EP3553208A1 - Procédé de fabrication d'un composant en aluminium ayant une surface colorée - Google Patents

Procédé de fabrication d'un composant en aluminium ayant une surface colorée Download PDF

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Publication number
EP3553208A1
EP3553208A1 EP18166369.1A EP18166369A EP3553208A1 EP 3553208 A1 EP3553208 A1 EP 3553208A1 EP 18166369 A EP18166369 A EP 18166369A EP 3553208 A1 EP3553208 A1 EP 3553208A1
Authority
EP
European Patent Office
Prior art keywords
salt
component
aluminum
electrolyte
electrolysis
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.)
Pending
Application number
EP18166369.1A
Other languages
German (de)
English (en)
Inventor
Holger Olaf STAUSBERG
Marco Sindermann
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.)
Rich Steinebach & Co KG GmbH
Plasman Europe AB
Original Assignee
Rich Steinebach & Co KG GmbH
Dura Operating LLC
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 Rich Steinebach & Co KG GmbH, Dura Operating LLC filed Critical Rich Steinebach & Co KG GmbH
Priority to EP18166369.1A priority Critical patent/EP3553208A1/fr
Priority to CN201910276532.0A priority patent/CN110359072A/zh
Priority to US16/378,057 priority patent/US20190309434A1/en
Publication of EP3553208A1 publication Critical patent/EP3553208A1/fr
Pending legal-status Critical Current

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    • 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
    • C25D11/20—Electrolytic after-treatment
    • C25D11/22—Electrolytic after-treatment for colouring layers
    • 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
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C25D11/08—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used containing inorganic acids
    • 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
    • C25D11/14—Producing integrally coloured layers
    • 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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/12—Electroplating: Baths therefor from solutions of nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/30—Electroplating: Baths therefor from solutions of tin

Definitions

  • the invention relates to a method for producing an aluminum component having a colored surface, wherein in the method, the surface of the component is anodized and a coloring component is applied by means of electrolysis. Furthermore, the invention relates to a component made of aluminum with a colored surface, which was produced by the method.
  • Aluminum and aluminum alloy components are widely used in the automotive field, for example in automotive bodies and also in decorative components, such as automotive components. Trims.
  • the surface of the aluminum is usually first provided by anodic oxidation with an oxidic protective layer (anodizing process). Subsequently, the oxide layers formed can be colored, for example with organic or inorganic dyes.
  • the organic dyes have the disadvantage that they are not UV-stable, so that the surface is visually unsightly after some time.
  • the electrolytic dyeing is the electrolytic dyeing (Colinalphallose).
  • the electrolyte contains a coloring metal salt, usually tin (II) sulfate.
  • II tin
  • the metal ions penetrate into the pores of the layer and the pores filled with metal cause a light-fast coloration through uptake and scattering effects.
  • the disadvantage is that an intensive and uniform coloration can be achieved only with relatively high layers of over 12 microns. Because of the different expansion coefficient between the metal of the component and the overlying layers, especially at high temperatures, the applied layers flake off and the corrosion resistance of the metal deteriorates.
  • the aluminum components are often powder-coated.
  • the disadvantage is that especially at corners and edges, the powder-coated paint peels off quickly.
  • the powder coating does not show the typical metal surface that many customers want.
  • the object of the invention is therefore to provide a method for producing an aluminum component with a colored surface, which is able to produce a stable and UV-resistant colored layer with a large color depth. Another object is to provide a component with such a colored layer, which is in particular part of a motor vehicle and particularly preferably part of the body of a motor vehicle or an attachment for attachment to the body of a motor vehicle.
  • the combination of two or more metal salts in the electrolytic dyeing of anodized layers makes it possible to obtain a density and color-intensive coloring on the aluminum surface.
  • the layers are relatively thin, so that the difference in the expansion coefficient of the coating and the metal at high temperatures or even at low temperatures barely noticeable and the coating remains essentially intact.
  • the new method is particularly suitable for coloring aluminum components of all kinds, wherein the term aluminum component and components or other parts made of aluminum and aluminum alloys are to be understood.
  • Components may be in particular a component of a motor vehicle and particularly preferably part of the body of a motor vehicle or an attachment for attachment to the body of a motor vehicle.
  • the aluminum component is anodized in a first process step.
  • the anodization can be done in a known manner.
  • Anodizing forms an oxidic protective layer on the aluminum surface.
  • This layer is finely crystalline and has pores, which absorb the coloring substance in the next step.
  • This coloring layer is applied in the next step by means of electrolysis.
  • the electrolyte contains, as one component, an Sn salt in combination with a salt of a further bivalent metal.
  • the above-mentioned divalent metal salt is preferably selected from salts of Ni, Co, Cu, Mn and / or Fe. Suitable are all water-soluble salts, in particular halides and sulfates. It has been found that with a combination of an Sn salt and a further metal salt, even at a relatively low layer thickness, a dense colored layer can be produced.
  • a particularly preferred combination is the use of a Sn (II) salt with a Ni (II) salt, in particular the use of SnSO4 and NiSO4.
  • the two salts are added to the electrolyte in a manner known per se.
  • the Sn salt is preferably present in the electrolyte or in the electrolyte solution in a concentration of 0.1 to 15 g / L.
  • the concentration of the further metal salt is preferably between 2 to 200 g / l. Particularly good results in terms of color depth and stability are achieved when the Sn salt is present in an amount between 1 and 10 g / L and the other salt in an amount between 30 and 150 g / L in the electrolyte.
  • the Sn salt and the further metal salt are preferably present in a weight ratio of between 1:20 and 1: 200, in particular between 1:30 to 1: 100.
  • the coloring electrolysis can be carried out in a known manner, preferably AC voltage is applied.
  • the electrolyte contains, as further components, sulfuric acid, ferrous sulfate, sulfophthalic acid, sulfosalicylic acid.
  • the pH of the electrolyte is preferably between above 1, in particular ⁇ 1 to 2.
  • the electrolysis is preferably carried out at temperatures from room temperature to slightly elevated temperature to about 22 ° C. Usually, the electrolytic dyeing is done with AC voltage.
  • a particular advantage of the present invention is that by combining two or more metal salts, a colored surface having a deep coloration can be obtained.
  • the layer thickness of this electrolytically applied layer is preferably between 6 and 11 .mu.m, in particular between 6 and 10 .mu.m.
  • the small layer thickness has the further advantage that the electrolysis can be carried out in a much shorter time than by the methods known from the prior art, so the process duration of the electrolytic coloring could be reduced by 30%.
  • An aluminum component anodized according to the prior art method was placed in an electrolytic bath.
  • the electrolyte contained 5 g / l, sulfuric acid, 100 g / l nickel sulfate * 6H20 1.7 g / l ferrous sulfate, stannous sulfate 2 g / l, sulfophtalic acid SSA 15 g / l the temperature was 20 ° C.
  • an alternating voltage of 15-18V was applied.
  • the electrolysis was carried out for a period of 10 minutes.
  • the component was removed from the electrolysis bath, rinsed and introduced in a known manner in a VE hot water compression 15 min.
  • the anodized layer was compacted here by the incorporation of water and the associated volume expansion.
  • the component from the electrolysis is subjected to the sol-gel process in a final process step, wherein a coating having a layer thickness of 2.5 microns was applied.
  • FIG. 1 a coating which can be prepared by the process according to the invention.
  • the coloring component is deposited by electrolysis, the electrolyte being a salt solution of an Sn salt and another divalent metal salt.
  • the electrolyte being a salt solution of an Sn salt and another divalent metal salt.
  • An anodized layer containing alumina and the two metals deposited during the electrolysis is obtained.
  • a cover layer is applied by means of a sol / gel process.
EP18166369.1A 2018-04-09 2018-04-09 Procédé de fabrication d'un composant en aluminium ayant une surface colorée Pending EP3553208A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18166369.1A EP3553208A1 (fr) 2018-04-09 2018-04-09 Procédé de fabrication d'un composant en aluminium ayant une surface colorée
CN201910276532.0A CN110359072A (zh) 2018-04-09 2019-04-08 生产具有着色表面的铝部件的方法
US16/378,057 US20190309434A1 (en) 2018-04-09 2019-04-08 Method for producing an aluminium component having a coloured surface

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18166369.1A EP3553208A1 (fr) 2018-04-09 2018-04-09 Procédé de fabrication d'un composant en aluminium ayant une surface colorée

Publications (1)

Publication Number Publication Date
EP3553208A1 true EP3553208A1 (fr) 2019-10-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP18166369.1A Pending EP3553208A1 (fr) 2018-04-09 2018-04-09 Procédé de fabrication d'un composant en aluminium ayant une surface colorée

Country Status (3)

Country Link
US (1) US20190309434A1 (fr)
EP (1) EP3553208A1 (fr)
CN (1) CN110359072A (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3773631A (en) * 1970-10-16 1973-11-20 Blasberg Gmbh & Co Kg Friedr Aqueous electrolytic bath for coloring anodic oxide layers on aluminum and aluminum alloy substrates and process for coloring said substrates
US3787295A (en) * 1970-04-02 1974-01-22 Alusuisse Method of electrolytic coloring of oxide layers on aluminum and aluminum base alloys
AT340219B (de) * 1975-05-13 1977-12-12 Keller Eberhard Verfahren zum erzeugen von kombinationsfarbungen auf einem werkstuck aus aluminium oder aluminiumlegierungen
US4226680A (en) * 1977-06-06 1980-10-07 Alcan Research And Development Limited Process for electrolytic coloration of anodized aluminium
US4310586A (en) * 1978-01-17 1982-01-12 Alcan Research And Development Limited Aluminium articles having anodic oxide coatings and methods of coloring them by means of optical interference effects
US4401525A (en) * 1978-11-18 1983-08-30 Th. Goldschmidt Ag Process for coloring aluminum electrolytically with metal salts
EP0354365A1 (fr) * 1988-07-19 1990-02-14 Henkel Kommanditgesellschaft auf Aktien Procédé de coloration électrolytique de surfaces en aluminium anodisées avec des sels métalliques
EP2824221A1 (fr) * 2013-07-12 2015-01-14 Eloxal Höfler GmbH Procédé de fabrication d'un substrat d'aluminium résistant à la corrosion et à l'usure

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2219437B1 (fr) * 1973-02-23 1975-08-22 Pechiney Aluminium
CA1049949A (fr) * 1975-06-09 1979-03-06 Eberhard Keller Methode de coloration combinee sur pieces d'aluminium ou d'alliages d'aluminium
JPS5228436A (en) * 1975-08-29 1977-03-03 Shokosha Kk Dyeing process for aluminum and its alloy
JPS61113781A (ja) * 1984-11-08 1986-05-31 Tokuyama Soda Co Ltd 水素発生用陰極
US20050056546A1 (en) * 2003-09-17 2005-03-17 Kia Sheila Farrokhalaee Aluminum vehicle body
US20050173255A1 (en) * 2004-02-05 2005-08-11 George Bokisa Electroplated quaternary alloys
CN102424999B (zh) * 2011-12-02 2016-04-13 沈阳工业大学 一种铝合金阳极氧化膜电解着黑色的处理方法
CN102534721B (zh) * 2012-02-17 2015-03-25 上海安美特铝业有限公司 太阳能选择性吸收膜的制备方法
AT514447B1 (de) * 2013-06-28 2015-10-15 Pramer Gerhard Dipl Ing Fh Verfahren zur elektrochemischen Herstellung spektral selektiver Absorberschichten auf einem Aluminiumsubstrat
FR3068712B1 (fr) * 2017-07-10 2021-10-01 Constellium Rolled Products Singen Gmbh & Co Kg Produit lamine en alliage d’aluminium ayant des couleurs iridescentes intenses

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3787295A (en) * 1970-04-02 1974-01-22 Alusuisse Method of electrolytic coloring of oxide layers on aluminum and aluminum base alloys
US3773631A (en) * 1970-10-16 1973-11-20 Blasberg Gmbh & Co Kg Friedr Aqueous electrolytic bath for coloring anodic oxide layers on aluminum and aluminum alloy substrates and process for coloring said substrates
AT340219B (de) * 1975-05-13 1977-12-12 Keller Eberhard Verfahren zum erzeugen von kombinationsfarbungen auf einem werkstuck aus aluminium oder aluminiumlegierungen
US4226680A (en) * 1977-06-06 1980-10-07 Alcan Research And Development Limited Process for electrolytic coloration of anodized aluminium
US4310586A (en) * 1978-01-17 1982-01-12 Alcan Research And Development Limited Aluminium articles having anodic oxide coatings and methods of coloring them by means of optical interference effects
US4401525A (en) * 1978-11-18 1983-08-30 Th. Goldschmidt Ag Process for coloring aluminum electrolytically with metal salts
EP0354365A1 (fr) * 1988-07-19 1990-02-14 Henkel Kommanditgesellschaft auf Aktien Procédé de coloration électrolytique de surfaces en aluminium anodisées avec des sels métalliques
EP2824221A1 (fr) * 2013-07-12 2015-01-14 Eloxal Höfler GmbH Procédé de fabrication d'un substrat d'aluminium résistant à la corrosion et à l'usure

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US20190309434A1 (en) 2019-10-10
CN110359072A (zh) 2019-10-22

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