EP3652363A1 - Produit laminé en alliage d'aluminium à couleurs iridescentes intenses - Google Patents

Produit laminé en alliage d'aluminium à couleurs iridescentes intenses

Info

Publication number
EP3652363A1
EP3652363A1 EP18735324.8A EP18735324A EP3652363A1 EP 3652363 A1 EP3652363 A1 EP 3652363A1 EP 18735324 A EP18735324 A EP 18735324A EP 3652363 A1 EP3652363 A1 EP 3652363A1
Authority
EP
European Patent Office
Prior art keywords
oxide film
anodic oxide
porous anodic
rolled product
solution
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP18735324.8A
Other languages
German (de)
English (en)
Other versions
EP3652363B1 (fr
Inventor
Jean-Sylvestre Safrany
David FAIHY
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Constellium Rolled Products Singen GmbH and Co KG
Original Assignee
Constellium Rolled Products Singen GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Constellium Rolled Products Singen GmbH and Co KG filed Critical Constellium Rolled Products Singen GmbH and Co KG
Publication of EP3652363A1 publication Critical patent/EP3652363A1/fr
Application granted granted Critical
Publication of EP3652363B1 publication Critical patent/EP3652363B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • 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
    • C25D11/20—Electrolytic after-treatment
    • C25D11/22—Electrolytic after-treatment for colouring 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
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/18—After-treatment, e.g. pore-sealing
    • C25D11/24—Chemical after-treatment
    • C25D11/243—Chemical after-treatment using organic dyestuffs
    • 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
    • C25D11/24—Chemical after-treatment
    • C25D11/246—Chemical after-treatment for sealing layers

Definitions

  • the present invention relates to decorative aluminium rolled products having iridescent colors.
  • aluminium alloys are used in the form of rolled products for decorative applications such as cosmetic packaging, automotive trims (exterior and interior) , interior design, sound system and consumer electronics.
  • iridescent colors on aluminium rolled products is known.
  • iridescent colors it is meant that the color changes as a function of the incident angle.
  • it may be obtained on anodized aluminium having porous anodic oxide films obtained in various electrolytes (sulfuric, phosphoric, oxalic acid etc.) .
  • porous anodic oxide films consist of two layers, a porous thick outer layer 22 and an inner layer which is dense and dielectrically compact called the barrier layer 21.
  • the iridescent phenomenon is due to interference between the light reflected on the oxide surface and the light reflected on a metal/oxide interface.
  • incident angles V as illustrated in Figure 1, different wavelengths of light have either positive or negative interference resulting in different colors being perceived.
  • Iridiscent colors may be observed on porous anodic oxide films.
  • Optical properties and color generation mechanism of porous anodic alumina films are provided of iridescent anodic aluminum oxide films obtained on high purity aluminum foils by phosphoric acid anodizing. The phenomenon appears to be enhanced if the porous anodic oxide film is colored.
  • the patent application WO2017/013607 relates to a structural colouration method for colouring an aluminium substrate, exemplified by alloy 6061, which comprises forming a nano structure of one-dimensional photonic crystals by means of a process of periodic current pulse anodisation, the colour obtained depending on the application time of the maximum and/or minimum current density of the pulse, and the colour varying with the angle of observation.
  • Patent application US2016/0362808 describes a formed aluminum article, exemplified by alloys 6061 and 6063, in which pores formed by anodic oxidation are filled with a pigment, the formed aluminum article having an adequately colored film.
  • the colors can be adjusted by modifying the anodizing and coloring parameters, but for typical anodizing quality, e.g. high purity foils such as those described in the mentioned articles or more generally on 1XXX series alloys, the overall coloring effect remains light.
  • An object of the invention is an anodized decorative rolled product made of an aluminum alloy consisting of, in weight %, Mg : 0 - 1.5,
  • the rolled product has a porous anodic oxide film which is colored electrochemically or chemically and wherein the color of the decorative sheet is different if viewed at an incidence angle 0° and at an incidence angle of 45° .
  • Another object of the invention is a method to make an anodized decorative rolled product according to the invention comprising the steps of
  • porous anodic oxide film by electrochemical deposition preferably of at least one of Zn, Ni, Sn, Co,
  • Cu Ag of or chemical deposition preferably of at least one dye among an azo dye, an anthraquinone dye, an indigo dye,
  • Figure 1 Interference between the light reflected on the oxide surface and the light reflected on a metal/oxide interface, for an anodic porous alumina on an aluminium surface.
  • Metallurgical tempers referred to are designated using the European standard EN-515.
  • EN-515 European standard EN-515.
  • the inventors have found that by using alloys having a specific composition, and in particular including additions of Mg and/or Mn it is possible to obtain decorative aluminium rolled products with strong iridescent colors
  • an anodized decorative rolled product with strong iridescent colors can be obtained with rolled product made of an aluminum alloy consisting of, in weight %,
  • the rolled product has a porous anodic oxide film which is colored electrochemically or chemically and wherein the color of the decorative sheet is different if viewed at an incidence angle 0° and at an incidence angle of 45° .
  • the Si content is at least 0.03 wt . % . Excessive Si content can however be detrimental to formability.
  • the Si content is at most 0.3 wt . % and preferably at most 0.25 wt . % and more preferably at most 0.2 wt . % .
  • the Fe content is at least 0.02 wt . % .
  • Excessive Fe content can however be detrimental to formability.
  • the Fe content is at most 0.5 wt . ⁇ 6 , more preferably at most 0.4 wt . % and preferentially at most 0.2 wt . % .
  • Fe is at most 0.5 wt . % and Si is at most 0.3 wt . % .
  • the other elements which have a content of ⁇ 0.05 wt.% each and ⁇ 0.15 wt.% in total, are undesirable impurities.
  • the alloy contains from 0.8 to 1.5 wt.% Mn and is preferably an alloy from the 3XXX series.
  • Preferred alloys in this first embodiment are AA3103, AA3104 and AA3005.
  • the Mg content is at most 1.3 wt.% and preferably at most 0.6 wt.%
  • the Mn content is at most 0.2 wt.% and the Mg content is from 0.5 to 1.1 wt.%.
  • the alloy is preferably an alloy from the 5XXX series.
  • This second embodiment is advantageously also combined with a Si content of at most 0.2 wt.%, preferably at most 0.1 wt.% and most preferably at most 0.04 wt.%.
  • This second embodiment is advantageously also combined with a Fe content of at most 0.2 wt.%, preferably at most 0.1 wt.% and most preferably at most 0.06 wt .%.
  • Preferred alloys in this second embodiment are AA5005, AA5505 and AA5657.
  • the method to make an anodized decorative rolled product according according to the invention comprises the steps of
  • a matt or bright aspect for example by satin matt etching or by chemical/electrochemical brightening
  • porous anodic oxide film by electrochemical deposition preferably of at least one of Zn, Ni, Sn, Co, Cu, Ag of or chemical deposition preferably of at least one dye among an azo dye, an anthraquinone dye, an indigo dye,
  • porous anodic oxide film by depositing a sol-gel precursor followed by evaporation and/or curing.
  • Typical surfactants are anionic such as carboxylates or sulphonates, nonionic such as ethoxylated aliphatic alcohols, cationic such as quaternary ammonium salts or amphoteric such as aliphatic aminocarboxylic acid salts.
  • the porous outer layer obtained from acid anodizing can be schematically represented as a closed-packed array of hexagonally arranged cells containing pores in each cell-center.
  • Figure 1 illustrates a cross section of a porous anodic oxide film 2 on aluminium an aluminium substrate 1, comprising a barrier layer 21 and a porous outer layer 22.
  • the porous anodic oxide film is characterized by given parameters such as a pore diameter, interpore distance (cell diameter) of the porous outer layer and the barrier layer thickness.
  • the porous anodic oxide film of the products according to the invention exhibit a barrier layer with a thickness advantageously from 15 to 25 nm, in order to obtain the desired iridiscent colors.
  • the porous anodic oxide film total thickness is advantageously between 1 and 10 ym.
  • a sulfuric anodizing can be achieved at l-l,5A/dm 2 at 20°C, providing an approximately 21 nm thick barrier layer, the anodizing time being adjusted to vary the coloring effect,
  • the coloring dyestuff concentration may vary from 0.1 to lOg/L, depending on the color and the required darkness.
  • the temperature is usually in the range of 50 to 60°C, with some exceptions working at lower temperature.
  • the porous anodic oxide film is coated by depositing a sol-gel precursor followed by evaporation and/or curing to obtain a sol-gel coating.
  • a sol-gel precursor followed by evaporation and/or curing to obtain a sol-gel coating.
  • the present inventors observed that surprisingly the sol-gel coating does not alter the iridescent appearance, probably because of its specific optical properties.
  • the sol-gel coating protects the porous anodic film from scratches, fingerprints, and other surface deffects.
  • conventional coatings such as clear lacquer does not allow not to keep the iridescent aspect.
  • the sol-gel precursor is made from a mixture of a polysiloxane, preferably prepared from an alcoholic solution of silane, preferably of an alkoxysilane solution, and an aqueous solution of colloidal silica.
  • the sol-gel precursor is advantageously prepared from two solutions A and B, solution A being an alcoholic solution of one or more alkoxysilanes , the alcohol used as solvent being methanol, ethanol, propanol, preferably isopropanol, butanol or a combination thereof, the alkoxysilanes being described by the general formula XnSi (OR) 4- n wherein "R” is a simple alkyl, preferably chosen in the group consisting of methyl, ethyl, propyl and butyl and "X" is also an alkyl, preferably selected from the group consisting of methyl, ethyl, propyl and butyl; solution B being a solution of colloidal silica dissolved in water.
  • solution A contains 25 - 35 wt% TEOS and 15 - 25 wt% MTMOS, both dissolved in 40 - 60 wt% isopropyl alcohol.
  • Advantageously solution B is set with an acid, preferably with nitric acid (HN03) , to a pH value between 2.0 and 4, preferably between 2.5 and 3.0 and more preferably close to 2.7.
  • Advantgeously the alkali content of the silica is less than 0.04 wt % Na 2 0.
  • the deposition of the sol-gel precursor is carried out by immersion.
  • the sol-gel coating thickness is comprised between 2 and 4 ym.
  • the sol-gel coating contains a small quantity of organic compounds, for example the carbon content of the coating as measured by XPS (X-Ray Photoelectron Spectrometry) is less than 10 atomic % as measured by concentration profile through the sol-gel coating.
  • curing of the sol-gel is done at a temperature comprised between 150 and 250 °C during 30 to 60 seconds.
  • the product of the invention is particularly useful for decorative applications such as cosmetic packaging, automotive trims (exterior and interior) , interior design, sound system and consumer electronics.
  • composition of the alloys is provided in Table 1
  • Electrolytic coloring with nickel sulphate 30g/L, boric acid 30g/L, ammonium sulphate 15g/L, 35°C, 2 min 19V AC current or chemical coloring with an azo dye chromium complex : Sanodal® Black 2LW (lg/L), with an azo dye copper complex : Sanodure® Fast Gold L (3g/L) , and with an anthraquinone dye :Sanodye® Blue 2LW (3g/L) at 60°C during 2 min,
  • the resulting samples were observed at different incident angles.
  • the intensity of colors was classified through comparison with reference samples and scaled from 1 : light to 3 : strong.
  • Coloring with alloys according to the invention enables obtention of strong iridescent colors, ranging from 2 to 3.
  • the sample of example 1 made of alloy 5657 is protected by a sol-gel coating.
  • the sol-gel solution applied by immersion consists of the mixture of a solution A and a solution B.
  • Anhydrous solution A comprises a mixture of unhydrolyzed siloxanes and alcohols:
  • TEOS tetraethylorthosilicate
  • trimethoxymethylsilane (MTMOS)
  • the aqueous solution B comprises: 25% by weight of colloidal silica and 75% by weight of water.
  • the pH of solution B is modified to reach 2.5 by addition of acid such as, for example, HN03.
  • the silica must have the lowest possible alkaline content, preferably less than 0.04 m.cL S S "6 of Na20.
  • Solution A is mixed with solution B in the presence of nitric acid with continuous stirring and leads to a hydrolysis and condensation reaction bringing the mixture to a gel state.
  • Solutions A and B are mixed with a weight ratio of preferably 7 : 3.
  • the mixture is preferably maintained at a pH value of between 2 and 4, preferably 2.5 to 3.0, and most preferably 2.7.
  • the pH value is corrected by addition of acid, preferably nitric acid.
  • the resulting solution is filtered.
  • the filtration may, for example, be carried out using polypropylene filters with a mesh size of 1 micron. Before use, the solution is left standing for 12 to 22 hours before being applied to the substrate to form the protective deposit.
  • the baking of the deposit is carried out at a temperature of 150 to 250 ° C for 30s to 60s.
  • the thickness of the deposit is preferably 2 to 4 ⁇ and contains only very few organic compounds (less than 10 at%, measured by depth profile in XPS) .
  • the strong iridescent coloring of the alloy according to the invention is not modified by the sol-gel coating, which is suprising because irridescence is based on interference phenomena and the addition of a thin coating is expected to affect coloring. Moreover the surface is well protected mechanically by the sol-gel coating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention concerne un produit laminé décoratif anodisé fait d'un alliage d'aluminium constitué, en % en poids, de : Mg : 0 à 1,5 ; Mn : 0 à 1,5, où Mg + Mn = 0,5 à 3 et où -soit Mn : 0,8 à 1,5 soit Mg : 0,5 à 1,1 et Mn ≤ 0,2 ; Si : ≤ 0,6 ; Fe : ≤ 0,8 ; Ti : ≤ 0,1 ; Cu : ≤ 0,3 ; Cr : ≤ 0,1 ; Zn : ≤ 0,25 ; Zr : ≤ 0, ; d'autres éléments ≤ 0,05 chacun et ≤ 0,15 au total, le reste étant de l'aluminium. Le produit laminé a un film d'oxyde anodique poreux qui est coloré par voie électrochimique ou chimique et la couleur de la tôle décorative est différente si elle est vue à un angle d'incidence de 0° et à un angle d'incidence de 45°. Le produit selon l'invention est particulièrement utile pour des applications décoratives telles que l'emballage de produits cosmétiques, les garnitures d'automobiles (extérieures et intérieures), la décoration intérieure, les systèmes sonores et l'électronique grand public.
EP18735324.8A 2017-07-10 2018-07-05 Produit laminé en alliage d'aluminium à couleurs iridescentes intenses Active EP3652363B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1756527A FR3068712B1 (fr) 2017-07-10 2017-07-10 Produit lamine en alliage d’aluminium ayant des couleurs iridescentes intenses
PCT/EP2018/068242 WO2019011778A1 (fr) 2017-07-10 2018-07-05 Produit laminé en alliage d'aluminium à couleurs iridescentes intenses

Publications (2)

Publication Number Publication Date
EP3652363A1 true EP3652363A1 (fr) 2020-05-20
EP3652363B1 EP3652363B1 (fr) 2021-06-23

Family

ID=59974599

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18735324.8A Active EP3652363B1 (fr) 2017-07-10 2018-07-05 Produit laminé en alliage d'aluminium à couleurs iridescentes intenses

Country Status (4)

Country Link
EP (1) EP3652363B1 (fr)
ES (1) ES2882886T3 (fr)
FR (1) FR3068712B1 (fr)
WO (1) WO2019011778A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3553208A1 (fr) * 2018-04-09 2019-10-16 DURA Operating, LLC Procédé de fabrication d'un composant en aluminium ayant une surface colorée
CN112973677A (zh) * 2019-12-13 2021-06-18 山西潞安矿业(集团)有限责任公司 一种疏水性贵金属催化剂的制备方法和应用
CN111206275B (zh) * 2020-02-17 2021-04-06 王勇 一种用于铝合金阳极氧化膜的耐强酸及强碱性封孔处理方法
CN112501461B (zh) * 2020-10-23 2022-05-31 福耀汽车铝件(福建)有限公司 一种车用高光铝合金外饰件板材的制备方法

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Publication number Priority date Publication date Assignee Title
DE102008011298A1 (de) * 2007-03-16 2008-09-18 Süddeutsche Aluminium Manufaktur GmbH Teilpigmentierung einer Deckschicht zur Vermeidung von Interferenzen bei Aluminiumbauteilen oder Aluminium aufweisenden Bauteilen
EP2904132A1 (fr) * 2012-10-08 2015-08-12 Süddeutsche Aluminium Manufaktur GmbH Procédé de production d'un revêtement sol-gel sur une surface à revêtir d'un composant et composant correspondant
CN106068338A (zh) * 2014-02-28 2016-11-02 株式会社樱花彩色笔 着色铝成形体及其制造方法
AR102806A1 (es) * 2015-07-21 2017-03-29 Consejo Nac De Investig Científicas Y Técnicas (Conicet) Método de coloración estructural de aluminio anodizado por formación de cristales fotónicos mediante pulsos de corriente

Also Published As

Publication number Publication date
FR3068712A1 (fr) 2019-01-11
WO2019011778A1 (fr) 2019-01-17
EP3652363B1 (fr) 2021-06-23
ES2882886T3 (es) 2021-12-03
FR3068712B1 (fr) 2021-10-01

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