EP4377500A1 - Procédé de production d'un article en aluminium anodisé - Google Patents

Procédé de production d'un article en aluminium anodisé

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Publication number
EP4377500A1
EP4377500A1 EP22747289.1A EP22747289A EP4377500A1 EP 4377500 A1 EP4377500 A1 EP 4377500A1 EP 22747289 A EP22747289 A EP 22747289A EP 4377500 A1 EP4377500 A1 EP 4377500A1
Authority
EP
European Patent Office
Prior art keywords
rinsing
sec
solution
pickling
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.)
Pending
Application number
EP22747289.1A
Other languages
German (de)
English (en)
Inventor
Stefan VON PIDOLL
Martin Fiedler
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP4377500A1 publication Critical patent/EP4377500A1/fr
Pending 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
    • C25D11/06—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
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/32—Alkaline compositions
    • C23F1/36—Alkaline compositions for etching aluminium or alloys thereof
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/22—Light metals
    • 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
    • C25D11/12—Anodising more than once, e.g. in different baths
    • 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
    • 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

Definitions

  • the invention relates to a method for producing an anodized aluminum article.
  • Corresponding methods for producing an anodized aluminum article are well known in the art and typically involve an anodizing step in which an aluminum substrate is subjected to an electrochemical anodizing process to form an aluminum article to be produced.
  • the anodizing step is typically carried out in an anodizing bath containing an anodizing solution acting as an electrolyte.
  • the aluminum substrate is typically connected as the anode and a container holding the anodizing solution as the cathode, whereby when appropriate electrical voltages are applied to the aluminum substrate forming the anode and the container forming the cathode, oxygen is generated on the surface of the aluminum substrate, which is Surface of the aluminum substrate reacts with aluminum ions to form aluminum oxide and thus forms an aluminum oxide layer on the surface of the aluminum substrate or converts the surface of the aluminum substrate into an aluminum oxide layer.
  • anodized aluminum items with fundamentally satisfactory properties can be produced using known anodizing processes, there is a need for further development of the anodizing processes with regard to efficient, reproducible production of anodized aluminum items with special properties, such as e.g. B. with particularly matt or non-reflective surfaces.
  • the invention is therefore based on the object of specifying an improved method for producing an anodised aluminum article with which anodised aluminum articles with special properties, such as e.g. B. with particularly matt or non-reflective surfaces, can be produced efficiently and reproducibly.
  • a first aspect of the invention relates to a method for producing at least one anodized aluminum article.
  • the method and the individual method steps are used to produce at least one anodized aluminum article.
  • An anodized aluminum article generally means an aluminum article, e.g. B. in the form of a technical component, the surface of which is at least partially, optionally completely, formed by an electrochemical anodizing process Aluminum oxide layer is formed or has such. It goes without saying that the process can be used to produce a number of anodised aluminum articles, in particular in a simultaneous or staggered sequence.
  • An anodized aluminum article that can be produced or produced according to the method can be a semi-finished product (semi-finished product) or a finished product (complete product); as a semi-finished product, the anodized aluminum article may undergo one or more post-processing steps to transform the semi-finished product into a finished product.
  • a first method step typically sees a pickling step or pickling process of a provided aluminum substrate in a pickling bath, which contains a pickling solution, i. H. in particular an aqueous pickling solution contains before.
  • a pickling solution i. H. in particular an aqueous pickling solution contains before.
  • the result of carrying out the first process step is a pickled aluminum substrate.
  • Pickling is used to prepare the aluminum substrate for the subsequent anodizing step or process.
  • the first process step can be carried out in a pickling device which includes a pickling bath containing a corresponding pickling solution.
  • the first method step several aluminum substrates can be provided, which are subjected to a pickling step or pickling process in a corresponding step of the method.
  • a pickling step or pickling process in a corresponding step of the method.
  • the method is described below in connection with an aluminum substrate, the same naturally applies to a number of aluminum substrates. Consequently, several aluminum substrates can be treated or processed in each step of the method, in particular simultaneously.
  • a second method step provides for a first rinsing step of the pickled aluminum substrate in a first rinsing bath which contains a first rinsing solution, ie in particular a first aqueous rinsing solution.
  • the pickled aluminum substrate is then subjected to a first rinsing step or rinsing process in a first rinsing bath containing a first rinsing solution.
  • the result of carrying out the second process step is a rinsed aluminum substrate; After the first rinsing step or rinsing process, the aluminum substrate is largely free of the pickling solution, which would have a negative effect on the subsequent method or process steps.
  • the second method step can be carried out in a first rinsing device which comprises a first rinsing bath containing a corresponding first rinsing solution.
  • a third process step sees a second rinsing step of the pickled aluminum substrate rinsed in the first rinsing bath in a second rinsing bath containing a second rinsing solution, i. H. in particular a second aqueous rinsing solution.
  • the aluminum substrate which has been pickled and rinsed in the first rinsing bath is then subjected to a second rinsing step or rinsing process in a second rinsing bath containing a second rinsing solution.
  • the result of carrying out the third process step is a particularly thoroughly rinsed aluminum substrate; After the third rinsing step or rinsing process, the aluminum substrate is typically (almost) completely free of the pickling solution, which, as mentioned, would have a negative effect on the subsequent method or process steps.
  • the third method step can be carried out in a second rinsing device which comprises a second rinsing bath containing a corresponding second rinsing solution.
  • a fourth process step provides a desmutting step of the aluminum substrate rinsed in the second rinsing bath in a desmutting bath containing a desmutting solution, i. H. in particular an aqueous pickling solution contains.
  • the aluminum substrate which has been pickled and rinsed in the first and second rinsing bath is then subjected to a pickling step or pickling process in a pickling bath containing a pickling solution.
  • the result of carrying out the fourth process step is a pickled aluminum substrate. Pickling is used to prepare the aluminum substrate for the subsequent anodizing step or process.
  • the fourth method step can be carried out in a desmutting device which comprises a desmutting bath containing a suitable desmutting solution.
  • a fifth method step provides for a third rinsing step of the pickled aluminum substrate in a third rinsing bath which contains a third rinsing solution, ie in particular a third aqueous rinsing solution.
  • the pickled aluminum substrate is then subjected to a third rinsing step or rinsing process in a third rinsing bath containing a third rinsing solution.
  • the result of carrying out the fifth process step is a rinsed pickled aluminum substrate; After the third rinsing step or rinsing process, the aluminum substrate is largely free of the pickling solution, which would have a negative effect on the subsequent method or process steps.
  • the fifth step in the process can be carried out in a third rinsing device which comprises a third rinsing bath containing a corresponding third rinsing solution.
  • a sixth process step sees a fourth rinsing step of the pickled aluminum substrate rinsed in the third rinsing bath in a fourth rinsing bath containing a fourth rinsing solution, i. H. in particular a fourth aqueous rinsing solution.
  • the aluminum substrate which has been stripped and rinsed in the third rinsing bath is then subjected to a fourth rinsing step or rinsing process in a fourth rinsing bath containing a fourth rinsing solution.
  • the result of carrying out the sixth process step is a particularly thoroughly rinsed aluminum substrate; After the fourth rinsing step or rinsing process, the aluminum substrate is typically (almost) completely free of the pickling solution, which, as mentioned, would have a negative effect on the subsequent method or process steps.
  • the sixth method step can be carried out in a fourth rinsing device which comprises a fourth rinsing bath containing a corresponding fourth rinsing solution.
  • a seventh method step now sees at least one anodizing step in at least one anodizing bath, which contains an anodizing solution, i. H. in particular an aqueous anodizing solution, whereby an anodized aluminum article is formed from the aluminum substrate.
  • the aluminum substrate which has been stripped and rinsed in the third and fourth rinsing bath, is then subjected to an anodizing step or anodizing process in an anodizing bath containing an anodizing solution.
  • the result of carrying out the seventh process step is an anodized aluminum item with a particularly matt and non-reflective surface.
  • the seventh method step can be carried out in an anodizing device which includes an anodizing bath containing a suitable anodizing solution.
  • the aluminum substrate can act as an anode and an anodizing solution, e.g. B. trough-like or -shaped, container can be connected as a cathode, whereby when appropriate electrical voltages are applied to the aluminum substrate forming the anode and the container forming the cathode, oxygen is generated on the surface of the aluminum substrate, which oxygen on the surface of the aluminum substrate with aluminum ions Aluminum oxide reacts and thus forms an aluminum oxide layer on the surface of the aluminum substrate or converts the surface of the aluminum substrate into an aluminum oxide layer.
  • the anodizing step or process therefore includes electrochemical processes to form a corresponding aluminum oxide layer.
  • An eighth method step provides at least one further rinsing step in at least one further rinsing bath which contains a further rinsing solution, ie in particular a further aqueous rinsing solution.
  • the anodized aluminum article is then subjected to at least one further rinsing step or rinsing process in at least one further rinsing bath containing a further rinsing solution.
  • the result of carrying out the eighth process step is a rinsed anodised aluminum article; the anodized aluminum article is typically (almost) completely free of the anodizing solution after the at least one further rinsing step or rinsing process.
  • the eighth method step can be carried out in at least one further rinsing device which comprises a further rinsing bath containing a corresponding further rinsing solution.
  • the aluminum substrate was rinsed several times in separate rinsing baths or rinsing solutions before the actual anodizing step or process, so that substances that were potentially harmful to the anodizing step or process and the associated anodizing result were removed from the aluminum substrate. Furthermore, as will be seen below, it is noteworthy that the aluminum substrate can be anodized in several separate anodizing baths, which results in special surface properties of the aluminum article to be produced or produced.
  • the sequence of process steps described enables an efficient, reproducible production of anodized aluminum items with special properties, i. H. especially with particularly matt or non-reflective surfaces.
  • the anodized aluminum article produced according to the method thus has a matt, non-reflecting surface.
  • All method steps can be carried out at least partially, optionally completely, in an automated manner or in an automated manner.
  • a system set up for carrying out the method can have facilities, d. H. in particular pickling devices, rinsing devices, pickling devices and anodizing devices, which enable the process step to be carried out at least partially, optionally completely, in an automated or automated manner.
  • the operation of respective devices can be controlled via a hardware and/or software-implemented control device, which is set up to generate control information for controlling the operation of respective devices and is connected to the respective devices, i. H. in particular the control devices assigned to the respective devices.
  • a degreasing step of the provided aluminum substrate may be performed to degrease the aluminum substrate.
  • Degreasing the aluminum substrate typically leads to a better pickling result, as organic substances can be at least partially, optionally completely, removed from the aluminum substrate.
  • the degreasing step can be carried out by immersing the aluminum substrate provided at least in sections, in particular completely, one or more times in a degreasing bath which contains a degreasing solution.
  • the aluminum substrate can therefore be at least partially, in particular completely, z. B. by immersion, are introduced into a corresponding degreasing bath.
  • the aluminum substrate placed in the degreasing bath in a corresponding manner can be agitated in the degreasing bath.
  • the aluminum substrate suitably placed in the degreasing bath may not be agitated in the degreasing bath.
  • a degreasing bath containing an alkaline degreasing solution can be used.
  • an alkaline degreasing solution is particularly suitable for the desired properties of the anodized aluminum articles to be produced.
  • An alkaline degreasing solution can be e.g. B. be a degreasing solution available under the trade name "Alficlean” which z. B. can be obtained from Alufinish GmbH & Co. KG, 56626 Andernach (DE).
  • Alficlean 150 Alufinish GmbH & Co. KG, 56626 Andernach
  • the degreasing solutions available under the trade names “Alficlean 150”, “Alficlean 154/4” or “Alficlean 155” come into consideration.
  • the degreasing step can be carried out for a period of between 1 and 60 minutes, in particular between 5 and 30 minutes.
  • the degreasing step can therefore be carried out for 1 min, for 2 min, for 3 min, for 4 min, for 5 min, for 6 min, for 7 min, for 8 min, for 9 min, for 10 min, for 11 min, for 12 min, for 13 min, for 14 min, for 15 min, for 16 min, for 17 min, for 18 min, for 19 min, for 20 min, for 21 min, for 22 min, for 23 min, for 24 min, for 25 min, for 26 min, for 27 min, for 28 min, for 29 min, for 30 min, for 31 min, for 32 min, for 33 min, for 34 min, for 35 min, for 36 min, for 37 min, for 38 min, for 39 min, for 40 min, for 41 min, for 42 min, for 43 min, for 44 min, for 45 min, for 46 min, for 47 min, for 48 min, for 49 min, for 50 min, for 51 min, for 52 min, for 53
  • the degreasing step can also be conceivable for the degreasing step to be carried out for a period of less than 1 minute or more than 60 minutes.
  • the concrete selection of the duration of the degreasing step results in particular from the chemical composition of the aluminum substrate provided and its surface condition before the degreasing step.
  • the term “surface texture” means in particular the presence of, e.g. B. to understand organic foreign substances or impurities on the surface of the aluminum substrate.
  • a pre-rinsing step of the degreased aluminum substrate can be performed in the first rinsing bath containing the first rinsing solution.
  • the pre-rinse step can be carried out by one or more at least partial, in particular complete immersion of the degreased aluminum substrate in the first rinsing bath.
  • the pre-rinsing step can therefore be kept comparatively short, which is beneficial to the efficiency of the process.
  • a pickling bath containing an alkaline pickling solution can be used.
  • the pH of the pickling solution is therefore typically, possibly significantly, above 7.
  • an alkaline pickling bath is particularly useful for the properties of the anodized aluminum article to be produced that are aimed for in accordance with the process.
  • the pickling step can generally be carried out as a matte pickling step.
  • a pickling step in variant E6 or E0 according to DIN 17611 is conceivable.
  • a pickling step in variant E6 according to DIN EN 17611 is carried out, since with this variant, depending on the treatment time and surface structure of the aluminum substrate, a very uniform matt to silky gloss finish can be achieved surface can be generated.
  • an alkaline pickling solution can be used in particular, which contains caustic soda, aluminum and at least one pickling additive.
  • an alkaline pickling solution can be used which contains caustic soda in a concentration of between 20 and 90 g/l, in particular between 30 and 80 g/l, more particularly between 40 and 70 g/l, more particularly between 50 and 60 g/l ; aluminum in a concentration of between 20 and 90 g/l, in particular between 30 and 80 g/l, more particularly between 40 and 70 g/l, more particularly between 50 and 60 g/l; and a pickling additive in a concentration between 1 and 20 g/l, in particular between 5 and 15 g/l.
  • An alkaline pickling solution used according to the process can therefore contain sodium hydroxide in one of the following concentrations: 20 g/l, 21 g/l, 22 g/l, 23 g/l, 24 g/l, 25 g/l, 26 g/l, 27g/l, 28g/l, 29g/l, 30g/l, 31g/l, 32g/l, 33g/l, 34g/l, 35g/l, 36g/l, 37 g/l, 38 g/l, 39 g/l, 40 g/l, 41 g/l, 42 g/l, 43 g/l, 44 g/l, 45 g/l, 46 g/l, 47 g/l, 48 g/l, 49 g/l, 50 g/l, 51 g/l, 52 g/l, 53 g/l, 54 g/l, 55 g/l, 56 g/l, 57 g/l, 58 g/l,
  • An alkaline pickling solution used according to the method can therefore contain aluminum, e.g. in the form of one or more aluminum salts, in one of the following concentrations: 20 g/l, 21 g/l, 22 g/l, 23 g/l, 24 g/l, 25 g/l, 26 g/l , 27 g/l, 28 g/l, 29 g/l, 30 g/l, 31 g/l, 32 g/l, 33 g/l, 34 g/l,
  • the aluminum can also be present in a concentration below 20 g/l or above 90 g/l.
  • An alkaline pickling solution used according to the method can therefore contain a pickling additive in one of the following concentrations: 1 g/l, 2 g/l, 3 g/l, 4 g/l, 5 g/l, 6 g/l, 7 g/l , 8g/l, 9g/l, 10g/l, 11g/l, 12g/l, 13g/l, 14g/l, 15g/l, 16g/l, 17g/l , 18g/l, 19g/l, 20g/l.
  • the pickling additive can also be present in a concentration below 1 g/l or above 20 g/l.
  • a pickling additive can be used which reduces or prevents foaming caused by the pickling process; and/or a pickling additive is used which influences the viscosity of the pickling solution, d. H. especially improved; and/or a pickling additive is used which influences the drag-out rate of the pickling solution, d. H. especially improved.
  • a corresponding pickling additive can be e.g. B. be a pickling additive available under the trade name "Alfisatin” which z. B. can be obtained from Alufinish GmbH & Co. KG, 56626 Andernach (DE).
  • the pickling additives available under the trade names “Alfisatin 338”, “Alfisatin 339/4”, “Alfisatin 357” or “Alfisatin 358/1” are particularly suitable.
  • the pickling step can be carried out for a period of between 1 and 60 minutes, in particular between 5 and 30 minutes.
  • the pickling step can therefore be carried out for 1 min, for 2 min, for 3 min, for 4 min, for 5 min, for 6 min, for 7 min, for 8 min, for 9 min, for 10 min, for 11 min, for 12 min, for 13 min, for 14 min, for 15 min, for 16 min, for 17 min, for 18 min, for 19 min, for 20 min, for 21 min, for 22 min, for 23 min, for 24 min, for 25 min, for 26 min, for 27 min, for 28 min, for 29 min, for 30 min, for 31 min, for 32 min, for 33 min, for 34 min, for 35 min, for 36 min, for 37 min, for 38 min, for 39 min, for 40 min, for 41 min, for 42 min, for 43 min, for 44 min, for 45 min, for 46 min, for 47 min, for 48 min, for 49 min, for 50 min, for 51 min, for 52 min, for 53 min, for 54
  • a first rinsing bath can be used which contains industrial or fresh water as the rinsing solution.
  • the first rinsing step can be carried out by immersing the pickled aluminum substrate, at least in sections, in particular completely, one or more times in the first rinsing bath, which contains the first rinsing solution.
  • the aluminum substrate can therefore be at least partially, in particular completely, z. B. by immersion, are introduced into the first rinsing bath.
  • the aluminum substrate placed in the first rinsing bath in a corresponding manner can be moved in the first rinsing bath.
  • the aluminum substrate placed in the first rinsing bath in a corresponding manner cannot be moved in the first rinsing bath.
  • a second rinsing bath can be used, which contains industrial or fresh water as the rinsing solution.
  • the second rinsing step can be carried out by immersing the pickled aluminum substrate, at least in sections, in particular completely, one or more times in the second rinsing bath, which contains the second rinsing solution.
  • the aluminum substrate can therefore be at least partially, in particular completely, z. B. by immersion, are introduced into the second rinsing bath.
  • the aluminum substrate placed in the second rinsing bath in a corresponding manner can be moved in the second rinsing bath.
  • the aluminum substrate suitably placed in the second rinsing bath may not be agitated in the second rinsing bath.
  • the first rinsing step and/or the second rinsing step can (in each case) be carried out for a period of between 1 and 90 seconds, in particular between 5 and 30 seconds.
  • the first rinsing step and/or the second rinsing step can therefore be for 1 sec, for 2 sec, for 3 sec, for 4 sec, for 5 sec, for 6 sec, for 7 sec, for 8 sec, for 9 sec, for 10 sec , for 11 sec, for 12 sec, for 13 sec, for 14 sec, for 15 sec, for 16 sec, for 17 sec, for 18 sec, for 19 sec, for 20 sec, for 21 sec, for 22 sec, for 23 sec, for 24 sec, for 25 sec, for 26 sec, for 27 sec, for 28 sec, for 29 sec, for 30 sec, for 31 sec, for 32 sec, for 33 sec, for 34 sec, for 35 sec , for 36 sec, for 37 sec, for 38 sec, for 39 sec, for 40 sec, for 41 sec, for 42 sec, for 43 sec, for 44 sec, for 45 sec, for
  • first rinsing step and/or the second rinsing step are also carried out for a period of less than 1 second or more than 90 seconds in exceptional cases.
  • a desmutting bath containing an acidic desmutting solution can be used.
  • the pH of the pickling solution is therefore typically, possibly significantly, below 7. Studies have shown that an acidic pickling bath is particularly useful for the properties of the anodized aluminum articles to be produced that are desired according to the process.
  • an acidic pickling solution can be used, which contains nitric acid, hydrochloric acid or sulfuric acid.
  • an acidic desmutting solution can be used according to the method, which contains nitric acid or hydrochloric acid or sulfuric acid in a concentration of between 50 and 400 g/l, in particular between 100 and 350 g/l, more particularly between 150 and 300 g/l, more particularly between 200 and 250 g/l.
  • An acidic desmutting solution used according to the method can therefore contain nitric acid or hydrochloric acid or sulfuric acid in one of the following concentrations: 51 g/l, 52 g/l, 53 g/l, 54 g/l, 55 g/l, 56 g/l, 57 g/l, 58 g/l, 59 g/l, 60 g/l, 61 g/l, 62 g/l, 63 g/l, 64 g/l, 65 g/l, 66 g/l, 67 g /L, 68g/L, 69g/L, 70g/L, 71g/L, 72g/L, 73g/L, 74g/L, 75g/L, 76g/L, 77g /l, 78 /l, 79g/l, 80g/l, 81g/l,
  • the pickling step can be carried out for a period of between 1 and 60 minutes, in particular between 5 and 30 minutes.
  • the pickling step can therefore be carried out for 1 min, for 2 min, for 3 min, for 4 min, for 5 min, for 6 min, for 7 min, for 8 min, for 9 min, for 10 min, for 11 min, for 12 min, for 13 min, for 14 min, for 15 min, for 16 min, for 17 min, for 18 min, for 19 min, for 20 min, for 21 min, for 22 min, for 23 min, for 24 min, for 25 min, for 26 min, for 27 min, for 28 min, for 29 min, for 30 min, for 31 min, for 32 min, for 33 min, for 34 min, for 35 min, for 36 min, for 37 min, for 38 min, for 39 min, for 40 min, for 41 min, for 42 min, for 43 min, for 44 min, for 45 min, for 46 min, for 47 min, for 48 min, for 49 min, for 50 min, for 51 min, for 52 min, for 53 min, for 54
  • the pickling step is also carried out for a period of less than 1 minute or more than 60 minutes in exceptional cases.
  • a third rinsing bath can be used, which contains industrial or fresh water as the rinsing solution.
  • the third rinsing step can be carried out by immersing the pickled aluminum substrate, at least in sections, in particular completely, one or more times in the third rinsing bath, which contains the third rinsing solution.
  • the aluminum substrate can therefore be at least partially, in particular completely, z. B. by immersion, are introduced into the third rinsing bath.
  • the aluminum substrate placed in the third rinsing bath in a corresponding manner can be moved in the third rinsing bath.
  • the aluminum substrate placed in the third rinsing bath in a corresponding manner may not be moved in the third rinsing bath.
  • a fourth rinsing bath can be used according to the method, which contains industrial or fresh water as the rinsing solution.
  • the fourth rinsing step can be carried out by immersing the pickled aluminum substrate, at least in sections, in particular completely, one or more times in the fourth rinsing bath, which contains the fourth rinsing solution.
  • the aluminum substrate can therefore be at least partially, in particular completely, z. B. by immersion, are introduced into the fourth rinsing bath.
  • the aluminum substrate placed in the fourth rinsing bath in a corresponding manner can be moved in the fourth rinsing bath.
  • the aluminum substrate placed in the fourth rinsing bath in a corresponding manner may not be moved in the fourth rinsing bath.
  • the third rinsing step and/or the fourth rinsing step can (in each case) be carried out for a period of between 1 and 90 seconds, in particular between 5 and 30 seconds.
  • the third rinsing step and/or the four rinsing steps can therefore be for 1 sec, for 2 sec, for 3 sec, for 4 sec, for 5 sec, for 6 sec, for 7 sec, for 8 sec, for 9 sec, for 10 sec , for 11 sec, for 12 sec, for 13 sec, for 14 sec, for 15 sec, for 16 sec, for 17 sec, for 18 sec, for 19 sec, for 20 sec, for 21 sec, for 22 sec, for 23 sec, for 24 sec, for 25 sec, for 26 sec, for 27 sec, for 28 sec, for 29 sec, for 30 sec, for 31 sec, for 32 sec, for 33 sec, for 34 sec, for 35 sec , for 36 sec, for 37 sec, for 38 sec, for 39 sec, for 40 sec, for 41 sec, for 42 sec, for 43 sec, for 44 sec, for 45 sec, for
  • the third rinsing step and/or the fourth rinsing step are also carried out for a period of less than 1 second or more than 90 seconds in exceptional cases.
  • at least one anodizing bath containing an acidic anodizing solution can be used.
  • the pH of the anodizing solution is therefore typically, possibly significantly, below 7. Studies have shown that an acidic anodizing bath is particularly useful for the properties of the anodized aluminum articles to be produced that are desired according to the process.
  • an acidic anodizing solution can be used, which aluminum, z. B. in the form of one or more aluminum salts, in particular aluminum sulfate, and sulfuric acid.
  • an acidic anodizing solution can be used which contains aluminum, e.g. B. in the form of one or more aluminum salts, such as. B. aluminum sulfate (AI 2 (S0) 3 or AI 2 (S0 4 ) 2 ), and contains sulfuric acid.
  • the concentration of the sulfuric acid can be between 100 and 350 g/l, in particular the concentration of the sulfuric acid can be between 140 and 200 g/l, more particularly between 150 and 190 g/l.
  • the aluminum or the aluminum salt can be present in a concentration between 10 and 80 g/l, in particular between 10 and 50 g/l, more particularly between 10 and 45 g/l, more particularly between 10 and 40 g/l, more particularly between 10 and 35 g/l, more particularly between 10 and 30 g/l.
  • An acidic anodizing solution used according to the method can therefore contain sulfuric acid in one of the following concentrations: 51 g/l, 52 g/l, 53 g/l, 54 g/l, 55 g/l, 56 g/l, 57 g/l, 58 g/l, 59 g/l, 60 g/l, 61 g/l, 62 g/l, 63 g/l, 64 /l, 65 g/l, 66 g/l, 67 g/l, 68 g/l, 69 g/l, 70 g/l, 71 g/l, 72 g/l, 73 g/l, 74 g/l, 75 g/l, 76 g/l, 77 g/l, 78 /I, 79g/l, 80g/l, 81g/l, 82g/l, 83g/l, 84g/l, 85g/l, 86g/l
  • An acidic anodizing solution used according to the method can therefore contain aluminum, e.g. B. in the form of one or more aluminum salts, ie in particular aluminum sulfate (AI 2 (S0 4 ) 3 or AI 2 (S0 4 ) 2 ), in one of the following concentrations: 20 g / l, 21 g / l, 22 g / l, 23 g/l, 24 g/l, 25 g/l, 26 g/l, 27 g/l, 28 g/l, 29 g/l, 30 g/l, 31 g/l, 32 g/l l, 33g/l, 34g/l, 35g/l, 36g/l, 37g/l, 38g/l,
  • aluminum salts ie in particular aluminum sulfate (AI 2 (S0 4 ) 3 or AI 2 (S0 4 ) 2
  • concentrations 20 g / l, 21 g / l, 22 g /
  • the aluminum can also be present in a concentration below 20 g/l or above 90 g/l in exceptional cases.
  • the anodizing step can be carried out for a period of between 1 and 60 minutes, in particular between 5 and 30 minutes.
  • the anodizing step can therefore be carried out for 1 min, for 2 min, for 3 min, for 4 min, for 5 min, for 6 min, for 7 min, for 8 min, for 9 min, for 10 min, for 11 min, for 12 min, for 13 min, for 14 min, for 15 min, for 16 min, for 17 min, for 18 min, for 19 min, for 20 min, for 21 min, for 22 min, for 23 min, for 24 min, for 25 min, for 26 min, for 27 min, for 28 min, for 29 min, for 30 min, for 31 min, for 32 min, for 33 min, for 34 min, for 35 min, for 36 min, for 37 min, for 38 min, for 39 min, for 40 min, for 41 min, for 42 min, for 43 min, for 44 min, for 45 min, for 46 min, for 47 min, for 48 min, for 49 min, for 50 min, for 51 min, for 52 min, for 53
  • anodizing step is also carried out for a period of less than 1 minute or more than 60 minutes in exceptional cases.
  • the anodizing step can contain several, ie in particular at least two, more particularly three or more, separate anodizing sub-steps. Consequently, the partial anodizing step can also be carried out according to the method in several separate anodizing baths, each containing an anodizing solution.
  • the above statements in connection with the chemical composition of the respective anodizing baths, ie in particular the concentrations of the respective components of the respective anodizing baths, and the durations apply analogously to each partial anodizing step.
  • the at least one rinsing step following the at least one anodizing step can be carried out in at least one further rinsing bath, which contains process or fresh water as the rinsing solution.
  • the at least one further rinsing step can be carried out by immersing the anodised aluminum article at least in sections, in particular completely, one or more times in the at least one rinsing bath which contains the at least one further rinsing solution.
  • the anodized aluminum article can therefore be at least partially, in particular completely, z. B. by immersion, in which at least one further rinsing bath can be introduced.
  • the anodized aluminum article placed in the at least one further rinsing bath in a corresponding manner can be moved in the at least one further rinsing bath.
  • the anodized aluminum article introduced in a corresponding manner into the at least one further rinsing bath cannot be moved in the at least one further rinsing bath.
  • the at least one further rinsing step can be carried out for a period of between 1 and 90 seconds, in particular between 5 and 30 seconds.
  • the at least one further rinsing step can therefore last for 1 second, for 2 seconds, for 3 seconds, for 4 seconds, for 5 seconds, for 6 seconds, for 7 seconds, for 8 seconds, for 9 seconds, for 10 seconds, for 11 seconds , for 12 sec, for 13 sec, for 14 sec, for 15 sec, for 16 sec, for 17 sec, for 18 sec, for 19 sec, for 20 sec, for 21 sec, for 22 sec, for 23 sec, for 24 sec, for 25 sec, for 26 sec, for 27 sec, for 28 sec, for 29 sec, for 30 sec, for 31 sec, for 32 sec, for 33 sec, for 34 sec, for 35 sec, for 36 sec , for 37 sec, for 38 sec, for 39 sec, for 40 sec, for 41 sec, for 42 sec, for 43 sec, for 44 sec, for 45 sec, for 46 sec, for 47 sec, for 48 sec, for 49 sec, for 50 sec, for 51
  • a first rinse can z. B. industrial or fresh water, especially industrial water, contained as a rinsing solution.
  • a second rinsing bath can also contain industrial or fresh water, in particular fresh water, as the rinsing solution.
  • a third rinsing bath can contain circuit water, in particular circuit water with a conductivity below 50 pS/cm, in particular below 30 pS/cm, as the rinsing solution.
  • the anodized aluminum article can have an aluminum oxide or anodized layer with a layer thickness in a range between 5 and 50 ⁇ m, in particular between 10 and 30 mih.
  • the layer thickness of the aluminum oxide or anodized layer is at least 15 ⁇ m. This may require the anodizing step to be carried out over a period of at least 15 minutes, in particular at least 20 minutes, more particularly at least 25 minutes.
  • the anodized aluminum article is a semi-finished product, it can be subjected to at least one post-processing step in order to produce a finished product from the semi-finished product.
  • At least one compression step can be carried out, in which the anodized aluminum article, i. H. in particular the aluminum oxide layer formed by the anodizing step, is compacted in order to reduce any porosity present in the aluminum oxide layer.
  • At least one post-processing step can be carried out, in which the anodised aluminum article is provided with, for example, alphanumeric symbols, coded or non-coded information, e.g. B. in the form of barcodes, QR codes, etc., is printed, and / or at least one post-processing step takes place, in which from the anodized aluminum article anodized aluminum body defined shape, z. B. be separated by punching or cutting.
  • an aluminum substrate made of pure aluminum or an aluminum alloy can be provided and can therefore be used as the starting material.
  • the method can thus be carried out with aluminum substrates made of pure aluminum or an aluminum alloy.
  • an aluminum substrate made of an aluminum alloy is used, an aluminum alloy is particularly suitable which, in addition to aluminum, contains at least one alloy component from the group: iron, silicon, copper, manganese, magnesium, chromium, tin or titanium.
  • an aluminum alloy can be used which has the following chemical composition by mass: 0.70-1.0% by weight iron, 0.30-0.50% by weight silicon, 0.20-0.50% by weight % copper, 0.20 - 0.50 wt% manganese, 0.50 - 1.10 wt% magnesium, 0.10 - 0.50 wt% chromium, 0.25 - 0.60 wt% % tin and 0-0.30% by weight titanium.
  • the remainder is made up of aluminum and any impurities; of course, all mass fractions add up to 100% by weight.
  • the degreasing step can be carried out at a temperature in a range between 20 and 80°C, in particular in a range between 25 and 75°C, further in particular in a range between 30 and 70°C, further in particular in a range between 35°C and 65 °C, further in particular between 40°C and 60°, further in particular in a range between 45°C and 55°C. Consequently, the temperature of the degreasing bath can be in a range between 20 and 80°C, in particular between 25 and 75°C, further in particular between 30 and 70°C, further in particular between 35°C and 65°C, further in particular between 40°C and 60°, further between 45°C and 55°C.
  • the pickling step can be carried out at a temperature in a range between 30 and 90°C, in particular in a range between 35 and 85°C, further in particular in a range between 40 and 80°C, further in particular in a range between 45°C and 75 °C, further in particular between 50°C and 70°, further in particular in a range between 55°C and 65°C.
  • the temperature of the pickling bath can therefore be between 30 and 90°C, in particular in a range between 35 and 85°C, more particularly in a range between 40 and 80°C, more particularly in a range between 45°C and 75 °C, further in particular between 50°C and 70°, further in particular in a range between 55°C and 65°C.
  • the pickling step can be carried out at a temperature in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the temperature of the pickling bath can be in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the anodizing step can be carried out at a temperature in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the temperature of the anodizing bath can be in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • an upper limit temperature of the anodizing bath at 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25° C, 26°C, 27°C, 28°C, 29°C or 30°C.
  • a lower limit temperature of the anodizing bath can be, in particular, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15° C, 16°C, 17°C, 18°C, 19°C or 20°C.
  • the aforementioned temperatures or temperature ranges can refer to all anodizing baths.
  • a second aspect of the invention relates to an anodized aluminum article made by the method of the first aspect of the invention. All statements in connection with the method according to the first aspect of the invention apply analogously to the anodized aluminum article according to the second aspect of the invention and vice versa.
  • a third aspect of the invention relates to a plant for carrying out the method according to the method according to the first aspect of the invention.
  • the system includes the facilities described in connection with the method.
  • the system can also include a corresponding control device, which is set up to generate control information for controlling the operation of respective devices and connected to the respective devices, i. H. in particular the control devices assigned to the respective devices. All statements in connection with the method according to the first aspect of the invention apply analogously to the system according to the third aspect of the invention and vice versa.
  • FIG. 1 is a flow chart illustrating a method for manufacturing an anodized aluminum article according to an embodiment
  • FIG. 2 shows a basic illustration of an anodized aluminum article produced according to the method according to an exemplary embodiment in a sectional view.
  • FIG. 1 shows a flowchart to illustrate a method for producing an anodized aluminum article 1 according to an embodiment.
  • the method or the individual method steps are used to produce at least one anodized aluminum article 1, ie an aluminum article such.
  • B. a technical component, the surface of which is formed at least in sections, optionally completely, by an aluminum oxide layer formed as part of an electrochemical anodizing process or has such a layer.
  • An anodized aluminum article 1 that can be produced or produced according to the method can be a semi-finished product (semi-finished product) or a finished product (complete product); as a semi-finished product, the anodized aluminum article 1 can be subjected to one or more post-processing steps in order to transform the semi-finished product into a finished product.
  • the method is a special sequence or sequence of method or process steps, in particular with associated Process parameters includes, which, in contrast to known anodizing processes, surprisingly makes it possible to efficiently reproducibly produce anodized aluminum articles 1 with special properties, ie in particular with particularly matt or non-reflective surfaces.
  • a first method step S1 sees a pickling step or pickling process of a provided aluminum substrate 1.1 in a pickling bath, which contains a pickling solution, d. H. in particular an aqueous pickling solution contains before.
  • a continuously or discontinuously provided, z. B. band-like or -shaped aluminum substrate 1.1 is subjected to a pickling step or pickling process in a pickling bath containing a pickling solution.
  • the result of carrying out the first method step is a pickled aluminum substrate 1.1.
  • the pickling serves to prepare the aluminum substrate 1.1 for the subsequent anodizing step or anodizing process.
  • the first method step S1 can be carried out in a pickling device which includes a pickling bath containing a corresponding pickling solution.
  • a pickling bath containing an alkaline pickling solution can be used.
  • the pH of the pickling solution is therefore typically, possibly significantly, above 7.
  • an alkaline pickling bath is particularly useful for the properties of the anodized aluminum article to be produced that are aimed for in accordance with the process.
  • the pickling step can generally be carried out as a matte pickling step.
  • a pickling step in variant E6 or E0 according to DIN 17611 is conceivable.
  • a pickling step in variant E6 according to DIN EN 17611 is carried out, since with this variant, depending on the treatment time and surface structure of the aluminum substrate, a very uniform matt to silky gloss finish can be achieved surface can be generated.
  • an alkaline pickling solution which contains caustic soda in a concentration between 55 and 60 g/l; aluminum in a concentration between 50 and 55 g/l; and a pickling additive in a concentration between 10 and 15 g/l.
  • a pickling additive can be used which reduces or prevents foaming caused by the pickling process; and/or a pickling additive is used which influences the viscosity of the pickling solution, d. H. especially improved; and/or a pickling additive is used which influences the drag-out rate of the pickling solution, d. H. especially improved.
  • a corresponding pickling additive can be e.g. B. be a pickling additive available under the trade name "Alfisatin” which z. B. can be obtained from Alufinish GmbH & Co. KG, 56626 Andernach (DE).
  • the pickling additives available under the trade names “Alfisatin 338”, “Alfisatin 339/4”, “Alfisatin 357” or “Alfisatin 358/1” are particularly suitable.
  • the pickling step can be carried out for a period of between 1 and 60 minutes, in particular between 1 and 30 minutes.
  • first method step S1 several aluminum substrates 1.1 can be provided and correspondingly subjected to a pickling step or pickling process.
  • the method is described below in connection with an aluminum substrate 1.1, the same naturally applies to a number of aluminum substrates 1.1. Consequently, several aluminum substrates 1.1 can be treated or processed in each step of the method, in particular simultaneously.
  • a second process step S1 sees a first rinsing step of the pickled aluminum substrate in a first rinsing bath containing a first rinsing solution, i. H. e.g. B. domestic water contains before.
  • the pickled aluminum substrate is then subjected to a first rinsing step or rinsing process in a first rinsing bath containing a first rinsing solution.
  • the result of carrying out the second method step S2 is a rinsed aluminum substrate; After the first rinsing step or rinsing process, the aluminum substrate is largely free of the pickling solution, which would have a negative effect on the subsequent method or process steps.
  • the pickled aluminum substrate can be immersed in the first rinse bath and rinsed in the first rinse bath for a period of between 25 and 35 seconds.
  • the second method step S2 can be carried out in a first rinsing device which comprises a first rinsing bath containing a corresponding first rinsing solution.
  • a third process step S3 sees a second rinsing step of the pickled aluminum substrate rinsed in the first rinsing bath in a second rinsing bath containing a second rinsing solution, i. H. e.g. B. domestic water contains before.
  • the third method step S3 which typically immediately follows the second method step S2
  • the aluminum substrate 1.1 that has been pickled and rinsed in the first rinsing bath is then subjected to a second rinsing step or rinsing process in a second rinsing bath containing a second rinsing solution.
  • the result of carrying out the third method step S3 is a particularly thoroughly rinsed aluminum substrate 1.1; After the third rinsing step or rinsing process, the aluminum substrate 1.1 is typically (almost) completely free of the pickling solution, which, as mentioned, would have a negative effect on the subsequent method or process steps.
  • the pickled aluminum substrate 1.1 can be immersed in the second rinsing bath and rinsed in the second rinsing bath for a period of between 25 and 35 seconds.
  • the third method step S3 can be carried out in a second rinsing device which comprises a second rinsing bath containing a corresponding second rinsing solution.
  • a fourth method step S4 provides for a pickling step of the aluminum substrate 1.1 rinsed in the second rinsing bath in a pickling bath which contains a pickling solution, ie in particular an aqueous pickling solution.
  • the pickled and in the aluminum substrate 1.1 rinsed in the first and second rinsing bath is then subjected to a pickling step or pickling process in a pickling bath containing a pickling solution.
  • the result of carrying out the fourth method step S4 is a pickled aluminum substrate 1.1.
  • Pickling serves to prepare the aluminum substrate 1.1 for the subsequent anodizing step or anodizing process.
  • the fourth method step can be carried out in a desmutting device which comprises a desmutting bath containing a suitable desmutting solution.
  • a desmutting bath containing an acidic desmutting solution can be used.
  • the pH of the pickling solution is therefore typically, possibly significantly, below 7. Studies have shown that an acidic pickling bath is particularly useful for the properties of the anodized aluminum article 1 to be produced that are desired according to the process.
  • an acidic pickling solution can be used, which contains nitric acid or hydrochloric acid or sulfuric acid in a concentration between 200 and 250 g / l.
  • the pickling step can be carried out for a period of between 5 and 30 minutes.
  • a fifth process step S5 sees a third rinsing step of the pickled aluminum substrate in a third rinsing bath containing a third rinsing solution, i. H. e.g. B. domestic water contains before.
  • a third rinsing solution i. H. e.g. B. domestic water contains before.
  • the pickled aluminum substrate 1.1 is then subjected to a third rinsing step or rinsing process in a third rinsing bath containing a third rinsing solution.
  • the result of carrying out the fifth method step S5 is a rinsed pickled aluminum substrate 1.1; After the third rinsing step or rinsing process, the aluminum substrate 1.1 is largely freed from the pickling solution, which would have a negative effect on the subsequent method or process steps.
  • the pickled aluminum substrate 1.1 can be immersed in the third rinsing bath and rinsed in the third rinsing bath for a period of between 25 and 35 seconds.
  • a third rinsing device which comprises a third rinsing bath containing a corresponding third rinsing solution.
  • a sixth method step S6 provides for a fourth rinsing step of the pickled aluminum substrate 1.1 rinsed in the third rinsing bath in a fourth rinsing bath which contains a fourth rinsing solution, ie for example process water.
  • the aluminum substrate which has been stripped and rinsed in the third rinsing bath is then subjected to a fourth rinsing step or rinsing process in a fourth rinsing bath containing a fourth rinsing solution.
  • the result of carrying out the sixth method step is a particularly thoroughly rinsed aluminum substrate 1.1; the aluminum substrate 1.1 is after the fourth rinsing step or The rinsing process is typically (almost) completely free of the pickling solution, which, as mentioned, would have a negative effect on the subsequent process steps.
  • the aluminum substrate 1.1 can be immersed in the fourth rinsing bath and rinsed in the fourth rinsing bath for a period of between 25 and 35 seconds.
  • the sixth method step S6 can be carried out in a fourth rinsing device which includes a fourth rinsing bath containing a corresponding fourth rinsing solution.
  • a seventh method step S7 now sees at least one anodizing step in at least one anodizing bath, which contains an anodizing solution, i. H. in particular an aqueous anodizing solution, contains, as a result of which an anodized aluminum article 1 is formed from the aluminum substrate 1.1.
  • the seventh method step S7 typically directly following the sixth method step S6, the aluminum substrate 1.1, which has been stripped and rinsed in the third and fourth rinsing bath, is then subjected to an anodizing step or anodizing process in an anodizing bath containing an anodizing solution.
  • the result of carrying out the seventh method step S7 is an anodized aluminum article 1 with a particularly matt and non-reflective surface.
  • the seventh method step S7 can be carried out in an anodizing device which includes an anodizing bath containing a corresponding anodizing solution.
  • the aluminum substrate 1.1 acts as an anode and an anodizing solution, e.g. B. trough-like or -shaped, container is connected as a cathode, whereby when appropriate electrical voltages are applied to the aluminum substrate 1.1 forming the anode and the container forming the cathode, oxygen is generated on the surface of the aluminum substrate 1.1, which oxygen on the surface of the aluminum substrate 1.1 with Aluminum ions react to form aluminum oxide and thus form an aluminum oxide layer 1.2 (cf. FIG. 2) on the surface of the aluminum substrate 1.1 or convert the surface of the aluminum substrate 1.1 into an aluminum oxide layer 1.2.
  • the anodizing step or process therefore includes electrochemical processes for forming a corresponding aluminum oxide layer 1.2.
  • At least one anodizing bath containing an acidic anodizing solution can be used.
  • the pH of the anodizing solution is therefore typically, possibly significantly, below 7.
  • an acidic anodizing bath is particularly useful for the properties of the anodized aluminum articles to be produced that are desired according to the process.
  • an acidic anodizing solution can be used, which aluminum, z. B. in the form of one or more aluminum salts, such as. B. aluminum sulfate (AI 2 (S0 4 ) 3 or AI 2 (S0 4 ) 2 ) and sulfuric acid.
  • the concentration of the sulfuric acid can be between 100 and 350 g/l, in particular the concentration of the sulfuric acid can be between 140 and 200 g/l, more particularly between 150 and 190 g/l.
  • the aluminum or the aluminum salt can be present in a concentration of between 10 and 80 g/l, in particular between 10 and 50 g/l, more particularly between 10 and 45 g/l, more particularly between 10 and 40 g/l, more particularly between 10 and 35 g/l, more particularly between 10 and 30 g/l.
  • the anodizing step can be carried out for a period between 5 and 30 minutes.
  • the seventh method step S7 can have several, i. H. in particular three anodizing processes (anodic sub-steps) carried out one after the other in several anodizing baths, each of which contains a corresponding anodizing solution.
  • the respective anodizing processes can each be carried out for a period of between 5 and 30 minutes.
  • An eighth method step S8 sees at least one further rinsing step in at least one further rinsing bath, which contains a further rinsing solution, i. H. in particular a further aqueous rinsing solution.
  • the eighth method step S8 which typically immediately follows the seventh method step S7, the anodized aluminum article 1 is then subjected to at least one additional rinsing step or rinsing process in at least one additional rinsing bath containing an additional rinsing solution.
  • the result of carrying out the eighth method step S8 is a rinsed anodised aluminum article 1; the anodized aluminum article 1 is typically (almost) completely free of the anodizing solution after the at least one further rinsing step or rinsing process.
  • the aluminum article 1 can be immersed in the at least one additional rinsing bath and rinsed in the at least one additional rinsing bath for a period of between 25 and 35 seconds.
  • the eighth method step S8 can be carried out in at least one additional rinsing device, which contains a further rinse bath included.
  • rinsing steps can be carried out in several, d. H. to be carried out in particular in three separate rinsing baths, each of which contains a rinsing solution.
  • a first rinse can z. B. process water contained as a rinsing solution.
  • a second rinsing bath can e.g. B. Fresh water included as a rinsing solution.
  • a third rinsing bath can contain circuit water, in particular circuit water with a conductivity below 50 pS/cm, in particular below 30 pS/cm, as the rinsing solution.
  • the aluminum substrate was rinsed several times in separate rinsing baths or rinsing solutions before the actual anodizing step or process, so that substances that may be harmful to the anodizing step or process or the associated anodizing result were removed from the aluminum substrate 1.1. It is also noteworthy that the aluminum substrate 1.1 was anodized in several anodizing baths, which results in special surface properties of the aluminum article 2 to be produced or produced.
  • the sequence of process steps described enables an efficient, reproducible production of anodised aluminum articles with special properties, ie in particular with particularly matt or non-reflective surfaces.
  • the anodized aluminum article produced according to the method thus has a matt, non-reflective surface.
  • All method steps can be carried out at least partially, optionally completely, in an automated manner or in an automated manner.
  • a system set up for carrying out the method can have facilities, d. H. in particular pickling devices, rinsing devices, pickling devices and anodizing devices, which enable the process step to be carried out at least partially, optionally completely, in an automated or automated manner.
  • the operation of respective devices can be controlled via a hardware and/or software-implemented control device, which is set up to generate control information for controlling the operation of respective devices and is connected to the respective devices, i. H. in particular the control devices assigned to the respective devices.
  • the anodized aluminum article 1 can have an aluminum oxide or anodized layer 1.2 with a layer thickness in a range between 5 and 50 ⁇ m, in particular between 10 and 30 ⁇ m.
  • the layer thickness of the aluminum oxide or anodized layer is at least 15 ⁇ m. This may require the anodizing step to be carried out over a period of at least 15 minutes, in particular at least 20 minutes, more particularly at least 25 minutes.
  • the anodized aluminum article 1 should it be a semi-finished product, can be subjected to at least one post-processing step in order to produce a finished product from the semi-finished product.
  • At least one compression step can be carried out , in which the anodized aluminum article 1, i. H. in particular the aluminum oxide layer 1.2 formed by the anodizing step, is compacted in order to reduce any porosity present in the aluminum oxide layer 1.2.
  • At least one post-processing step can be carried out, in which the anodised aluminum article 1 is provided with, for example, alphanumeric symbols, coded or non-coded information, e.g. B. in the form of barcodes, QR codes, etc., is printed, and / or at least one post-processing step takes place, in which from the anodized aluminum article 1 anodized aluminum body defined shape, z. B.
  • the method can be carried out with aluminum substrates 1.1 made of pure aluminum or an aluminum alloy. If an aluminum substrate 1.1 made of an aluminum alloy is used, an aluminum alloy is particularly suitable which, in addition to aluminum, contains at least one alloy component from the group: iron, silicon, copper, manganese, magnesium, chromium, tin or titanium. In particular, an aluminum alloy can be used which has the following chemical composition by mass: 0.70-1.0% by weight iron, 0.30-0.50% by weight silicon, 0.20-0.50% by weight % copper, 0.20-0.50% by weight manganese, 0.50-1.10% by weight magnesium, 0.10-0.50% by weight chromium, 0.25-0.60% by weight % tin and 0-0.30% by weight titanium. The remainder is made up of aluminum and any impurities; of course, all mass fractions add up to 100% by weight.
  • a degreasing step of the provided aluminum substrate 1.1 can be carried out to degrease the aluminum substrate 1.1.
  • the degreasing of the aluminum substrate 1.1 typically leads to a better pickling result, as organic substances can be at least partially, optionally completely, removed from the aluminum substrate 1.1.
  • the degreasing step can be carried out by immersing the aluminum substrate 1.1, at least in sections, in particular completely, one or more times in a degreasing bath which contains a degreasing solution.
  • a degreasing bath containing an alkaline degreasing solution can be used.
  • an alkaline degreasing solution is particularly suitable for the desired properties of the anodized aluminum article 1 to be produced.
  • An alkaline degreasing solution can be e.g. B. be a degreasing solution available under the trade name "Alficlean” which z. B. can be obtained from Alufinish GmbH & Co. KG, 56626 Andernach (DE).
  • Alficlean 150 Alufinish GmbH & Co. KG, 56626 Andernach
  • the degreasing solutions available under the trade names “Alficlean 150”, “Alficlean 154/4” or “Alficlean 155” come into consideration.
  • a pre-rinsing step of the degreased aluminum substrate 1.1 can be carried out in the first rinsing bath containing the first rinsing solution.
  • the pre-rinsing step can be carried out by immersing the degreased aluminum substrate 1.1 in the first rinsing bath, at least in sections, in particular completely, one or more times.
  • the pre-rinsing step can therefore be kept comparatively short, which is beneficial to the efficiency of the process.
  • the degreasing step can be carried out at a temperature in a range between 20 and 80°C, in particular in a range between 25 and 75°C, further in particular in a range between 30 and 70°C, further in particular in a range between 35°C and 65 °C, further in particular between 40°C and 60°, further in particular in a range between 45°C and 55°C. Consequently, the temperature of the degreasing bath can be in a range between 20 and 80°C, in particular between 25 and 75°C, further in particular between 30 and 70°C, further in particular between 35°C and 65°C, further in particular between 40°C and 60°, further between 45°C and 55°C.
  • the pickling step can be carried out at a temperature in a range between 30 and 90°C, in particular in a range between 35 and 85°C, further in particular in a range between 40 and 80°C, further in particular in a range between 45°C and 75 °C, further in particular between 50°C and 70°, further in particular in a range between 55°C and 65°C.
  • the temperature of the pickling bath can therefore be between 30 and 90°C, in particular in a range between 35 and 85°C, more particularly in a range between 40 and 80°C, more particularly in a range between 45°C and 75 °C, further in particular between 50°C and 70°, further in particular in a range between 55°C and 65°C.
  • the pickling step can be carried out at a temperature in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the temperature of the pickling bath can be in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the anodizing step can be carried out at a temperature in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35 °C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • the temperature of the anodizing bath can be in a range between 0 and 50°C, in particular in a range between 5 and 45°C, further in particular in a range between 10 and 40°C, further in particular in a range between 15°C and 35°C, further in particular between 15°C and 30°C, further in particular between 15°C and 25°C, further in particular between 15°C and 20°C.
  • an upper limit temperature of the anodizing bath at 15°C, 16°C, 17°C, 18°C, 19°C, 20°C, 21°C, 22°C, 23°C, 24°C, 25° C, 26°C, 27°C, 28°C, 29°C or 30°C.
  • a lower limit temperature of the anodizing bath can be, in particular, 5°C, 6°C, 7°C, 8°C, 9°C, 10°C, 11°C, 12°C, 13°C, 14°C, 15° C, 16°C, 17°C, 18°C, 19°C or 20°C. If several anodizing baths are used, the aforementioned temperatures or temperature ranges can refer to all anodizing baths.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un article en aluminium anodisé (1).
EP22747289.1A 2021-07-27 2022-07-05 Procédé de production d'un article en aluminium anodisé Pending EP4377500A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021119472.5A DE102021119472A1 (de) 2021-07-27 2021-07-27 Verfahren zur Herstellung eines eloxierten Aluminiumartikels
PCT/EP2022/068519 WO2023006351A1 (fr) 2021-07-27 2022-07-05 Procédé de production d'un article en aluminium anodisé

Publications (1)

Publication Number Publication Date
EP4377500A1 true EP4377500A1 (fr) 2024-06-05

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Application Number Title Priority Date Filing Date
EP22747289.1A Pending EP4377500A1 (fr) 2021-07-27 2022-07-05 Procédé de production d'un article en aluminium anodisé

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US (1) US20240271309A1 (fr)
EP (1) EP4377500A1 (fr)
DE (1) DE102021119472A1 (fr)
WO (1) WO2023006351A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5830960B2 (ja) 1980-02-27 1983-07-02 シチズン時計株式会社 着色アルミニウム多面体
US5091046A (en) * 1990-12-31 1992-02-25 Hunter Robert F Caustic etching of aluminum with matte finish and low waste capability
US6258463B1 (en) * 2000-03-02 2001-07-10 Praxair S.T. Technology, Inc. Anodized cryogenically treated aluminum
DE102004004140A1 (de) * 2004-01-28 2005-08-18 Henkel Kgaa Beizverfahren und Beizprodukt für Aluminium
PL221188B1 (pl) * 2012-08-23 2016-03-31 Sujecki Marcin Anodal Anodowanie I Barwienie Aluminium Spółka Cywilna Sposób uszlachetniania powierzchni wyciskanych wyrobów aluminiowych
CN108350598B (zh) 2015-10-30 2021-03-30 苹果公司 具有增强特征的阳极膜

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DE102021119472A1 (de) 2023-02-02
US20240271309A1 (en) 2024-08-15

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