EP0399169B1 - Procédé chimique pour éviter un effet arc en ciel, provoqué par une couche d'oxyde produite par le polissage des pièces en aluminium ou en alliages d'aluminium - Google Patents

Procédé chimique pour éviter un effet arc en ciel, provoqué par une couche d'oxyde produite par le polissage des pièces en aluminium ou en alliages d'aluminium Download PDF

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Publication number
EP0399169B1
EP0399169B1 EP90105558A EP90105558A EP0399169B1 EP 0399169 B1 EP0399169 B1 EP 0399169B1 EP 90105558 A EP90105558 A EP 90105558A EP 90105558 A EP90105558 A EP 90105558A EP 0399169 B1 EP0399169 B1 EP 0399169B1
Authority
EP
European Patent Office
Prior art keywords
pieces
aluminium
parts
oxide layer
chemical process
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.)
Expired - Lifetime
Application number
EP90105558A
Other languages
German (de)
English (en)
Other versions
EP0399169A3 (fr
EP0399169A2 (fr
Inventor
Peter Venn
Klaus-Dieter Bartkowski
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.)
Johnson Controls Interiors GmbH and Co KG
Original Assignee
Gebrueder Happich 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 Gebrueder Happich GmbH filed Critical Gebrueder Happich GmbH
Publication of EP0399169A2 publication Critical patent/EP0399169A2/fr
Publication of EP0399169A3 publication Critical patent/EP0399169A3/fr
Application granted granted Critical
Publication of EP0399169B1 publication Critical patent/EP0399169B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/18—Polishing of light metals
    • C25F3/20—Polishing of light metals of aluminium

Definitions

  • the invention relates to a chemical process for avoiding a rainbow effect, which is caused by the oxide layer formed when parts made of aluminum or aluminum alloys are shiny, in which the parts are degreased or cleaned in a first process step and electrolytically alkaline polished in a second process step will.
  • Aluminum parts such as aluminum pressed or rolled profiles, are among others in the building hardware and lighting industry or in particular in the automotive industry with e.g. Window border systems or as a decorative frame, target lists and. Like. Used. It is also known to use parts made of aluminum or aluminum alloys that have a colored anodized surface.
  • Such parts made of aluminum or aluminum alloys are first ground, then polished, degreased, regardless of whether they are to be left natural or colored and polished, the parts being treated in a glossy manner in an alkaline electrolyte operated by direct current. It has been shown that the oxide layer that forms when the parts shine produces an iridescent rainbow effect that is extremely undesirable. While the above-mentioned effect is usually only slightly visible with colorless (natural-colored) anodized layers, the rainbow effect, especially with colored anodized layers, is often so strong that it is no longer acceptable.
  • the present invention is based on the object of demonstrating a chemical process for avoiding a rainbow effect which is caused by the oxide layer which forms when parts made of aluminum or aluminum alloys are shiny.
  • This object is achieved on the basis of a method of the type mentioned at the outset, in a simple, advantageous and progressive manner according to the invention, in that the parts are subjected to a further treatment after the luster, in which the parts are first rinsed in water, then in a chromic acid solution exposed to about 50 g / l CrO3 at about 98 ° C for about 3 minutes and finally rinsed again in a sodium bisulfite solution.
  • the invention therefore provides that the parts made of aluminum or aluminum alloys are rinsed in water and then exposed in a chromic acid solution, the oxide layer or the oxide film (Schmand) being removed.
  • the subsequent rinsing of the parts in a sodium hydrogen sulfite solution has the effect that the 6-valent chromium is reduced to the 3-valent chromium.
  • the parts treated in this way can be left natural or colored.
  • the parts are exposed in a subsequent process step in an electrolyte containing metal salts using alternating current and then chemically adsorbed in a further process step in a dye bath containing azo dye.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • ing And Chemical Polishing (AREA)

Claims (1)

  1. Procédé chimique destiné à éviter un effet d'arc-en-ciel, provoqué par la couche d'oxyde qui est produite par le polissage brillant de pièces en aluminium ou en alliages d'aluminium, dans lequel les pièces sont dégraissées ou nettoyées dans une première étape de procédé et sont polies brillantes au cours d'une seconde étape de procédé par un procédé électrolytique alcalin, caractérisé en ce qu'après polissage brillant, les pièces sont soumises à un traitement complémentaire au cours duquel les pièces sont d'abord rincées à l'eau, puis laissées trois minutes environ dans une solution d'acide chromique à raison de 50 g/l CrO₃ à une température d'environ 98° C et enfin rincées encore une fois dans une solution de bisulfite de sodium.
EP90105558A 1989-05-26 1990-03-23 Procédé chimique pour éviter un effet arc en ciel, provoqué par une couche d'oxyde produite par le polissage des pièces en aluminium ou en alliages d'aluminium Expired - Lifetime EP0399169B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917186A DE3917186A1 (de) 1989-05-26 1989-05-26 Chemisches verfahren zur vermeidung eines regenbogeneffekts, der durch die beim glaenzen von teilen aus aluminium oder aluminiumlegierungen entstehende oxydschicht hervorgerufen wird
DE3917186 1989-05-26

Publications (3)

Publication Number Publication Date
EP0399169A2 EP0399169A2 (fr) 1990-11-28
EP0399169A3 EP0399169A3 (fr) 1991-01-23
EP0399169B1 true EP0399169B1 (fr) 1993-08-11

Family

ID=6381454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105558A Expired - Lifetime EP0399169B1 (fr) 1989-05-26 1990-03-23 Procédé chimique pour éviter un effet arc en ciel, provoqué par une couche d'oxyde produite par le polissage des pièces en aluminium ou en alliages d'aluminium

Country Status (4)

Country Link
US (1) US5009756A (fr)
EP (1) EP0399169B1 (fr)
JP (1) JPH0313598A (fr)
DE (2) DE3917186A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3917188A1 (de) * 1989-05-26 1990-11-29 Happich Gmbh Gebr Verfahren zur erzeugung farbiger oberflaechen auf teilen aus aluminium oder aluminium-legierungen
JP3828387B2 (ja) * 2001-07-09 2006-10-04 日本軽金属株式会社 アルミニウム材の表面処理方法及び表面処理アルミニウム材
ITMI20131604A1 (it) * 2013-09-30 2015-03-31 Ossidazione Anodica S R L Precesso per conferire un aspetto nichelato ad elementi in alluminio anodizzato senza l'impiego di nickel

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708655A (en) * 1955-05-17 Electrolytic polishing of aluminum
US2108603A (en) * 1933-08-02 1938-02-15 Aluminum Co Of America Production of aluminum reflecting surfaces
NL41932C (fr) * 1934-02-10
BE407434A (fr) * 1934-02-10
US2153060A (en) * 1938-07-01 1939-04-04 Aluminum Co Of America Process for producing reflective aluminum surfaces
FR994860A (fr) * 1945-02-10 1951-11-23 Alais & Froges & Camarque Cie Perfectionnements aux traitement des surfaces d'articles en aluminium et en alliagesd'aluminium
FR1003126A (fr) * 1946-12-07 1952-03-14 Procédé pour nettoyer, doucir et brillanter les surfaces métalliques
IT454258A (fr) * 1947-09-24
US2721835A (en) * 1951-07-07 1955-10-25 Shwayder Bros Inc Surface treatment of aluminum articles
US3544356A (en) * 1967-11-01 1970-12-01 Bell Telephone Labor Inc Process for the surface treatment of aluminum and its alloys
US3957553A (en) * 1972-08-09 1976-05-18 Pennwalt Corporation Non-chromated alkaline etching bath and etching process for aluminum
DD142569A1 (de) * 1979-03-22 1980-07-02 Heidrun Below Verfahren zum elektrolytischen glaenzen von aluminium und aluminiumlegierungen in einem alkalischen elektrolyten

Also Published As

Publication number Publication date
US5009756A (en) 1991-04-23
JPH0313598A (ja) 1991-01-22
DE3917186C2 (fr) 1992-06-25
JPH0579759B2 (fr) 1993-11-04
DE59002260D1 (de) 1993-09-16
DE3917186A1 (de) 1990-11-29
EP0399169A3 (fr) 1991-01-23
EP0399169A2 (fr) 1990-11-28

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