EP2292338B1 - Procédé de revêtement - Google Patents

Procédé de revêtement Download PDF

Info

Publication number
EP2292338B1
EP2292338B1 EP20100008791 EP10008791A EP2292338B1 EP 2292338 B1 EP2292338 B1 EP 2292338B1 EP 20100008791 EP20100008791 EP 20100008791 EP 10008791 A EP10008791 A EP 10008791A EP 2292338 B1 EP2292338 B1 EP 2292338B1
Authority
EP
European Patent Office
Prior art keywords
coating
component
functional surface
mask
powder
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.)
Not-in-force
Application number
EP20100008791
Other languages
German (de)
English (en)
Other versions
EP2292338A1 (fr
Inventor
Stefan Hendel
Martin Koyro
Ullrich Hammelmaier
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.)
Benteler Automobiltechnik GmbH
Original Assignee
Benteler Automobiltechnik 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.)
Filing date
Publication date
Application filed by Benteler Automobiltechnik GmbH filed Critical Benteler Automobiltechnik GmbH
Publication of EP2292338A1 publication Critical patent/EP2292338A1/fr
Application granted granted Critical
Publication of EP2292338B1 publication Critical patent/EP2292338B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/06—Applying particulate materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/32—Processes for applying liquids or other fluent materials using means for protecting parts of a surface not to be coated, e.g. using stencils, resists
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/10—Phosphatation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified

Definitions

  • the invention relates to a coating method in which at the same time paint-free areas are to be ensured.
  • Coatings on surfaces to which fittings are attached are subject to special requirements. These requirements result from a setting behavior of the coating, which can lead to an unwanted loss of clamping force of the screw.
  • the requirements for these functional surfaces vary, with the basic aim being to keep the functional surfaces free of lacquer. At the same time, however, it must be ensured with metallic components that unpainted functional surfaces remain corrosion-free. This freedom from corrosion must be ensured at least temporarily until a further assembly in which the functional surface is covered.
  • a stabilizer of a motor vehicle it is state of the art to perform a pretreatment of the surface of the component.
  • the component is cleaned and then provided with an iron or Zinkphosphat ist to the corrosion protection and the paint adhesion of the following Increase powder coating.
  • the covers are removed and the ends dipped in a wet paint, which ensures a thinner and more uniform layer thickness on the mounting surface.
  • a thin lacquer layer for example, with a layer thickness of only 20 microns in the area of the mounting surface can be realized. Nevertheless, the mounting surface is not free of paint.
  • the mounting surface itself is to be free of paint, it is possible to provide only the mounting surfaces of the stabilizer after cleaning with Ronde-shaped stickers. These stickers remain on the component until further assembly.
  • two additional steps are necessary, namely the application and detachment of the stickers. Since the stickers are applied before the phosphating and are removed only immediately before further assembly, they allow a temporary corrosion protection until further assembly. Nevertheless, the effort to precisely apply and remove the sticker is relatively high.
  • WO 2005/018832 A1 discloses a method and apparatus for applying a grounded powder coating to a coating material.
  • the application of the powder coating takes place in several steps, so that the coating material passes through several stations until the end of the process. Before that, a liquid layer can be applied and dried. Thereafter, the powder coating, wherein a rotating mask is used, under which the coating material is passed with the dried layer.
  • Body which are provided in a continuous flow by means of powder coating and then cooled to cover in defined areas touching or non-contact.
  • the non-contact cover has the advantage that the body can be rotated during the coating. A rotation of the body to be coated may be required if a particularly uniform layer thickness distribution is required.
  • DE 101 34 574 A1 includes a method of applying a paint to a prior art sheet in which a surface of a vehicle body is covered without contact or closely adjacent via a mask, wherein the mask and the paint are electrically charged with a current of the same polarity during the application of the paint so that color or similar substances are prevented from advancing the color into the masked areas.
  • the prior art is also the DE 103 43 946 A1 to name a process for partitional surface treatment and similar components.
  • the opposing caps can be coupled to each other, for example, by a component passing through the hole and thus fixed in position.
  • a coating method is known in which a component to be coated is first provided with a liquid applied coating and then with a powder coating layer.
  • the powder coating layer should be applied in different thicknesses.
  • the liquid coating is first applied and dried at a distance from a mask, which provides for different thickness powder coating areas. It is a continuous process for coating strip material, so that the masking process is arranged at a greater distance to the application point of the liquid coating, since the coating must be dried before entering the masking.
  • the DE 198 14 632 C1 includes a method and apparatus for applying a protective layer to an elongated body, particularly wire or tube, in the art.
  • the pipes are partially covered without contact. After coating and before curing, the cover is removed and returned to the point of application.
  • the cover elements are preferably U-shaped caps, which can be arranged at a certain distance from the surface, which has the advantage that the Body can be rotated during the coating to achieve a particularly uniform coating thickness distribution.
  • the invention is based on the object to show a coating method in which both the lack of paint certain functional surfaces and their temporary corrosion protection is guaranteed until further assembly.
  • the component to be coated is first provided with a liquid applied coating and then provided in a known manner with a powder coating layer, i. powder coated.
  • a powder coating layer i. powder coated.
  • At least one functional surface is provided on the component, which should either be completely powder-coating-free or at least should have a smaller layer thickness of the powder coating. This is achieved in the context of the invention in that a masking is used.
  • the masking is not directly on the functional surface, but is located at a distance from the functional area. It creates a laterally open gap under the masking.
  • the distance between the functional surface and the masking is chosen so that the masking can be applied even before the application of the liquid coating, wherein the liquid applied coating passes between the masking and the functional surface.
  • the masking is applied at a distance of 0.5 mm to 20 mm from the functional surface. As a result, the corrosion-inhibiting properties of the liquid coating are achieved both in the masked and in the unmasked areas.
  • the subsequent powder coating can be carried out without the mask having to be moved closer to the functional surface, since the powder is not or only insubstantially penetrated by the powder coating process
  • the gap between the mask and the functional surface that is open on the circumference passes.
  • the method according to the invention it is possible to provide a component whose at least one functional surface, in particular a screw-on surface, is provided with a corrosion protection, the component having a smaller layer thickness of the applied coatings in the area of the functional surface than the regions arranged outside the masking. The temporary corrosion protection until further assembly is guaranteed.
  • the exact distance between the masking and the functional surface depends not only on the diameter of the circular masking, for example, but also on whether it is desired to introduce small amounts of powder coating into the gap between the masking and the functional surface.
  • powder coating can penetrate into the gap with increasing gap width.
  • the gap width should not be less than a minimum so that the liquid applied coating can still reliably reach the gap and wet the functional surface.
  • the distance of the masking to the functional surface is between 1 mm and 4 mm.
  • Decisive is the distance at the edge of the gap, i. at its mouth.
  • the gap width inside the gap may vary.
  • Conversion layers form as a result of a chemical transformation of the metal surface of the workpiece with an aqueous reaction solution which can be applied by dipping or by spraying.
  • Possible conversion layers can be applied by the process of phosphating, chromating, anodising or burnishing.
  • phosphating is suitable for creating a primer with good corrosion protection.
  • phosphating serves to improve wear protection.
  • the phosphating can in particular at Steel are used, but also in aluminum and aluminum alloys and magnesium and magnesium alloys. In the present application, the phosphating serves primarily as a primer for the subsequent powder coating.
  • the powder coating using the masking causes the powder coating to deposit only on areas that are not masked.
  • the masking ensures on the one hand by a mechanical shield that the powder coating does not accumulate in the area of the functional surface.
  • an electrostatic shield based on the principle of a Faraday cage, assuming that electrically conductive masking is used.
  • electric field lines are generated between a powder spraying device and the component to be coated.
  • the powder coating particles move primarily along these field lines. If the mask is electrically charged in the same polarity as the component to be coated, e.g. grounded, the masking also attracts powder particles. However, no field lines are formed between the component to be coated and the masking, so that the powder particles are deposited substantially only outside the gap on the functional surfaces.
  • powder coating can also be introduced into the gap and thus purposefully reduced powder coating layers can be formed on the functional surfaces.
  • a reduced powder coating layer is to be understood as meaning a powder coating layer whose layer thickness is smaller than the layer thickness of the powder coating layer in the unmasked regions.
  • the masks to be arranged at a distance from the functional surfaces are arranged on a suspension by means of which the component is held in particular in a clamping manner during the coating process.
  • a suspension can in particular pass through an opening of the component, especially since it is in the paint-free or substantially free of paint to be held functional surfaces to mounting surfaces that usually surround openings in the component.
  • the masking is used without such a suspension.
  • a mask can be arranged on both sides of the openings, wherein the two masks are connected to each other through the openings.
  • the mask is applied to the edge of the opening, not only is it ensured that powder can not enter the opening, but also that the bearing surfaces for screw connections, i. the edge immediately surrounding the opening, is designed as a paint-free functional surface.
  • the contact in the edge region of the opening also brings the masking to the same voltage potential as the component.
  • the advantages of the invention are seen in the fact that fewer process steps are necessary, in particular when integrating the masking in the suspension, which simplifies the entire coating process. At the same time, using the masking disposed away from the functional surface, it is possible to realize a preliminary phosphating or another corrosion protection in the area of the functional surface. The time-consuming masking of the paint-free areas is eliminated.
  • the method is applicable in continuous operation, in particular when the masking is integrated in a component holder.
  • FIG. 1 shows an end of a component to be coated 1.
  • the component 1 is a stabilizer.
  • the stabilizer should be fixed via a screw connection.
  • the following in the FIG. 2 Time-sequential manufacturing steps a) to e) illustrate how this goal is achieved.
  • FIG. 2a shows the component 1 in cross section.
  • the component 1 is cleaned and prepared for the subsequent production step, the application of a conversion layer.
  • a phosphating should be carried out.
  • two masks 4, 5 are applied.
  • the two masks 4, 5 are identical components which engage each other in the opening 2 opposite.
  • the masks 4, 5 are connected to each other in a manner not shown, for example screwed together.
  • the masks 4, 5 may also be in a manner not shown part of a pincer-like holder, wherein the masks 4, 5, so to speak, form the free ends of the pincer-like holder and are introduced in the ornamentation of the component 1 in the opening 2.
  • the masks 4, 5 are essentially formed by the circular disk-shaped regions which lie outside the opening 2.
  • FIG. 2b shows the masked and already phosphated component 1.
  • the opposing, frusto-conical spacers 6 are used to maintain a certain distance A from each to be protected Functional surface 3, to create a gap 7 between the respective functional surface 3 and the functional surface 3 facing side of the masking 4, 5.
  • the distance A or the width of the gap 7 is selected so that as little powder coating as possible can reach the region of the gap 7, ie the functional surface 3.
  • the Figure 2c shows the coating of the component 1 with the powder coating layer 9. It can be seen that the individual powder particles deposit in the unmasked areas of the component 1 in the desired manner. In addition, there is also a deposit on the outer surfaces of the masking 4, 5. However, there is no adhesion of powder coating in the gap 7 and thus not to an accumulation on the phosphated functional surface. 3
  • a component 1 is available in which the functional surfaces 3 are merely phosphated, but not powder-coated.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)

Claims (8)

  1. Procédé de revêtement, selon lequel une pièce à revêtir (1) est d'abord munie d'un revêtement appliqué sous forme liquide puis d'une couche de laque en poudre (9), au moins une surface fonctionnelle (3) étant prévue sur la pièce (1), laquelle surface fonctionnelle est exempte de laque en poudre ou comporte une couche de laque en poudre d'épaisseur réduite, un masque (4, 5) étant placé avant l'application du revêtement liquide à une distance (A) comprise entre 0,5 mm et 20 mm par rapport à la surface fonctionnelle (3) de telle sorte que le revêtement liquide arrive lors de l'application entre le masque (4, 5) et la surface fonctionnelle (3) et que la surface fonctionnelle (3) pendant l'application de la couche de laque en poudre (9) est complètement ou au moins majoritairement protégée par le masque (4, 5).
  2. Procédé de revêtement selon la revendication 1, caractérisé en ce que le masque (4, 5) est placé à une distance (A) comprise entre 1 mm et 4 mm par rapport à la surface fonctionnelle (3).
  3. Procédé de revêtement selon la revendication 1 ou 2, caractérisé en ce qu'une couche de conversion est appliquée comme revêtement appliqué sous forme liquide.
  4. Procédé de revêtement selon la revendication 3, caractérisé en ce que la pièce (1) est phosphatée.
  5. Procédé de revêtement selon l'une des revendications 1 à 4, caractérisé en ce que, pendant le procédé de revêtement, la pièce (1) est tenue au moyen d'une suspension sur laquelle le masque (4, 5) est agencé.
  6. Procédé de revêtement selon l'une des revendications 1 à 5, caractérisé en ce que le masque (4, 5) est placé au niveau d'une ouverture (2) dans la pièce (1), la surface fonctionnelle (3) entourant l'ouverture (2).
  7. Procédé de revêtement selon la revendication 6, caractérisé en ce qu'un masque (4, 5) est placé des deux côtés de l'ouverture (2), les deux masques (4, 5) étant assemblés l'un à l'autre à travers l'ouverture (2).
  8. Procédé de revêtement selon l'une des revendications 1 à 7, caractérisé en ce que le même potentiel électrique est appliqué sur le masque (4, 5) comme sur la pièce à revêtir (1).
EP20100008791 2009-09-07 2010-08-24 Procédé de revêtement Not-in-force EP2292338B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200910040206 DE102009040206A1 (de) 2009-09-07 2009-09-07 Beschichtungsverfahren

Publications (2)

Publication Number Publication Date
EP2292338A1 EP2292338A1 (fr) 2011-03-09
EP2292338B1 true EP2292338B1 (fr) 2013-09-18

Family

ID=43252012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20100008791 Not-in-force EP2292338B1 (fr) 2009-09-07 2010-08-24 Procédé de revêtement

Country Status (2)

Country Link
EP (1) EP2292338B1 (fr)
DE (1) DE102009040206A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023102875A1 (de) * 2023-02-07 2024-08-08 Venjakob Maschinenbau GmbH & Co. Kommanditgesellschaft Luftpolster Lackiersystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19814632C1 (de) * 1998-03-26 1999-10-14 Mannesmann Ag Verfahren und Vorrichtung zum Aufbringen einer Schutzschicht auf einem langgestreckten Körper, insbesondere Draht oder Rohr
US6451117B1 (en) * 2000-08-11 2002-09-17 Ford Global Tech., Inc. Paint mask and a method for utilizing the same
NZ527833A (en) * 2003-08-26 2006-06-30 Darren John Blade Application of powder paint using dielectric brush to charge powder, and rotating screen
DE10343946B4 (de) * 2003-09-23 2006-03-02 Holger Sprenger Verfahren zur partiellen Oberflächenbehandlung von Rädern oder Wellen

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Publication number Publication date
DE102009040206A1 (de) 2011-03-17
EP2292338A1 (fr) 2011-03-09

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