EP2489448B1 - Inline-Oberflächenbehandlung zur Herstellung von Aluminiumstrangpressprofilen mit korrosionsbeständiger Beschichtung - Google Patents

Inline-Oberflächenbehandlung zur Herstellung von Aluminiumstrangpressprofilen mit korrosionsbeständiger Beschichtung Download PDF

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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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French (fr)
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EP2489448A1 (de
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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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Claims (12)

  1. Verfahren zur Herstellung von korrosionsbeständigen Strangpressprofilteilen aus Aluminiumlegierung, bestehend aus folgenden Schritten:
    a) Bereitstellen eines Pressbolzens aus der Aluminiumlegierung bei einer zum Strangpressen geeigneten Temperatur;
    b) Hindurchdrücken des Pressbolzens durch ein Presswerkzeug, um mindestens ein Profil mit der gewünschten Form und Länge zu erhalten, und Abkühlen oder Abschrecken des Profils nach dem Austritt aus dem Presswerkzeug;
    c) Aufbringen einer korrosionsbeständigen Schicht auf die Oberfläche des Profils durch Auftragen einer dünnflüssigen Lösung auf die frisch geformte Metalloberfläche, die aus der Strangpresse austritt, wobei die dadurch entstehende Beschichtung anschließend durch Verdampfung und/oder Aushärtung und/oder durch eine beliebige andere physikalische oder chemische Verarbeitung die korrosionsbeständige Schicht bildet;
    d) Ggf. Ziehen des Profils, um eine plastische Verformung von gewöhnlich weniger als etwa 1 % zu erhalten;
    e) Sägen des Strangpressprofils, um Profilteile mit der gewünschten Länge zu erhalten;
    f) Auslagern der Profilteile, wobei die Aushärtung der Beschichtung während der Auslagerung der Profilteile abgeschlossen wird,
    dadurch gekennzeichnet, dass
    die dünnflüssige Lösung ein Sol-Gel-Vorläufer ist und das Profil bei einer Temperatur zwischen 80 °C und 250 °C abgeschreckt wird.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass eine Aufbringvorrichtung zum Auftragen der dünnflüssigen Lösung verwendet wird, wobei die Aufbringvorrichtung in der Nähe des Strangpressenausgangs nach der in Schritt b) verwendeten Abkühlstation und vor der in Schritt e) verwendeten Sägeeinrichtung, vorzugsweise vor dem Auslauftisch angeordnet ist.
  3. Verfahren nach Anspruch 1 oder 2, wobei das Strangpressprofil im Schritt b) von einem Puller (42) ergriffen wird, der das Profil während des gesamten Strangpressschritts mit einer der Profilgeschwindigkeit angepassten Geschwindigkeit so zieht, dass das Profil gerade bleibt, dadurch gekennzeichnet, dass die Aufbringvorrichtung mit dem Puller so zusammenarbeitet, dass sich keine Beschichtung ansammelt, wenn die Strangpresse angehalten wird, um den Pressrest abzuschneiden.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die dünnflüssige Lösung durch Aufsprühen auf die frische Metalloberfläche aufgebracht wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, wobei die dünnflüssige Lösung einen brennbaren Bestandteil enthält, dadurch gekennzeichnet, dass das Profil am Ende von Schritt b) bei einer Temperatur abgeschreckt wird, die unterhalb der Selbstzündungstemperatur des brennbaren Materials liegt.
  6. Verfahren nach einem der Ansprüche 1 bis 5, wobei das Profil bei einer Temperatur zwischen 140 °C und 210 °C, bevorzugt zwischen 150 °C und 200 °C abgeschreckt wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass der Sol-Gel-Vorläufer aus einem Gemisch aus einem Polysiloxan, bevorzugt hergestellt aus einer alkoholischen Silanlösung, insbesondere einer Alkoxysilanlösung, und einer wässrigen Lösung aus kolloidaler Kieselsäure hergestellt wird.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass der Sol-Gel-Vorläufer aus zwei Basislösungen A und B hergestellt wird, wobei:
    a) die Lösung A eine alkoholische Lösung aus einem oder mehreren unterschiedlichen Alkoxysilanen ist, wobei der als Lösungsmittel verwendete Alkohol Methanol, Ethanol, Propanol, Butanol oder bevorzugt Isopropanol ist, wobei die Alkoxysilane durch die allgemeine Formel XnSi(OR)4-n dargestellt sind, worin "R" ein einfaches Alkyl ist, bevorzugt ausgewählt aus der Gruppe bestehend aus Methyl, Ethyl, Propyl und Butyl, und "X" ebenfalls ein Alkyl ist, bevorzugt ausgewählt aus der Gruppe bestehend aus Methyl, Ethyl, Propyl und Butyl;
    b) die Lösung B in Wasser gelöstes kolloidale Kieselsäure ist.
  9. Verfahren nach Anspruch 8, wobei die Alkoxysilane zu der Gruppe bestehend aus Tetramethoxysilan (TMOS), Tetraethoxysilan (TEOS) und Methyl-Trimethoxysilan (MTMOS) gehören.
  10. Verfahren nach Anspruch 9, wobei die Lösung A 25-35 Gew.-% TEOS und 15-25 Gew.-% MTMOS enthält, beide gelöst in 40-60 Gew.-% Isopropanol.
  11. Verfahren nach einem der Ansprüche 8 bis 10, wobei der pH-Wert der Lösung B mit einer Säure, bevorzugt mit Salpetersäure (HNO3), auf einen Wert zwischen 2,0 und 4, bevorzugt zwischen 2,5 und 3,0 und besonders bevorzugt auf einen Wert nahe 2,7 eingestellt wird.
  12. Verfahren nach einem der Ansprüche 7 bis 11, wobei die Ätznatronkonzentration der Kieselsäure weniger als 0,04 Gew.-% Na20 beträgt.
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