EP3545118B1 - Zusammensetzung und verfahren zur chromfreien vorbehandlung von aluminiumoberflächen - Google Patents

Zusammensetzung und verfahren zur chromfreien vorbehandlung von aluminiumoberflächen Download PDF

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Publication number
EP3545118B1
EP3545118B1 EP17792018.8A EP17792018A EP3545118B1 EP 3545118 B1 EP3545118 B1 EP 3545118B1 EP 17792018 A EP17792018 A EP 17792018A EP 3545118 B1 EP3545118 B1 EP 3545118B1
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EP
European Patent Office
Prior art keywords
range
aqueous composition
calculated
compound
content
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EP17792018.8A
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German (de)
English (en)
French (fr)
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EP3545118A1 (de
Inventor
Heiko HELLMERS
Thomas Wendel
Norbert Maurus
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Chemetall GmbH
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Chemetall GmbH
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Priority to PL17792018T priority Critical patent/PL3545118T3/pl
Publication of EP3545118A1 publication Critical patent/EP3545118A1/de
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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
    • C23C22/06—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 aqueous acidic solutions with pH less than 6
    • C23C22/34—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides
    • C23C22/36—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates
    • C23C22/361—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 aqueous acidic solutions with pH less than 6 containing fluorides or complex fluorides containing also phosphates containing titanium, zirconium or hafnium compounds
    • 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
    • C23C22/06—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 aqueous acidic solutions with pH less than 6
    • C23C22/40—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 aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates
    • C23C22/44—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 aqueous acidic solutions with pH less than 6 containing molybdates, tungstates or vanadates containing also fluorides or complex fluorides
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium

Definitions

  • the present invention relates to a chromium-free composition for the pretreatment of aluminum surfaces, a corresponding method and a correspondingly pretreated component or strip.
  • composition according to claim 1 a concentrate according to claim 9, a method according to claim 10 and a component or band according to claim 14.
  • aqueous is to be understood as meaning that more than 50% by weight of the solvent contained is water.
  • Chromium-free composition means that only raw materials are used for their production that contain chromium as an impurity in the ppm range at most.
  • an "aluminum surface” is to be understood as meaning a surface which consists at least partly of aluminum or an aluminum alloy.
  • hexafluorozirconic acid is intended to encompass not only hexafluorozirconic acid itself but also its single and double deprotonated form. The same applies to "hexafluorotitanic acid”.
  • phosphate is also intended to include pyrophosphate, polyphosphate, and in each case all mono- or multiply protonated forms.
  • molybdate is also intended to include its singly or doubly protonated form.
  • organic polymer is also intended to include organic copolymers and mixtures of organic polymers and / or copolymers.
  • the present invention relates to an aqueous, chromium-free composition for the pretreatment of aluminum surfaces which contains at least one water-soluble phosphorus compound, at least one water-soluble zirconium compound, at least one water-soluble titanium compound and at least one water-soluble molybdenum compound, the phosphorus compound content in the range from 15 to 50 mg / l (calculated as phosphorus), the content of zirconium compound in the range from 400 to 600 mg / l (calculated as metal), the content of titanium compound in the range from 85 to 400 mg / l (calculated as metal) and the content of molybdenum compound in the Range from 40 to 150 mg / l (calculated as metal), and wherein the aqueous composition has a pH (at room temperature) in the range from 2.0 to 5.0.
  • the content of phosphorus compound is preferably in the range from 25 to 40 mg / l (calculated as phosphorus), the content of zirconium compound in the range from 450 to 540 mg / l (calculated as metal), the content of titanium compound in the range from 200 to 400 mg / l (calculated as metal), and the content of molybdenum compound in the range from 60 to 130 mg / l (calculated as metal).
  • the content of phosphorus compound is particularly preferably in the range from 30 to 38 mg / l (calculated as phosphorus), the content of zirconium compound in the range from 470 to 520 mg / l (calculated as metal), the content of titanium compound in the range from 350 to 380 mg / l (calculated as metal), and the content of molybdenum compound in the range from 80 to 125 mg / l (calculated as metal).
  • the ratios of the individual contents of phosphorus compound, zirconium compound, titanium compound and molybdenum compound are preferably in the range from (0.04 to 0.40) to (1.4 to 5.8) to 1.0 to (0.10 to 1.4 ), particularly preferably in the range from (0.06 to 0.25) to (1.4 to 3.5) to 1.0 to (0.15 to 0.9) and very particularly preferably in the range from (0, 08 to 0.12) to (1.4 to 1.5) to 1.0 to (0.20 to 0.40) (normalized to the titanium compound content).
  • the aqueous composition preferably contains free fluoride, the content of free fluoride being in the range from 40 to 100 mg / l, preferably in the range from 60 to 80 mg / l, and the total content of fluoride in the range from 1 to 2 g / l , preferably in the range from 1.4 to 1.8 g / l.
  • the content of free fluoride is determined potentiometrically by means of a fluoride-sensitive electrode at room temperature, the total fluoride content by distillation according to Seel and potentiometrically.
  • the at least one zirconium compound here preferably comprises hexafluorozirconic acid and the at least one titanium compound comprises hexafluorotitanic acid.
  • the at least one zirconium compound is particularly preferably hexafluorozirconic acid and the at least one titanium compound is hexafluorotitanic acid.
  • the at least one phosphorus compound is preferably phosphate.
  • the at least one molybdenum compound is preferably molybdate.
  • the at least one phosphorus compound is particularly preferably phosphate and the at least one molybdenum compound is molybdate.
  • the at least one zirconium compound is hexafluorozirconic acid
  • the at least one titanium compound is hexafluorotitanic acid
  • the at least one phosphorus compound is phosphate
  • the at least one molybdenum compound is molybdate.
  • the aqueous composition preferably has a pH (at room temperature) in the range from 3.0 to 4.0. Furthermore, the aqueous composition preferably has Free acid points in the range from 3.9 to 4.5 and total acid points no greater than 25.
  • the aqueous composition has a pH (at room temperature) in the range from 3.0 to 4.0, free acid points in the range from 3.9 to 4.5 and total acid points of not more than 25 .
  • aqueous composition 25 ml of the aqueous composition are diluted with 100 ml of distilled water in a suitable vessel and mixed with approx. 5 ml of a 25% potassium fluoride solution and 5 drops of a phenolphthalein solution. With 0.1 M sodium hydroxide solution the color changes to red, i.e. titrated to pH 8.6. The volume in ml of the sodium hydroxide solution consumed in the titration gives the free acid points.
  • aqueous composition 25 ml of the aqueous composition are diluted in a suitable vessel with 100 ml of distilled water and 5 drops of a phenolphthalein solution are added.
  • a phenolphthalein solution With 0.1 M sodium hydroxide solution the color changes to red, i.e. titrated to pH 8.6.
  • the volume in ml of the sodium hydroxide solution used in the titration gives the total acid points.
  • the aqueous composition preferably contains a total of no more than 1 mg / l, particularly preferably no more than 0.5 mg / l and very particularly preferably no more than 0.1 mg / l of organic polymer.
  • organic polymers in particular of polyacrylic acid, can in fact have a detrimental effect on the paint adhesion achieved.
  • the aqueous composition preferably contains no more than 300 mg / l, particularly preferably no more than 100 mg / l, of aluminum.
  • Aluminum is not added during the production of the aqueous composition, but it enters the latter via the chemical reaction between the aluminum surface to be treated and the treatment solution.
  • the aqueous composition preferably contains not more than 20 mg / l, particularly preferably not more than 10 mg / l, of the elements As, Ba, Cd, Co, Cu, Mn, Ni, Pb, Sb, Sn, Sr, V and Ce .
  • the present invention also relates to a concentrate from which the aqueous composition according to the invention can be obtained by diluting with water and optionally adjusting the pH value with a suitable acid or base.
  • the present invention also relates to a method for the chromium-free pretreatment of aluminum surfaces, in which an optionally cleaned and rinsed surface, which consists at least partially of aluminum or an aluminum alloy, with the The aqueous composition according to the invention is brought into contact and then optionally rinsed and / or dried.
  • Said surface is in particular the surface of a component or of a strip.
  • the surface preferably consists predominantly, particularly preferably exclusively or almost exclusively, of aluminum or at least one aluminum alloy.
  • Suitable aluminum alloys are in particular aluminum-magnesium alloys such as those of the 5000 series and aluminum-magnesium-silicon alloys such as those of the 2000 series.
  • the surface can be brought into contact with the composition according to the invention by immersion application or by spray application.
  • the surface is preferably brought into contact with the composition according to the invention for 4 to 10 seconds at 45 to 60 ° C., particularly preferably for 5 to 7 seconds at 50 to 55 ° C.
  • the surface is preferably brought into contact with the aqueous treatment solution in such a way that a phosphor layer (calculated as P 2 O 5 ) in the range from 8 to 17 mg / m 2 , preferably in the range from 10 to 15 mg / m 2 , a zirconium layer in Range from 1 to 6 mg / m 2 , preferably in the range from 1 to 2 mg / m 2 , a titanium layer in the range from 7 to 19 mg / m 2 , preferably in the range from 11 to 16 mg / m 2 , and a molybdenum layer in the range from 6 to 18 mg / m 2 , preferably in the range from 9 to 14 mg / m 2 , results on the surface.
  • a phosphor layer (calculated as P 2 O 5 ) in the range from 8 to 17 mg / m 2 , preferably in the range from 10 to 15 mg / m 2
  • a zirconium layer in Range from 1 to
  • the surface is the surface of a tape, the surface being immersed in the aqueous composition for 5 to 10 seconds at 50 to 55 ° C.
  • the surface is first cleaned with alkaline or alkaline and acidic, then thoroughly, preferably in several stages, rinsed with water and immersed in the aqueous composition.
  • the present invention also relates to a component or strip with a surface which at least partially consists of aluminum or an aluminum alloy, the component or strip being obtainable using the method according to the invention and optionally being painted.
  • the surface of the component or strip preferably has a phosphor layer (calculated as P 2 O 5 ) in the range from 8 to 17 mg / m 2 , preferably in the range from 10 to 15 mg / m 2 , and a zirconium layer in the range from 1 to 6 mg / m 2 , preferably in the range from 1 to 2 mg / m 2 , a titanium layer in the range from 7 to 19 mg / m 2 , preferably in the range from 11 to 16 mg / m 2 , and a molybdenum layer in the range from 6 to 18 mg / m 2 , preferably in the range from 9 to 14 mg / m 2 .
  • a phosphor layer (calculated as P 2 O 5 ) in the range from 8 to 17 mg / m 2 , preferably in the range from 10 to 15 mg / m 2
  • a zirconium layer in the range from 1 to 6 mg / m 2 , preferably in the range
  • the present invention can improve paint adhesion.
  • compositions B1 to B6 according to the invention shown in Table 1 and the compositions VB1 to VB4 not according to the invention were produced as follows.
  • the amounts of phosphorus (as P 2 O 5 ), zirconium, titanium and molybdenum were each determined by means of X-ray fluorescence analysis (XRF) (see Tab. 2 ).
  • the metal sheets were then coated with a polyamino resin combination using a 30 ⁇ m doctor blade.
  • the lacquer was then baked in the oven for 45 seconds at 250 ° C. (max. Temperature of the metal sheets: 224 ° C.) so that a lacquer layer thickness of 7 ⁇ m was obtained.
  • compositions B1 to B6 according to the invention both in the T-bend test and in the cross-cut test.
  • B1 and B2 deliver the best results.

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  • 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)
EP17792018.8A 2016-11-23 2017-10-25 Zusammensetzung und verfahren zur chromfreien vorbehandlung von aluminiumoberflächen Active EP3545118B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17792018T PL3545118T3 (pl) 2016-11-23 2017-10-25 Kompozycja i sposób bezchromowej obróbki wstępnej powierzchni aluminiowych

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016223170 2016-11-23
PCT/EP2017/077308 WO2018095684A1 (de) 2016-11-23 2017-10-25 Zusammensetzung und verfahren zur chromfreien vorbehandlung von aluminiumoberflächen

Publications (2)

Publication Number Publication Date
EP3545118A1 EP3545118A1 (de) 2019-10-02
EP3545118B1 true EP3545118B1 (de) 2020-08-19

Family

ID=60201551

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Application Number Title Priority Date Filing Date
EP17792018.8A Active EP3545118B1 (de) 2016-11-23 2017-10-25 Zusammensetzung und verfahren zur chromfreien vorbehandlung von aluminiumoberflächen

Country Status (9)

Country Link
US (1) US11686000B2 (pl)
EP (1) EP3545118B1 (pl)
CN (1) CN109983160B (pl)
CA (1) CA3041934A1 (pl)
ES (1) ES2832656T3 (pl)
PL (1) PL3545118T3 (pl)
RU (1) RU2754069C2 (pl)
WO (1) WO2018095684A1 (pl)
ZA (1) ZA201903869B (pl)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5143562A (en) * 1991-11-01 1992-09-01 Henkel Corporation Broadly applicable phosphate conversion coating composition and process
MY130189A (en) * 1994-03-24 2007-06-29 Nihon Parkerizing Aqueous composition and solution and process for metallic surface-treating an aluminum-containing metal material
DE4417965A1 (de) * 1994-05-21 1995-11-23 Henkel Kgaa Eisenphosphatierung unter Verwendung von substituierten Monocarbonsäuren
WO2002010476A1 (en) * 2000-08-01 2002-02-07 Henkel Kommanditgesellschaft Auf Aktien Phosphate conversion coating concentrate
US7947333B2 (en) 2006-03-31 2011-05-24 Chemetall Gmbh Method for coating of metallic coil or sheets for producing hollow articles
DE102006039633A1 (de) * 2006-08-24 2008-03-13 Henkel Kgaa Chromfreies, thermisch härtbares Korrosionsschutzmittel
DE102009047522A1 (de) * 2009-12-04 2011-06-09 Henkel Ag & Co. Kgaa Mehrstufiges Vorbehandlungsverfahren für metallische Bauteile mit Zink- und Eisenoberflächen
IT1397902B1 (it) * 2010-01-26 2013-02-04 Np Coil Dexter Ind Srl Processi di pretrattamento alla verniciatura, a basso impatto ambientale, alternativi ai trattamenti tradizionali di fosfatazione.
CN103276384B (zh) * 2013-05-06 2015-12-09 大庆宝丰科技有限公司 通用型金属陶化皮膜处理剂及制备方法
CN104561975A (zh) * 2014-12-30 2015-04-29 广州市泓硕环保科技有限公司 一种铝合金免水洗彩色无铬钝化膜及钝化液和使用方法
CN108350579A (zh) 2015-09-15 2018-07-31 凯密特尔有限责任公司 用含锆和钼的组合物预处理铝表面

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ZA201903869B (en) 2022-12-21
CN109983160A (zh) 2019-07-05
US11686000B2 (en) 2023-06-27
RU2754069C2 (ru) 2021-08-25
ES2832656T3 (es) 2021-06-10
CA3041934A1 (en) 2018-05-31
BR112019010258A2 (pt) 2019-09-03
RU2019118432A (ru) 2020-12-24
EP3545118A1 (de) 2019-10-02
US20200063267A1 (en) 2020-02-27
RU2019118432A3 (pl) 2021-03-19
PL3545118T3 (pl) 2021-02-08
CN109983160B (zh) 2022-05-31
WO2018095684A1 (de) 2018-05-31

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