EP0399169A3 - Chemical process to avoid a rainbow effect, provoked by an oxide layer that is caused during the polishing of pieces of aluminium or pieces of aluminium alloys - Google Patents

Chemical process to avoid a rainbow effect, provoked by an oxide layer that is caused during the polishing of pieces of aluminium or pieces of aluminium alloys Download PDF

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Publication number
EP0399169A3
EP0399169A3 EP19900105558 EP90105558A EP0399169A3 EP 0399169 A3 EP0399169 A3 EP 0399169A3 EP 19900105558 EP19900105558 EP 19900105558 EP 90105558 A EP90105558 A EP 90105558A EP 0399169 A3 EP0399169 A3 EP 0399169A3
Authority
EP
European Patent Office
Prior art keywords
pieces
aluminium
avoid
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.)
Granted
Application number
EP19900105558
Other languages
German (de)
French (fr)
Other versions
EP0399169B1 (en
EP0399169A2 (en
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/en
Publication of EP0399169A3 publication Critical patent/EP0399169A3/en
Application granted granted Critical
Publication of EP0399169B1 publication Critical patent/EP0399169B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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

Abstract

Es wird ein chemisches Verfahren zur Vermeidung eines Regenbogeneffekts, der durch die beim Glänzen von Teilen aus Aluminium oder Aluminiumle­ gierungen entstehende Oxydschicht hervorgerufen wird, bei dem die Teile in einem ersten Verfahrensschritt entfettet bzw. gereinigt und in einem zweiten Verfahrensschritt elektrolytisch-alkalisch ge­ glänzt werden, beschrieben, das sich dadurch auszeichnet, daß die Teile nach dem Glänzen einer Weiterbehandlung unterzogen werden, bei der die Teile zunächst in Wasser gespült, dann in einer Chrom­ säure-Lösung mit etwa 50 g/l CrO₃ bei etwa 98 o C etwa drei Minuten exponiert und schließlich in einer Natriumhydrogensulfit-Lösung noch­ mals gespült werden. It is a chemical process to avoid a rainbow effect, which is caused by the oxide layer when parts are made of aluminum or aluminum alloys, in which the parts are degreased or cleaned in a first process step and electrolytically alkaline in a second process step , described, which is characterized in that the parts are subjected to a further treatment after glossing, in which the parts are first rinsed in water, then in a chromic acid solution with about 50 g / l CrO₃ at about 98 o C for about three minutes exposed and finally rinsed again in a sodium bisulfite solution.

EP90105558A 1989-05-26 1990-03-23 Chemical process to avoid a rainbow effect, provoked by an oxide layer that is caused during the polishing of pieces of aluminium or pieces of aluminium alloys Expired - Lifetime EP0399169B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3917186A DE3917186A1 (en) 1989-05-26 1989-05-26 CHEMICAL METHOD FOR AVOIDING A RAINBOW EFFECT Caused By The Oxide Layer Formed In The Shining Of Parts Of Aluminum Or Aluminum Alloys
DE3917186 1989-05-26

Publications (3)

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

Family

ID=6381454

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90105558A Expired - Lifetime EP0399169B1 (en) 1989-05-26 1990-03-23 Chemical process to avoid a rainbow effect, provoked by an oxide layer that is caused during the polishing of pieces of aluminium or pieces of aluminium alloys

Country Status (4)

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

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3917188A1 (en) * 1989-05-26 1990-11-29 Happich Gmbh Gebr PROCESS FOR PRODUCING COLORED SURFACES ON PARTS OF ALUMINUM OR ALUMINUM ALLOYS
JP3828387B2 (en) * 2001-07-09 2006-10-04 日本軽金属株式会社 Surface treatment method of aluminum material and surface-treated aluminum material
ITMI20131604A1 (en) * 2013-09-30 2015-03-31 Ossidazione Anodica S R L PRECESSION TO CONFER A NICKEL-PLATED ELEMENT IN ANODIZED ALUMINUM WITHOUT THE USE OF NICKEL

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB606240A (en) * 1945-02-10 1948-08-10 Cie De Prod Chim Et Electro Me Improvements in the treatment of the surfaces of articles made of aluminium or its alloys
FR1003126A (en) * 1946-12-07 1952-03-14 Process for cleaning, smoothing and shining metal surfaces
US2647865A (en) * 1947-09-24 1953-08-04 Freud Herbert Manfred Brightening aluminum and aluminum alloy surfaces

Family Cites Families (9)

* 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 (en) * 1934-02-10
BE407434A (en) * 1934-02-10
US2153060A (en) * 1938-07-01 1939-04-04 Aluminum Co Of America Process for producing reflective aluminum surfaces
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 (en) * 1979-03-22 1980-07-02 Heidrun Below METHOD FOR THE ELECTROLYTIC GLACIATION OF ALUMINUM AND ALUMINUM ALLOYS IN AN ALKALINE ELECTROLYTE

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB606240A (en) * 1945-02-10 1948-08-10 Cie De Prod Chim Et Electro Me Improvements in the treatment of the surfaces of articles made of aluminium or its alloys
FR1003126A (en) * 1946-12-07 1952-03-14 Process for cleaning, smoothing and shining metal surfaces
US2647865A (en) * 1947-09-24 1953-08-04 Freud Herbert Manfred Brightening aluminum and aluminum alloy surfaces

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
S. WERNICK et al.: "The Surface Treatment and Finishing of Aluminium and its Alloys", Ausgabe 1, Band 5, 1987, Seiten 73-77, Finishing Publications Ltd, Teddington, Middlesex, GB *

Also Published As

Publication number Publication date
JPH0313598A (en) 1991-01-22
DE3917186A1 (en) 1990-11-29
EP0399169B1 (en) 1993-08-11
DE59002260D1 (en) 1993-09-16
EP0399169A2 (en) 1990-11-28
US5009756A (en) 1991-04-23
JPH0579759B2 (en) 1993-11-04
DE3917186C2 (en) 1992-06-25

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