EP2489448B1 - Traitement de surface en ligne pour obtenir des extrusions d'aluminium revêtues avec une couche résistante à la corrosion - Google Patents

Traitement de surface en ligne pour obtenir des extrusions d'aluminium revêtues avec une couche résistante à la corrosion Download PDF

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Publication number
EP2489448B1
EP2489448B1 EP20110001244 EP11001244A EP2489448B1 EP 2489448 B1 EP2489448 B1 EP 2489448B1 EP 20110001244 EP20110001244 EP 20110001244 EP 11001244 A EP11001244 A EP 11001244A EP 2489448 B1 EP2489448 B1 EP 2489448B1
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Prior art keywords
profile
solution
process according
corrosion
coating
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German (de)
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EP2489448A1 (fr
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Elodie Gazanion
Andreas Afseth
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Constellium Extrusions Deutschland GmbH
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Constellium Extrusions Deutschland GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/002—Extruding materials of special alloys so far as the composition of the alloy requires or permits special extruding methods of sequences
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C23/00—Extruding metal; Impact extrusion
    • B21C23/01—Extruding metal; Impact extrusion starting from material of particular form or shape, e.g. mechanically pre-treated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02—Removing or drawing-off work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C35/00—Removing work or waste from extruding presses; Drawing-off extruded work; Cleaning dies, ducts, containers, or mandrels
    • B21C35/02—Removing or drawing-off work
    • B21C35/023—Work treatment directly following extrusion, e.g. further deformation or surface treatment
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/122—Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1229—Composition of the substrate
    • C23C18/1241—Metallic substrates
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1254—Sol or sol-gel processing
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1262—Process of deposition of the inorganic material involving particles, e.g. carbon nanotubes [CNT], flakes
    • C23C18/127—Preformed particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment

Definitions

  • extruded aluminium alloy profiles When they are not coated with a protective layer, extruded aluminium alloy profiles can develop cosmetic corrosion such as staining or discoloration, sometimes within a few days or weeks of natural exposure. As a result, they become unsightly and therefore unsuitable for the application for which they were intended.
  • the anodising process is generally carried out on the profiles after their ageing treatment. This process is preceded by degreasing and etching steps and followed by a sealing step.
  • the protective anodised layer is deposited when the profile is set to an anodic potential in an electrolytic bath, many handlings are required to obtain a good electrical contact ensuring the formation of a regular and homogeneous anodisation layer on the entire profile. Such handlings are very difficult to automate because of the geometric variety of profiles to be treated.
  • the electrical contact areas are not covered and must be then removed, thereby increasing the profile scrap ratio. As a result, it is a long and expensive batch process.
  • the applicant has investigated alternative surface treatment processes which improve the corrosion resistance of the profiles compared to non-treated products and which nevertheless are less expensive than known solutions such as anodising.
  • a purpose of the present invention is providing a process for manufacturing aluminium alloy extruded profile parts which are resistant to corrosion, comprising the step defined in claim 1.
  • the depositing device works in coordination with the puller in such a manner that there is no coating accumulation when the extrusion press is stopped for removing the container and shearing the butt.
  • the coating obtained is more or less regular and homogeneous. Therefore, the present coating process step is especially recommended for profiles, which should be corrosion resistant, but with undemanding requirements related this corrosion resistance. For example, the present coating process is recommended for profiles, which should be resistant to the cosmetic corrosion which results from their contact with the air and humidity.
  • aluminium alloy extrusions should be cooled or quenched at the exit of the extrusion press to a specific temperature range to ensure adequate mechanical properties after the ageing treatment.
  • the temperature of the profile should be less than a critical value, typically the autoignition temperature of the flammable material and it is therefore essential to deposit the fluid solution after the profile has been quenched to a temperature less than this critical value.
  • the temperature targeted after quench is between 80 °C and 250 °C, preferably between 140 °C and 210 °C, more preferably between 150 °C and 200°C.
  • the manufacturing process according to the invention is largely time-saving compared to processes of prior art.
  • the coating obtained by using this process provides significant improvement in corrosion properties in comparison with uncoated profiles. It is significantly less expensive than conventional coating processes due to less handling and treatment process steps.
  • the fluid solution to be applied on the profile at its exit from the extrusion press is a sol-gel precursor.
  • the corrosion resistant layer is a coating obtained by spraying the sol-gel precursor on the freshly formed metal surface of the profile.
  • sol-gel precursor it is to be understood that a coating is produced by the sol-gel technology, which, from application of a liquid solution of organo-metallic precursor chemicals on a substratum (here the profile), forms after curing a hardened protective layer fixed on the said substratum.
  • the protective layer is preferably a transparent curable sol-gel coating, through which the colour tone of the metallic substrate can be detected.
  • the protective layer applied on the fresh surface of the substrate is preferably a sol-gel coating made of a polysiloxane and advantageously a sol-gel coating made of a polysiloxane prepared from an alcoholic silane solution, especially an alkoxysilane solution, and an aqueous colloidal silica solution.
  • Polysiloxane is the term for polymers of crosslinked siloxanes. The polysiloxane is generated in particular by an acid catalyzed condensation reaction between hydrolyzed silanes, also known as silanols.
  • the condensation reaction between hydrolyzed silanes, especially alkoxysilanes, and colloidal silica results in the formation of an inorganic network of polysiloxanes.
  • organic groups may be built in the inorganic network with carbon bonds.
  • the organic groups for example alkyl groups, such as methyl, ethyl, propyl or butyl, do not participate directly to the polymerization or crosslinking of the siloxanes. They do not serve to form an organic polymer system but only to achieve the functionalization of the said siloxanes.
  • functional properties such as surface energy, hydrophobicity, oleophobicity of flexibility of the final cured coating, may be modified by an appropriate choice of organo-functional silanes.
  • X is also an alkyl, preferably from the group comprising methyl, ethyl, propyl and butyl.
  • Appropriate alkoxysilanes are for example tetramethoxysilane (TMOS), preferably tetraethoxysilane (TEOS), and methyl trimethoxysilane (MTMOS).
  • the solution A is prepared from a tetraethoxysilane (TEOS) and/or methyl trimethoxysilane (MTMOS) using a methyl, ethyl or propyl alcohol, and in particular an isopropyl alcohol, as a solvent.
  • Solution A can contain for example 25 - 35 wt% (% by weight), preferably 30 wt%, TEOS and 15 - 25 wt%, preferably 20 wt%, MTMOS, both dissolved in 40 - 60 wt%, preferably 50 wt%, isopropyl alcohol.
  • Solution B contains colloidal silica dissolved in water.
  • solution B is set with an acid, preferably with nitric acid (HNO 3 ), to a pH value between 2.0 and 4, preferably between 2.5 and 3.0 and more preferably close to 2.7.
  • the silica used is stabilized in an acid medium, where the pH is advantageously between 2 and 4.
  • the silica has advantageously alkali content as low as possible, preferably less than 0.04 wt % Na 2 O.
  • Solution B contains for example 70-80 wt%, preferably 75 wt%, water as a solvent and 20 - 30 wt%, preferably 25 wt%, colloidal silica.
  • the solution B is set with nitric acid (HNO 3 ) to a pH value between 2.0 and 3.5, preferably between 2.5 and 3.0, more preferably close to 2.7.
  • HNO 3 nitric acid
  • a sol-gel precursor supplied by company Akzo Nobel under brand name CERAPAINT ® is used to form the corrosion protection layer.
  • An aluminium alloy extruded profile part coated by the coating process step according to the invention is characterised in that it has a corrosion-resistant layer directly deposited on the aluminium alloy of the said extruded profile, except at its sawn ends.
  • the said extruded profile is advantageously made of any of the following alloys: AA 6005, AA 6005A, AA 6008, AA 6014, AA 6060, AA 6061, AA 6063, AA 6063A, AA 6056, AA 6066, AA 6082, AA 6101, AA 6110, AA 6110A, AA 6182, AA 6401 and AA 6463.
  • the said corrosion-resistant layer results from the application of the sol-gel precursor and comprises an inorganic network of polysiloxanes affiliated with alkyl groups attached to the said inorganic network with carbon bonds.
  • Such profiles have a cosmetic corrosion resistance better than uncoated profiles but they do not have to comply with any particularly demanding requirement related to their aesthetic aspect such as profiles for the building industry.
  • Such profiles are preferably structural profiles extruded from an AA6xxx aluminium alloy and heat treated to tempers T6 or T5.
  • Figure 1 illustrates schematically a conventional extrusion process scheme.
  • FIG. 2 illustrates schematically the scheme of the extrusion process according to the invention.
  • the different sol-gel precursor solutions were sprayed using a spray gun the nozzle of which had a diameter of 1.3 mm.
  • the distance between the spray gun and the substrate, the pressure of the air and the dilution of the lacquer are parameters which can be adapted to change the thickness and the appearance of the coatings.
  • Spray coatings were realised on substrates at room temperature and also on substrates pre-heated at 180°C and 230°C.
  • the reference of the spray gun, which was used, is Sata RP 2000.
  • a basic solution A as described above in a proportion of 70 wt% of the mixed solution, is added, under mechanical agitation, the solution B in a proportion of 30 wt% of the mixed solution.
  • the pH of the mixed solution is adjusted by means of nitric acid to a value of 2.7.
  • the mixed solution is agitated for around 6 hours, whereby reaction-induced heat is released, and then filtered using a polypropylene filter with pore size of 1 ⁇ m. After filtering the residue is discarded and the filtrate is allowed to rest for a period between 12 and 22 hours before being applied to the substrate to form the protective coating.
  • a solution prepared in this manner has a room temperature dynamic viscosity below 20 cP (i.e. 2 10 -2 Pa.s or Nm -2 .s) and is suitable for spray application by the equipment described above.
  • This coating precursor used for the in-line experiments (See example 3) is also characterized in that no harmful component is released during the formation of the protective layer.
  • Figure 1 illustrates schematically a conventional extrusion line, where aluminium logs are supplied by the log loader (10) and driven to the preheating oven (20).
  • the logs are sheared with a heat shearing device (25) at the exit of the preheating oven to obtain billets at the desired length.
  • the cold logs are sawed to make billets at the wished length which are then preheated, by generally using an induction furnace.
  • the hot billet is then driven towards the extrusion press (30): it is introduced into the central bore of the container (32) thanks to the mandrel (33) attached to the piston (34) which moves towards the press platen (31), where the die set is located.
  • the extrusion starts by moving forward the piston and an extruded profile exits from the die hole.
  • the puller (42) draws the profile (100) during the entire extrusion step with a speed adapted to the speed of the profile so that the profile remains straight and slightly stretched up to the run out table (50).
  • the piston (34) is stopped; the container (32) is removed from the die set so that the butt can be sheared. After the butt is sheared, the final end of the profile is released and the profile can then be drawn again by the puller until that it is fully located on the run out table.
  • a cooling device (41) is used to quench the profile at the exit of the extrusion press. Once on the run out table, the profile is generally slightly plastically stretched by a stretcher (60) and then sawn at the wished length by a sawing machine (70). The profile parts (110) thus obtained are then stacked in a storage area (80) and heat treated, generally in ageing ovens (90).
  • EXAMPLE 3 SPRAYING A SOL-GEL LACQUER AT THE EXIT OF THE EXTRUSION PRESS (FIGURE 2)
  • the extrusion line used in this example is close to the extrusion line described in example 2.
  • the main difference with the conventional extrusion line lies in that a spraying device (45) is introduced at the exit of the extrusion press, downwards of the quenching device (41) and upwards the run out table (50).
  • the spraying device is located downwards of the quenching device, typically in an area distant of approximately 6-8 meters from the last end of the bearings. In the present case, it comprises 4 spray guns.
  • the section of the profile used for this test has a quite high size. Smaller extruded profiles, exiting simultaneously from the extrusion press, could also be coated using this spraying device, provided that they are guided to have a stabilised course in the spraying area, which is quite easy to do since this area is far enough from the die exits.
  • the number and the location of the spray guns should be adapted to their shape and spatial configuration. Larger sections could also be coated in a similar way on a larger press.
  • the spraying device (45) works in coordination with the puller (42) in such a manner that there is no coating accumulation when the extrusion press is stopped for shearing the butt.

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  • Mechanical Engineering (AREA)
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  • Inorganic Chemistry (AREA)
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Claims (12)

  1. Procédé de fabrication de pièces profilées filées en alliage d'aluminium résistantes à la corrosion, comprenant les étapes suivantes :
    a) fourniture d'une billette constituée dudit alliage d'aluminium à une température adaptée à au filage ;
    b) filage de la billette à travers une filière pour obtenir au moins un profilé ayant la forme et la longueur désirées et refroidissement ou trempe du profilé après la sortie de la filière ;
    c) dépôt d'une couche résistante à la corrosion sur la surface du profilé par dépôt d'une solution fluide sur la surface métallique fraîchement formée qui sort de la presse à filer, le revêtement en résultant devenant ensuite, après évaporation et/ou durcissement et/ou toute autre transformation physique ou chimique, ladite couche résistante à la corrosion ;
    d) optionnellement, traction du profilé, pour obtenir une déformation plastique généralement inférieure à environ 1 % ;
    e) sciage du profilé extrudé pour obtenir des pièces profilées à la longueur voulue ;
    f) vieillissement des pièces profilées, dans lequel le durcissement du revêtement est achevé durant le vieillissement des pièces profilées,
    caractérisé en ce que
    ladite solution fluide est un précurseur sol-gel et le profilé subit une trempe à une température comprise entre 80 et 250 °C.
  2. Procédé selon la revendication 1, caractérisé en ce qu'un dispositif de dépôt est utilisé pour déposer ladite solution fluide, ledit dispositif de dépôt étant situé près de la sortie de la presse à filer, en aval du poste de trempe utilisé à l'étape b) et en amont du dispositif de sciage utilisé à l'étape e), de préférence en amont de la table de sortie.
  3. Procédé selon les revendications 1 ou 2, dans lequel durant l'étape b), le profilé filé est saisi par un puller (42), qui tire ledit profil durant la totalité de l'étape d'extrusion à une vitesse adaptée à la vitesse du profilé de sorte que le profilé reste rectiligne, caractérisé en ce que le dispositif de dépôt travaille en coordination avec le puller de telle sorte qu'il n'y a pas d'accumulation de revêtement quand la presse à filer est arrêtée pour cisailler le culot de filage.
  4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que la solution fluide est déposée sur ladite surface métallique fraîche par aspersion.
  5. Procédé selon l'une quelconque des revendications 1 à 4, dans lequel ladite solution fluide contient un composant inflammable, caractérisé en ce que, à la fin de l'étape b), le profilé subit une trempe à une température inférieure à la température d'auto-inflammation du matériau inflammable.
  6. Procédé selon l'une quelconque des revendications 1 à 5, dans lequel le profilé subit une trempe à une température comprise entre 140 et 210 °C, de préférence entre 150 et 200 °C.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que le précurseur sol-gel est réalisé à partir d'un mélange d'un polysiloxane, de préférence préparé à partir d'une solution alcoolique de silane, en particulier d'une solution d'alkoxysilane, et d'une solution aqueuse de silice colloïdale.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que le précurseur de sol-gel est préparé à partir de deux solutions de base A et B, dans lesquelles :
    a) la solution A est une solution alcoolique d'un ou plusieurs alkoxysilanes différents, l'alcool utilisé comme solvant étant le méthanol, l'éthanol, le propanol ou le butanol ou, de préférence, l'isopropanol, les alkoxysilanes étant décrits par la formule générale XnSi(OR)4-n dans laquelle « R » est un alkyle simple, de préférence choisi dans le groupe comprenant le méthyle, l'éthyle, le propyle et le butyle et « X » est aussi un alkyle, de préférence choisi dans le groupe comprenant le méthyle, l'éthyle, le propyle et le butyle ;
    b) la solution B est de la silice colloïdale dissoute dans l'eau.
  9. Procédé selon la revendication 8, dans lequel lesdits alkoxysilanes appartiennent au groupe comprenant le tétraméthoxysilane (TMOS), le tétraéthoxysilane (TEOS) et le méthyl triméthoxysilane (MTMOS).
  10. Procédé selon la revendication 9, dans lequel la solution A contient 25 à 35 % en poids de TEOS et 15 à 25 % en poids de MTMOS, tous deux dissous dans 40 à 60 % en poids d'isopropanol.
  11. Procédé selon l'une quelconque des revendications 8 à 10, dans lequel le pH de la solution B est ajusté avec un acide, de préférence avec de l'acide nitrique (HN03), à une valeur comprise entre 2,0 et 4, de préférence entre 2,5 et 3,0 et de préférence encore, proche de 2,7.
  12. Procédé selon l'une quelconque des revendications 7 à 11, dans lequel la concentration caustique de la silice est inférieure à 0,04 % Na20 en poids.
EP20110001244 2011-02-16 2011-02-16 Traitement de surface en ligne pour obtenir des extrusions d'aluminium revêtues avec une couche résistante à la corrosion Active EP2489448B1 (fr)

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CN106367790B (zh) * 2016-11-11 2019-04-16 佛山市三水雄鹰铝表面技术创新中心有限公司 氧化槽铝离子与硫酸回收及氧化液缓蚀与冷却节能系统
CN107164709B (zh) * 2017-04-26 2018-10-30 西安工程大学 分体式铝合金挤压型材柔性在线淬火装置及方法
IT201800004684A1 (it) * 2018-04-18 2019-10-18 Procedimento ed impianto di rivestimento di un profilato metallico e profilato cosi' ottenuto
CN113263334A (zh) * 2021-07-21 2021-08-17 佛山市通润热能科技有限公司 一种挤压机后部辅机设备
CN115069813B (zh) * 2022-07-27 2022-11-15 广东赛福智能装备有限公司 一种铝型材挤压后部生产线冷却机构
CN118180188A (zh) * 2024-05-17 2024-06-14 广东广源铝业有限公司 一种基于表面处理的铝合金型材成型工艺

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