EP3126542A1 - Zweistufen-vorbehandlung von aluminium umfassend beize und passivierung - Google Patents
Zweistufen-vorbehandlung von aluminium umfassend beize und passivierungInfo
- Publication number
- EP3126542A1 EP3126542A1 EP15712948.7A EP15712948A EP3126542A1 EP 3126542 A1 EP3126542 A1 EP 3126542A1 EP 15712948 A EP15712948 A EP 15712948A EP 3126542 A1 EP3126542 A1 EP 3126542A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pickling solution
- passivation
- mmol
- pickling
- aluminum
- 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
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
- C23C22/06—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
-
- 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
- C23C22/76—Applying the liquid by spraying
-
- 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
- C23C22/78—Pretreatment of the material to be coated
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/12—Light metals
- C23G1/125—Light metals aluminium
-
- 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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
- C23G5/02—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents
- C23G5/028—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing halogenated hydrocarbons
- C23G5/02854—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents using organic solvents containing halogenated hydrocarbons characterised by the stabilising or corrosion inhibiting additives
- C23G5/02861—Oxygen-containing compounds
- C23G5/02864—Alcohols
Definitions
- the present invention relates to a process for the corrosion-protective treatment of aluminum-made components comprising a pretreatment stage and a subsequent coating.
- the passivation of the pretreatment stage involves contacting the components with an acidic aqueous composition based on water-soluble compounds of the elements Zr and / or Ti. Pickling and passivation are coordinated such that a subsequent addition of active components of the passivation solution to substantial parts from the Pickling solution can be done.
- the aluminum surface is freed in a first step by the natural or caused by the manufacturing process oxide layer by pickling or pickling.
- the pickling not only involves the removal of the oxide layer, but typically includes pickling of the aluminum-made component itself to provide a homogeneous reproducible metallic surface for subsequent passivation.
- pickling More recently, there has been a growing demand for pretreatments in the industrial mass production of components made of aluminum, in which the use of compounds of the element chromium can be completely dispensed with for improved environmental compatibility and sustainability.
- the international publication WO 00/68458 A1 describes for the pretreatment of aluminum-made components suitable three-stage process consisting of acidic pickle, a sink and an acidic passivation based on the elements Zr and / or Ti, the sink between pickling and passivation preferably from more
- Transport direction of the component is performed.
- the object of the present invention is now to optimize the pre-treatment stage for aluminum-made components in subsequent painting with respect to the procedural measures to maintain a satisfactory result of the pretreatment in the continuous operation of such a pretreatment stage and beyond the complexity of
- This object is achieved in a process for the corrosion-protective treatment of aluminum-made components comprising a pretreatment stage and a
- aqueous pickling solution having a pH of 1 to 3, a free acid content in points of at least 8 and a total fluoride content of at least 40 mmol / L, and then with an aqueous passivating solution, which has a pH of 1 to 3, a free acid content in points below 8 and a
- Total fluoride content of less than 60 mmol / L, but at least 5 mmol / L and less than 10 mmol / L, but at least 0, 1 mmol / L of water-soluble compounds of the elements Zr and / or Ti based on the respective element is brought into contact, wherein in the pretreatment stage, immediately after contacting with the pickling solution, the contacting is carried out with the passivation solution.
- are treated corrosion-protective are those whose surface formed of metallic substrates to at least 80%, preferably at least 90%, more preferably at least 95% surfaces of the substrate aluminum and / or its alloys, wherein alloys of the metal aluminum according to the invention more than 50 At .-% consist of the element aluminum. It is further preferred that the
- Surface of the substrate aluminum contains no conversion layer with a coating weight of more than 10 mg / m2 based on such foreign elements whose component in the substrate aluminum is below 1 At .-%.
- Suitable components made of aluminum in the method according to the invention are selected, for example, from semi-finished products such as sheet metal, strip, coil or wire or from complex three-dimensional production objects, which in turn are formed from strip material or sheets and / or are assembled or produced by die-casting.
- a pretreatment stage is a process stage separate from the application of the coating, comprising the pickling and passivation steps which are separated from each other with the aid of liquid compositions in the form of the pickling solution, the passivation solution, which are each stored independently in system tanks.
- the components made of aluminum are pretreated in series in the pretreatment stage of the process according to the invention.
- Passivitationslosung in the context of the present invention is interposed. Moreover, in a preferred process according to the invention between pickling and passivation, no such process step takes place in which the provision and use of technical means is intended to dry or remove the aqueous liquid film adhering to the surface of the component, in particular by supplying thermal energy an air flow or by mechanical stripping of the liquid film.
- the passivation immediately following the pickling is carried out "wet-on-wet", i.e. in such a way that a wet film adhering to the surface of the component of a liquid composition, which constitutes a pickling solution in the sense of the present invention, is included in the
- Passivitationslosung result or be accepted.
- the ratio of per minute pretreated surface of aluminum-made non-exhaustive components in square meters to vorratetem volume of Passivi mecanicslosung in cubic meters at least 10, particularly preferred at least 50.
- Non-constituent components are characterized in that they do not transfer more than 1 liter of the pickling solution per square meter of the pickled component surface into the passivation solution, for example flat products such as strips, sheets or wires.
- the free acid content in points is determined in the context of the present invention by diluting 10 ml of the pickling solution to 50 ml and titrating with 0.1 N sodium hydroxide solution to a pH of 3.6. The consumption of milliliters of caustic soda indicates the score.
- the stain has a free acid content of at least 12 points, so that a pickling removal which is largely independent of the type of aluminum material to be treated and sufficient for the subsequent passivation is ensured, for example in US Pat
- the free acid content in points should preferably not be greater than 16, in order to be able to keep the metal salt load in the pickling still at a moderate level with procedurally acceptable expense.
- the total acid content of importance and this is in the pickling solution of the method according to the invention preferably at least 15 points, but preferably not more than 20 points.
- Total acid content is inventively determined analogously to the free acid with the
- the pickling solution preferably has a pH below 2.0 in a process according to the invention. Even then it is regularly ensured that a sufficient stain can take place in the pretreatment stage.
- Acidic acid to be used has been found to be preferable to sulfuric acid. Accordingly, preference is given in the process according to the invention to the use of pickling solutions whose total acid content is formed in points of 80%, particularly preferably 90%, particularly preferably 95%, by means of sulfuric acid.
- a further prerequisite for a sufficient pickling effect of the components made of aluminum in the pickling solution of the pretreatment stage of the process according to the invention is the presence of fluorides which, as complexing agents for aluminum ions, on the one hand stain oxidic cover layers and, on the other hand, the high load of aluminum ions in the Stabilize pickling solution.
- fluorides which, as complexing agents for aluminum ions
- Total fluoride content in the pickling solution is at least 60 mmol / L.
- the total fluoride content is determined in the context of the present invention by means of a fluoride ion-sensitive electrode according to DIN 38 405-D-4-1.
- the pickling solution to meet this requirement profile in a preferred method according to the invention has to contain at least 7 mmol / L of water-soluble compounds of the elements Zr and / or Ti relative to the respective element to the debris for de n be able to make significant use of the replacement of the components of these components consumed in the passivation solution.
- Conversion layer formation based on the elements Zr and / or Ti is possible.
- it is preferred according to the invention if no more than 30 mmol / L of water-soluble compounds of the elements Zr and / or Ti are contained in such pickling solutions, based on the respective element.
- the pickling solution is less than 0, 1.
- the pickling solution additionally contains a surface-active organic compound, more preferably a nonionic surfactant, wherein the proportion of surface-active organic substances in the pickling solution is preferably at least 0.1 mmol / L.
- preference is generally given to those nonionic surfactants whose HLB value (hydrophilic-lipophilic balance) is at least 8, more preferably at least 10, particularly preferably at least 12, but is particularly preferably not more than 18, particularly preferably not more than 16.
- the HLB value is used to quantitatively classify nonionic surfactants according to their internal molecular structure, with a breakdown of the nonionic surfactant into a lipophilic and a hydrophilic group.
- the HLB value may take on the arbitrary scale values of zero to 20 and is calculated according to the present invention as follows:
- HLB 20- (1-M L / M)
- Particularly suitable nonionic surfactants are selected from alkoxylated alkyl alcohols, alkoxylated fatty amines and / or alkylpolyglycosides, more preferably from alkoxylated alkyl alcohols and / or alkoxylated fatty amines, particularly preferably from alkoxylated alkyl alcohols.
- the alkoxylated alkyl alcohols and / or alkoxylated fatty amines are preferably end-capped, particularly preferably having an alkyl group which in turn preferably has not more than 8 carbon atoms, more preferably not more than 4 carbon atoms.
- the pickling solution in the present process is preferably set such that, for the wrought alloy EN AW 6060 (AIMgSiO, 5) at 40 ° C in an unstirred etching solution of the present process s "results in a pickling rate of at least 15 mgnr 2 1, based on the element aluminum ,
- a conversion layer based on the elements Zr and / or Ti is applied in the method according to the invention.
- a sufficient passivation is preferred if after passivation a
- RFA X-ray fluorescence analysis
- Passivation is furthermore preferred if the molar ratio of the total proportion of water-soluble compounds of the elements Zr and / or Ti relative to the respective elements to the total fluoride content in the passivation solution is at least 0.1, more preferably at least 0.4.
- the pH of the passivation solution in the pretreatment stage is at least 1.8, more preferably at least 2.0.
- the passivation solution therefore contains a total of less than 10 ppm of water-soluble compounds of the element chromium calculated as Cr.
- the application of the pickling and passivating solution stored in the respective system tanks of the pretreatment stage can be carried out using all methods known in the prior art, with immersion and spraying methods for contacting the components made of aluminum with these solutions being particularly preferred is the spray method as application mode.
- the coating following the pretreatment stage according to the invention comprises the application of a composition containing a chemical or physical
- hardening binder for forming a cover layer on the pretreated and made of aluminum component, wherein the coating layer resulting from the coating in the dried or cured state, a layer thickness of preferably at least one micrometer, more preferably of at least 10 ⁇ , measured according to
- Suitable lacquers are autophoretic lacquers, electrodeposition lacquers, powder lacquers and liquid lacquers which can be applied by conventional means.
- binders used according to the invention both paints based on inorganic binders such as
- Binders are used. According to the invention, the following application of lacquers based on organic binders, especially those which are particularly advantageous, is particularly advantageous contain less than 10 wt .-% of organic solvent constituents, the one
- powder coatings are preferred, in particular those with binders based on epoxy resins, carboxyl- and hydroxyl-containing polyester resins and / or acrylate resins, each having an excellent paint adhesion to the pretreated according to the invention made of aluminum components.
- the component made of aluminum can be subjected after the pretreatment and before the painting of a sink, which serves to remove an adhering to the surface wet film of Passivitationslosung before the paint is applied. Furthermore, it is customary that the component is dried before the application of the paint. This is especially the case when a powder coating is to be applied.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL15712948T PL3126542T3 (pl) | 2014-04-03 | 2015-03-31 | Dwuetapowa obróbka wstępna aluminium obejmująca wytrawianie i pasywację |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102014206407.4A DE102014206407A1 (de) | 2014-04-03 | 2014-04-03 | Zweistufen-Vorbehandlung von Aluminium umfassend Beize und Passivierung |
| PCT/EP2015/057035 WO2015150387A1 (de) | 2014-04-03 | 2015-03-31 | Zweistufen-vorbehandlung von aluminium umfassend beize und passivierung |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3126542A1 true EP3126542A1 (de) | 2017-02-08 |
| EP3126542B1 EP3126542B1 (de) | 2018-03-14 |
Family
ID=52774252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP15712948.7A Active EP3126542B1 (de) | 2014-04-03 | 2015-03-31 | Zweistufen-vorbehandlung von aluminium umfassend beize und passivierung |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US10415140B2 (de) |
| EP (1) | EP3126542B1 (de) |
| CN (1) | CN106232871B (de) |
| DE (1) | DE102014206407A1 (de) |
| ES (1) | ES2665193T3 (de) |
| MX (1) | MX378912B (de) |
| PL (1) | PL3126542T3 (de) |
| PT (1) | PT3126542T (de) |
| TW (1) | TWI665336B (de) |
| WO (1) | WO2015150387A1 (de) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3456864B1 (de) * | 2017-09-18 | 2019-11-13 | Henkel AG & Co. KGaA | Zweistufen-vorbehandlung von aluminium, insbesondere aluminiumgusslegierungen, umfassend beize und konversionsbehandlung |
| CN113699533A (zh) * | 2021-08-27 | 2021-11-26 | 海盐卫士标准件有限公司 | 一种金属表面高效酸洗工艺及设备 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1997013005A1 (en) * | 1995-10-06 | 1997-04-10 | Henkel Corporation | Metal cleaning process with improved draining uniformity |
| DE19921842A1 (de) | 1999-05-11 | 2000-11-16 | Metallgesellschaft Ag | Vorbehandlung von Aluminiumoberflächen durch chromfreie Lösungen |
| DE10110834B4 (de) * | 2001-03-06 | 2005-03-10 | Chemetall Gmbh | Verfahren zur Beschichtung von metallischen Oberflächen und Verwendung der derart beschichteten Substrate |
| DE10322446A1 (de) * | 2003-05-19 | 2004-12-09 | Henkel Kgaa | Vorbehandlung von Metalloberflächen vor einer Lackierung |
| DE10358310A1 (de) * | 2003-12-11 | 2005-07-21 | Henkel Kgaa | Zweistufige Konversionsbehandlung |
| CN100545308C (zh) * | 2007-11-22 | 2009-09-30 | 东北大学 | 一种用于处理铝合金的无铬钝化液及其使用方法 |
| DE102008038653A1 (de) * | 2008-08-12 | 2010-03-25 | Henkel Ag & Co. Kgaa | Sukzessive korrosionsschützende Vorbehandlung von Metalloberflächen in einem Mehrstufenprozess |
| DE102009047522A1 (de) * | 2009-12-04 | 2011-06-09 | Henkel Ag & Co. Kgaa | Mehrstufiges Vorbehandlungsverfahren für metallische Bauteile mit Zink- und Eisenoberflächen |
-
2014
- 2014-04-03 DE DE102014206407.4A patent/DE102014206407A1/de not_active Ceased
-
2015
- 2015-03-31 EP EP15712948.7A patent/EP3126542B1/de active Active
- 2015-03-31 ES ES15712948.7T patent/ES2665193T3/es active Active
- 2015-03-31 CN CN201580020911.3A patent/CN106232871B/zh active Active
- 2015-03-31 PT PT157129487T patent/PT3126542T/pt unknown
- 2015-03-31 PL PL15712948T patent/PL3126542T3/pl unknown
- 2015-03-31 MX MX2016012679A patent/MX378912B/es unknown
- 2015-03-31 WO PCT/EP2015/057035 patent/WO2015150387A1/de not_active Ceased
- 2015-04-02 TW TW104110866A patent/TWI665336B/zh active
-
2016
- 2016-09-29 US US15/279,929 patent/US10415140B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| MX2016012679A (es) | 2016-12-14 |
| US20170016119A1 (en) | 2017-01-19 |
| PT3126542T (pt) | 2018-03-22 |
| TW201602414A (zh) | 2016-01-16 |
| EP3126542B1 (de) | 2018-03-14 |
| US10415140B2 (en) | 2019-09-17 |
| MX378912B (es) | 2025-03-10 |
| TWI665336B (zh) | 2019-07-11 |
| DE102014206407A1 (de) | 2015-10-08 |
| ES2665193T3 (es) | 2018-04-24 |
| CN106232871A (zh) | 2016-12-14 |
| CN106232871B (zh) | 2019-03-01 |
| PL3126542T3 (pl) | 2018-09-28 |
| WO2015150387A1 (de) | 2015-10-08 |
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Inventor name: JOHN-SCHILLINGS, THOMAS Inventor name: BENDER, ANDREAS RICHARD Inventor name: KRUEGERMANN, INA Inventor name: SOLDATI, ANDREA Inventor name: VAN DE CAPPELLE, MATHIEU |
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