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EP1678345A1 - Couches de conversion colorees sans chrome formees sur des surfaces metalliques - Google Patents

Couches de conversion colorees sans chrome formees sur des surfaces metalliques

Info

Publication number
EP1678345A1
EP1678345A1 EP04790238A EP04790238A EP1678345A1 EP 1678345 A1 EP1678345 A1 EP 1678345A1 EP 04790238 A EP04790238 A EP 04790238A EP 04790238 A EP04790238 A EP 04790238A EP 1678345 A1 EP1678345 A1 EP 1678345A1
Authority
EP
European Patent Office
Prior art keywords
ions
treatment solution
metal
range
aqueous treatment
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
EP04790238A
Other languages
German (de)
English (en)
Other versions
EP1678345B1 (fr
Inventor
Pavel Gentschev
Matthias Schweinsberg
Marco Bastian
Ulrich JÜPTNER
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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 Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP1678345A1 publication Critical patent/EP1678345A1/fr
Application granted granted Critical
Publication of EP1678345B1 publication Critical patent/EP1678345B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of aluminium or alloys based thereon
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • 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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process

Definitions

  • the invention is in the field of chemical surface treatment of zinc or galvanized steel, aluminum, magnesium or their alloys. It describes chrome-free conversion processes for such metal surfaces, i. H. chemical treatment processes that lead to the formation of a surface layer in which both cations of the treated metal surface and ions from the treatment solution are incorporated.
  • the chrome-free coating is colored so that a simple visual check can be used to determine whether an adequate conversion layer has been formed.
  • the task of this conversion layer is to reduce the tendency of the metal surface to corrode and to produce good adhesion between the metal surface and an organic coating applied to the conversion layer, such as, for example, a varnish or an adhesive.
  • WO 94/25640 discloses a method for producing blue-colored conversion layers on zinc / aluminum alloys.
  • the metal surfaces are brought into contact with a treatment solution which has a pH between 3.5 and 6 and which contains 0.2 to 3.0% by weight of molybdenum and a fluoride content of 0.1 to 2.0%. -% having.
  • Molybdenum can be used as molybdate, as phosphomolybenic acid, as molybdenum chloride and the like.
  • Fluoride can be used in the form of hydrofluoric acid, simple fluorides, but also complex fluoric acids such as fluorotitanic acid or fluorozirconic acid.
  • the treatment solution contains heterooxo anions of molybdenum, tungsten or vanadium with one of the hetero ions phosphorus, aluminum, silicon, manganese, zirconium, titanium, tin, cerium or nickel.
  • the treatment solution also contains an organic film former, which can be selected, for example, from acrylates.
  • the heterooxo anions such as anions of heteropolyacids, can be formed directly in the treatment solution by adding the starting products for this, for example molybdenum ions and phosphoric acid.
  • the treatment solution should preferably contain an etchant for aluminum, for example fluoride, tetrafluoroborate or similarly acting etchants.
  • WO 00/26437 goes the way of coloring the conversion layer using an organic dye (alizerin dye).
  • the conversion layer itself is produced with a treatment solution which contains complex fluorides, for example of titanium and zirconium, in addition to other inorganic oxides, hydroxides or carbonates or their reaction products with the fluoric acids.
  • a poly-4-hydroxystyrene (polyvinylphenol) substituted with amino groups can be present as the organic polymer.
  • colored layers on aluminum can be obtained by chemical oxidation with aromatic nitro compounds.
  • the different positional isomers of nitrobenzoic acid can be used for this.
  • the chemical oxidation of aluminum surfaces with persulfate ions is described in DE-A-741 337.
  • the aim is to produce crystal-clear and colorless layers on aluminum and its alloys. According to this document, such are obtained Layers by allowing ammonia in a hot, aqueous solution, which also contains an addition of alkali metal sulfate, advantageously 1%, to act on the carefully cleaned light metal. It can be cleaned, for example, by immersing it in concentrated nitric acid.
  • the treatment with the ammoniacal persulfate solution takes place at temperatures of at least 70 ° C.
  • the time period is approximately 15 to 60 minutes. It is reported that protective layers are also obtained at temperatures below 70 ° C, but are less translucent and often yellowish. In the context of the disclosure of the document mentioned, such yellow-tinted layers are obviously undesirable, since the treated parts are not to be painted but rather to retain their metallic appearance.
  • the inventors of the present invention found that colored (light gold to gold-colored) layers are obtained on surfaces of suitable metals at reduced temperature and shortened treatment time, which are chromium-free on the one hand and which have excellent adhesion to a subsequently applied coating on the other organic polymers, for example a lacquer or an adhesive.
  • the present invention relates to a method for producing colored layers on surfaces of zinc, aluminum, magnesium or their alloys, the surfaces being brought into contact with a chromium-free aqueous treatment solution which contains a total of 3 to 35 g / l persulfate ions and / or contains peroxodisulfate ions and not more than 10 g / l ammonia or ammonium ions, has a pH in the range from 10 to 12 and a temperature in the range from 30 to 70 ° C, the surfaces being in the range from 0 to 5 to 5 minutes in contact with the treatment solution.
  • the treatment solution can contain 8 to 35 g / l persulfate ions.
  • the persulfate and / or peroxodisulfate ions are preferably introduced into the treatment solution as alkali metal salts, in particular as sodium or potassium salts.
  • the required alkaline pH is preferably set by means of an alkali solution, in particular sodium hydroxide solution and / or potassium hydroxide solution. This avoids odor problems that otherwise occur when working with hot alkaline ammonia solutions, as is obviously the case with the method according to DE-A-741 337.
  • the aqueous treatment solution preferably contains no more than 1 g / l ammonia or ammonium ions. According to DE-A-741 337, temperatures of at least 70 ° C.
  • the treatment solution in the process according to the invention has a temperature in the range from 30 to 70 ° C. At temperatures above 70 ° C, strongly colored layers are also obtained, but these have a reduced paint adhesion.
  • the duration of treatment is in the range of 0.5 to 5 minutes. With shorter treatment times, sufficient layers are no longer formed. Treatment times above 5 minutes lead to strongly colored layers, but the paint adhesion on these layers deteriorates.
  • the surfaces are first cleaned before the chemical oxidation step. This can be done, for example, by briefly pickling in cold, concentrated nitric acid. Or the surfaces are rubbed with a chamois.
  • the metal surfaces are first cleaned with an alkaline cleaning solution, if necessary rinsed with water, preferably with demineralized water, and then decapitated in an acidic solution, for example in nitric acid.
  • the metal surfaces are prepared in such a way that, on the one hand, they assume a uniform light golden to golden color in the chemical oxidation process step and, on the other hand, have good adhesion properties to a subsequent coating based on organic polymers.
  • the invention relates to a method for treating surfaces of zinc, aluminum, magnesium or their alloys, the surfaces being a) cleaned with an alkaline cleaning solution, b) then picked up with an acidic solution, c) then with one Chromium-free aqueous treatment solution which contains a total of 3 to 35 g / l persulfate ions and / or peroxodisulfate ions and has a pH in the range from 10 to 12 and a temperature in the range from 30 to 70 ° C. for a period in the range from 0, 5 to 5 minutes in contact.
  • the metal surfaces are washed with water, preferably with deionized water rinsed. Depending on the type of subsequent coating with organic polymers, the metal surfaces are dried or not after rinsing with water. Does that happen
  • the coating based on organic polymers is, for example, an adhesive or a powder coating, it is preferable to use the
  • the treatment solution has no other metal ions apart from alkali metal and possibly alkaline earth metal ions, for example no zinc ions and in particular no heavy metal ions.
  • the aqueous treatment solution can additionally contain about 1 to about 50 g / l of sulfate ions, for example in the form of sodium or potassium salts.
  • the hydrolysis of the persulfate and / or peroxodisulfate ions is suppressed by an excess of sulfate ions without their effect on the production of a colored layer waning.
  • the content of persulfate and / or peroxodisulfate ions in the aqueous treatment solution must therefore be added less frequently or to a lesser extent, which leads to savings in chemical costs.
  • the invention relates to a method according to one or more of claims 1 to 7, characterized in that the metal surfaces are rinsed after being brought into contact with the aqueous treatment solution and coated with a coating based on organic polymers ,
  • These metal strips, metal sheets or metal parts can have a coating based on organic polymers, for example one or more layers of paint or an adhesive layer, on the colored conversion layer which results from the treatment with the solution containing persulfate and / or peroxodisulfate.
  • the metal parts produced according to the invention can be connected to other metal parts via this adhesive layer. Such metal strips, metal sheets or metal parts also belong to the scope of the present invention. embodiments
  • Sample sheets made of aluminum AI 99.5 (the alloys AlMgSH, AlMgSiMn and AlMgSiO, 5 lead to similar results) were subjected to the following treatment steps:
  • the lacquered test panels were subjected to a boiling test with a cross cut to test the lacquer adhesion.
  • the coated test panels were boiled in demineralized water for 2 hours and then stored at room temperature for 1 hour.
  • the cross-cut test was then carried out.
  • a corrosion test salt spray test according to DIN 50021 SS was carried out and the paint penetration at the scratch was measured according to DIN 53167. The results are shown in Table 1.
  • Table 1 Treatment parameters and treatment results

Landscapes

  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Paints Or Removers (AREA)

Abstract

L'invention concerne un procédé de réalisation de couches colorées sur des surfaces de zinc, d'aluminium, de magnésium ou d'alliages de ceux-ci. Selon ledit procédé : on met en contact lesdites surfaces avec une solution de traitement aqueuse exempte de chrome, qui contient au total 3 à 35 g/l d'ions persulfate et/ou d'ions peroxodisulfate, et, au maximum, 10 g/l d'ammoniaque ou d'ions ammonium, et présente un pH compris dans la plage 10-12 et une température comprise dans la plage 30-70 °C ; on maintient en contact lesdites surfaces avec la solution de traitement pendant 0,5 à 5 minutes et, éventuellement, on les recouvre d'un revêtement à base de polymères organiques. L'invention concerne en outre des pièces métalliques traitées selon ce procédé.
EP04790238.2A 2003-11-07 2004-10-09 Couches de conversion colorees sans chrome formees sur des surfaces metalliques Expired - Lifetime EP1678345B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10352076 2003-11-07
PCT/EP2004/011315 WO2005047565A1 (fr) 2003-11-07 2004-10-09 Couches de conversion colorees sans chrome formees sur des surfaces metalliques

Publications (2)

Publication Number Publication Date
EP1678345A1 true EP1678345A1 (fr) 2006-07-12
EP1678345B1 EP1678345B1 (fr) 2013-11-20

Family

ID=34584924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04790238.2A Expired - Lifetime EP1678345B1 (fr) 2003-11-07 2004-10-09 Couches de conversion colorees sans chrome formees sur des surfaces metalliques

Country Status (3)

Country Link
US (2) US7828911B2 (fr)
EP (1) EP1678345B1 (fr)
WO (1) WO2005047565A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7413777B2 (en) * 2004-06-12 2008-08-19 Allfast Fastening Systems, Inc. Coating composition and methods of coating
US7674666B2 (en) * 2007-02-23 2010-03-09 Sensor Electronic Technology, Inc. Fabrication of semiconductor device having composite contact
US8338871B2 (en) * 2008-12-23 2012-12-25 Sensor Electronic Technology, Inc. Field effect transistor with electric field and space-charge control contact
US8586997B2 (en) 2011-02-15 2013-11-19 Sensor Electronic Technology, Inc. Semiconductor device with low-conducting field-controlling element
WO2013036593A1 (fr) 2011-09-06 2013-03-14 Sensor Electronic Technology, Inc. Dispositif à semi-conducteur doté d'un élément de commande de champ à faible conduction
US9673285B2 (en) 2011-11-21 2017-06-06 Sensor Electronic Technology, Inc. Semiconductor device with low-conducting buried and/or surface layers
US8994035B2 (en) 2011-11-21 2015-03-31 Sensor Electronic Technology, Inc. Semiconductor device with low-conducting buried and/or surface layers
CA2953199A1 (fr) 2014-06-27 2015-12-30 Henkel Ag & Co. Kgaa Lubrifiant sec pour acier recouvert de zinc

Family Cites Families (15)

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Publication number Priority date Publication date Assignee Title
DE426206C (de) * 1923-03-29 1926-06-15 Aluminum Co Of America Verfahren zur Herstellung eines haftenden UEberzuges auf Aluminiumgegenstaenden
DE724540C (de) * 1941-04-03 1942-09-02 Vaw Ver Aluminium Werke Ag Verfahren zur Erzeugung von tiefschwarzen Schutzschichten auf Aluminium und Aluminiumlegierungen
DE741337C (de) * 1941-04-03 1943-11-10 Vaw Ver Aluminium Werke Ag Verfahren zur Herstellung von glasklaren und farblosen Oxydschichten auf Aluminium und Aluminium-Legierungen
FR2461764A1 (fr) 1979-07-23 1981-02-06 Popescu Francine Bain et procede pour l'oxydation chimique de l'aluminium
US4381203A (en) * 1981-11-27 1983-04-26 Amchem Products, Inc. Coating solutions for zinc surfaces
US4509992A (en) * 1982-01-18 1985-04-09 Parker Chemical Company Processes and compositions for the treatment of aluminum surfaces
KR910001088A (ko) * 1988-06-13 1991-01-30 원본 미기재 알루미늄용 보호 및 착색 코팅
JP3325334B2 (ja) 1993-04-28 2002-09-17 日本パーカライジング株式会社 溶融亜鉛−アルミニウム合金めっき鋼板の光輝性青色処理方法
DE4317217A1 (de) 1993-05-24 1994-12-01 Henkel Kgaa Chromfreie Konversionsbehandlung von Aluminium
WO1995014117A1 (fr) 1993-11-16 1995-05-26 Ici Australia Operations Pty. Ltd. Traitement anticorrosion d'acier possedant des revetements d'aluminium, de zinc ou de leurs alliages
AUPM621194A0 (en) * 1994-06-10 1994-07-07 Commonwealth Scientific And Industrial Research Organisation Conversion coating and process for its formation
CA2348848A1 (fr) 1998-10-30 2000-05-11 Henkel Corporation Couche de conversion visible exempte de chrome et de phosphore pour l'aluminium et ses alliages
US20040177898A1 (en) * 1999-10-25 2004-09-16 Altitech Ab Method and means for corrosion preventive surface treatment of metals
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Also Published As

Publication number Publication date
EP1678345B1 (fr) 2013-11-20
WO2005047565A1 (fr) 2005-05-26
US20060272748A1 (en) 2006-12-07
US20110011498A1 (en) 2011-01-20
US8268096B2 (en) 2012-09-18
US7828911B2 (en) 2010-11-09

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