EP3380654B1 - Verfahren für elektrodeposition einer umwandlungsbeschichtung unter wechselstrom - Google Patents

Verfahren für elektrodeposition einer umwandlungsbeschichtung unter wechselstrom Download PDF

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EP3380654B1
EP3380654B1 EP16819127.8A EP16819127A EP3380654B1 EP 3380654 B1 EP3380654 B1 EP 3380654B1 EP 16819127 A EP16819127 A EP 16819127A EP 3380654 B1 EP3380654 B1 EP 3380654B1
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Prior art keywords
chemical conversion
strip
carried out
alternating current
comprised
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English (en)
French (fr)
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EP3380654A1 (de
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Jean-Sylvestre Safrany
Bernard Grindatto
Matthieu Boehm
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Constellium Neuf Brisach SAS
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Constellium Neuf Brisach SAS
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/08—Electrolytic coating other than with metals with inorganic materials by cathodic processes
    • C25D9/12—Electrolytic coating other than with metals with inorganic materials by cathodic processes on light metals
    • 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
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/024—Anodisation under pulsed or modulated current or potential
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/06—Anodisation of aluminium or alloys based thereon characterised by the electrolytes used
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/005—Contacting devices
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/06—Electrolytic coating other than with metals with inorganic materials by anodic processes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/02—Tanks; Installations therefor

Definitions

  • the present invention relates to a process for the continuous treatment of an aluminum alloy surface.
  • the surface of a metal is provided with a surface treatment for the purpose of enhancing characteristics such as corrosion resistance and the like.
  • a surface treatment for the purpose of enhancing characteristics such as corrosion resistance and the like.
  • the formation of conversion layers is known in which the initial passive film is replaced by a passivation film comprising other protective metallic elements.
  • the chemical conversion carried out in particular with treatment agents containing chromates, in particular at oxidation degree VI has been applied for a long time.
  • the environmental problems linked to the use of chromium at oxidation degree VI (chromium (VI)) in treatment solutions have led to a search for treatment agents which do not contain this element at this oxidation degree.
  • Treatment agents have thus been developed containing anions containing at least one element from the group consisting of zirconium, titanium, chromium in oxidation degree III, cerium, vanadium, molybdenum, manganese.
  • the deposition rate carried out with these new treatment agents is often low, which poses in particular the problem of productivity of the treatment lines.
  • the patent US 3,960,676 describes a surface treatment process using direct or alternating current in a medium with a pH greater than 6 for compounds of the silicates, borates, phosphates, chromates, molybdates, vanadates and permanganates type.
  • the patent application EP 1,486,585 describes a method of metal surface treatment in which a conversion layer is made with a treating agent containing zirconium and fluorine by direct current cathodic electroplating.
  • the patent application JP2003027281 describes the use of a cathodic electric current to increase the thickness of the layer of conversions based on TiO2 particles.
  • the patent application EP1980651 describes methods for producing colored oxides on aluminum by anodizing aluminum in an electrolyte comprising water, sulfuric acid and oxalic acid.
  • the anodizing step includes at least two sequential current densities in the electrolyte.
  • the current used in the process described in the patent application EP1980651 is preferably a constant direct current or a pulsed direct current. Indeed, the use of an alternating current is in general not favorable to the formation of an anodic oxide layer because the layer dissolves during the cathode phase.
  • the oxide layer obtained in anodization is essentially derived from the aluminum itself, not from the electrolyte.
  • the thickness of the anode oxide layers obtained is thus of the order of 15 to 100 microns.
  • the oxide layer obtained is essentially derived from the electrolyte and the thickness is much smaller, less than 0.1 ⁇ m.
  • the pH of the solutions of the patent EP1980651 is certainly less than 2 taking into account the sulfuric acid concentrations indicated.
  • a person skilled in the art distinguishes without hesitation an anodic oxide layer and a conversion layer.
  • the distinction between chemical conversion and oxide formation by anodization is part of the general technical knowledge of those skilled in the art. So in the reference manual "The surface treatment and finishing of Aluminum and its alloys", S. Wernick and R.Pinner, Robert Drapper LTD, Teddington, 1964, 3rd Editi on, chapter 5 is devoted to chemical conversion layers and chapters 6 to 12 to anodizing.
  • the difference in thickness of the films obtained is for example explained on page 194 of this book.
  • the patent application EP 0318 403 also relates to the formation of anodic oxide layers.
  • the anodization conditions described in this patent application contain in particular a high current density of at least 8 A / dm 2 .
  • the patent application US2005 / 115839 relates to an anodizing process for aluminum deposition carried out on parts made of ferrous metals. In the embodiment where alternating current is used, the voltage is about 200V to about 600V.
  • the anode layers formed have a thickness of at least 1 ⁇ m, typically between 1 and 20 ⁇ m in a bath of pH between 2.5 and 5.5. The parts are not processed by a continuous processing process.
  • the patent application WO 96/19595 describes a highly corrosion resistant, paint-adherent, conversion coating formed on the surface of aluminous metal substrates by contacting these surfaces for 0.5-60 seconds with a water-based surface treatment bath without sludge which has a pH of 1.5 to 4.0 and contains a zirconium compound, a phosphoric acid compound, an oxidizing agent and a compound which is a source of hydrogen fluoride. This contact is preferably followed by rinsing with water and drying. No electric current is applied.
  • the aim of the present invention is to achieve a rapid and efficient deposition of a chemical conversion layer on a continuous line by a reaction with a chemical conversion treatment agent comprising at least one anionic compound containing at least one element in the group consisting of zirconium, titanium, chromium (III), cerium, vanadium, molybdenum, manganese.
  • the object of the invention is a process for the continuous treatment of an aluminum alloy strip (3) comprising a step of forming a chemical conversion layer on the surface of the strip (3) by a reaction with a chemical conversion treatment agent whose pH is maintained between 2 and 4 comprising at least one anionic compound containing at least one metallic element in the group consisting of zirconium, titanium, chromium in oxidation degree III, cerium, vanadium, molybdenum, manganese, in which the strip (3) is subjected to an alternating current whose density is between 0.1 and 3 A / dm2, the frequency is between 40 and 70Hz and the voltage is between 0.1V and 40V while said chemical conversion treatment reaction is carried out, wherein the thickness of the obtained conversion layer is less than 50nm per face.
  • the designation of the alloys is made in accordance with the regulations of The Aluminum Association, known to those skilled in the art.
  • a continuous treatment method of a strip (3) of aluminum in which the strip (3) is subjected to an alternating current makes it possible to increase the quantity deposited and / or to reduce the contact time. between the chemical conversion treatment agent and the aluminum alloy strip (3).
  • the oxide layer obtained is derived from the aluminum itself, not from the electrolyte
  • the oxide layer obtained is essentially derived from the electrolyte.
  • the treatment agent comprises at least one anionic compound containing at least one metallic element from the group consisting of zirconium, titanium, chromium (III), cerium, vanadium, molybdenum, manganese.
  • the anionic compound is a fluorinated and / or oxidized and / or phosphated compound.
  • the anionic compound can in particular be a zirconium fluoride such as ZrF 6 2- , an oxyfluorozirconate such as ZrO x F y (2x-y-4) - or an oxyzirconate such as Z F O 3 2- or ZrO 4 4- .
  • the anionic compound comprises fluorine.
  • the anionic compound can in particular be a titanium fluoride such as TiF 6 2- , an oxyfluorotitanate such as TiO x F y (2x-y-4) - or an oxytitanate such as TiO 3 2- or T 1 O 4 4- .
  • TiF 6 2- an oxyfluorotitanate
  • TiO x F y (2x-y-4) - or an oxytitanate such as TiO 3 2- or T 1 O 4 4- .
  • the anionic compound contains zirconium and / or titanium and / or fluorine.
  • the pH of said chemical conversion treatment agent is maintained between 2 and 4 and preferably between 3 and 4.
  • a compound containing fluorine such as, for example, hydrofluoric acid, ammonium fluoride, ammonium hydrogen fluoride, sodium fluoride and sodium hydrogen fluoride, are used in particular in this embodiment.
  • fluorine such as, for example, hydrofluoric acid, ammonium fluoride, ammonium hydrogen fluoride, sodium fluoride and sodium hydrogen fluoride.
  • compounds can be used alone or in combination of two or more species.
  • a method of adjusting the pH by adding nitric acid or ammonium hydroxide to the process bath while measuring the pH using a pH meter is also advantageous.
  • the total concentration of anionic compound in the group consisting of zirconium, titanium, chromium (III), cerium, vanadium, molybdenum, manganese in the chemical conversion treatment agent is adjusted between 10 mg / l as a lower limit and 50,000 mg / l as an upper limit based on the equivalent of the metallic element. In this concentration range sufficient protection of the surface can be obtained under satisfactory economic conditions.
  • the above-mentioned chemical conversion treatment agent may contain other anti-cancer material. corrosion such as tannic acid, imidazoles, triazines, triazoles, guanines, hydrazines, biguanide, phenolic resin, silane coupling agent, colloidal silica, amines, and phosphoric acid a surfactant; a chelator; and resins.
  • corrosion such as tannic acid, imidazoles, triazines, triazoles, guanines, hydrazines, biguanide, phenolic resin, silane coupling agent, colloidal silica, amines, and phosphoric acid a surfactant; a chelator; and resins.
  • the alternating current used in the context of the present invention has a current density of between 0.1 and 3 A / dm2 and a current frequency of between 40 and 70 Hz.
  • the current density is between 0.2 and 1 A / dm2 and the frequency of the current is between 50 and 60 Hz.
  • the voltage is not specifically controlled, it is the voltage resulting from the conditions of current density used and is within 'a range from 0.1 V to 40 V.
  • the contact time between the strip (3) and the treatment agent is between 0.1 and 15 seconds, preferably between 1 and 10 seconds and preferably between 2 and 5 seconds.
  • the invention has in particular the advantage of allowing a short contact time and / or of increasing the quantity of deposit for a short contact time.
  • the temperature of the chemical conversion treatment agent is typically between 10 and 80 ° C, preferably between 20 and 70 ° C.
  • a surface preparation step is carried out before the step of forming a chemical conversion layer.
  • the surface of the strip (3) made of aluminum alloy is preferably degreased, rinsed with water after having been degreased and optionally cleaned with acid and rinsed with water after cleaning with acid.
  • Degreasing is carried out to remove an oily material or a stain adhering to the surface of the substrate and an immersion treatment is usually carried out at a temperature of 30 to 55 ° C using a degreasing agent such as an acidic cleaning liquid or basic.
  • rinsing can be carried out with preferably demineralized water.
  • the strip (3) is only wrung out.
  • a drying step in an oven is carried out after the step of forming a chemical conversion layer and the optional rinsing.
  • the chemical conversion treatment reaction is carried out in an electrochemical cell (1) comprising at least two compartments (11, 12) preferably separated by an electrically insulating partition (13) pierced by a slot (131) allowing the passage of the strip (3) and each containing an electrode (21, 22), the said electrodes being subjected to said alternating current produced by a generator (2).
  • the strip (3) takes a cathodic polarity in one compartment and anodic in the other.
  • the current passes through the strip (3) itself.
  • the electrochemical deposits of conversion layers according to the prior art are carried out with cathodic polarization. Surprisingly, the alternation of cathodic and anodic polarization nevertheless makes it possible to obtain an increase in the quantity deposited.
  • the present inventors have observed that the use of an alternating current is particularly advantageous because it makes it possible to use the current delivered industrially without the need for a rectifier.
  • This embodiment is advantageous because there is no direct contact between the electrodes and the strip (3) which in particular avoids the risk of faults associated with the contacts.
  • the electrical contact is made using a contact roller (23).
  • the chemical conversion treatment reaction is carried out in an electrochemical cell (1) and containing at least one electrode (21), an alternating current produced by a generator (2) being applied between the contact roller (23) and the counter electrode (21).
  • a material of an electrode used as an electrode (21, 22) in the above processing is not particularly limited as long as the electrode does not dissolve in the chemical conversion processing agent and for example, stainless steel, titanium plated with platinum, titanium plated with niobium, carbon, iron, nickel and zinc can be used.
  • the material of the electrode (21,22) is graphite.
  • the process according to the invention is used to carry out the formation of conversion layers on all types of aluminum alloys, particularly for the alloys of the 1XXX, 3XXX, 4XXX, 5XXX, 6XXX and 7XXX series.
  • the thickness of the conversion layer obtained is less than 50 nm per face. Typically, the thickness of the conversion layer obtained is between 8 nm and 30 nm per face.
  • the aluminum alloy strips (3) obtained by the process according to the invention are used in particular in the boxing, automotive and decoration industry.
  • a chemical conversion layer was carried out by the process according to the invention.
  • a strip (3) of AA5052 alloy 220 ⁇ m thick and 270mm wide was continuously treated.
  • a surface preparation step was carried out by sprinkling a solution at 50 ° C containing sulfuric acid (6 g / l) and hydrofluoric acid adjusted so as to remove 0.12 g / m 2 / face then rinsing with deionized water.
  • the strip (3) is then entered into the electrochemical cell according to the Figure 1 , comprising two compartments separated by an electrically insulating partition pierced by a slot allowing the passage of the strip (3) and each containing an electrode.
  • the submerged length was 40 cm per compartment.
  • the bath used in the electrochemical cell was a bath containing fluo-titanate anions at a concentration of 100 mg / l expressed as titanium and fluo-zirconate at a concentration of 215 mg / l expressed as zirconium.
  • the solution had been neutralized with ammonia to obtain a pH of 3.6.
  • the bath temperature was 50 ° C.
  • Table 1 Test conditions Trial Contact time Intensity (A) Voltage (V) Current density (A / dm2) 1 - Reference 4s 0 0 0 2 - Invention 4s 3.1 4 0.139 3 - Invention 4s 4 5.1 0.185 4 - Invention 4s 8 10.1 0.370 5 - Invention 4s 16 20.2 0.740 6 - Reference 3s 0 0 0 7 - Invention 3s 4 5.1 0.185 8 - Invention 3s 8 10.1 0.370 9 - Invention 3s 16 20.8 0.740
  • the excess bath is removed by a wringing roller at the outlet of the electrochemical cell.
  • the layer obtained is dried at 100 ° C.
  • the Zr and Ti contents of the layers were measured by X-ray fluorescence (XRF) with calibration by a white control without conversion layer. The results are provided in Table 2.
  • Table 2 Quantities of Zr and Ti deposited, measured by X-ray fluorescence.
  • the figure 3 shows the increase in the average content per face of Ti and Zr when the current density is increased for a contact time of 4 seconds.
  • the figure 4 shows the increase in the average content per face Ti and Zr when the current density is increased for a contact time of 3 seconds.
  • Tests 4, 5, 8 and 9 are particularly advantageous because the amount deposited is large and the amount of Ti deposited is close to the amount of Zr deposited.
  • Test 3 obtained with a current of 8A was characterized by ESCA (Electron Spectroscopy for Chemical Analysis). The analysis of an area of 100 ⁇ m x 500 ⁇ m was carried out using a Quantum 2000 instrument (Physical Electronics), with an X-ray beam of 100 ⁇ m, 15 KV, 25 Watts at an angle of 45 °. Depth profiles after stripping under a voltage of 4KV were also carried out. The results obtained are presented in Table 3 Table 3: Surface compositions of test 3 measured by ESCA (atomic%) and thickness of chemical conversion layer. VS NOT O F Mg Al Yes P Ti Zr Thickness (nm) Upper side 33 0.9 48 2.2 0.5 4.9 0.6 1.3 5.4 3.1 16 Lower side 28 1.5 50 2.0 0.4 4.5 0.6 4.0 7.3 1.7 15

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • Inorganic Chemistry (AREA)
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  • Other Surface Treatments For Metallic Materials (AREA)

Claims (9)

  1. Verfahren zur kontinuierlichen Behandlung eines Bandes (3) aus einer Aluminiumlegierung, umfassend einen Schritt zur Bildung einer chemischen Umwandlungsschicht auf der Oberfläche des Bandes (3) durch eine Reaktion mit einem chemischen Umwandlungsbehandlungsmittel, dessen pH-Wert zwischen 2 und 4 gehalten wird, aufweisend mindestens eine anionische Verbindung, die mindestens ein metallisches Element aus der Gruppe bestehend aus Zirkonium, Titan, Chrom in der Oxidationsstufe III, Cer, Vanadium, Molybdän, Mangan enthält, wobei das Band (3) einem Wechselstrom mit einer Dichte von 0,1 bis 3 A/dm2, einer Frequenz von 40 bis 70 Hz und einer Spannung von 0,1 V bis 40 V ausgesetzt wird, während die chemische Umwandlungsbehandlungsreaktion durchgeführt wird, und wobei die Dicke der erhaltenen Umwandlungsschicht weniger als 50 nm pro Seite beträgt.
  2. Verfahren nach Anspruch 1, wobei die Kontaktzeit zwischen dem Band (3) und dem Behandlungsmittel 0,1 bis 15 Sekunden, vorzugsweise 1 bis 10 Sekunden und weiter bevorzugt 2 bis 5 Sekunden beträgt.
  3. Verfahren nach Anspruch 1 oder Anspruch 2, wobei die anionische Verbindung Zirkonium und/oder Titan und/oder Fluor enthält.
  4. Verfahren nach Anspruch 3, wobei der pH-Wert des chemischen Umwandlungsbehandlungsmittels zwischen 3 und 4 gehalten wird.
  5. Verfahren nach irgendeinem der Ansprüche 1 bis 4, wobei die Dicke der erhaltenen Umwandlungsschicht 8 nm bis 30 nm pro Seite beträgt.
  6. Verfahren nach irgendeinem der Ansprüche 1 bis 5, wobei vor dem Schritt zur Bildung einer chemischen Umwandlungsschicht ein Oberflächenvorbereitungsschritt durchgeführt wird.
  7. Verfahren nach irgendeinem der Ansprüche 1 bis 6, wobei nach dem Schritt zur Bildung einer chemischen Umwandlungsschicht ein Trocknungsschritt in einem Ofen durchgeführt wird.
  8. Verfahren nach irgendeinem der Ansprüche 1 bis 7, wobei die chemische Umwandlungsbehandlungsreaktion in einer elektrochemischen Zelle (1) durchgeführt wird, die mindestens zwei Kammern (11, 12) aufweist, die vorzugsweise durch eine elektrisch isolierende Trennwand (13), welche von einem Schlitz (131) durchbrochen ist, der den Durchgang des Bandes (3) ermöglicht, voneinander getrennt sind und die jeweils mindestens eine Elektrode (21, 22) enthalten, wobei die Elektroden dem von einem Generator (2) erzeugten Wechselstrom ausgesetzt werden.
  9. Verfahren nach irgendeinem der Ansprüche 1 bis 7, wobei die chemische Umwandlungsbehandlungsreaktion in einer elektrochemischen Zelle (1) durchgeführt wird, die mindestens eine Elektrode (21) enthält, wobei ein von einem Generator (2) erzeugter Wechselstrom zwischen einer Kontaktwalze (23) und der Elektrode (21) angelegt wird.
EP16819127.8A 2015-11-27 2016-11-21 Verfahren für elektrodeposition einer umwandlungsbeschichtung unter wechselstrom Active EP3380654B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1561506A FR3044329A1 (fr) 2015-11-27 2015-11-27 Procede de depot electrolytique d'une couche de conversion sous courant alternatif
PCT/FR2016/053033 WO2017089687A1 (fr) 2015-11-27 2016-11-21 Procede de depot electrolytique d'une couche de conversion sous courant alternatif

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EP3380654B1 true EP3380654B1 (de) 2020-09-02

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WO2020148412A1 (en) * 2019-01-18 2020-07-23 Constellium Neuf-Brisach Continuous surface treatment for coils made of aluminum alloys sheets
FR3091880B1 (fr) * 2019-01-18 2022-08-12 Constellium Neuf Brisach Traitement de surface en continu des bobines réalisées à partir de tôles d’alliages d’aluminium
EP3696299A1 (de) 2019-02-15 2020-08-19 Coventya GmbH Verfahren zur herstellung eines korrosionsbeständigen aluminium-silicium-legierungs-gusses, korrosionsbeständiger aluminium-silicium-legierungs-guss und dessen verwendung
CN110241453A (zh) * 2019-04-25 2019-09-17 西南大学 一种缓释氟和铈的可降解锌合金骨钉及其制备方法
WO2021102413A1 (en) * 2019-11-22 2021-05-27 Ppg Industries Ohio, Inc. Methods for electrolytically depositing pretreatment compositions

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