EP1302567A1 - Coating method for light metal alloys - Google Patents
Coating method for light metal alloys Download PDFInfo
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- EP1302567A1 EP1302567A1 EP01124439A EP01124439A EP1302567A1 EP 1302567 A1 EP1302567 A1 EP 1302567A1 EP 01124439 A EP01124439 A EP 01124439A EP 01124439 A EP01124439 A EP 01124439A EP 1302567 A1 EP1302567 A1 EP 1302567A1
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- EP
- European Patent Office
- Prior art keywords
- light metal
- coating
- metal alloy
- electrophoretic
- 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.)
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- 229910001092 metal group alloy Inorganic materials 0.000 title claims abstract description 22
- 238000000576 coating method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims abstract description 17
- 229910019142 PO4 Inorganic materials 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 5
- 238000003618 dip coating Methods 0.000 claims abstract description 4
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 claims abstract description 3
- 238000006277 sulfonation reaction Methods 0.000 claims abstract description 3
- 239000010407 anodic oxide Substances 0.000 claims abstract 4
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 claims abstract 4
- 239000010452 phosphate Substances 0.000 claims abstract 4
- 230000004913 activation Effects 0.000 claims description 10
- 238000010422 painting Methods 0.000 claims description 9
- 239000000126 substance Substances 0.000 claims description 8
- 238000011282 treatment Methods 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 238000001465 metallisation Methods 0.000 claims description 5
- 239000003973 paint Substances 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 4
- 239000012790 adhesive layer Substances 0.000 claims 1
- 238000005058 metal casting Methods 0.000 claims 1
- 230000001737 promoting effect Effects 0.000 claims 1
- 239000004922 lacquer Substances 0.000 abstract description 4
- 239000002318 adhesion promoter Substances 0.000 abstract 1
- 230000003287 optical effect Effects 0.000 description 7
- 238000005260 corrosion Methods 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 6
- 239000011777 magnesium Substances 0.000 description 6
- 230000008901 benefit Effects 0.000 description 4
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 3
- 229910052749 magnesium Inorganic materials 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 3
- 238000007747 plating Methods 0.000 description 3
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- 229910000861 Mg alloy Inorganic materials 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229910001234 light alloy Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 229910000669 Chrome steel Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 101150003085 Pdcl gene Proteins 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- TVJORGWKNPGCDW-UHFFFAOYSA-N aminoboron Chemical compound N[B] TVJORGWKNPGCDW-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- ZCDOYSPFYFSLEW-UHFFFAOYSA-N chromate(2-) Chemical compound [O-][Cr]([O-])(=O)=O ZCDOYSPFYFSLEW-UHFFFAOYSA-N 0.000 description 1
- 238000004532 chromating Methods 0.000 description 1
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- AWJWCTOOIBYHON-UHFFFAOYSA-N furo[3,4-b]pyrazine-5,7-dione Chemical compound C1=CN=C2C(=O)OC(=O)C2=N1 AWJWCTOOIBYHON-UHFFFAOYSA-N 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229920001690 polydopamine Polymers 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
- C23C18/16—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by reduction or substitution, e.g. electroless plating
- C23C18/1601—Process or apparatus
- C23C18/1633—Process of electroless plating
- C23C18/1646—Characteristics of the product obtained
- C23C18/165—Multilayered product
- C23C18/1653—Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating
-
- 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
- C25D13/00—Electrophoretic coating characterised by the process
- C25D13/20—Pretreatment
Definitions
- the present invention relates to a coating method for Light alloy surfaces. Alloys with Al, Mg or two metals as essential components for the surface properties meant.
- the electrophoretic coating has the advantage of being very dense and to create stable layers that offer good corrosion protection.
- the electrophoretic lacquer layers have a good leveling effect Effect and thus also with comparatively rough original surfaces the light metal alloy a smoothed base for the subsequent galvanic Layer available. This benefits the optical quality.
- the galvanic coating has the advantage of an outstanding one Flexibility with regard to layer structure, material selection and layer thickness, see above that to the most diverse requirements in technical terms, like Roughness, abrasion resistance, hardness, conductivity, and also aesthetic requirements can be received.
- the method according to the invention is also in terms of size and geometry of the parts to be treated very flexible.
- the layer properties improve when the electrophoretic Lacquer layer is chemically metallized, for example with a chemical Ni layer or a chemical Cu layer is provided. At the same time Use of surface activation and chemical metallization the metallization takes place after activation.
- the chemical metallization can have a metal nucleation, in particular Pd activation, preceded by treatment in PdCl solution. Also this step follows the optional activation of the painted surface on. Between Pd activation and chemical metallization a reduction step for producing metallic Pd can be provided.
- the electrophoretic coating characteristic of the invention can be a be cathodic or anodic dip coating, the cathodic Dip painting with high demands on corrosion resistance especially is preferred. Otherwise, the step of electrophoretic painting considered in itself conventional and with the usual materials and processes carried out.
- the electrophoretic Paint layer it is preferred to switch between the electrophoretic Paint layer and the light metal alloy surface an adhesion-promoting To provide a layer, the electrophoretic painting a corresponding Send coating step ahead.
- bonding layers come especially chromate layers, treatments with Zr fluoride solutions or ZrTi fluoride solutions or other conversion layers.
- oxide layers are particularly preferred, the oxide layers also contain phosphates or consist of phosphates can.
- electrophoretic painting is provided to be provided on an anodic layer on the light metal alloy surface, the oxides and / or phosphates of the alloy components, in particular of Al and / or Mg.
- the electrophoretic painting used voltage is chosen higher than the voltage used in the anodic bonding layer.
- tension can be 10% or more above the tension at the anodic adhesive coating.
- the invention finds preferred application in light metal alloy castings, which the electrophoretic painting can level off if necessary and smoothing generated, so that in the subsequent galvanic coating a high degree of gloss can be achieved. If this smooth surface For example, if it is chrome-plated, there is a very high-quality optical effect.
- Preferred areas of application are housing parts of mobile telephones and others portable electronic devices such as laptops, PDAs and the like, or from cameras, binoculars or other optical devices.
- Light metal alloys are increasingly used in the automotive sector. Often there is a classic chrome plating or other high quality A look similar to metal surfaces is desirable. Examples are door handles and other fittings and rims.
- the invention is particularly advantageous in the case of light metal alloys with a higher one Mg content, because they have particularly severe corrosion problems. On the other hand, these alloys are because of their particularly low specific Weight technically very interesting. A preferred use case thus form light metal alloys with a Mg content of 50% by weight and about that.
- a housing part of a mobile phone can be made from a Mg alloy serve, which is the frame between two plastic shells forms and responsible for the mechanical stability of the mobile phone housing is. This is a cast part that is initially a rough one Surface with unfavorable optical properties shows.
- This housing part is first provided with an anodic oxidation / phosphating layer of 3-5 ⁇ m thickness offered by the Magnesium Technology Licensing Ltd. under the trade name "Anomag”. (Auckland, New Zealand) and their contractual partners. However, conventional Zr fluoride treatment or chromating can also be carried out (for example from 0.5-2 ⁇ m).
- the telephone housing part is then provided with a conventional cathodic dip coating with a layer thickness of approximately 10 ⁇ m in a reactor, which is activated in an SO 3 atmosphere. The surface of the casting is then leveled.
- the paint used is Freiotherm KTL special.
- the phone case part of the cell phone has been caused by use the Mg alloy is extremely light and good mechanical resilience. When tested, such parts have corrosion resistance shown with values over 500 hours salt spray test.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Electroplating Methods And Accessories (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Die vorliegende Erfindung bezieht sich auf ein Beschichtungsverfahren für Leichtmetalllegierungsoberflächen. Hiermit sind Legierungen mit Al, Mg oder beiden Metallen als für die Oberflächeneigenschaften wesentlichen Bestandteilen gemeint.The present invention relates to a coating method for Light alloy surfaces. Alloys with Al, Mg or two metals as essential components for the surface properties meant.
Die Oberflächenbehandlung solcher Leichtmetalllegierungen stellt ein besonderes Problem dar, weil diese Legierungen infolge ihres Gehalts an Al oder Mg relativ reaktionsfreudig und insbesondere oxidationsempfindlich sind. Andererseits werden Leichtmetalllegierungen in sehr vielen Gebieten der Technik zunehmend verwendet. Dies betrifft nicht nur klassische Anwendungen wie beispielsweise den Flugzeugbau, sondern auch neuere Anwendungen wie Kraftfahrzeugteile oder Gehäuseteile von hochwertigen Geräten. Zum einen sind diese Leichtmetalllegierungen wegen ihres geringen spezifischen Gewichts bei gleichzeitig guten mechanischen Eigenschaften kaum zu ersetzen, wenn die Gesamtmasse bei der Anwendung eine kritische Rolle spielt. Ein aktuelles Beispiel sind Gehäuse von Mobiltelefonen. Andererseits werden diese technischen Anwendungen durch die Probleme mit der Konservierung und dauerhaften optischen Veredlung solcher Leichtmetalllegierungsteile begrenzt oder zumindest behindert. The surface treatment of such light metal alloys is special Problem because these alloys due to their content of Al or Mg are relatively reactive and particularly sensitive to oxidation. on the other hand light metal alloys are becoming increasingly common in many areas of technology used. This does not only apply to classic applications such as aircraft construction, but also newer applications such as automotive parts or housing parts of high-quality devices. For one are these light alloys because of their low specific weight good mechanical properties can hardly be replaced when the Total mass plays a critical role in the application. A current example are housings of mobile phones. On the other hand, these are technical Applications due to the problems with preservation and permanent optical Finishing of such light metal alloy parts is limited or at least with special needs.
Zum Teil werden technisch sehr aufwendige und damit teure Verfahren eingesetzt, wie beispielsweise Sputterbeschichtungsverfahren. Solche Verfahren sind außerdem häufig mit zusätzlichen Beschränkungen versehen; beispielsweise ist die Sputterbeschichtung größerer Teile außerordentlich teuer oder unmöglich und können ferner nur vergleichsweise "offene" Teilegeometrien verwendet werden.In some cases, technically very complex and therefore expensive processes are used, such as sputter coating processes. Such procedures are often with additional restrictions; for example the sputter coating of larger parts is extremely expensive or impossible and can also only use comparatively "open" part geometries become.
Im übrigen bestehen bei vielen Beschichtungsverfahren erhebliche Probleme im Hinblick auf die Hafteigenschaften, die Korrosionsfestigkeit und die optische Qualität der resultierenden Oberflächen.In addition, there are considerable problems in many coating processes With regard to the adhesive properties, the corrosion resistance and the optical Quality of the resulting surfaces.
Der Erfindung liegt somit das technische Problem zugrunde, ein günstiges Beschichtungsverfahren
für Leichtmetalllegierungsoberflächen anzugeben.
Erfindungsgemäß ist hierzu ein Verfahren zum Beschichten von Leichtmetalllegierungsoberflächen
vorgesehen, das die Schritte enthält:
- elektrophoretische Lackierung der Leichtmetalllegierungsoberfläche und
- galvanische Beschichtung der elektrophoretisch lackierten Oberfläche.
According to the invention, a method for coating light metal alloy surfaces is provided for this purpose, which contains the steps:
- electrophoretic painting of the light metal alloy surface and
- galvanic coating of the electrophoretically painted surface.
Bevorzugte Ausgestaltungen dieses Verfahrens sind in den abhängigen Ansprüchen angegeben.Preferred embodiments of this method are in the dependent claims specified.
Im übrigen wird vorsorglich darauf hingewiesen, dass sich die Erfindung nicht nur auf die Verfahrensschritte sondern auch auf die dementsprechend beschichteten Teile richtet. Die Anmelderin behält sich also auch die Aufstellung von Ansprüchen der Produktkategorie vor. Die folgende Beschreibung ist also sowohl im Hinblick auf die Verfahrensmerkmale als auch im Hinblick auf die damit verbundenen Produktmerkmale der so beschichteten Teile zu verstehen.As a precaution, it is pointed out that the invention is not only on the process steps but also on the coated accordingly Parts aimed. The applicant therefore also keeps the list of claims of the product category. So the following description is both in terms of the procedural features and in terms of to understand associated product features of the parts coated in this way.
Die der Erfindung zugrundeliegende Erkenntnis besteht zunächst darin, dass sich die mangelhaften Eigenschaften galvanischer Schichten auf Leichtmetalllegierungen im Hinblick auf die optische Qualität und die Dauerhaftigkeit sowie den Korrosionsschutz dadurch dramatisch verbessern lässt, dass die galvanischen Schichten auf einer elektrophoretischen Lackschicht aufgebracht werden. Es hat sich überraschenderweise herausgestellt, dass die elektrophoretische Lackschicht der späteren galvanischen Beschichtung der Leichtmetalllegierungsteile nicht grundsätzlich im Wege steht und die Vorteile dieser Verfahren daher miteinander kombiniert werden können.The knowledge on which the invention is based initially consists in the fact that the poor properties of galvanic layers on light metal alloys in terms of optical quality and durability as well Corrosion protection can be dramatically improved by galvanic Layers are applied to an electrophoretic lacquer layer. It has surprisingly been found that the electrophoretic Paint layer of the later galvanic coating of the light metal alloy parts does not fundamentally stand in the way and the benefits of these procedures can therefore be combined with each other.
Insbesondere hat die elektrophoretische Lackierung den Vorteil, sehr dichte und stabile Schichten zu erzeugen, die damit einen guten Korrosionsschutz bieten. Außerdem haben die elektrophoretischen Lackschichten eine gute einebnende Wirkung und stellen damit auch bei vergleichsweise rauhen Originaloberflächen der Leichtmetalllegierung eine geglättete Unterlage für die nachfolgende galvanische Schicht zur Verfügung. Dies kommt der optischen Qualität zugute.In particular, the electrophoretic coating has the advantage of being very dense and to create stable layers that offer good corrosion protection. In addition, the electrophoretic lacquer layers have a good leveling effect Effect and thus also with comparatively rough original surfaces the light metal alloy a smoothed base for the subsequent galvanic Layer available. This benefits the optical quality.
Andererseits hat die galvanische Beschichtung den Vorteil einer überragenden Flexibilität im Hinblick auf Schichtaufbau, Materialauswahl und Schichtdicke, so dass auf die unterschiedlichsten Anforderungen in technischer Hinsicht, wie Rauhigkeit, Abriebfestigkeit, Härte, Leitfähigkeit, und auch ästhetischen Anforderungen eingegangen werden kann.On the other hand, the galvanic coating has the advantage of an outstanding one Flexibility with regard to layer structure, material selection and layer thickness, see above that to the most diverse requirements in technical terms, like Roughness, abrasion resistance, hardness, conductivity, and also aesthetic requirements can be received.
Im übrigen ist das erfindungsgemäße Verfahren auch im Hinblick auf Größe und Geometrie der zu behandelnden Teile sehr flexibel.Otherwise, the method according to the invention is also in terms of size and geometry of the parts to be treated very flexible.
Es hat sich als vorteilhaft herausgestellt, die elektrophoretisch lackierte Oberfläche vor der galvanischen Beschichtung zu aktivieren. Dazu können die klassischen Aktivierungsschritte aus der Kunststoffgalvanik verwendet werden. Vorzugsweise kommen eine Sulfonierung (SO3-Atmosphäre) oder eine Behandlung mit Chromsäure oder einer anderen Lösung von sechswertigem Chrom in Frage. Beide Behandlungen führen zu einer chemischen Veränderung der lackierten Oberfläche, die die Möglichkeiten der Abscheidung der galvanischen Schicht verbessern.It has proven to be advantageous to activate the electrophoretically painted surface before the galvanic coating. The classic activation steps from plastic electroplating can be used for this. Sulfonation (SO 3 atmosphere) or treatment with chromic acid or another solution of hexavalent chromium are preferred. Both treatments lead to a chemical change in the painted surface, which improves the possibilities of depositing the galvanic layer.
Außerdem verbessern sich die Schichteigenschaften, wenn die elektrophoretische Lackschicht chemisch metallisiert wird, beispielsweise mit einer chemischen Ni-Schicht oder einer chemischen Cu-Schicht versehen wird. Bei gleichzeitiger Verwendung der Oberflächenaktivierung und der chemischen Metallisierung erfolgt die Metallisierung nach der Aktivierung. In addition, the layer properties improve when the electrophoretic Lacquer layer is chemically metallized, for example with a chemical Ni layer or a chemical Cu layer is provided. At the same time Use of surface activation and chemical metallization the metallization takes place after activation.
Ferner kann der chemischen Metallisierung eine Metallbekeimung, insbesondere Pd-Aktivierung, vorausgehen, etwa eine Behandlung in PdCl-Lösung. Auch dieser Schritt schließt sich an die optionale Aktivierung der lackierten Oberfläche an. Zwischen der Pd-Aktivierung und der chemischen Metallisierung kann ein Reduktionsschritt zur Erzeugung von metallischem Pd vorgesehen sein.Furthermore, the chemical metallization can have a metal nucleation, in particular Pd activation, preceded by treatment in PdCl solution. Also this step follows the optional activation of the painted surface on. Between Pd activation and chemical metallization a reduction step for producing metallic Pd can be provided.
Die für die Erfindung charakteristische elektrophoretische Lackierung kann eine kathodische oder anodische Tauchlackierung sein, wobei die kathodische Tauchlackierung bei hohen Anforderungen an die Korrosionsfestigkeit besonders bevorzugt ist. Im übrigen ist der Schritt der elektrophoretischen Lackierung an sich betrachtet konventionell und wird mit den üblichen Materialien und Verfahren durchgeführt.The electrophoretic coating characteristic of the invention can be a be cathodic or anodic dip coating, the cathodic Dip painting with high demands on corrosion resistance especially is preferred. Otherwise, the step of electrophoretic painting considered in itself conventional and with the usual materials and processes carried out.
Bei der Erfindung ist es jedoch bevorzugt, zwischen der elektrophoretischen Lackschicht und der Leichtmetalllegierungsoberfläche eine haftvermittelnde Schicht vorzusehen, der elektrophoretischen Lackierung also einen entsprechenden Beschichtungsschritt vorauszuschicken. Als Haftvermittlungsschichten kommen insbesondere Chromatschichten, Behandlungen mit Zr-Fluoridlösungen oder ZrTi-Fluoridlösungen oder andere Konversionsschichten in Betracht. Besonders bevorzugt sind hier allerdings oxidische Schichten, wobei die oxidischen Schichten auch Phosphate enthalten oder aus Phosphaten bestehen können. Insbesondere ist vorgesehen, die elektrophoretische Lackierung auf einer anodischen Schicht auf der Leichtmetalllegierungsoberfläche vorzusehen, die Oxide und/oder Phosphate der Legierungskomponenten, also insbesondere von Al und/oder Mg, aufweist.In the invention, however, it is preferred to switch between the electrophoretic Paint layer and the light metal alloy surface an adhesion-promoting To provide a layer, the electrophoretic painting a corresponding Send coating step ahead. As bonding layers come especially chromate layers, treatments with Zr fluoride solutions or ZrTi fluoride solutions or other conversion layers. However, oxide layers are particularly preferred, the oxide layers also contain phosphates or consist of phosphates can. In particular, electrophoretic painting is provided to be provided on an anodic layer on the light metal alloy surface, the oxides and / or phosphates of the alloy components, in particular of Al and / or Mg.
Besonders gute Ergebnisse lassen sich erzielen, wenn die bei der elektrophoretischen Lackierung verwendete Spannung höher gewählt wird als die bei der anodischen Haftvermittlungsschicht verwendete Spannung. Die Spannung kann insbesondere um 10% oder mehr über der Spannung bei der anodischen Haftvermittlungsbeschichtung liegen.Particularly good results can be achieved if the electrophoretic painting used voltage is chosen higher than the voltage used in the anodic bonding layer. The In particular, tension can be 10% or more above the tension at the anodic adhesive coating.
Bevorzugte Anwendung findet die Erfindung bei Leichtmetalllegierungsgussteilen, denen die elektrophoretische Lackierung bei Bedarf eine hohe Einebnung und Glättung erzeugt, so daß bei der nachfolgenden galvanischen Beschichtung ein hoher Glanzgrad erzielt werden kann. Wenn diese glatte Oberfläche beispielsweise verchromt ist, ergibt sich eine sehr hochwertige optische Wirkung.The invention finds preferred application in light metal alloy castings, which the electrophoretic painting can level off if necessary and smoothing generated, so that in the subsequent galvanic coating a high degree of gloss can be achieved. If this smooth surface For example, if it is chrome-plated, there is a very high-quality optical effect.
Bevorzugte Anwendungsgebiete sind Gehäuseteile von Mobiltelefonen und anderen tragbaren elektronischen Geräten wie Laptops, PDAs und dergleichen, oder von Kameras, Ferngläsern oder anderen optischen Geräten. Außerdem finden Leichtmetalllegierungen zunehmend im Kraftfahrzeugbereich Anwendung. Häufig ist dabei eine klassischen Verchromungen oder anderen hochwertigen Metalloberflächen ähnelnde Optik erwünscht. Beispiele sind Türgriffe und andere Beschlagteile sowie Felgen.Preferred areas of application are housing parts of mobile telephones and others portable electronic devices such as laptops, PDAs and the like, or from cameras, binoculars or other optical devices. Moreover Light metal alloys are increasingly used in the automotive sector. Often there is a classic chrome plating or other high quality A look similar to metal surfaces is desirable. Examples are door handles and other fittings and rims.
Die Erfindung ist von besonderem Vorteil bei Leichtmetalllegierungen mit höherem Mg-Anteil, weil bei diesen besonders starke Korrosionsprobleme auftreten. Andererseits sind diese Legierungen wegen ihres besonders niedrigen spezifischen Gewichts technisch sehr interessant. Einen bevorzugten Anwendungsfall bilden somit Leichtmetalllegierungen mit einem Mg-Anteil von 50 Gew.-% und darüber.The invention is particularly advantageous in the case of light metal alloys with a higher one Mg content, because they have particularly severe corrosion problems. On the other hand, these alloys are because of their particularly low specific Weight technically very interesting. A preferred use case thus form light metal alloys with a Mg content of 50% by weight and about that.
Als Ausführungsbeispiel kann ein Gehäuseteil eines Mobiltelefons aus einer Mg-Legierung dienen, welches den Rahmen zwischen zwei Kunststoffschalen bildet und für die mechanische Stabilität des Mobiltelefongehäuses verantwortlich ist. Dabei handelt sich um ein Gussteil, das an sich zunächst eine rauhe Oberfläche mit ungünstigen optischen Eigenschaften zeigt.As an exemplary embodiment, a housing part of a mobile phone can be made from a Mg alloy serve, which is the frame between two plastic shells forms and responsible for the mechanical stability of the mobile phone housing is. This is a cast part that is initially a rough one Surface with unfavorable optical properties shows.
Dieses Gehäuseteil wird zunächst mit einer unter dem Handelsnamen "Anomag" angebotenen anodischen Oxidations-/Phosphatierungsschicht von 3-5µm Stärke versehen, die von der Magnesium Technology Licensing Ltd. (Auckland, Neuseeland) und deren Vertragspartnern angeboten wird. Es kann aber auch eine konventionelle Zr-Fluoridbehandlung oder Chromatierung erfolgen (z.B. von 0,5-2µm). Daraufhin wird das Telefongehäuseteil mit einer üblichen kathodischen Tauchlackierung mit etwa 10 µm Schichtdicke in einem Reaktor versehen, die in einer SO3-Atmosphäre aktiviert wird. Damit ist die Oberfläche des Gussteils eingeebnet. Der verwendete Lack ist Freiotherm KTL spezial.This housing part is first provided with an anodic oxidation / phosphating layer of 3-5 µm thickness offered by the Magnesium Technology Licensing Ltd. under the trade name "Anomag". (Auckland, New Zealand) and their contractual partners. However, conventional Zr fluoride treatment or chromating can also be carried out (for example from 0.5-2 µm). The telephone housing part is then provided with a conventional cathodic dip coating with a layer thickness of approximately 10 μm in a reactor, which is activated in an SO 3 atmosphere. The surface of the casting is then leveled. The paint used is Freiotherm KTL special.
Nach einer Pd-Bekeimung, einem Reduktionsschritt in Aminoboran und der Abscheidung einer konventionellen chemischen Ni-Schicht von 0,5-1 µm Stärke erfolgt eine galvanische Vernickelung (10µm) und dann Verchromung (1µm), die eine mit verchromten Stahlteilen direkt vergleichbare Oberflächenqualität und Dauerhaftigkeit ergibt.After Pd nucleation, a reduction step in aminoborane and the deposition a conventional chemical Ni layer of 0.5-1 µm thickness galvanic nickel plating (10µm) followed by chrome plating (1µm), the one with chrome steel parts directly comparable surface quality and durability.
Andererseits hat das Telefongehäuseteil des Mobiltelefons infolge der Verwendung der Mg-Legierung ein außerordentlich geringes Gewicht und eine gute mechanische Belastbarkeit. Bei Tests haben solche Teile Korrosionsfestigkeiten mit Werten über 500 Stunden Salzsprühtest gezeigt.On the other hand, the phone case part of the cell phone has been caused by use the Mg alloy is extremely light and good mechanical resilience. When tested, such parts have corrosion resistance shown with values over 500 hours salt spray test.
Claims (13)
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01124439A EP1302567A1 (en) | 2001-10-11 | 2001-10-11 | Coating method for light metal alloys |
| PCT/EP2002/011292 WO2003033779A2 (en) | 2001-10-11 | 2002-10-09 | Coating method for light metal alloys |
| US10/492,283 US20040238371A1 (en) | 2001-10-11 | 2002-10-09 | Coated method for light metal alloys |
| AU2002346981A AU2002346981A1 (en) | 2001-10-11 | 2002-10-09 | Coating method for light metal alloys |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP01124439A EP1302567A1 (en) | 2001-10-11 | 2001-10-11 | Coating method for light metal alloys |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP1302567A1 true EP1302567A1 (en) | 2003-04-16 |
Family
ID=8178946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01124439A Withdrawn EP1302567A1 (en) | 2001-10-11 | 2001-10-11 | Coating method for light metal alloys |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20040238371A1 (en) |
| EP (1) | EP1302567A1 (en) |
| AU (1) | AU2002346981A1 (en) |
| WO (1) | WO2003033779A2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076196A (en) * | 2010-12-01 | 2011-05-25 | 英华达（上海）科技有限公司 | Technology for manufacturing film-covered metal shell with exposed adhesive area |
| WO2017001548A1 (en) * | 2015-07-02 | 2017-01-05 | Aesculap Ag | Coating for applicators in electrosurgery |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4617173B2 (en) * | 2004-04-26 | 2011-01-19 | キヤノン株式会社 | Optical equipment with moisture-proof function |
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- 2001-10-11 EP EP01124439A patent/EP1302567A1/en not_active Withdrawn
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2002
- 2002-10-09 WO PCT/EP2002/011292 patent/WO2003033779A2/en not_active Application Discontinuation
- 2002-10-09 US US10/492,283 patent/US20040238371A1/en not_active Abandoned
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076196A (en) * | 2010-12-01 | 2011-05-25 | 英华达（上海）科技有限公司 | Technology for manufacturing film-covered metal shell with exposed adhesive area |
| WO2017001548A1 (en) * | 2015-07-02 | 2017-01-05 | Aesculap Ag | Coating for applicators in electrosurgery |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003033779B1 (en) | 2004-01-15 |
| US20040238371A1 (en) | 2004-12-02 |
| WO2003033779A3 (en) | 2003-11-20 |
| AU2002346981A1 (en) | 2003-04-28 |
| WO2003033779A2 (en) | 2003-04-24 |
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