DE19621861A1 - Chromium plating of aluminium alloy automobile wheel rim - Google Patents

Chromium plating of aluminium alloy automobile wheel rim

Info

Publication number
DE19621861A1
DE19621861A1 DE1996121861 DE19621861A DE19621861A1 DE 19621861 A1 DE19621861 A1 DE 19621861A1 DE 1996121861 DE1996121861 DE 1996121861 DE 19621861 A DE19621861 A DE 19621861A DE 19621861 A1 DE19621861 A1 DE 19621861A1
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DE
Germany
Prior art keywords
aluminium alloy
wheel rim
automobile wheel
chromium plating
rim
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE1996121861
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German (de)
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to DE1996121861 priority Critical patent/DE19621861A1/en
Publication of DE19621861A1 publication Critical patent/DE19621861A1/en
Withdrawn legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05DPROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B05D5/067Metallic effect
    • B05D5/068Metallic effect achieved by multilayers
    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34Pretreatment of metallic surfaces to be electroplated
    • C25D5/42Pretreatment of metallic surfaces to be electroplated of light metals
    • C25D5/44Aluminium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

A process for chromium plating of an automobile wheel rim of aluminium alloy involves applying a powder or wet lacquer priming layer, drying, applying a wet lacquer layer having the character of conductive ABS plastic, drying and then chromium electroplating.

Description

Um Aluminium und Aluminiumlegierungen galvanisch mit einem metallischen Überzug zu versehen, ist es bekannt, eine Zwischenbehandlung einzuschalten; denn der Oxidfilm des Aluminiums würde das Haften des galvanischen Nieder­ schlags verhindern. Die Zwischenbehandlung ist entweder eine chemische, in der in alkalischen Lösungen Zink oder in sauren Bädern Eisen als galvanisierbare Metallschicht niedergeschlagen wird, oder eine anodische Behandlung nach dem Elytal-Verfahren. Auch durch Tauchen in leicht flüssige Salzschmelzen und anschließend in ein alkali­ sches Ätzbad kann eine galvanisierbare Oberfläche erzeugt werden.To galvanize with aluminum and aluminum alloys to provide a metallic coating, it is known to turn on an intermediate treatment; because the oxide film of aluminum would adhere to the galvanic low prevent blow. The intermediate treatment is either a chemical in which zinc or in alkaline solutions in acidic baths iron as a galvanizable metal layer is put down, or an anodic treatment according to the Elytal process. Even by diving in easily liquid salt melts and then in an alkali etching bath can produce a galvanizable surface will.

Wollte man nun eine Auto-Felge aus einer Aluminiumlegie­ rung mit einem galvanischen Überzug aus Chrom versehen, der sowohl die Eigenschaften eines Korrosionsschutzes als auch die einer dekorativen Außenhaut in sich vereinigt, so ist es im Hinblick auf das hohen Beanspruchungen un­ terworfene besondere Einsatzgebiet einer Auto-Felge zur Erzielung eines hohen Verschleißwiderstands der Chrom­ schicht erforderlich, die bei der Galvanisierung zur An­ wendung gelangenden Kupfer-, Nickel- und Chrombäder mit größeren Stromdichten und insbesondere höheren Temperatu­ ren zu versehen. Hierbei kann jedoch nicht ausgeschlossen werden, daß sich Zugeigenspannungen ausbilden, die bei Rißbildung zu einer Beeinträchtigung der mechanischen Eigenschaften, insbesondere der Schwingfestigkeit, führen können. Außerdem sind Beeinträchtigungen der Gefügezusam­ mensetzung des Grundmaterials der Auto-Felgen nicht aus­ zuschließen. Folglich hat man in der Praxis von der Ver­ chromung von Auto-Felgen aus Aluminiumlegierungen bislang Abstand genommen.Now you wanted a car rim made of an aluminum alloy with a galvanic coating made of chrome, which has both the properties of corrosion protection and also unites that of a decorative outer skin,  so it is in view of the high demands special application area of a car rim Achieving a high wear resistance of the chrome layer required for galvanizing copper, nickel and chrome baths higher current densities and in particular higher temperatures to provide. However, this cannot be ruled out be that tensile residual stresses develop at Cracking affects the mechanical Properties, especially the fatigue strength can. In addition, structural impairments are common setting of the basic material of the car rims not close. Consequently, in practice, the Ver Chroming of car rims from aluminum alloys so far Distance.

Man hat vielmehr Auto-Felgen aus Aluminiumlegierungen le­ diglich mit einer gegen Korrosion schützenden Grundierung versehen und auf diese Grundierung dann eine Lackschicht in zumeist silbergrauer Farbe in Annäherung an das Ausse­ hen von Aluminium aufgebracht.Rather, you have car rims made of aluminum alloys only with a primer that protects against corrosion then apply a layer of lacquer to this primer mostly silver-gray in color, approximating the exterior hen applied by aluminum.

Der Erfindung liegt ausgehend vom Stand der Technik die Aufgabe zugrunde, ein Verfahren zum Verchromen einer Auto-Felge aus einer Aluminiumlegierung zu schaffen, bei welchem keine negativen Beeinträchtigungen des Grundmate­ rials der Auto-Felge zu befürchten sind.The invention is based on the prior art Task, a method for chrome plating To create car rim from an aluminum alloy, at which has no negative impact on the basic material rials of the car rim are to be feared.

Entsprechend diesem Verfahren wird die Oberfläche der Auto-Felge aus einer Aluminiumlegierung wie auch bei dem bekannten Lackierungs-Verfahren zunächst mit einer Grun­ dierungsschicht aus Pulver oder Naßlack versehen. Nach dem Trocknen dieser Grundierungsschicht, insbesondere in einem entsprechenden Ofen, wird dann auf die Grundie­ rungsschicht ein Naßlack mit einer besonderen Eigenschaft aufgetragen. Es handelt sich hierbei um einen Naßlack, der nach dem Trocknen den Charakter von Galvano-ABS- Kunststoff aufweist. Wird dann die derart behandelte Auto-Felge in ein Chrombad getaucht, so reagiert dieses naturgemäß physikalisch auf Galvano-ABS-Kunststoff, so daß der Auto-Felge bei einer geringen Stromdichte und re­ lativ niedrigen Badtemperaturen eine einwandfreie Chrom­ schicht als Außenhaut vermittelt werden kann.According to this method, the surface of the Car rim made of an aluminum alloy like that known painting process first with a green Apply a coating of powder or wet paint. After drying this primer layer, especially in an appropriate oven, is then on the Grundie a wet paint with a special property applied. It is a wet paint,  which after drying has the character of galvano-ABS Has plastic. Will then be treated like this Car rim dipped in a chrome bath, this reacts naturally physically on galvano-ABS plastic, see above that the car rim at a low current density and re relatively low bath temperatures a flawless chrome layer can be conveyed as an outer skin.

Hierbei ergibt sich der besondere Vorteil, daß aufgrund der niedrigen Badtemperaturen keine Veränderungen des Ge­ füges des Grundmaterials der Auto-Felge zu befürchten sind, so daß ihr Einsatz im Kraftfahrzeugbau unbedenklich erscheint. Außerdem entspricht eine verchromte Auto-Felge aus einer Aluminiumlegierung nicht nur dem momentan herr­ schenden Zeitgefühl nach verchromten glänzenden Teilen, sondern auch dem Wunsch der Kraftfahrzeugindustrie, das Gewicht der Autos zu senken.This has the particular advantage that due to the low bath temperatures no changes in the Ge fear of the basic material of the car rim are, so that their use in motor vehicle construction is harmless appears. A chrome-plated car rim also corresponds made of an aluminum alloy not only that at the moment send a sense of time for chrome-plated shiny parts, but also the desire of the automotive industry that Reduce weight of cars.

Ein weiterer Vorteil der Erfindung besteht darin, daß jetzt der Herstellungsaufwand für die Außenhaut aus Chrom merklich gesenkt werden kann. Sowohl das Aufbringen der Grundierungsschicht als auch der die Galvanisierung mit Chrom ermöglichenden Naßlackschicht (Leitschicht) kann mit einfachen herkömmlichen standardisierten Vorrichtun­ gen und Geräten durchgeführt werden. Letztlich sind auch für das Chrombad geringere Stromdichten und geringere Temperaturen und damit ein deutlich geringerer Energie­ aufwand erforderlich.Another advantage of the invention is that now the manufacturing effort for the outer skin made of chrome can be significantly reduced. Both applying the Primer layer as well as the galvanization with Chromium enabling wet paint layer (conductive layer) can with simple conventional standardized devices conditions and devices. Ultimately, too for the chrome bath lower current densities and lower Temperatures and thus a significantly lower energy effort required.

Claims (1)

Verfahren zum Verchromen einer Auto-Felge aus einer Alumi­ niumlegierung, bei welchem zunächst die Oberfläche der Auto-Felge mit einer Grundierungsschicht aus Pulver oder Naßlack versehen und die Auto-Felge dann getrocknet wird, daß anschließend auf die getrocknete Grundierungsschicht eine den Charakter von Galvano-ABS-Kunststoff aufweisende Naßlackschicht gebracht und die Auto-Felge nochmals getrocknet wird, und daß letztlich die derart vorbehandelte Auto-Felge galvanisch verchromt wird.Process for chrome plating a car rim from an aluminum nium alloy, in which the surface of the Auto rim with a primer layer of powder or Wet paint and then the car rim is dried, that then on the dried primer coat one with the character of galvano-ABS plastic Brought wet paint layer and the car rim again is dried, and that ultimately such pretreated car rim is electroplated.
DE1996121861 1996-05-31 1996-05-31 Chromium plating of aluminium alloy automobile wheel rim Withdrawn DE19621861A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1996121861 DE19621861A1 (en) 1996-05-31 1996-05-31 Chromium plating of aluminium alloy automobile wheel rim

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1996121861 DE19621861A1 (en) 1996-05-31 1996-05-31 Chromium plating of aluminium alloy automobile wheel rim

Publications (1)

Publication Number Publication Date
DE19621861A1 true DE19621861A1 (en) 1997-12-11

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DE1996121861 Withdrawn DE19621861A1 (en) 1996-05-31 1996-05-31 Chromium plating of aluminium alloy automobile wheel rim

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DE (1) DE19621861A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001007688A1 (en) * 1999-07-21 2001-02-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Metallized component, method for the production thereof and the use of said component
US6703135B1 (en) 1998-02-26 2004-03-09 Fraunhofer-Gesellschaft Zur Fordering Der Angewandten Forschung E.V. Method for producing a corrosion protective coating and a coating system for substrates made of light metal
WO2004027106A1 (en) * 2002-09-13 2004-04-01 Carat Gmbh Method for coating motor vehicle rims
EP1561843A2 (en) * 2004-02-07 2005-08-10 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Process for the production of corrosion resistant and decorative coatings and coating systems for substrates of light-metal or light-metal alloys
GB2416355A (en) * 2004-07-20 2006-01-25 Kuo-Bin Chen A method for forming a coating on a wheel and the structure of the coating
DE102005034731A1 (en) * 2005-07-22 2007-01-25 Wagner, Jens Corrosion-resistant electroplating of automobile wheel rim of light metal alloy, by applying layer of fluidized acrylonitrile-butadiene-styrene terpolymer to mechanically treated rim and hardening before plating

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6703135B1 (en) 1998-02-26 2004-03-09 Fraunhofer-Gesellschaft Zur Fordering Der Angewandten Forschung E.V. Method for producing a corrosion protective coating and a coating system for substrates made of light metal
WO2001007688A1 (en) * 1999-07-21 2001-02-01 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Metallized component, method for the production thereof and the use of said component
WO2004027106A1 (en) * 2002-09-13 2004-04-01 Carat Gmbh Method for coating motor vehicle rims
EP1561843A2 (en) * 2004-02-07 2005-08-10 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Process for the production of corrosion resistant and decorative coatings and coating systems for substrates of light-metal or light-metal alloys
US7235167B2 (en) 2004-02-07 2007-06-26 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Method for the manufacture of corrosion resistant and decorative coatings and laminated systems for metal substrates
EP1561843A3 (en) * 2004-02-07 2008-09-10 Dr. Ing. h.c. F. Porsche Aktiengesellschaft Process for the production of corrosion resistant and decorative coatings and coating systems for substrates of light-metal or light-metal alloys
GB2416355A (en) * 2004-07-20 2006-01-25 Kuo-Bin Chen A method for forming a coating on a wheel and the structure of the coating
DE102005034731A1 (en) * 2005-07-22 2007-01-25 Wagner, Jens Corrosion-resistant electroplating of automobile wheel rim of light metal alloy, by applying layer of fluidized acrylonitrile-butadiene-styrene terpolymer to mechanically treated rim and hardening before plating

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