxydation anodique Download PDF

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Publication number
WO2006134065A1
WO2006134065A1 PCT/EP2006/063019 EP2006063019W WO2006134065A1 WO 2006134065 A1 WO2006134065 A1 WO 2006134065A1 EP 2006063019 W EP2006063019 W EP 2006063019W WO 2006134065 A1 WO2006134065 A1 WO 2006134065A1
Authority
WO
WIPO (PCT)
Prior art keywords
chromium
liquid bath
iii
compaction
aluminum
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.)
Ceased
Application number
PCT/EP2006/063019
Other languages
German (de)
English (en)
Inventor
Martin Nader
Michael Fritsche
Christian Junker
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.)
Continental Teves AG and Co OHG
Original Assignee
Continental Teves AG and Co OHG
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 Continental Teves AG and Co OHG filed Critical Continental Teves AG and Co OHG
Publication of WO2006134065A1 publication Critical patent/WO2006134065A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers

Definitions

  • the invention relates to a new method for compacting anodically oxidized aluminum workpieces.
  • the corrosion resistance and the wear resistance of aluminum workpieces can be improved by anodization, since a hard and chemically stable oxide layer is formed by this process, which builds up on a so-called barrier layer.
  • the oxide layer has a porous dendritic structure.
  • the porous structure can be closed by a downstream compression process. For example, it is possible to immerse anodized workpieces in a dye bath, so that dye penetrates into fine capillaries. Subsequent compaction permanently entrap the dye to form a colored and chemically stable aluminum surface with closed capillaries.
  • Hot compacting is usually preferred.
  • the compression process is carried out in the dipping process using a hot liquid bath.
  • the liquid bath contains principle of boiling water at a bath temperature of for example about 100 0 C.
  • Sealinggifte silicates, phosphates and phosphonates
  • the pH is between about 5.8-6.3.
  • Special compaction formulations contain nickel or cobalt-containing salt solutions such as, for example, nickel acetate and boric acid or bichromate.
  • Kaltimlessnessgnier compiler have the significant disadvantage that the layer has an increased tendency to micro cracking.
  • the mechanical quality of these Kaltimponiaginiervon is therefore capable of improvement.
  • downstream of a cold impregnation followed by a hot compression requires treatment baths for hot and cold processes, which causes a further increased equipment complexity and consequently further increased operating costs.
  • the invention is based on the idea of compacting an anodically oxidized workpiece by electroless immersion in a chromium (III) -containing liquid bath. Finally, the workpiece is dried with or without intermediate rinsing steps.
  • the invention enables economical compaction of anodized aluminum surfaces, avoiding hexavalent chromium, by also reducing the cost of compaction. A tendency to microcracking should be avoided.
  • the concentration of the chromium (III) -containing reagent, or chromium (III), in the solution for the densification process may be between about 10-2000 mg / 1, and it has been found that with about 100-300 mg / 1 chromium (III) particularly good and also economic results with an advantageously long bath life can be achieved. In addition, increased concentrations do not allow appreciably improved corrosion resistance under the given boundary conditions.
  • the temperature of the sealing bath can in principle be between 20 - 8O 0 C., a temperature range of about 3O 0 C - 4O 0 C is preferred. Due to the reduced process temperature results in comparison with conventional compression processes an energetically economical process management with reduced energy consumption and improved corrosion properties.
  • the pH of the densification bath becomes acidic between about - A -
  • the duration of the overall process is advantageously reduced in comparison with prior art solutions by providing a wetting time of between about 10 to 600 seconds for the densification step. Longer stays are also possible.
  • the treatment time can be reduced by a higher bath temperature.
  • the proposed method differs quite significantly from conventional compression methods, in which a treatment time of about 2-3 minutes per micron layer thickness is provided.
  • the invention enables a process acceleration by greatly accelerating the step of compressing the oxidation layer.
  • a filtration is advantageous.
  • a bath movement for example, by air injection or similar processes allows a uniform incorporation of Cr (III).
  • the bath approach is also resistant to introduction and carryover as in particular against silting with aluminum material.
  • the compaction bath compensates for contaminating entry from the eloxal bath to a concentration of more than 50 ml / l without affecting the results of corrosion resistance.
  • the compression process can be carried out in the dipping method as well as in the spraying method. In any case, care must be taken to ensure adequate and complete wetting of the workpieces.
  • the dipping method is particularly suitable in connection with a sufficient bath movement and / or filtration, which provides security against segregation processes and contamination.
  • the method allows both an anodized casting skin surface, as well as on a machined Workpiece surface especially in the edge region improved corrosion protection.
  • chromium-containing reagents intended for passivation of metal materials are particularly suitable for serving as a basis for the application of baths for the compaction of anodized coatings.
  • a compression treatment at room temperature is possible - an optimized compaction efficiency has been demonstrated by salt spray tests but for a slightly elevated temperature range above 20 0 C and in particular between about 3O 0 C to 40 0 C. In this context, corrosion resistances were detected for over 1008 hours.
  • the use of the invention can be detected by means of chemical-metallurgical analyzes if a layer system is present on the aluminum base material which, in addition to the anodically produced ceramic aluminum oxide layer (Al 2 O 3 ), also contains chromium (III) constituents.
  • housing parts made of the casting material AlSi7Mg were anodized, rinsed and dried and then compacted essentially cold according to the present method.
  • the following table shows the treatment parameters and measurements as follows.
  • the concentration of chromium-containing substance is given in ml / l.
  • the bath temperature T of the compression bath in 0 C, the pH and the treatment time t in minutes communicated.
  • the anodized layer thickness is given in ⁇ m, whereby a microscopic layer thickness measurement according to DIN EN ISO 1463 is used.
  • the corrosion resistance is measured according to the salt spray test (SST) according to DIN 50 021 SS in hours for the purpose of assessing base metal corrosion. Because it is in the present case aluminum material, impermissible base material corrosion is recognizable on so-called white rust.
  • 1 illustrates the relationship between the pH of the liquid bath as a function of the corrosion resistance in hours according to salt spray test according to DIN 50 021 SS at a concentration of the CrIII-containing reagent in the amount of about 200 mg / l. It can be seen that optimum corrosion resistance in a range of pH between about 2.5 to 4 is expected. Above pH 4.1, corrosion resistance tends to decrease due to flocculation in the compression bath. Below about pH 2.5, undesirable precipitations result from the liquid bath.

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

L'invention concerne un procédé d'étanchéification, se faisant en grande partie à froid, de pièces d'aluminium résultant d'une oxydation anodique, procédé caractérisé en ce que l'étanchéification de la couche obtenue suivant le procédé Eloxal s'effectue par trempage, sans courant extérieur, dans un bain liquide, en ce que le bain liquide présente un réactif contenant du chrome (III+), et en ce que les fractions de chrome (III+) sont incorporées dans la couche Eloxal. Les pièces sont ensuite séchées, ce séchage étant suivi d'une ou de plusieurs phases de rinçage. Le procédé permet d'éviter l'utilisation de chrome hexavalent (chrome VI+), du fait que le nouveau procédé a recours à l'incorporation de chrome trivalent (chrome III+). De plus, le procédé selon l'invention permet une étanchéification rapide et économique et ceci, à des températures nettement réduites.
PCT/EP2006/063019 2005-06-15 2006-06-08 Procede d'etancheification de pieces d'aluminium resultant d'une oxydation anodique Ceased WO2006134065A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102005027769 2005-06-15
DE102005027769.1 2005-06-15
DE102005059748.3 2005-12-14
DE102005059748.3A DE102005059748B4 (de) 2005-06-15 2005-12-14 Verfahren zur Verdichtung anodisch oxidierter Aluminiumwerkstücke

Publications (1)

Publication Number Publication Date
WO2006134065A1 true WO2006134065A1 (fr) 2006-12-21

Family

ID=36809663

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/063019 Ceased WO2006134065A1 (fr) 2005-06-15 2006-06-08 Procede d'etancheification de pieces d'aluminium resultant d'une oxydation anodique

Country Status (2)

Country Link
DE (1) DE102005059748B4 (fr)
WO (1) WO2006134065A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987417A (en) * 1958-06-23 1961-06-06 Aluminum Co Of America Pigmenting aluminum oxide coating
US4084014A (en) * 1976-10-05 1978-04-11 Juan Brugarolas Fabregas Process for sealing anodic oxidation layers on aluminium surfaces and its alloys
US5374347A (en) * 1993-09-27 1994-12-20 The United States Of America As Represented By The Secretary Of The Navy Trivalent chromium solutions for sealing anodized aluminum
WO2003040437A1 (fr) * 2001-11-06 2003-05-15 The United States Of America As Represented By The Secretary Of The Navy Post-traitement d'aluminium anodise
EP1369503A2 (fr) * 2002-05-22 2003-12-10 United Technologies Corporation Traitement de surface résistant à la corosion pour collage structurel à des surfaces métalliques
EP1378585A1 (fr) * 2002-06-27 2004-01-07 United Technologies Corporation Revêtement par conversion de la chrome trivalente qui est phosphaté et résistant à la corrosion

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58197293A (ja) * 1982-05-10 1983-11-16 Tookaro Kk 耐摩耗性ならびに耐食性に優れる繊維機械部品
GB8802788D0 (en) * 1988-02-08 1988-03-09 Brent Chemicals Int Composition & process for treating metal surfaces
JP2004060044A (ja) * 2002-07-30 2004-02-26 Koyo Kinzoku Boshoku:Kk アルミニウムの表面処理法およびアルミニウム材

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987417A (en) * 1958-06-23 1961-06-06 Aluminum Co Of America Pigmenting aluminum oxide coating
US4084014A (en) * 1976-10-05 1978-04-11 Juan Brugarolas Fabregas Process for sealing anodic oxidation layers on aluminium surfaces and its alloys
US5374347A (en) * 1993-09-27 1994-12-20 The United States Of America As Represented By The Secretary Of The Navy Trivalent chromium solutions for sealing anodized aluminum
WO2003040437A1 (fr) * 2001-11-06 2003-05-15 The United States Of America As Represented By The Secretary Of The Navy Post-traitement d'aluminium anodise
EP1369503A2 (fr) * 2002-05-22 2003-12-10 United Technologies Corporation Traitement de surface résistant à la corosion pour collage structurel à des surfaces métalliques
EP1378585A1 (fr) * 2002-06-27 2004-01-07 United Technologies Corporation Revêtement par conversion de la chrome trivalente qui est phosphaté et résistant à la corrosion

Also Published As

Publication number Publication date
DE102005059748B4 (de) 2020-03-19
DE102005059748A1 (de) 2006-12-21

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