EP3380654A1 - Procede de depot electrolytique d'une couche de conversion sous courant alternatif - Google Patents
Procede de depot electrolytique d'une couche de conversion sous courant alternatifInfo
- Publication number
- EP3380654A1 EP3380654A1 EP16819127.8A EP16819127A EP3380654A1 EP 3380654 A1 EP3380654 A1 EP 3380654A1 EP 16819127 A EP16819127 A EP 16819127A EP 3380654 A1 EP3380654 A1 EP 3380654A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- chemical conversion
- strip
- alternating current
- conversion layer
- reaction
- 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
- 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 continuous surface treatment method of aluminum alloy.
- the surface of a metal is provided with a surface treatment in order to enhance 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 metal elements.
- the chemical conversion especially carried out with treatment agents containing chromates, especially at the oxidation state VI has been applied for a long time.
- the environmental problems associated with the use of chromium at the oxidation state VI (chromium (VI)) in the treatment solutions lead to the search for treatment agents that do not contain this element at this oxidation state.
- treating agents containing anions containing at least one element from the group consisting of zirconium, titanium, chromium at oxidation level III, cerium, vanadium, molybdenum, manganese have been developed.
- US Pat. No. 3,960,676 describes a surface treatment method 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 produced with a treatment agent containing zirconium and fluorine by cathodic electroless deposition in direct current.
- JP2003027281 discloses the use of cathodic electric current to increase the thickness of the TiO2 particle-based conversion layer.
- EPI patent application 980651 describes methods for producing colored oxides on aluminum by anodizing aluminum in an electrolyte comprising water, sulfuric acid and oxalic acid.
- the anodizing step comprises at least two sequential current densities in the electrolyte.
- the current used in the process described in patent application EPI 98065 is preferentially a constant direct current or pulsed direct current. Indeed, the use of an alternating current is generally 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 patent application EP 0318 403 also relates to the formation of anodic oxide layers.
- the anodizing 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 aluminum deposition anodizing process carried out on ferrous metal parts. In the embodiment where an alternating current is used, the voltage is from about 200 V to about 600V.
- the anode layers formed have a thickness of at least 1 ⁇ , typically between 1 and 20 ⁇ . Parts are not processed by a continuous process.
- the object of the present invention is to achieve a fast and efficient deposition of 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 of zirconium, titanium, chromium (III), cerium, vanadium, molybdenum, manganese.
- the object of the invention is a method of continuously treating an aluminum alloy strip comprising a step of forming a chemical conversion layer on the surface of the strip by reaction with a surface treatment agent.
- chemical conversion of which the pH is at most 5 comprising at least one anionic compound containing at least one metal element in the group consisting of zirconium, titanium, chromium at the oxidation degree III, cerium, vanadium, molybdenum, manganese, in which the band is subjected to an alternating current whose density is between 0.1 and 3 A / dm2, the frequency is between 40 and 70 Hz and the voltage is between 0.1 V and 40V while said reaction of treatment of chemical conversion is performed
- Figure 1 Diagram of the electrochemical cell used in the context of a first embodiment of the invention.
- Figure 2 Diagram of the electrochemical cell used in the context of a second embodiment of the invention.
- Figure 3 Evolution of the weight of the conversion layer with the density of the electric current for a contact time of 4s.
- Figure 4 Evolution of the weight of the conversion layer with the density of the electric current for a contact time of 3s.
- alloys are in accordance with the regulations of The Aluminum Association, known to those skilled in the art.
- a method of continuously treating an aluminum strip in which the strip is subjected to an alternating current makes it possible to increase the quantity deposited and / or to reduce the contact time between the treatment agent. chemical conversion and aluminum alloy strip.
- 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 treating agent comprises at least one anionic compound containing at least one metal element in 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 may in particular be a zirconium fluoride such as ZrF 6 2 " , an oxyfluorozirconate such as ZrO x F y (2 ⁇ ) - or an oxyzirconate such as ZxOi 2 ' or Zr0 4 4 ⁇ .
- the anionic compound comprises fluorine.
- the anionic compound may in particular be a titanium fluoride such as TiF 6 2 " , an oxyfluorotitanate such as TiO x F y (2 ⁇ ) - or an oxytitanate such as Ti0 3 2 " or Ti0 4 4" .
- TiF 6 2 " an oxyfluorotitanate
- TiO x F y (2 ⁇ ) - an oxytitanate
- Ti0 3 2 " or Ti0 4 4" oxytitanate
- 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 fluorine-containing compound such as, for example, hydrofluoric acid, ammonium fluoride, ammonium hydrogen fluoride, sodium fluoride and sodium hydrogen fluoride, is used in this embodiment.
- 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 treatment 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 found in the chemical conversion treatment agent is adjusted between 10 mg / l as the lower limit and 50,000 mg / l as the upper limit based on the equivalent of the metal element. In this concentration range sufficient surface protection can be achieved under satisfactory economic conditions.
- the chemical conversion treating agent mentioned above may contain another corrosion preventing material such as tannic acid, imidazoles, triazines, triazoles, guanines, hydrazines, biguanide, a phenolic resin, a silane coupling agent, colloidal silica, amines, and phosphoric acid a surfactant; a chelator; and resins.
- another corrosion preventing material such as tannic acid, imidazoles, triazines, triazoles, guanines, hydrazines, biguanide, a phenolic resin, a 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 / dm 2 and a current frequency of between 40 and 70 Hz.
- the current density is between 0.2. and 1 A / dm2 and the current frequency is between 50 and 60 Hz.
- the voltage is not specifically controlled, it is the voltage resulting from the current density conditions used and is within a range from 0.1 V to 40 V.
- the contact time between the band 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 the particular advantage of allowing a low contact time and / or increasing the amount of deposit for a low 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 performed before the step of forming a chemical conversion layer.
- the surface of the aluminum alloy strip is preferably degreased, rinsed with water after being degreased and optionally acid cleaned and rinsed with water after acid cleaning.
- Degreasing is performed to remove oily matter or stain adhering to the surface of the substrate and immersion treatment is usually conducted 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 band is only dewatered.
- a step of drying in an oven is carried out after the step of forming a chemical conversion layer and 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 and each containing an electrode (21, 22), said electrodes being subjected to said alternating current produced by a generator (2).
- the band takes a cathode polarity in one compartment and anode in the other.
- the current goes through the band itself.
- the electrochemical deposition of conversion layers according to the prior art are carried out with a cathodic polarization.
- alternating cathodic and anodic polarization nevertheless makes it possible to obtain an increase in the quantity deposited.
- the present inventors have found 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 band which in particular avoids the risk of defects related to 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 contacting roller (23) and the counterelectrode (21).
- a material of an electrode used as an electrode (21, 22) within the above process is not particularly limited so 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 achieve the formation of conversion layers on all types of aluminum alloys, particularly for the 1XXX, 3 XXX, 4XXX, 5 XXX, 6XXX and 7XXX series alloys.
- the thickness of the conversion layer obtained is advantageously less than 100 nm per side and preferably less than 50 nm per side. Typically, the thickness of the conversion layer obtained is between 8 nm and 30 nm per side.
- the aluminum alloy strips obtained by the process according to the invention are used in particular in the industry of housing, the automobile and decoration.
- An AA5052 alloy strip 220 ⁇ thick and 270mm wide was treated continuously.
- a surface preparation step was carried out by spraying a solution at 50 ° C containing sulfuric acid (6 g / l) and hydrofluoric acid adjusted to remove 0.12 g / m 2 / face and then rinsing with deionized water.
- the strip is then entered into the electrochemical cell according to FIG. 1, comprising two compartments separated by an electrically insulating partition pierced by a slot allowing the passage of the strip 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 fluoro zirconate at a concentration of 215 mg / l expressed as zirconium.
- the solution was neutralized with ammonia to obtain a pH of 3.6.
- the bath temperature was 50 ° C.
- the Zr and Ti contents of the layers were measured by X-ray fluorescence (XRF) with calibration by a blank control without conversion layer. The results are provided in Table 2.
- Figure 3 shows the increase in the average content per side of Ti and Zr when the current density is increased for a contact time of 4 seconds.
- FIG. 4 shows the increase in the average content per Ti and Zr face as the current density is increased for a contact time of 3 seconds.
- Tests 4, 5, 8 and 9 are particularly advantageous because the quantity deposited is important and the amount of Ti deposited is close to the amount of Zr deposited.
- ESCA Electro Spectroscopy for Chemical Analysis
- Test 3 was characterized as Test 3 obtained with a current of 8A.
- the analysis of an area of 100 ⁇ x 500 ⁇ was carried out using a Quantum 2000 instrument (Physical Electronics), with an X-ray beam of 100 ⁇ , 15 KV, 25 Watts at an angle of 45 °. Depth profiles after stripping under a voltage of 4KV were also performed. The results obtained are shown in Table 3
- Table 3 Surface compositions of test 3 measured by ESCA (atomic%) and chemical conversion layer thickness.
Landscapes
- 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)
- General Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Chemical Treatment Of Metals (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3380654A1 true EP3380654A1 (fr) | 2018-10-03 |
| EP3380654B1 EP3380654B1 (fr) | 2020-09-02 |
Family
ID=55182410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16819127.8A Active EP3380654B1 (fr) | 2015-11-27 | 2016-11-21 | Procede de depot electrolytique d'une couche de conversion sous courant alternatif |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP3380654B1 (fr) |
| FR (1) | FR3044329A1 (fr) |
| WO (1) | WO2017089687A1 (fr) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020148412A1 (fr) * | 2019-01-18 | 2020-07-23 | Constellium Neuf-Brisach | Traitement continu de surface de bobines constituées de feuilles d'alliages d'aluminium |
| 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 (fr) | 2019-02-15 | 2020-08-19 | Coventya GmbH | Procédé de production d'un moulage en alliage d'aluminium-silicium résistant à la corrosion, moulage en alliage d'aluminium-silicium résistant à la corrosion et son utilisation |
| 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 |
| KR20220104210A (ko) * | 2019-11-22 | 2022-07-26 | 피피지 인더스트리즈 오하이오 인코포레이티드 | 전처리 조성물의 전착 방법 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5121562B2 (fr) * | 1972-04-14 | 1976-07-03 | ||
| DE3312496A1 (de) * | 1983-04-07 | 1984-10-11 | Hoechst Ag, 6230 Frankfurt | Verfahren zur elektrochemischen aufrauhung und anodischen oxidation von aluminium und dessen verwendung als traegermaterial fuer offsetdruckplatten |
| FR2623526B1 (fr) * | 1987-11-23 | 1990-02-23 | Cegedur | Procede d'anodisation en continu de bandes en aluminium ou en un de ses alliages destinees a etre revetues d'un produit organique |
| JP3349851B2 (ja) * | 1994-12-22 | 2002-11-25 | 日本パーカライジング株式会社 | スラッジ抑制性に優れたアルミニウム含有金属材料用表面処理組成物および表面処理方法 |
| US7452454B2 (en) * | 2001-10-02 | 2008-11-18 | Henkel Kgaa | Anodized coating over aluminum and aluminum alloy coated substrates |
| US20060032760A1 (en) * | 2004-08-13 | 2006-02-16 | Fuji Photo Film Co., Ltd. | Method of manufacturing lithographic printing plate support |
| US20080274375A1 (en) * | 2007-05-04 | 2008-11-06 | Duracouche International Limited | Anodizing Aluminum and Alloys Thereof |
| US10957468B2 (en) * | 2013-02-26 | 2021-03-23 | General Cable Technologies Corporation | Coated overhead conductors and methods |
-
2015
- 2015-11-27 FR FR1561506A patent/FR3044329A1/fr not_active Ceased
-
2016
- 2016-11-21 EP EP16819127.8A patent/EP3380654B1/fr active Active
- 2016-11-21 WO PCT/FR2016/053033 patent/WO2017089687A1/fr not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| EP3380654B1 (fr) | 2020-09-02 |
| WO2017089687A1 (fr) | 2017-06-01 |
| FR3044329A1 (fr) | 2017-06-02 |
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