Process for producing a profiled aluminum element with an adhesion promoter layer

Abstract

Method for producing a profiled aluminum element (10) for a metal-plastic composite component (12),- in which a strip (2) made of an aluminum alloy is provided by hot and / or cold rolling, the strip (2) having a longitudinal direction,- in which the strip (2) is subjected to a strip coating, an adhesion promoter layer (4) being applied to the strip (2) at least in sections or in strip form using the strip coating,- in which the strip (2) or a sheet cut off from the strip (2) is subjected to roll forming,- in which the roll forming produces a profile in the strip (2) or sheet in cross section relative to the longitudinal direction.

Description

[0001] The invention relates to a method for producing a profiled aluminum element for a metal-plastic composite component. Furthermore, the invention relates to a profiled aluminum element for a metal-plastic composite component, in particular produced using the method according to the invention, having a longitudinal direction, with a profile in a cross-section relative to the longitudinal direction, wherein an anchoring region and a connecting region are provided, and wherein at least the anchoring region has an adhesion promoter layer for connection to a plastic element. Furthermore, the invention relates to a joined metal structure comprising at least one profiled aluminum element according to the invention and a metal-plastic composite component having at least one aluminum layer and at least one plastic-containing layer.

[0002] Metal-plastic composite components are used in the automotive sector. Particularly in the design and manufacture of car bodies, various technical requirements and specifications must be met, which must be considered when selecting the materials for the body. For example, the design of an underbody area for a motor vehicle requires optimization in terms of noise development, drag coefficient, stability, and crash behavior. Furthermore, the materials and components used should be as lightweight as possible in order to achieve, for example, optimized fuel consumption. Metal or aluminum-plastic composite components can be used as lightweight elements, replacing heavier steel modules, for example.

[0003] For example, for the underbody areas of motor vehicles, panels are used which consist of a simple one-piece construction made of polypropylene with glass fibre filling in order to achieve good sound insulation and an improved drag coefficient c w To achieve this, long-fiber reinforced thermoplastics (LFT), glass mat reinforced thermoplastics (GMT), or low-weight reinforced thermoplastics (LWRT) materials are used in particular.

[0004] EP 2 965 902 A1 describes a multilayer structural component with a layered structure comprising fiber material with a thermoplastic binder and at least one aluminum layer. A connecting element with an anchoring region arranged between the layers of the layered structure and a connecting region for connecting to another component are provided. The connecting element can be an extruded aluminum profile. Such connecting elements may require an adhesion promoter layer intended to increase the adhesion between the connecting element and the surrounding plastic or fiber layers.

[0005] When manufacturing a connecting element for an aluminum-plastic composite component via extrusion or extrusion, the connecting element is formed during production and produced directly as an aluminum profile with a predefined profile in a cross-section along a longitudinal direction. The extruded aluminum profiles are typically cut to a specified length and then individually treated to apply an adhesion promoter layer. This means that individual connecting elements are pretreated and coated, for example, in a dip treatment followed by powder coating or wet painting.

[0006] Extrusion is a comparatively cost-effective process for producing aluminum profiles, as the profiling is achieved directly during production. However, for applications in metal-plastic composite components, the treatment typically required is rather complex, as the profiles must be individually processed for pretreatment and coating or painting. Furthermore, the design of the aluminum profiles is subject to certain limitations due to the requirements of extrusion, for example, with regard to the choice of alloy and the achievable minimum wall thickness.

[0007] DE 10 2016 012 691 A1 discloses a multi-layer structural component and a method for its production and a use of the multi-layer structural component.

[0008] From DE 10 2017 216 201 A1 a method and a device for directly joining a fiber-reinforced plastic part and a metal part is known.

[0009] Based on this, the present invention is based on the object of providing a method for producing a profiled aluminum element for a metal-plastic composite component, which mitigates the aforementioned disadvantages of the prior art and, in particular, enables simpler large-scale production. A profiled aluminum element for a metal-plastic composite component, a joined metal structure, and a metal-plastic composite component are also proposed to achieve this object.

[0010] According to a first teaching, the object is achieved with respect to a method for producing a profiled aluminum element for a metal-plastic composite component, in which a strip made of an aluminum alloy is provided by hot and / or cold rolling, the strip having a longitudinal direction, in which the strip is subjected to a strip coating, an adhesion promoter layer being applied to the strip at least in sections using the strip coating, in which the strip and / or a sheet cut off from the strip is subjected to roll forming, the roll forming producing a profile in cross section relative to the longitudinal direction in the strip and / or sheet.

[0011] Producing aluminum alloy strips by hot and / or cold rolling is particularly cost-effective. For example, a direct chill process is provided, whereby a rolled ingot is cast from an aluminum alloy. The rolled ingot can optionally be homogenized and / or milled. The rolled ingot can then be further processed by hot and / or cold rolling into a strip with the intended final thickness, where the final thickness corresponds, for example, to the intended (wall) thickness of the profiled aluminum element. The rolling steps can optionally include intermediate annealing, in particular between several cold rolling passes. Trimming and / or dividing the rolled strip can also be performed.

[0012] As an alternative to a direct chill process, a strip casting or continuous casting process can be used, with which the aluminum alloy is directly formed into a strip shape before hot and / or cold rolling is carried out.

[0013] Production via hot and / or cold rolling not only creates a characteristic microstructure that is advantageous with regard to mechanical properties, but also causes the strip to expand in a longitudinal direction. The present invention has recognized that a coil coating or coil coating process can be used to apply an adhesion promoter layer that is advantageous for use in a metal-plastic composite component in a particularly economical manner. For example, the coating is carried out on a moving strip in the longitudinal direction, whereby the coating can be applied essentially over the entire length of a strip in a single step and optionally on one or both sides across the entire width of the strip. Coil coating can be carried out at very high production speeds while simultaneously achieving high coating quality and high adhesion.This eliminates the need for complex piece-by-piece treatment of individual aluminum profiles. The strip can be coated (if necessary in a single step) on one or both sides, in sections (strips) or across the entire width.

[0014] The strip can be subjected to roll forming, preferably after the strip coating process. Roll forming, in particular, involves the use of bending means such as forming rolls. The strip passes through the bending means to obtain a profile in a cross-section relative to the longitudinal direction. Roll forming can also be carried out at comparatively high throughput speeds, with a profile being created in a single step essentially along the entire length of the strip.

[0015] In addition, roll forming is flexibly adjustable with regard to the profile to be produced, since, for example, bending elements such as forming rolls can be designed to be adjustable. Accordingly, different profiles can be achieved with the same roll forming device. Coil coating can be easily performed on the flat, undeformed strip, and the coating already present during the forming process creates a uniform bonding layer in the profiled strip, largely independent of the profile produced.

[0016] Roll forming can be performed directly on the rolled strip, essentially along its full width and / or full length. Roll forming can also be performed on a strip that has been cut lengthwise. For example, at least one strip divider is provided, through which the strip passes. This divides the strip lengthwise into several strips of smaller width. Accordingly, several profiled strips can be provided simultaneously, especially with different profiles.

[0017] However, it is also conceivable that sheets are cut from the strip and then subjected to roll forming. For example, the sheets are cut directly to the dimensions intended for later use. The design of further process steps according to the following description can also, in principle, be carried out on sheets cut from the strip.

[0018] As a result, the process according to the invention significantly simplifies the production of coated and profiled aluminum elements for metal-plastic composite components, particularly compared to extruded aluminum profiles. Piece-by-piece treatment is eliminated, as the coating and optionally also a pretreatment are already provided economically with a strip treatment.

[0019] In one embodiment of the process, the coil coating is carried out using a rinse process or, preferably, a no-rinse process, in particular using a roll coater as described above. No-rinse processes can be very economical and, in addition to saving on rinsing fluid, also result in a saving on the coating material to be applied.

[0020] In a further embodiment of the process, the coil coating is carried out using a roll coater. At least one application roller can be provided, which, for example, applies the adhesion promoter layer material from a bath. Additional coating rollers can also be provided, such as transfer rollers and pick-up rollers. Roll coaters can be provided on one or both sides.

[0021] In a strip coating system, in particular with a roll coater, coatings with a mass coverage of 1 g / m 2 up to 50 g / m 2 , especially 2 g / m 2 up to 15 g / m 2 for the adhesion promoter layer. Other preferred ranges for mass coverage are 2 to 30 g / m 2 , 5 to 10g / m 2 and 6 to 8 g / m 2The lower limit ensures reliable adhesion to the plastic layers of the composite component and, if necessary, surface protection (e.g., corrosion protection) of the aluminum element. The upper limits can be used, for example, to save material.

[0022] The thickness of the adhesion promoter layer can range from 1 µm to 50 µm, for example, and in particular from 5 µm to 15 µm. Here, too, the lower limit can ensure reliable adhesion to the plastic layers of the composite component and, if necessary, surface protection of the aluminum element. The maximum layer thickness can be considered to save material.

[0023] The adhesion promoter layer can be applied as a primer and / or adhesive varnish. According to one embodiment of the method, the adhesion promoter layer can be based on a thermoplastic material. Thermoplastic material can, for example, provide a particularly stable bond between the aluminum element and a plastic element by softening or melting. Examples of adhesion to thermoplastic materials include polypropylenes (PP), polyamides (PA), polyethylenes (PE) such as polyethylene terephthalate (PET), polystyrene (PS), and polycarbonates (PC), which can also be provided as a combination. Likewise, the adhesion promoter layer can be based on a thermosetting plastic or comprise thermosetting plastics, in particular at least one epoxy resin and / or polyester resin.

[0024] In a further embodiment of the method according to the first teaching, the profile is formed by roll forming as a half-shell profile, hollow profile, or multi-chamber profile. Such profiles allow for good connection to plastic elements of a composite component. Half-shell, hollow, or multi-chamber profiles can also be used to accommodate cables in the resulting cavities or chambers, which is advantageous, for example, for applications in the automotive sector.

[0025] In particular, profiled aluminum elements can be joined to form a closed hollow profile or multi-chamber profile, for example, by thermal joining such as welding or soldering. Joining is also possible via adhesive bonding and / or a form-fitting process, such as flanging. Joining can also be performed on the strip, for example, during or after roll forming, allowing closed profiles to be produced particularly cost-effectively.

[0026] In a further embodiment of the method according to the first teaching, the strip is coated with the strip coating in strips. For example, a coating is applied in strips in the longitudinal direction, so that areas with different coatings or even bare areas (uncoated areas or areas without an adhesion promoter layer) are created in the profile. It is conceivable that parts of the strip are masked and then the strip coating is carried out, so that masked areas initially receive no coating. However, coil coating processes can also allow a strip-shaped coating to be carried out without masking. For example, roll coaters can be used whose contact width is smaller than the width of the strip to be coated, whereby only individual areas of the strip are coated in the longitudinal direction.

[0027] The strip-shaped coating allows for a particularly versatile design of the profiled aluminum element. For example, an anchoring area can be coated with an adhesion promoter layer, while a connecting area can be uncoated or treated with decorative paints and / or corrosion protection. Using a strip-shaped coating, such a strip-shaped coating can be applied particularly easily and cost-effectively in a single pass of a strip.

[0028] According to a further embodiment of the method, a strip pretreatment is carried out on the strip, in particular a (separate) strip pretreatment prior to the strip coating and / or a strip pretreatment carried out during the strip coating and the application of the adhesion promoter layer. In particular, a strip pretreatment can be carried out for corrosion protection, for conditioning the strip surface, and / or for cleaning the strip surface.

[0029] In principle, it is conceivable for a strip coating to be carried out on a strip that is still greased or has not been pretreated. However, this usually involves residues such as rolling oil and particles remaining from the rolling process, such as abrasion, on the surface of the strip. Likewise, the oxide layer on the surface can be such that it is adversely affected by the rolling process that the strip coating is adversely affected.

[0030] Degreasing can be used to remove, for example, residues from rolling emulsions from the surface of the rolled strip and prepare it for strip coating. Degreasing can be performed chemically, mechanically, and / or thermally. However, thermal degreasing with a heat treatment to convert it to a degreased state can transform the microstructure of the aluminum alloy strip into an undesirable state, such as a softened state.

[0031] Chemical treatment during strip pretreatment can avoid the disadvantages of thermal treatment and prepare the surface for strip coating. Degreasing is achieved, for example, using an alkaline and / or acidic degreasing solution. In addition to removing residues from the strip surface, the oxide layer can also be removed. In an optional pickling step, for example, a thin layer of the strip surface is removed. Pickling can be performed after degreasing, with or during degreasing, or independently of degreasing.

[0032] Anodizing the strip creates a surface that is more resistant to mechanical properties and corrosion, which can also enable a particularly durable and uniform strip coating. Anodizing can be used, in particular, to create an anodized layer with a thickness of 50 nm to 150 nm and is carried out, for example, using hot AC thin-film anodizing. Chemical pretreatment (e.g., degreasing and / or pickling), heat treatment, and / or anodizing are performed inline with the strip coating process.

[0033] In a further embodiment of the method according to the first teaching, the strip is coated with a pretreatment layer. For example, this is a corrosion protection layer or a conversion layer, which improves the durability of the produced aluminum elements. Furthermore, a pretreatment layer such as a conversion layer can improve the adhesion of the adhesion promoter layer. The pretreatment layer is also applied, for example, with a strip coating and / or strip pretreatment, and in particular before the adhesion promoter layer. It is also conceivable that additional functional coatings are provided.

[0034] Furthermore, a pretreatment layer containing Ti / Zr complexes can be applied. For example, complex Ti and / or Zi fluorides are provided. The pretreatment layer can be chromium-free, thus avoiding the environmental disadvantages of chromium compounds during processing and disposal of the aluminum elements.

[0035] In one embodiment, the strip has a thickness of 50 µm to 5 mm, in particular 100 µm to 500 µm, which is particularly suitable, for example, for the mechanical and weight-specific requirements in automotive construction and bodywork technology. The thickness of the strip results in corresponding (i.e., essentially identical) wall thicknesses or material thicknesses of the manufactured aluminum element.

[0036] With strip coating, and in particular roll forming of a strip, even lower thicknesses of the aluminum element can be achieved, which are less suitable for extrusion or cannot be achieved via extrusion. For example, a thickness of 100 µm to 1000 µm can easily be achieved by production from a hot- or cold-rolled strip. Preferred additional thicknesses can be 100 µm to 500 µm or 100 µm to 300 µm.

[0037] Supplying the material as strip and roll forming also offers the possibility of selecting aluminum alloys that are less suitable for extrusion, as well as using high-strength aluminum alloys. These alloys can be produced, for example, using a direct chill process. Various aluminum alloys are conceivable, particularly AA 3xxx, AA 5xxx (e.g., AA 5083), and AA 6xxx alloys.

[0038] According to a second teaching, the above-mentioned object is achieved by a profiled aluminum element for a metal-plastic composite component in that the aluminum element has a hot-rolled and / or cold-rolled structure.

[0039] The anchoring area of the aluminum element is preferably flat, for example, in the shape of a sheet or tab, so that the anchoring area can be embedded flat between two layers of a plastic layered structure. Such a flat anchoring area can be easily provided from a strip and has a large surface area for connection to plastic elements. A flat design of the anchoring area can also maintain the basic layered structure of a plastic layered structure.

[0040] The connection area of the aluminum element can, for example, have connecting means corresponding to another component, such as corresponding holes for screw or rivet connections or corresponding flanges for a soldered or welded connection.

[0041] Through hot and / or cold rolling, a specific microstructure is created in the aluminum element, which structurally differs, for example, from the microstructure of an extruded aluminum profile. In addition to the simplified production of the aluminum element presented in connection with the method according to the first teaching, a hot-rolled and / or cold-rolled microstructure can also exhibit advantageous mechanical properties compared to extruded aluminum profiles, which can be utilized for metal-plastic components with the invention.

[0042] In a next embodiment according to the second teaching, the profiled aluminum element is coated in strips in the longitudinal direction, with the anchoring area having a strip-shaped adhesion promoter layer. For example, only the anchoring area is coated, and the remaining areas, and in particular the connection area, are bare or have another coating, such as a conversion layer, a corrosion protection layer, a KTL replacement system, and / or decorative coatings. Corresponding strips can be provided in the longitudinal direction, which can be achieved, for example, by section-by-section coil coating, whereby, among other things, at least one decorative coating and / or at least one bare strip are possible.

[0043] According to a third teaching, to achieve the above-mentioned object, a joined metal construction is also specified, which has at least one profiled aluminum element according to the second teaching and at least one further metal element. The profiled aluminum element is connected to the further metal element by joining, for example by thermal joining such as welding or soldering. Joining via gluing and / or a form fit, for example flanging, is also possible. Using a joined metal construction, it is possible to connect the advantageous aluminum element according to the second teaching to further functional metal elements and to incorporate these into a metal-plastic composite component. The further metal element can be an element made of an aluminum alloy.In particular, it is also a roll-formed aluminum element, for example according to the second teaching, and / or metal elements made of steel or steel alloys. The joined metal structure can be designed in particular for vehicle construction.

[0044] The above-mentioned object is also achieved according to a fourth teaching of the invention by a metal-plastic composite component in that the at least one aluminum layer is at least partially formed by a profiled aluminum element according to the second teaching, wherein the adhesion promoter layer of the coated aluminum element is bonded to the at least one plastic-containing layer. The adhesion promoter layer is bonded to the plastic-containing layer in particular by a material bond, for example, by softening, fusing, and / or gluing.

[0045] In particular, the plastic-containing layer comprises a fiber-reinforced plastic. Fibers used for reinforcement can include, in particular, glass fibers, carbon fibers, aramid fibers, ceramic fibers, and / or quartz fibers. In particular, the metal-plastic composite component is provided with long-fiber-reinforced thermoplastics (LFT), glass mat-reinforced thermoplastics (GMT), or low-weight reinforced thermoplastics (LWRT).

[0046] The layered structure can comprise a plurality of layers arranged one above the other in a stacking direction, wherein the layered structure comprises at least one fiber layer made of a fiber material and a (e.g., thermoplastic) binder, and at least one aluminum layer. The layered structure can, in principle, comprise any number of layers arranged one above the other. Preferably, however, the layered structure comprises at least two fiber layers and at least two aluminum layers. The layered structure preferably has a symmetrical structure in the stacking direction, in particular with two centrally arranged, adjacent fiber layers, between which the anchoring region is embedded.

[0047] The metal-plastic composite component can be manufactured by hot-pressing. The layers of the layered structure and the connecting element can be arranged one above the other in a mold in the stacking direction such that the anchoring region of the connecting element is embedded between two layers of the layered structure adjacent in the stacking direction, in particular between two fiber layers, and in which the layers and the aluminum element are hot-pressed together at least in the anchoring region.

[0048] Hot pressing means that the layers of the layered structure are heated before or during pressing in such a way that a thermoplastic binder of the fiber layers and / or the adhesion promoter layer softens.

[0049] The metal-plastic composite component can be designed in particular as a body component or body attachment of a vehicle, in particular an automobile.

[0050] The exemplary embodiments of the present invention previously presented in this description are also to be understood as disclosed in all combinations with one another. In particular, exemplary embodiments are to be understood as disclosed in relation to the various teachings. In particular, the preceding or following description of method steps according to preferred embodiments of a method is also intended to disclose corresponding means for carrying out the method steps using preferred embodiments of a device.

[0051] Further developments and advantages of the invention can be found in the following detailed description of some exemplary embodiments of the present invention, particularly in conjunction with the drawing. The drawing shows in Fig. 1a-d are schematic representations of a first embodiment of the method according to the first teaching, a profiled aluminum element according to the second teaching and a metal-plastic composite component according to the fourth teaching, Fig. 2a-d a schematic representation of a second embodiment, Fig. 3a-b a schematic representation of a third embodiment with a joined metal construction according to the third teaching and Fig. 4 a further embodiment of a joined metal construction according to the third teaching.

[0052] Fig. 1a-d show schematic representations of a first embodiment of the method according to the first teaching.

[0053] In Fig. Figure 1a initially shows a schematic cross-section of a strip 2 transverse to a longitudinal direction. The strip 2 is produced from an aluminum alloy by hot and / or cold rolling, resulting in a microstructure in the strip 2 that is characteristic of a rolling process. For example, in the direct chill process, a rolling ingot made of an aluminum alloy is cast, homogenized, and further processed into a strip 2 by hot and / or cold rolling.

[0054] Strip 2 can be used as-rolled or with a heat treatment to adjust the microstructure. In the next step, the strip is pretreated (degreased and applied with a conversion coating). The pretreatment layer contains Ti / Zr complexes (especially Ti and / or Zr fluorides as a complex) and is chromium-free.

[0055] The strip 2 is subjected to a strip coating, as in Fig. 1b shows a bonding layer 4 being applied to the strip 2. The bonding layer 4 can be applied to one side or, as shown here, to both sides. The strip coating is carried out using a coil coating process, with the bonding layer 4 being applied using a roll coater. The bonding layer 4 is applied with a mass coverage of 1 g / m 2 up to 50 g / m 2 applied.

[0056] The adhesion promoter layer 4 is based on polymer materials, in particular thermoplastics such as PP, PA, PET, and / or PE. Alternatively, thermosets, such as epoxy resins and / or polyester resins, can also be used for the adhesion promoter layer 4.

[0057] The strip 2 is subjected to roll forming, for example, by passing the strip 2 through forming rolls. Thus, the roll forming process creates a profile in the strip 2 in the cross-section relative to the longitudinal direction, see. Fig. 1c. In particular, the shape of the profile defines an anchoring region 6 and a connection region 8, wherein the adhesion promoter layer 4 is also provided in the anchoring region 6, so that the anchoring region 6 can be connected to a plastic element.

[0058] Accordingly, a profiled aluminum element 10 is formed for a metal-plastic composite component, wherein the aluminum element 10 has a hot-rolled and / or cold-rolled structure via the profiled strip 2. The profiled aluminum element 10 can have a thickness or wall thickness of 100 µm to 5 mm, which is based on the thickness of the rolled strip 2.

[0059] The method according to the invention significantly simplifies the production of coated and profiled aluminum elements 10 for metal-plastic composite components, particularly in comparison to extruded aluminum profiles, wherein, for example, piece treatment can be omitted due to the strip coating with the adhesion promoter layer 4 and the pretreatment on the strip 2.

[0060] The profiled aluminum element 10 can be Fig. 1d shown in a metal-plastic composite component 12. For this purpose, the profiled aluminum element 10 is connected to a plastic element 14. The plastic element 14 has a plurality of plastic-containing layers 16, which are reinforced by fiber layers 18 (for example, glass and / or carbon fibers). The anchoring region 6 of the profiled aluminum element 10 provides an aluminum layer that can be embedded in the plastic-containing layers 16. In this case, the adhesion promoter layer 4 of the profiled aluminum element 10 is connected to the plastic-containing layers 16, in particular by softening or melting the adhesion promoter layer 4 and / or the plastic-containing layers 16, thereby creating a material bond. The metal-plastic composite component 12 is designed, for example, as a composite with LFT, GMT, or LWRT materials.

[0061] Fig. 2a-d shows a schematic representation of a second embodiment, wherein the numbering of the reference numerals has been retained for corresponding elements. In Fig. 2a shows a band 2, which as above is Fig. 1a is provided.

[0062] In Fig. 2b shows the strip 2 after being coated with a bonding agent layer 4, although the strip 2 is coated with the bonding agent layer in strips. The bonding agent layer 4 is thus only applied in certain areas, which is achieved in particular using a roll coater. Furthermore, strips in the longitudinal direction with at least one decorative coating (not shown) and / or bare strips can be provided.

[0063] A profile is introduced using a roll forming process, which, as in Fig. 2c, a profiled aluminum element 10 is produced. Due to the strip-shaped coating, essentially only the anchoring region 6 is coated with the adhesion promoter layer 4. The connection region 8, for example, has no further coating or a different coating (such as a decorative coating).

[0064] As in Fig. As shown in Fig. 2d, the profiled aluminum element 10 can be connected to a plastic element 14 via the anchoring area 6 provided with the adhesion promoter layer 4, wherein an aluminum layer is embedded in plastic-containing layers 16 with fiber layers 18.

[0065] The adhesion promoter layer 4 can be applied particularly economically in specific areas using a strip-shaped tape coating, for example, using roll coaters that are only in contact with the tape 2 in specific areas across the width. Masking is not absolutely necessary for the area-by-area coating.

[0066] Fig. 3a-b shows a schematic representation of a third embodiment with a joined metal construction according to the third teaching. Starting from the Fig. 2c, which is designed as a half-shell profile, the profiled aluminum element 10 is joined to another metal element 20, for example, welded to the formed strip 2. This creates, as in Fig. 3a shows a joined metal structure designed as a hollow profile. The additional metal element 20 is, for example, also a profiled aluminum element according to the second teaching or an uncoated profiled aluminum element, which was also produced by roll forming a hot- and / or cold-rolled strip.

[0067] Fig. 3b further shows the use of the joined metal construction from Fig. 3a in a metal-plastic composite component similar to the embodiments of Fig. 1d and Fig. 2d.

[0068] Fig.Figure 4 shows a perspective view of another embodiment of a joined metal structure 22 according to the third teaching. Here, two roll-formed and coated aluminum elements 10 are welded to a metal element 20. The roll-formed aluminum elements 10 can be further joined to plastic elements (not shown), for example, to produce a body component of a vehicle.

[0069] Tests were also conducted to test the quality and adhesion of the bond between coil-coated aluminum elements with a primer layer and thermoplastic components. Adhesive layers with mass coverages of 2 to 30 g / m² were applied to several aluminum elements with a thickness of approximately 0.4 mm. 2 , 5 to 10g / m 2 and 6 to 8 g / m 2applied. Epoxy resin-based adhesive coatings (designation 008Y198 for bonding to PP) and polyester resin (designation 008Y765 for bonding to PET) were used as adhesion promoter layers. With the various mass coatings and both adhesive coating systems, adhesion values of more than 3 N / mm were achieved when sealed to the thermoplastics.

Claims

[1] Method for producing a profiled aluminum element (10) for a metal-plastic composite component (12), - in which a strip (2) made of an aluminium alloy is provided by hot and / or cold rolling, the strip (2) having a longitudinal direction, - in which the strip (2) is subjected to a strip coating, wherein an adhesion promoter layer (4) is applied to the strip (2) at least in sections or in strip form, - in which the strip (2) or a sheet cut from the strip (2) is subjected to roll forming, - whereby the roll forming produces a profile in the cross-section to the longitudinal direction in the strip (2) or sheet. [2] Method according to claim 1, characterized by that the coil coating is carried out with a roll coater. [3] Method according to claim 1 or 2, characterized by , that - an adhesion promoter layer (4) based on thermoplastic material, in particular PP, PA, PE, PET, PS, PC, is applied; and / or - an adhesion promoter layer (4) based on thermosetting plastic, in particular at least one epoxy resin and / or polyester resin, is applied. [4] Method according to one of the preceding claims, characterized by , that - the profile is formed by roll forming as a half-shell profile, hollow profile or multi-chamber profile and in particular is joined to form a closed hollow profile or multi-chamber profile. [5] Method according to one of the preceding claims, characterized by , that - a belt pre-treatment of the belt (2) is carried out. [6] Method according to claim 5, characterized by , that - the strip pretreatment comprises a chemical treatment, in particular degreasing, pickling and / or rinsing; - the strip pretreatment comprises anodisation, in particular by means of hot AC thin-film anodisation; and / or - the strip pretreatment includes heat treatment. [7] Method according to one of the preceding claims, characterized by , that - the strip (2) is additionally coated with at least one pretreatment layer, in particular comprising at least one corrosion protection layer. [8] Method according to claim 7, characterized by , that - at least one pretreatment layer comprising Ti / Zr complexes and in particular at least one chromium-free pretreatment layer is applied. [9] Method according to one of the preceding claims, characterized by , that - the adhesion promoter layer (4) has a layer thickness of 1 µm to 50 µm, in particular a layer thickness of 5 µm to 15 µm. [10] Method according to one of the preceding claims, characterized by , that - the strip (2) has a thickness of 50 µm to 5 mm, in particular a thickness of 100 µm to 500 µm. [11] Method according to one of the preceding claims, characterized by , that - the strip (2) is based on an aluminium alloy of type AA 3xxx, AA 5xxx, AA 5083 or AA 6xxx. [12] Profiled aluminum element (10) for a metal-plastic composite component (12), in particular produced by a method according to one of the preceding claims, - with a longitudinal direction, - with a profile in a cross-section to the longitudinal direction, - wherein an anchoring area (6) and a connection area (8) are provided, - wherein at least the anchoring region (6) has an adhesion promoter layer (4) for connection to a plastic element (14), characterized by , that - the profiled aluminium element (10) has a hot-rolled and / or cold-rolled structure, - wherein the profiled aluminum element (10) is coated in strips in the longitudinal direction, wherein the anchoring region (6) has a strip-shaped adhesion promoter layer (4). [13] Profiled aluminum element (10) according to claim 12, characterized by , that - longitudinal stripes with at least one decorative coating and / or bare stripes are provided. [14] Joined metal construction (22), - comprising at least one profiled aluminum element (10) according to one of claims 12 or 13 and at least one further metal element (20, 24), - wherein the profiled aluminum element (10) is connected to the further metal element (20, 24) by joining. [15] Metal-plastic composite component (12), - with at least one aluminium layer and at least one plastic-containing layer (16), characterized by , that - the at least one aluminum layer is at least partially formed by a profiled aluminum element (10) according to one of claims 12 or 13, - wherein the adhesion promoter layer (4) of the profiled aluminum element (10) is connected to the at least one plastic-containing layer (16).

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