EP0959152A1 - Gewickelter Aluminiumlegierungsband, Verfahren zur Herstellung und Anlage dafür - Google Patents

Gewickelter Aluminiumlegierungsband, Verfahren zur Herstellung und Anlage dafür Download PDF

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Publication number
EP0959152A1
EP0959152A1 EP98870116A EP98870116A EP0959152A1 EP 0959152 A1 EP0959152 A1 EP 0959152A1 EP 98870116 A EP98870116 A EP 98870116A EP 98870116 A EP98870116 A EP 98870116A EP 0959152 A1 EP0959152 A1 EP 0959152A1
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EP
European Patent Office
Prior art keywords
aluminum alloy
surface treatment
face
aluminum
layer
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.)
Withdrawn
Application number
EP98870116A
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English (en)
French (fr)
Inventor
Luc Langer
Bart Van Der Linden
Philippe Ramirez
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.)
Coil SA
Original Assignee
Coil SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Coil SA filed Critical Coil SA
Priority to EP98870116A priority Critical patent/EP0959152A1/de
Publication of EP0959152A1 publication Critical patent/EP0959152A1/de
Withdrawn legal-status Critical Current

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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
    • C25D11/04—Anodisation of aluminium or alloys based thereon

Definitions

  • the present invention relates to a coil in aluminum alloy formed by a continuous ribbon having undergone one or more surface treatments.
  • the present invention also relates to a process for continuously obtaining said coil; comprising in particular a step of processing surface of an aluminum alloy coil.
  • alloys aluminum it is understood that this alloy may have an aluminum content of 99.99% by mass.
  • Aluminum has the property to react very quickly with the oxygen in the air to form a very thin aluminum oxide surface layer.
  • the thickness of the layer thus formed can be of the order of 0.01 micron.
  • the principle of electrolysis works by applying a continuous electrical voltage between two electrodes immersed in the aqueous solution, one of the two electrodes being positively charged (anode) to oxidize water into gaseous oxygen (O 2 ) which is releases electrolytic solution while the other negatively charged electrode (cathode) causes the reduction of water to hydrogen gas (H 2 ).
  • the material surface aluminum alloy As anode, we proceed to the anodization of aluminum where the gaseous oxygen is releasing during electrolysis, quickly leads to forced oxidation of aluminum to form a layer aluminum oxide, also called anodic layer.
  • the metal surface must be clean to ensure the formation of an aluminum oxide layer continuous and to obtain a good bonding of this layer.
  • the classical technique includes stages of preparation of the metal surface by degreasing operations, pickling and neutralization.
  • the purpose of anodizing treatment with electrolysis aims to obtain more resistant protection, more uniform and more durable than aluminum.
  • anodizing by electrolysis is carried out discontinuously, i.e. in a batch-by-batch process which firstly consists of shape the parts based on aluminum and only then anodize the part in question.
  • anodizing on one side processes discontinuous, consisting first of all in anodizing the two faces, for example by a continuous process known per se, and then cut the sheets into sheets. On each sheets, the oxide layer is then removed on a face either chemically or mechanically with all handling issues previously mentioned.
  • GB-1,055,001; WO 84/0493; GB-59020498 and JP 53012738 describe methods continuous anodizing according to which only one face of the foil based on metallic aluminum is anodized.
  • the ribbon of aluminum flows between two electrodes (anode-cathode) to inside an electrolytic solution with one side facing the anode and the other side facing the cathode, the side of the ribbon facing the anode oxidizing predominantly.
  • the state ribbons of the do not lend themselves to a multitude of applications, especially in the field of electronics and sandwich structures, and more specifically in the case where it is necessary to have a room with a free face a layer of electrical insulating oxide and the other side insulating and possibly decorative in the form of a anodic layer.
  • the present invention aims to obtain a new product in the form of an alloy coil aluminum ready to be used for electronic purposes, mechanical or other, avoiding the disadvantages of state of the art products, especially those resulting from the presence of an oxide layer on both sides of the ribbon.
  • Another object of the present invention is to obtain an aluminum alloy coil having undergone surface treatment suitable for areas specific applications, such as an alloy coil aluminum surface treated ready for use and suitable for be cut into pieces for their machining and mechanical transformation.
  • a purpose complementary to this invention aims to obtain a new process for obtaining these products and an installation for their implementation.
  • Said coil according to the invention is in aluminum alloy and includes a ribbon which features on one side an anodic layer of aluminum oxide and on the other side at least one non-anodic layer other than that resulting from anodization of aluminum.
  • Ribbon means the unwound part of the coil which can be subjected to a surface treatment.
  • anode layer is meant a aluminum oxide layer that results from oxidation forced aluminum through an electrolysis process, called also anodizing.
  • the anode layer obtained by electrolysis has a thickness of at least 0.05 micron in oxide aluminum.
  • the chemical nature of the non-anode layer is chosen according to the applications for which the coil will be intended. So, it can be made up a chemical conversion layer obtained by reaction of aluminum or any other element included in the alloy aluminum with a chemical compound.
  • the non-anodic layer can also include an undercoat or primer often called “primer” which serves as the basis for a layer of finish and that is either immediately applied online aluminum alloy tape surface treatment, either applied by the user with a brush or by any another well-known means of application.
  • primer an undercoat or primer often called "primer” which serves as the basis for a layer of finish and that is either immediately applied online aluminum alloy tape surface treatment, either applied by the user with a brush or by any another well-known means of application.
  • the primer may also be a layer of base for glue or adhesive material.
  • non-anode layer may include a coat of varnish, lacquer or top coat usually used for decorative purposes.
  • the aluminum alloy coil is also characterized by the fact that a layer of chemical or primer conversion and / or a coat of lacquer, varnish or other finish can be deposited above the anodic oxide layer aluminum.
  • the aluminum alloy constituting the ribbons of the coil may include other metallic elements, such as Si, Cu, Fe, Mg, Mn, Zn, Sn, Ti, Pb, Sb, Bi, Ni, V, Sr, Te in minor quantity with a content aluminum at least 60% by mass.
  • the layer anode according to the present invention may have a thickness up to 100 microns.
  • the aluminum alloy coil according to the invention has the advantage of comprising layers of surface treatment which have properties of uniform surface over a length of several kilometers.
  • the appearance, color and thickness of the layers can be kept homogeneous at least on the tape of an entire reel.
  • the present invention also relates to a online process, that is to say that works continuous to get aluminum alloy coil according to the invention.
  • the advantage of the continuous process according to the invention is a considerable time saver given that the aluminum alloy ribbon undergoes in one successively passing the degreasing treatments, pickling, anodizing and possibly clogging single-sided and processing operations surface of the other side with possibly operations intermediate rinsing and drying.
  • the continuous process according to the invention has the advantage of controlling the quality of treatments performed at the surface in real time and at the speed of sheet scrolling.
  • thick anode layers can be obtained even on a thin sheet.
  • thicknesses of ribbon 0.05 to 5 mm can be used in this process by continuous, while ensuring the same quality of finished product.
  • the continuity of the product to be treated is ensured by a hooking in the form of welding, stapling or end-to-end bonding of aluminum alloy tape unwound from its reel.
  • the process of the present invention prevents the formation of an oxide layer on the non-aluminum alloy ribbon surface subjected to anodizing treatment by masking thereof before the anodizing operation.
  • This masking operation can be performed in particular by applying a masking overlay such as a protective film or "coating" with low electrical conductivity on one of the two surfaces aluminum alloy tape.
  • the masking operation includes forming a layer masking by treatment of one of the two surfaces of the tape aluminum alloy.
  • this surface treatment involves applying a layer of chemical conversion, a primer and / or a coat decorative. This step can optionally be followed an additional masking operation per application of a recovery.
  • the masking operation can be performed before or after the strip stripping operation aluminum. However, it may be preferred that the masking be performed after the degreasing operation of the aluminum alloy tape that removes the oxide layer naturally formed on it.
  • the masking layer or strip which is applied to one of the surfaces of the tape must resist physically and chemically in operations and baths used during the anodizing step and possibly during the steps preceding and following this step anodizing.
  • the plastic used to form the protective layer or the plastic strip is based on PVC marketed under the name of SPV224® by Nitto S.A.
  • the surface treatment of the non-anodized face is to apply a conversion layer chemical, a primer and / or a decorative layer according to methods well known from the state of the art.
  • anodized and non-anodized faces can also be provided with layers additional.
  • it can be provided apply a coat of paint when it comes to to use this side of the product for decorative purposes.
  • the aluminum alloy coil treated in surface according to the invention can be used for several industrial applications especially in the field electronics, and in structural manufacturing "sandwich".
  • housings which house one or several electronic components and which, at the same time, serve as Faraday's cage to protect the environment possible electromagnetic radiation emitted by said components.
  • the Faraday cage can also be obtained by simple machining and mechanical transformation of the aluminum alloy coil thus treated.
  • sandwich structure consisting of the alloy coil aluminum comprising an anodized face and a face provided with a primer; these sandwich structures are preferably Al-wood, Al-polymer type panels, Al-composite, Al-ceramic, Al-metal.
  • the face aluminum alloy panel external decoration and includes the anodized layer of aluminum oxide then the inner side is provided with a primer which must be corrosion resistant and which in some case, must have a very high adhesion power vis-à-vis glue or vis-à-vis the middle, that is to say the wood, polymer, composite, metal, ceramic or any other material on which the internal face will be placed.
  • a final aspect of the present invention concerns the installation for obtaining the coil of the invention obtained according to the process of the invention, in particular an installation comprising means for a surface treatment of an alloy coil ribbon aluminum, according to the method of the invention.
  • the product as shown in FIG. 1 is an aluminum alloy ribbon (A) and one side of which is provided with an anodic layer (B) of aluminum oxide and the other side is provided with a layer (C) of nature chemical other than that from the anodization of the metallic aluminum contained in said alloy presented in the form of a reel.
  • the product of the invention is also characterized by an additional layer (D) on the layer anodic (B) aluminum oxide.
  • the layers (C) and (D) may consist of either a layer of chemical conversion ( ⁇ ), or of a primer layer ( ⁇ ), either a top coat ( ⁇ ) or a combination said layers ( ⁇ , ⁇ , ⁇ ) according to the application to which the aluminum alloy tape will be used.
  • the aluminum alloy tape (A), designated 5005H14 according to Aluminum Association Inc. Series, has a thickness 2.5mm and a width of 1200mm, the anode layer (B) is 7 microns thick, the layer of nature chemical (C) includes the product Bonderite 4504®, marketed by Parker S.A., and the diaper additional (D) is a colored layer per electrolytic in Sn salt and clogged in water boiling.
  • Fig. 2 represents an installation for obtaining the aluminum alloy coil obtained according to the method of the present invention.
  • the method comprises a line for processing surface allowing an alloy coil to be obtained of aluminum, the strip of which comprises on one side, a layer anodic aluminum oxide coated with a layer of paint and, on the other side, a chromated layer also covered with a layer of paint.
  • the process for obtaining the coil in aluminum alloy used in the installation shown in Figure 2 successively includes alloy ribbon surface preparation operations aluminum by degreasing (unit 7), pickling (unit 11) and neutralization (unit 12) of the aluminum tape, a masking step (unit 11) of one of the two sides of the ribbon of aluminum by applying a plastic strip of covering, an anodizing step (unit 13) of the face not covered with aluminum alloy tape followed possibly a sealing operation (unit 15) of the anode layer, then an unmasking operation (unit 17) of the non-anodized face which consists in removing the plastic covering strip previously deposited during the masking step (unit 11), a processing of surface of this non-anodized surface by chromation (unit 18) thereof and finally a surface treatment of the anodized side and the chromated side of the ribbon aluminum alloy by application of a layer of painting (unit 20).
  • flushing operations units 8,12,14
  • drying units 9, 19
  • cooking unit 19
  • the step to obtain the anodization of a only one side of the tape consists of hiding one of the two sides tape by applying a protective covering (unit 10). It is certain that this step must be before the anodizing operation (unit 13). However, the masking step (unit 10) can be performed both before and after the pickling operation (unit 11).
  • the degreasing step (unit 7) is made by soaking at 50 ° C in a tank with a length of 8m which contains the Almeco 151B® product marketed by Henkel S.A ..
  • this step can also be performed by spraying, which has the advantage of generating a mechanical effect linked to a permanent renewal of the degreasing agent on the surface to be treated.
  • other degreasing agents such as emulsifiers commercial, slightly caustic, well known to man can be used to remove products oily from the metal surface.
  • the pickling step (unit 11) is preferably carried out in a 10m long tank and consists in making the metal surface uniform by eliminating the last impurities and rolling defects, provided that these are not too pronounced.
  • the pickling agents used can be acidic or basic.
  • the pickling agent can be a caustic soda solution containing between 20 and 70 g / l NaOH and between 20 and 120 g / l Na [Al (OH) 4 ].
  • the pickling step makes it possible to guarantee the uniformity of the surface of an entire coil and this over a length of several kilometers.
  • the pickling operating conditions can be chosen so as to produce different surface aspects of the "melt-finish" or satin type for example.
  • the neutralization stage (unit 12) it is also preferably carried out in a 10m tank long. It follows the stripping step to neutralize the surface before proceeding to its anodization which will run in a slightly acidic environment.
  • the tank can contain the Adeox C® product marketed by CCT S.A. This step is necessary, when pickling is carried out in basic medium while anodizing is carried out in acidic environment.
  • the quality of surface treatments of aluminum alloy tape also depends on the quality baths, so that rinsing operations (units 8,12,14) and drying (units 9, 19) are added between said stages of preparation and surface treatment of the metal surface. In order to ensure purity constant rinse water, this is brought by devices installed online in the process.
  • the anodization step (unit 13) is preferably carried out in a tank with a length of 15 m by electrolysis in aqueous solution, slightly acidified to greatly increase the conductivity in solution.
  • the solution can contain 100 to 200 g / l of H 2 SO 4 and 1 to 10 g / l of AL 2 (SO 4 ) 3 . It consists in applying a continuous electrical voltage of 15 to 20 Volts between the strip and the pure aluminum cathodes.
  • the strip of aluminum alloy forms the anode.
  • the clogging step (unit 15) is carried out preferably in a tank 100m long and consists of dip anodized aluminum in boiling water to transform the oxide layer, i.e. the alumina into mono-hydrated alumina that swells and clogs pores possibly left open during the anodizing. Clogging gives the oxide layer particularly high resistance to acids as well that increased stability to atmospheric agents. Likewise, it allows better retention of a dye subsequently applied to the oxide layer.
  • the chromation step (unit 18) consists in depositing an amount of approximately 70 mg / dm 2 of the Bonderite 4508® product sold by Parker Benelux SA. The chromating operation is followed by hot air drying to fix the chemical conversion layer thus obtained on one of the faces of the aluminum alloy ribbon.
  • the step of applying a layer of painting can be done in single or double face, i.e. on both sides of the alloy ribbon aluminum. So a coat of paint can be applied to both the anode layer and the chromate layer of the ribbon. Furthermore, in order to harden the layer of paint, we apply a cooking step in an oven with infrared radiation (unit 21).
  • the final step is to put a strip of temporary plastic covering type 4223®, marketed by Novacell S.A., to protect the face anodized and / or the converted side against damage during post-processing, such as cutting in length, the leveling etc.
  • the installation of the invention includes everything first an input section which consists of supplying the aluminum alloy tape from a spool to the surface treatment section.
  • This entry section includes a set of sequences (1) which advantageously consists of two unwinders and introduction tables to unroll the aluminum alloy ribbon coil; a shears trimming (2) to prepare the start and end of bands; a attachment system (3) to ensure continuity of the aluminum alloy tape to be treated and which consists of stapling, gluing or welding the alloy strips successive aluminum; a system for regulating the traction (4) of the entry section comprising preferably a measurement and traction gauge and motorized rollers called S-blocks; a system of continuous storage (5) of the tape preferably in the form an accumulator, a water or loop pit; and one tape centering and regulation system (6) traction advantageously comprising a gauge for measuring traction and an S-block before entering the section surface treatment.
  • the installation of the invention comprises then a surface treatment section with successively degreasing, pickling, neutralization, intermediate rinsing and drying, anodizing and finishing treatments.
  • rinsing devices (8, 12, 14) are fitted with upstream drain rollers and downstream of each rinsing device to act barrier between the different solutions used for the preparation, the treatment of the metal surface and rinse water
  • the installation of the invention comprises also an exit section after the section of surface treatment.
  • the output section consists usually a tape centering system (22) and traction control preferably comprising a traction gauge and an S-block; a system of continuous storage of the sheet (23) preferably under the shape of an accumulator, a water or loop pit; a traction control system (24) of the cross section output advantageously comprising a gauge for measuring traction and an S-block; a trimmer shears (25) for prepare the beginnings and ends of tapes, possibly a cover tape unwinder (26) comprising a station for laying a covering strip on the ribbon treated aluminum alloy and finally, a set winding (27), advantageously comprising a rewinder and introduction tables.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
EP98870116A 1998-05-20 1998-05-20 Gewickelter Aluminiumlegierungsband, Verfahren zur Herstellung und Anlage dafür Withdrawn EP0959152A1 (de)

Priority Applications (1)

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EP98870116A EP0959152A1 (de) 1998-05-20 1998-05-20 Gewickelter Aluminiumlegierungsband, Verfahren zur Herstellung und Anlage dafür

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Application Number Priority Date Filing Date Title
EP98870116A EP0959152A1 (de) 1998-05-20 1998-05-20 Gewickelter Aluminiumlegierungsband, Verfahren zur Herstellung und Anlage dafür

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628999A (en) * 1945-12-28 1949-09-08 Reynolds Metals Co Improvements in treatment of aluminium sheets
US4065364A (en) * 1976-01-21 1977-12-27 Fromson H A Process for anodizing aluminum
JPH07278888A (ja) * 1994-04-05 1995-10-24 Fuji Photo Film Co Ltd 帯状金属板の電解処理方法、平版印刷版支持体の製造方法及び感光性平版印刷版の製造方法
JPH09287080A (ja) * 1996-04-22 1997-11-04 Showa Alum Corp 反射板およびその製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB628999A (en) * 1945-12-28 1949-09-08 Reynolds Metals Co Improvements in treatment of aluminium sheets
US4065364A (en) * 1976-01-21 1977-12-27 Fromson H A Process for anodizing aluminum
JPH07278888A (ja) * 1994-04-05 1995-10-24 Fuji Photo Film Co Ltd 帯状金属板の電解処理方法、平版印刷版支持体の製造方法及び感光性平版印刷版の製造方法
JPH09287080A (ja) * 1996-04-22 1997-11-04 Showa Alum Corp 反射板およびその製造方法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 096, no. 002 29 February 1996 (1996-02-29) *
PATENT ABSTRACTS OF JAPAN vol. 098, no. 003 27 February 1998 (1998-02-27) *

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