EP0399169B1 - Chemisches Verfahren zur Vermeidung eines Regenbogeneffektes, der durch die beim Glänzen von Teilen aus Aluminium oder Aluminiumlegierungen entstehende Oxydschicht hervorgerufen wird - Google Patents
Chemisches Verfahren zur Vermeidung eines Regenbogeneffektes, der durch die beim Glänzen von Teilen aus Aluminium oder Aluminiumlegierungen entstehende Oxydschicht hervorgerufen wird Download PDFInfo
- 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
Links
- 229910052782 aluminium Inorganic materials 0.000 title claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 9
- 230000000694 effects Effects 0.000 title claims description 9
- 229910000838 Al alloy Inorganic materials 0.000 title claims description 7
- 238000001311 chemical methods and process Methods 0.000 title claims description 4
- 239000004411 aluminium Substances 0.000 title claims 2
- 238000005498 polishing Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims description 6
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 claims description 4
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 3
- KRVSOGSZCMJSLX-UHFFFAOYSA-L chromic acid Substances O[Cr](O)(=O)=O KRVSOGSZCMJSLX-UHFFFAOYSA-L 0.000 claims description 3
- 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 claims description 3
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 claims 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 2
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 239000011651 chromium Substances 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000000987 azo dye Substances 0.000 description 1
- DJLCOAPFZCDZQW-UHFFFAOYSA-N chromium phosphoric acid Chemical compound [Cr].OP(O)(O)=O DJLCOAPFZCDZQW-UHFFFAOYSA-N 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002932 luster Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229940079827 sodium hydrogen sulfite Drugs 0.000 description 1
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)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3917186 | 1989-05-26 | ||
| 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 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0399169A2 EP0399169A2 (de) | 1990-11-28 |
| EP0399169A3 EP0399169A3 (de) | 1991-01-23 |
| EP0399169B1 true EP0399169B1 (de) | 1993-08-11 |
Family
ID=6381454
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90105558A Expired - Lifetime EP0399169B1 (de) | 1989-05-26 | 1990-03-23 | Chemisches Verfahren zur Vermeidung eines Regenbogeneffektes, der durch die beim Glänzen von Teilen aus Aluminium oder Aluminiumlegierungen entstehende Oxydschicht hervorgerufen wird |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5009756A (enrdf_load_stackoverflow) |
| EP (1) | EP0399169B1 (enrdf_load_stackoverflow) |
| JP (1) | JPH0313598A (enrdf_load_stackoverflow) |
| DE (2) | DE3917186A1 (enrdf_load_stackoverflow) |
Families Citing this family (3)
| 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)
| 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 |
| BE407434A (enrdf_load_stackoverflow) * | 1934-02-10 | |||
| NL41932C (enrdf_load_stackoverflow) * | 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 | |
| BE484777A (enrdf_load_stackoverflow) * | 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 |
-
1989
- 1989-05-26 DE DE3917186A patent/DE3917186A1/de active Granted
-
1990
- 1990-03-23 EP EP90105558A patent/EP0399169B1/de not_active Expired - Lifetime
- 1990-03-23 DE DE9090105558T patent/DE59002260D1/de not_active Expired - Fee Related
- 1990-05-23 US US07/527,587 patent/US5009756A/en not_active Expired - Fee Related
- 1990-05-28 JP JP2135541A patent/JPH0313598A/ja active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| DE3917186C2 (enrdf_load_stackoverflow) | 1992-06-25 |
| DE59002260D1 (de) | 1993-09-16 |
| US5009756A (en) | 1991-04-23 |
| EP0399169A2 (de) | 1990-11-28 |
| JPH0579759B2 (enrdf_load_stackoverflow) | 1993-11-04 |
| EP0399169A3 (de) | 1991-01-23 |
| JPH0313598A (ja) | 1991-01-22 |
| DE3917186A1 (de) | 1990-11-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE655700C (de) | Verfahren zur Herstellung opaker, emailaehnlicher Schutzschichten auf Aluminium und dessen Legierungen | |
| DE60217400T2 (de) | Herstellungsverfahren für ein eloxiertes kosmetisches behältnis mit abgesetzten glänzenden und strukturierten flächen | |
| DE1938039C3 (de) | Verfahren zur Behandlung von anodisch oxydierten Aluminiumoberflächen | |
| DE3917188C2 (enrdf_load_stackoverflow) | ||
| DE2239255C3 (de) | Wäßrige alkalische Losung zum Aufbringen eines korrosions- und wärmebeständigen, beschichtbaren und leicht einf ärbbaren Oxidüberzuges auf ein Substrat aus Aluminium oder einer Aluminiumlegierung | |
| EP0399169B1 (de) | Chemisches Verfahren zur Vermeidung eines Regenbogeneffektes, der durch die beim Glänzen von Teilen aus Aluminium oder Aluminiumlegierungen entstehende Oxydschicht hervorgerufen wird | |
| EP0090268A2 (de) | Verfahren zum Anodisieren von Aluminiumwerkstoffen und aluminierten Teilen | |
| DE715515C (de) | Verfahren zur anodischen Vorbehandlung zuvor in ueblicher Weise entfetteter Metalloberflaechen | |
| DE2844406C2 (de) | Nachverdichtungsbad und Verfahren zur Verhinderung von Belägen bei der Nachverdichtung anodisch oxidierter * Aluminiumoberflächen | |
| DE2805658C3 (de) | Verfahren zur elektrolytischen Färbung des nicht anodisierten Aluminiums oder seiner nicht anodisierten Legierungen | |
| DE69010242T2 (de) | Verfahren zur Herstellung von mit Harz beschichteten rostsicheren Stahlplatten mit guten Eigenschaften für die Elektrotauchlackierung. | |
| EP0235595A3 (de) | Verfahren, Anlage und Vorrichtung zum kontinuierlichen Entfetten und Reinigen der Oberfläche von Metallbändern, insbesondere kaltgewalztem Bandstahl | |
| EP0233503A1 (de) | Verfahren zum Aufbringen von Oxalat-überzügen auf Edelstahl | |
| EP0127774B1 (de) | Verfahren zum Schutz von anodisch oxidiertem Aluminium | |
| DE1170747B (de) | Verfahren zur Vorbehandlung von Titan oder einer Titanlegierung vor dem Aufbringen galvanischer UEberzuege | |
| DE2559195C3 (de) | Verfahren zur Herstellung eines Spiegels | |
| DE2100497A1 (de) | Verfahren zum elektrophoretischen Aufbringen von Farben auf eisenhaltigen Oberflachen | |
| DE3917184C2 (enrdf_load_stackoverflow) | ||
| DE3417355A1 (de) | Verfahren zum aufbringen eines klaren films aus einem anaphoretischen harz auf metallflaechen | |
| DE19907212A1 (de) | Edelstahlspüle | |
| DE631371C (de) | Verfahren zur Vorbehandlung von Aluminium und seinen Legierungen zwecks Erzeugung festhaftender galvanischer UEberzuege | |
| EP1443129A1 (de) | Verfahren zum Bearbeiten eines metallischen Werkstücks | |
| DE743194C (de) | Verfahren zum Glaenzendmachen der Oberflaeche von Gegenstaenden aus Aluminium und dessen Legierungen durch anodische Behandlung | |
| AT254648B (de) | Verfahren zur chemischen oder elektrolytischen Behandlung von metallischen Oberflächen | |
| DE1961003C (de) | Verfahren zur gleichmäßigen reprodu zierbaren Färbung von anodischen Oxidschich ten auf Aluminium oder Aluminiumlegierun gen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A2 Designated state(s): BE DE ES FR GB IT SE |
|
| PUAL | Search report despatched |
Free format text: ORIGINAL CODE: 0009013 |
|
| AK | Designated contracting states |
Kind code of ref document: A3 Designated state(s): BE DE ES FR GB IT SE |
|
| 17P | Request for examination filed |
Effective date: 19901214 |
|
| 17Q | First examination report despatched |
Effective date: 19920928 |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): BE DE ES FR GB IT SE |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED. Effective date: 19930811 Ref country code: SE Effective date: 19930811 Ref country code: ES Free format text: THE PATENT HAS BEEN ANNULLED BY A DECISION OF A NATIONAL AUTHORITY Effective date: 19930811 Ref country code: BE Effective date: 19930811 |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19930811 |
|
| REF | Corresponds to: |
Ref document number: 59002260 Country of ref document: DE Date of ref document: 19930916 |
|
| ET | Fr: translation filed | ||
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Effective date: 19940323 |
|
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| GBPC | Gb: european patent ceased through non-payment of renewal fee |
Effective date: 19940323 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: FR Effective date: 19941130 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: DE Effective date: 19941201 |
|
| REG | Reference to a national code |
Ref country code: FR Ref legal event code: ST |