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
• • 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
  • C23C24/00—Coating starting from inorganic powder
  • C23C24/02—Coating starting from inorganic powder by application of pressure only
  • C23C24/04—Impact or kinetic deposition of particles
• • 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
  • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
  • C23C28/32—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer
  • C23C28/322—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one pure metallic layer only coatings of metal elements only
• • 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
  • C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
  • C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
  • C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
• • 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

Definitions

• the invention relates to a method for the decorative anodic oxidation of surfaces of aluminum alloys and components of such alloys with a decorative anodic oxide layer.
• the invention relates to a process for the decorative anodic oxidation of wrought aluminum alloys and cast aluminum alloys.
• Aluminum and aluminum alloys have the property that an oxide layer forms on contact with the air through the oxygen, which is about 0.01 microns thick.
• Anodizing referred to as anodizing, allows the formation of oxide layers that are 100 to 1000 times thicker and can serve as a protective layer against mechanical, chemical, and electrochemical stresses on components made from the aluminum alloy.
• Anodic oxide layers have a honeycomb structure with closed bottom, but upwardly open microporous channels in which dyes can be incorporated.
• the pores in the surface caused by the channels can be closed by aftertreatment processes. This is done by forming in the pores Aluminiumoxihydroxid, which causes a closure of the pores because of its larger volume.
• Aluminiumoxihydroxid which causes a closure of the pores because of its larger volume.
• the formation of aluminum oxyhydroxide is achieved, for example, by treating the surface with boiling water, steam or special solutions.
• self-coloration of the anodic oxide layer can be achieved by using specially alloyed aluminum materials. Both possibilities are known as decorative anodic oxidation or color anodizing.
• the decorative anodic oxidation is well possible only with pure aluminum and some aluminum alloys, such as Al-Mg with magnesium contents up to 5%.
• the size Group of silicon-containing cast aluminum materials is considered not to be color-codeable. It is believed that the formation of a brilliantly colored oxide layer by the precipitation of silicon or silicon-containing intermetallic phases such as AISi,. Mg 2 Si, etc. is prevented. For the formation of AIFeSi phases, even the small amounts of iron, which are present as an impurity in the material, are sufficient, for example, already 0.08%.
• the silicon-containing aluminum materials used for casting according to DIN standard 1725 with the alloy designations AISi12, AISi12 (Cu), AISi10Mg, AISi10Mg (Cu), AISi9Cu3, AISi6Cu4, AlSi11, AISi9Mg, and AISi7Mg are not suitable for anodic oxidation.
• AISi9MgCo, AISi12CuMgNi and AIZn10Si8Mg but also materials with no or only small amounts of silicon such as AICu4Ti and AICu4TiMg are only badly suited.
• the anodic oxidation of cast alloys is made more difficult since they usually still have pores. Even with many Aluminiumknetmaschinestoffen anodic oxidation is not well possible.
• thermal spraying methods allow evenly applied coatings of high quality and quality.
• the spray materials can be supplied in the form of wires, rods or as a powder.
• a particularly advantageous method is the so-called cold gas spraying, in which the spray particles are accelerated to high speeds in a carrier gas, but are not melted.
• a "cold" or a comparatively colder gas is used, since it is heated at most to temperatures below the melting point de material of the spray particles.
• cold gas spraying does not lead to oxidation and / or phase transformation of the carrier material or to a noticeable melting of the carrier material and the formation of a mixture.
• the spray particles are supplied as powders with a particle size of 1 .mu.m to 200 .mu.m.
• the kinetic energy receives the spray particles by acceleration in the carrier gas at speeds above the speed of sound.
• the present invention has for its object to provide a method by which it is possible, even surfaces of aluminum alloys in which a decorative anodic oxidation is not possible to decorative anodic oxidation. It is also an object of the invention to provide anodically oxidized aluminum components of such alloys.
• the stated object is achieved by a method in which, in a first step, a layer of anodically oxidizable aluminum material is applied and in a second step, the layer of aluminum material is anodized
• the layer of anodic oxidizable aluminum material may consist of an alloy optimized for this purpose.
• the layer of aluminum material is applied by cold gas spraying.
• the coating with the anodic oxidizable aluminum material can be carried out by thermal spraying. If the cold gas spraying process is used, thorough mixing of the carrier material made of aluminum alloy or cast aluminum alloys and the coating of aluminum material by melting or solid-state diffusion is largely avoided. The surface of the component is optimally suited for anodic oxidation after coating.
• the method can be advantageously used.
• the layer of aluminum material consists of pure aluminum. Pure aluminum is made of 99.5 percent aluminum. Possible is an increase up to 99.99 percent. Pure aluminum can be optimally oxidized anodically.
• the object of the invention is also achieved by components of Aluminiumknet- or cast aluminum alloys whose surface has been coated at least in some areas with the inventive method.

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• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Inorganic Chemistry (AREA)
• Electrochemistry (AREA)
• Other Surface Treatments For Metallic Materials (AREA)

Applications Claiming Priority (1)

Publications (1)

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Family Applications (1)

Country Status (2)

Cited By (1)

Families Citing this family (1)

• 2006
  • 2006-03-07 DE DE200610010520 patent/DE102006010520A1/de not_active Withdrawn
• 2007
  • 2007-02-13 EP EP07003051A patent/EP1832670A2/fr not_active Withdrawn

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