EP2728041B1 - Beschichteter Aluminiumstreifen und Verfahren zur Herstellung - Google Patents

Beschichteter Aluminiumstreifen und Verfahren zur Herstellung Download PDF

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Publication number
EP2728041B1
EP2728041B1 EP12190670.5A EP12190670A EP2728041B1 EP 2728041 B1 EP2728041 B1 EP 2728041B1 EP 12190670 A EP12190670 A EP 12190670A EP 2728041 B1 EP2728041 B1 EP 2728041B1
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EP
European Patent Office
Prior art keywords
strip
passivation layer
aluminum
aluminum alloy
applying
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.)
Active
Application number
EP12190670.5A
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English (en)
French (fr)
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EP2728041A1 (de
Inventor
Thorleif Hoyer
M Anica Lacau
Volker Denkmann
Andreas Siemen
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.)
Speira GmbH
Original Assignee
Hydro Aluminium Rolled Products GmbH
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.)
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Publication date
Priority to DK12190670.5T priority Critical patent/DK2728041T3/en
Application filed by Hydro Aluminium Rolled Products GmbH filed Critical Hydro Aluminium Rolled Products GmbH
Priority to ES12190670.5T priority patent/ES2619427T3/es
Priority to EP12190670.5A priority patent/EP2728041B1/de
Priority to RU2015120646A priority patent/RU2639166C2/ru
Priority to PCT/EP2013/072593 priority patent/WO2014067937A1/en
Priority to CA2890114A priority patent/CA2890114C/en
Priority to CN201380057385.9A priority patent/CN104822865B/zh
Publication of EP2728041A1 publication Critical patent/EP2728041A1/de
Priority to ZA2015/02934A priority patent/ZA201502934B/en
Priority to SA515360357A priority patent/SA515360357B1/ar
Application granted granted Critical
Publication of EP2728041B1 publication Critical patent/EP2728041B1/de
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils

Definitions

  • the invention relates to a method for manufacturing a strip for retortable food packages made of an aluminum alloy as well as to the use of a coated aluminum alloy strip, a retortable food package made of said aluminum alloy strip and an apparatus for carrying out the inventive method.
  • Retortable and corrosion resistant aluminum or aluminum alloy strips are used for the manufacturing of packages like cans or cup-like food packages.
  • foodstuffs often contain ingredients which can cause corrosion of aluminum or an aluminum alloy used for manufacturing the package of the grocery, for example a food can.
  • the aluminum or the aluminum alloy of i.e. a food can has to be protected against corrosion.
  • a coating which is applied onto the aluminum strip prior to forming the food package.
  • Such a food package is known for example from the German patent application DE 40 30 646 A1 .
  • the conventional food package has several problems. On the one hand, when the coated aluminum strip or aluminum alloy strip is formed to the food package part i.e. by deep drawing the corrosion protecting coating sometimes shows damages. Thus, the corrosion protecting layer has to be provided with a greater thickness in order to prevent cracks or damages during deep drawing for example.
  • coating of a food package after deep drawing of the aluminum strip is expensive.
  • a method for manufacturing an aluminum or aluminum alloy sheet or plate, which provides a high corrosion resistance is disclosed in US 3,902,976 .
  • the aluminum or aluminum alloy sheet or plate is first anodized applying AC current in an electrolyte consisting of an aqueous solution of a mineral acid such as to form on the aluminum or aluminum alloy surface an aluminum oxide film and subsequently electrolytically treated in an aqueous solution of sodium silicate such as to form a durable abrasion resistant and corrosion-resistant barrier layer.
  • This process has the disadvantage that rinsing after anodizing and rinsing after electro-silicating is on the one hand costly and it requires on the other hand permanent treating of waste water.
  • DE 10 2011 002 837 A1 refers to a method of corrosion-proof pretreatment of tinplate.
  • DE 195 08 126 A1 discloses a method for optimizing paint adhesion on metal surfaces, in particular on aluminum surfaces, wherein the metal surface is anodized in an acid electrolyte and subsequently brought into contact with a further liquid solution.
  • WO 99/19086 shows an anodized aluminium sheet intended for use as closure stock for cans with a polyacrylic adhesion layer.
  • US 2004/0054044 A1 discloses different coatings of a metal sheet surface, but does not show any hints to retortable food packages. The same applies also to the German patent application DE 102 27 362 A1 .
  • a method for manufacturing an aluminum strip wherein the method comprises the steps of anodizing the strip and subsequently applying a passivation layer by immersing the strip into an immersion bath is known from EP 0 127 774 A2 .
  • an object of the present invention to provide a cost effective method for manufacturing an aluminum alloy strip for retortable food packages, which provide a much better corrosion behavior. Furthermore, it is an object of the present invention to provide an advantageous use of an aluminum alloy strip for retortable food package, a formed retortable food package made of the aluminum alloy strip as well as an apparatus for carrying out the inventive manufacturing method.
  • a method for manufacturing a strip for retortable food packages made of an aluminum alloy comprising the steps of:
  • an aluminum strip or an aluminum alloy strip which has been applied to the aforementioned manufacturing steps offers a very good corrosion resistant and additionally a very good adhesion for an additional top coating which allows making i.e. food packages by deep drawing the aluminum strip without damaging the top coating during the deep drawing step.
  • architectural sheets can be manufactured from these above mentioned aluminum or aluminum alloy strips comprising an improved corrosion resistance.
  • the optional desmutting step improves application of the passivation layer after immersing in the electrolyte bath.
  • a new oxide layer with a thickness of 50 nm to 300 nm is built on the surface of the strip.
  • an oxide layer of 50 nm to 160 nm is built since it allows achieving the intended corrosion resistance combined with satisfying manufacturing speeds.
  • the degreasing and anodizing of the surface of the strip and optionally the desmutting of the strip are carried out inline with applying the passivation layer on the strip.
  • Carrying out the manufacturing strips inline means that the manufacturing steps are made without coiling and decoiling the metal strip between those steps. This allows to optimize productivity of the inventive method as well as to reduce production time and expenses to manufacture such aluminum or aluminum alloy strips.
  • said degreasing and anodizing step is carried out with a sulfuric acid at a concentration of 10 wt.-% to 25 wt.-% as electrolyte with a temperature of 65°C to 90°C by applying an AC-current density of 2 to 25 A/dm 2 for an immersing time of the strip of 1.5 s to 10 s. It has been found out that the mentioned range of parameters regarding the electrolyte bath, the concentration of the sulfuric acid, the temperature range and the density of the AC-current as well as the immersing time provides the possibility to increase the manufacturing speed.
  • the passivation layer is according to a next embodiment based on a chromate-free passivation or a zirconium or titan passivation.
  • a chromate-free passivation as well as the passivation layer based on a zirconium or titan passivation has the advantage that during production less harmful materials are used.
  • a very high accuracy of the thickness of the passivation layer is achieved in that the passivation layer is coated by using roller coaters.
  • the applied passivation layer has a thickness of 2 to 10 g/m 2 , in particular 4 to 7 g/m 2 of the wet film which allows achieving the desired adhesion properties of the aluminum or aluminum strip.
  • applying the passivation layer is controlled by an inline measurement.
  • the adhesion properties of a passivation layer on the strips are very good in particular for polymer coatings or lacquered coatings.
  • a formed metal part like i.e. a cup-like food package or a coated architectural sheets, since the adhesion properties of the manufactured aluminum strips are very good. This applies in particular for a single-layer varnish top coatings and polymer coatings.
  • the degreasing and anodizing step and the step of applying the passivation layer are carried out inline with applying of a further coaling onto the passivation layer.
  • the expenses to manufacture an aluminum strip of which formed metal parts for grocery packages or coated architectural sheets can be manufactured are decreased significantly. Additionally, the quality of the top coating is increased significantly, so that the following production steps like forming, drawing, roll forming, bending can be accomplished with very low defective products.
  • an aluminum or aluminum alloy strip manufactured by the inventive method comprising an anodic oxide layer with a thickness of 50 to 300 nm, preferably 50 to 160 nm and a chromate-free passivation layer on the oxide layer.
  • an aluminum or aluminum alloy strip comprises a very good corrosion resistance because of the artificially grown oxide layer on top of the aluminum layer and as well as very good adhesion properties for a top coating which allows to produce formed metal parts like food packages or coated architectural sheets. Nevertheless, this applies to all coated formed metal parts made of aluminum or an aluminum alloy strip.
  • the strip additionally comprises an organic coating on top of the passivation layer, wherein preferably the organic coating is a lacquer, preferably a single-layer varnish or a polymer coating.
  • Organic coatings protect the aluminum layer additionally from the influence of the corrosive parts of for example groceries or corrosive components in the environment.
  • the aluminum or aluminum alloy strip comprising the additional organic coating can be easily manufactured to formed metal parts for example by deep drawing, such as cup-like food packages or architectural sheets. Both comprise very good properties with respect to the corrosion resistance.
  • Coatings for architectural sheets are based on for example pclyurethane, polyamide, polyester, high durable polyester PVDF-systems etc..
  • the aluminum or aluminum alloy strip comprises an aluminum alloy of the type AA1xxx, AA3xxx, AA5xxx or AA8xxx.
  • the thickness of the strips are preferably between 0,05 mm to 1 mm.
  • architectural sheets preferably have a thickness of between 0,15 mm and 2 mm.
  • a formed metal part made of an aluminum or aluminum alloy strip manufactured according to the present invention comprise a high resistance against damages of the top coating during forming operations of the metal parts.
  • the inventive formed metal part can be manufactured with a very low ratio of defective products.
  • the formed metal part is a package for groceries or an architectural sheet.
  • the packages for groceries have to provide different properties like formability, high corrosion resistance and a top coating which should be biocompatible.
  • these top coatings are made of a polymer resin or a lacquer more preferably a single-layer varnish. Due to the good adhesion properties of the aluminum or aluminum alloy strip of the present invention comprising the artificial oxide layer and the passivation layer a package for groceries made of the inventive aluminum or aluminum strip can be produced with lower expenses and insures a very high level of package quality.
  • the architectural sheet has to provide a very good corrosion resistance as well as very good adhesion properties for the top coating which is applied commonly on both sides of sheet. Typical architectural sheets are façade components, roller shutters and façade structural components which are in permanent contact with water, i.e. rain and the humidity of the air.
  • the inventive apparatus it is possible to manufacture a coated aluminum strip with the inventive manufacturing method without coiling and decoiling the strip between the step of degreasing and anodizing and the application of the passivation layer.
  • a coil of an aluminum or aluminum alloy strip comprising an anodic oxide layer with the thickness of 50 nm to 300 nm, preferably 50 nm to 160 nm and comprising a passivation layer, in particular a chromate-free passivation layer on top of the anodic oxide layer.
  • Means to dry the passivation layer allow a quick coiling of the passivated aluminum strip.
  • the optional means for desmutting the anodized strip allow a quick preparing of the aluminum strip for the application of the passivation layer in the next manufacturing step.
  • Such a coil can be coated easily with a top coating for a desired package, wherein the coating can be adapted to the particular application like food packages or architectural sheets.
  • the apparatus comprises additionally means to coat the strip with a top coating on the passivation layer.
  • An organic coating on the passivation layer may serve to improve the properties for forming food packages by deep drawing as well as providing additionally a protection for corrosion.
  • FIG. 1 shows in a schematical view the different manufacture steps A, B, C, D and E on the right side and on the left side sectional views of the strip resulting from step B, C, D and E and with respect to step A a sectional view of an aluminum or aluminum alloy strip with which the shown embodiment starts with.
  • An aluminum alloy strip made of the aluminum alloys of type AA1xxx, AA3xxx, AA5xxx or AA8xxx is the starting point of the inventive manufacturing process.
  • the thickness of the strip depends on the application. In general the thicknesses of the aluminum or aluminum alloy strip is between 0,05 mm and 2,5 mm, preferably for food packages between 0,05 mm and 1,0 mm and for architectural sheets between 0,15 mm and 2,0 mm.
  • the aluminum alloy strip 1 prior to step A with comprises on top of the aluminium alloy strip 1 a first layer 2 which is the natural oxide layer of the strip comprising additionally undesirable contaminations. The oxide layer and the contaminations present in the surface of the aluminum or aluminum alloy strip result from the rolling process of the strip.
  • Such a strip is uncoiled in the step A and is provided to a degreasing and anodizing step 3.
  • the degreasing an anodizing step is preferably carried out with a sulfuric acid at a concentration of 10 wt.-% to 25 wt.-%, preferably 12 wt.-% to 17 wt.-% as an electrolyte with a temperature of 65°C to 90°C by applying an AC-current density of 2 to 25 A/dm 2 , preferably 4 to 22 A/dm 2 for an immersing time of the strip of 1.5 s to 10 s, preferably 3 to 6 s.
  • the aluminum alloy strip 1 now comprises an artificially grown anodic oxide layer 3 on top of the surface of the aluminum strip 1.
  • the degreased and anodized aluminum or an aluminum alloy strip comprises an oxide layer with a thickness of 50 nm to 300 nm, preferably 50 nm to 160 nm. Due to the thickness of the oxide layer the aluminum below the oxide layer is protected effectively against corrosion. In the present drawings the thicknesses of the different layers are not true to scale.
  • Such a strip is now provided to the next manufacturing step C according which a passivation layer 4 is applied on top of the oxide layer 3.
  • a desmutting step B' can be applied to the degreased and anodized strip in order to provide an optimized surface for applying the passivation layer.
  • the passivation layer 4 is applied on both sides of the aluminum strip 1 it is possible that only on one side a passivation layer is applied to the aluminum strip.
  • the passivation layer has a thickness of 2 to 10 g/m 2 of the wet film before drying the no-rinse passivation layer.
  • the zirconium or titan passivation is one particular chromate-free passivation. With a chromate-free passivation layer the use of harmful substances during production can be avoided.
  • Architectural sheets as well as food packages take benefit of the improved adhesion properties caused by the passivation layer of the strip in the view of the adhesion of the top coating.
  • the aluminum strip or aluminum alloy strip may be recoiled because after passivation the aluminum strip or aluminum alloy strip can be stored in step C' in order to optimize production capacity.
  • the strip is coated in the next manufacturing step D with a top coating on top of the passivation layer.
  • the sectional view of the aluminum alloy strip 1 shows that the strip now comprises an outer layer 5 which may be an organic coating 5 consisting of a lacquer, i.e. a one-layer varnish or for example of a polymer coating.
  • the aluminum alloy strip 1 of step D can be easily manufactured to a cup like food package as shown on the left side of step E.
  • the coated aluminum strip according to step D is preferably formed into a food package or an architectural sheet by deep drawing or other forming techniques, like roll forming or the like.
  • the strip may be cut into sheets first and is formed subsequently to food package or architectural sheet.
  • the advantage of the inventive aluminum or aluminum alloy strip is that during deep drawing or other forming steps to build a food package or architectural sheet 6 as shown on the left side to step E the top coating 5 of the aluminum or aluminum alloy strip is not damaged. This is caused by the good adhesion properties of the passivation layer manufactured by said no-rinse step.
  • FIG. 2 An embodiment of an inventive apparatus for carrying out the inventive manufacturing process is shown in a schematical view in Fig. 2 .
  • an uncoiler 7 an aluminum or an aluminum alloy strip 1 is uncoiled and provided to a degreasing and anodizing step B in which the degreasing and anodizing is carried out by using sulfuric acid under the condition already outlined under manufacturing step B of Fig. 1 .
  • step B' the aluminum or aluminum alloy strip 1 is desmutted and optionally dried.
  • the aluminum strip or aluminum alloy strip 1 is than provided to a device which carries out the manufacturing step C which applies a passivation layer onto the surface of the strip by using a no-rinse coil coating application.
  • application of the passivation layer is preferably done by using roller coaters C1 and C2.
  • Means to measure the passivation layer thickness are not shown in Fig. 2 but are advantageously used to control the thickness of the passivation layer.
  • the no-rinse passivation layer 4 which is preferably a chromate-free passivation layer or a zirconium or titan passivation layer is dried and in device 9 the aluminum strip is cooled again.
  • it is possible to coil the coated strip 1 now because due to the passivated surface of the strip it is possible to store a coil of the strip with such a coating without problems.
  • the aluminum or aluminum alloy strip 1 is provided inline to a further coating step D in which a top coating 5 is applied onto the aluminum strip or aluminum alloy strip.
  • a roller coater is used again.
  • the top coat is than dried in device 8' and the aluminum or aluminum alloy strip 1 is cooled down in device 9' in order to prepare the aluminum strip 1 for recoiling on recoiler 10.
  • Fig. 3a and b) show photos of an exemplary embodiment Fig. 3a ) and an inventive embodiment, Fig. 3b ).
  • the exemplary embodiment Fig. 3a ) comprises a top coating which is damaged at a specific location of the deep drawn food package 11 shown in Fig. 3a ) which is caused by a low adhesion of the top coating on the surface of the aluminum alloy strip.
  • the deep drawn inventive embodiment does not have any damages in the top coating of the food package 11.
  • Fig. 4 shows the anodic oxide layer 12 having a thickness of nearly to 100 nm in a micro section.
  • the combination of the relatively thick anodic oxide layer of 50 nm up to 300 nm which provides a very effective corrosion resistant together with the use of a passivation layer applied by no-rinse coil coating process allows to produce an aluminum strip or aluminum alloy strip which provides very good corrosion resistance combined with a good adhesion for top coatings.
  • aluminum or aluminum alloy strip according to the present invention can be used very easily to manufacture food packages or i.e. architectural sheets, which comprise necessarily a top coating and which are formed by applying forming operations to a coated strip or coated sheet.
  • Fig. 5 shows an architectural sheet 13.
  • the architectural sheet 13 comprises a plurality of cuttings 14 and bended parts 13a.
  • the cuttings are made into the architectural sheet 13 after applying the inventive method, thus the inventive method is applied to an aluminum strip without cuttings.
  • the strip is than coated with a top coat which can be made of a polymer.
  • cuttings are made into the architectural sheet after applying the method the architectural sheet has a good corrosion resistance due to the excellent corrosion resistance and adhesion properties of the coated areas.
  • bending of the flat strip to a bended architectural sheet as shown in Fig. 5b does not change the corrosion resistance, since the architectural sheet has beside the corrosion resistance of the anodic oxide layer very good adhesion properties for its top coating.
  • roller shutter 15 Another application of an architectural sheet is the roller shutter 15 shown in Fig. 6 .
  • a roller shutter made from an aluminum alloy strip treated with the inventive method offers higher corrosion resistance combined with a very good adhesion of the top coating on the passivation layer.
  • the good adhesion properties of the passivation layer combined with the high corrosion resistance of the anodic oxide layer leads to less defective goods during production of the roller shutter 15, in particular during rollforming of the coated strip.
  • the roller shutter 15 comprises excellent corrosion resistance even in the vicinity of cuttings of the roller shutter (not shown in the drawings).

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Coating With Molten Metal (AREA)

Claims (15)

  1. Verfahren zur Herstellung eines Bands für sterilisierbare Lebensmittelverpackungen, die aus einer Aluminiumlegierung hergestellt sind, mit den Schritten:
    - Entfetten und Eloxieren der Oberfläche des Bands durch Eintauchen des Bands in ein Säureelektrolytbad und Anlegen von Wechselstrom, wobei das Entfetten und Eloxieren der Oberfläche des Bands zu einer künstlich aufgebauten Oxidschicht führt, optional gefolgt von einem Dekapierungsschritt, und
    - Aufbringen einer Passivierungsschicht auf der Oberfläche des Bands unter Verwendung eines No-Rinse-Coil-Beschichtungsverfahrens,
    - wobei die aufgebrachte Passivierungsschicht eine Dicke von 2 bis 10 g/m2 des nassen Films aufweist.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass
    während des Entfettungs- und Eloxierungsschritts eine neue Oxidschicht mit einer Dicke von 50 nm bis 300 nm auf der Oberfläche des Bands aufgebaut wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass
    das Entfetten und Eloxieren der Oberfläche des Bands und das optionale Dekapieren des Bands inline mit dem Aufbringen der Passivierungsschicht auf dem Band durchgeführt werden.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass
    der Entfettuns- und Eloxierungsschritt mit einer Schwefelsäure in einer Konzentration von 10 Gew.-% bis 25 Gew.-% als Elektrolyt mit einer Temperatur von 65 °C bis 90 °C durch Anwenden einer Wechselstromdichte von 2 bis 25 A/dm2 für eine Eintauchzeit des Bands von 1,5 s bis 10 s durchgeführt wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass
    die Passivierungsschicht auf einer chromatfreien Passivierung oder auf einer Zirconium- oder Titan-Passivierung basiert.
  6. Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass
    die Passivierungsschicht unter Verwendung eines Rollenbeschichters aufgebracht wird.
  7. Verfahren nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass
    das Aufbringen einer Passivierungsschicht durch eine Inline-Messung gesteuert wird.
  8. Verfahren nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass
    nach dem Aufbringen und Trocknen der Passivierungsschicht wenigstens eine weitere Beschichtung auf der Passivierungsschicht des Bands aufgebracht wird.
  9. Verfahren nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, dass
    der Entfettungs- und Eloxierungsschritt und der Schritt des Aufbringens der Passivierungsschicht inline mit dem Aufbringen einer weiteren Beschichtung auf der Passivierungsschicht durchgeführt werden.
  10. Verwendung eines Aluminiumlegierungsbands für retortierbare Lebensmittelverpackungen, die gemäß einem Verfahren nach Anspruch 1 bis 9 hergestellt sind, die eine anodische Oxidschicht mit einer Dicke von 50 bis 300 nm und eine chromatfreie Passivierungsschicht auf der Oxidschicht aufweisen, wobei die aufgebrachte Passivierungsschicht eine Dicke von 2 bis 10 g/m2 des nassen Films aufweist.
  11. Verwendung nach Anspruch 10, dadurch gekennzeichnet, dass
    das Band zusätzlich eine organische Beschichtung auf der Oberseite der Passivierungsschicht aufweist.
  12. Verwendung nach Anspruch 10 oder 11, dadurch gekennzeichnet, dass
    das Band eine Aluminiumlegierung des Typs AA1xxx, AA3xxx, AA5xxx oder AA8xxx aufweist.
  13. Geformte Lebensmittelverpackung hergestellt aus einem Aluminiumlegierungsband nach Anspruch 10 bis 13.
  14. Vorrichtung zur Durchführung eines Verfahrens nach Anspruch 1 bis 8, aufweisend:
    - eine Abwickelvorrichtung zum Abwickeln eines Bands aus Aluminium oder aus einer Aluminiumlegierung,
    - Mittel zum Entfetten und Eloxieren des Bands durch Eintauchen des Bands in ein Bad eines Säureelektrolyts und Mittel zum Anlegen eines Wechselstroms auf das Band,
    - optional Mittel zum Dekapieren des eloxierten Bands,
    - Mittel zum Aufbringen einer No-rinse-Coil-Beschichtungspassivierung auf der Bandoberfläche,
    - Mittel zum Trocknen der Passivierungsschicht auf dem Band und
    - eine Aufwickelvorrichtung zum Aufwickeln des Bands.
  15. Vorrichtung nach Anspruch 14, dadurch gekennzeichnet, dass
    die Vorrichtung zusätzlich Mittel zum Beschichten des Bands mit einer Deckschicht auf der Passivierungsschicht enthält.
EP12190670.5A 2012-10-30 2012-10-30 Beschichteter Aluminiumstreifen und Verfahren zur Herstellung Active EP2728041B1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
ES12190670.5T ES2619427T3 (es) 2012-10-30 2012-10-30 Banda de aluminio revestido y método de fabricación
EP12190670.5A EP2728041B1 (de) 2012-10-30 2012-10-30 Beschichteter Aluminiumstreifen und Verfahren zur Herstellung
DK12190670.5T DK2728041T3 (en) 2012-10-30 2012-10-30 Coated aluminum strip and method of manufacture
PCT/EP2013/072593 WO2014067937A1 (en) 2012-10-30 2013-10-29 Coated aluminum strip and method for manufacturing
RU2015120646A RU2639166C2 (ru) 2012-10-30 2013-10-29 Алюминиевая полоса с покрытием и способ ее производства
CA2890114A CA2890114C (en) 2012-10-30 2013-10-29 Coated aluminum strip and method for manufacturing
CN201380057385.9A CN104822865B (zh) 2012-10-30 2013-10-29 涂覆铝带材及其制造方法
ZA2015/02934A ZA201502934B (en) 2012-10-30 2015-04-29 Coated aluminum strip and method for manufacturing
SA515360357A SA515360357B1 (ar) 2012-10-30 2015-04-29 شريط المنيوم مطلي وطريقة صنعه

Applications Claiming Priority (1)

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RU (1) RU2639166C2 (de)
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CN108149295A (zh) * 2017-12-26 2018-06-12 北京派尔特医疗科技股份有限公司 半自动化丝材微弧氧化系统及其氧化、清洗设备和方法
CN114892236A (zh) * 2022-04-08 2022-08-12 辽宁忠旺集团有限公司 一种铝合金交流阳极氧化工艺

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DE10227362A1 (de) * 2002-06-19 2004-01-08 Basf Ag Komplexbildner für die Behandlung von Metall- und Kunstoffoberflächen
US20040054044A1 (en) * 2000-10-11 2004-03-18 Klaus Bittner Method for coating metallic surfaces with an aqueous composition, the aqueos composition and use of the coated substrates

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ES8406565A1 (es) * 1983-05-03 1984-07-16 Alvarez Sanchis Elia Mari Procedimiento para la proteccion del aluminio, previamente anodizado.
DE4030646A1 (de) 1990-09-25 1992-04-02 Effem Gmbh Schalenpackung
DE19508126A1 (de) * 1995-03-08 1996-09-12 Henkel Kgaa Chromfreies Verfahren zur Verbesserung der Lackhaftung nach Dünnschicht-Anodisierung
AU6120999A (en) * 1999-09-29 2001-04-30 Europa Metalli S.P.A. An electrochemical method for forming an inorganic covering layer on a surface of a copper material
US10041176B2 (en) * 2005-04-07 2018-08-07 Momentive Performance Materials Inc. No-rinse pretreatment methods and compositions
RU2354759C1 (ru) * 2007-09-24 2009-05-10 Государственное образовательное учреждение высшего профессионального образования Пензенская государственная технологическая академия Способ получения покрытий
RU2424381C1 (ru) * 2010-06-07 2011-07-20 Государственное образовательное учреждение высшего профессионального образования "Тверской государственный технический университет" Способ получения износостойкого покрытия на алюминии и его сплавах
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WO1999019086A1 (en) * 1997-10-13 1999-04-22 Alcan International Limited Coated aluminium workpiece
US20040054044A1 (en) * 2000-10-11 2004-03-18 Klaus Bittner Method for coating metallic surfaces with an aqueous composition, the aqueos composition and use of the coated substrates
DE10227362A1 (de) * 2002-06-19 2004-01-08 Basf Ag Komplexbildner für die Behandlung von Metall- und Kunstoffoberflächen

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RU2015120646A (ru) 2016-12-20
RU2639166C2 (ru) 2017-12-20
CN104822865B (zh) 2017-02-22
CA2890114A1 (en) 2014-05-08
SA515360357B1 (ar) 2016-11-13
CN104822865A (zh) 2015-08-05
WO2014067937A1 (en) 2014-05-08
ZA201502934B (en) 2017-07-26
ES2619427T3 (es) 2017-06-26
EP2728041A1 (de) 2014-05-07
DK2728041T3 (en) 2017-03-20
CA2890114C (en) 2016-07-19

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