EP1943375A2 - Verfahren zur verbesserung der korrosionsbeständigkeit und lichtechtheit von gefärbten aluminiumoxidschichten - Google Patents

Verfahren zur verbesserung der korrosionsbeständigkeit und lichtechtheit von gefärbten aluminiumoxidschichten

Info

Publication number
EP1943375A2
EP1943375A2 EP06792425A EP06792425A EP1943375A2 EP 1943375 A2 EP1943375 A2 EP 1943375A2 EP 06792425 A EP06792425 A EP 06792425A EP 06792425 A EP06792425 A EP 06792425A EP 1943375 A2 EP1943375 A2 EP 1943375A2
Authority
EP
European Patent Office
Prior art keywords
aluminum
polysilazane
light fastness
oxide layer
oxide layers
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.)
Withdrawn
Application number
EP06792425A
Other languages
German (de)
English (en)
French (fr)
Inventor
Stefan Brand
Andreas Dierdorf
Hubert Liebe
Frank Osterod
Oliver Eich
Mark Jozefowicz
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.)
AZ Electronic Materials Luxembourg SARL
Original Assignee
Clariant International Ltd
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 Clariant International Ltd filed Critical Clariant International Ltd
Publication of EP1943375A2 publication Critical patent/EP1943375A2/de
Withdrawn legal-status Critical Current

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
    • C25D11/24—Chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
    • C09D183/16—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers in which all the silicon atoms are connected by linkages other than oxygen atoms

Definitions

  • Structures, objects or parts of aluminum or aluminum alloys provided with a protective oxide layer, in particular an oxide layer galvanically produced by anodization, are nowadays increasingly used in engineering and construction, e.g. as a component or / and for the decoration of buildings, means of transport or means of transport, or for utility or art objects.
  • a protective oxide layer in particular an oxide layer galvanically produced by anodization
  • For the aesthetic design of such structures, objects or parts of these, or their oxide layers are like colored. It is therefore desirable that the colored layers have high resistance to corrosion and light and retain their colored design as long as possible.
  • the protective oxide layer is often produced by anodization.
  • various anodization conditions are known.
  • all methods have in common that a minimum layer thickness of aluminum oxide is required to ensure a corresponding corrosion protection.
  • a lesser quality with regard to the corrosion protection also has the disadvantage that the Aiuminiumober Assembly is unusable for decorative purposes, since a visual impairment is always the result of such an undesirable process.
  • Such processes occur in addition to natural corrosion, especially when chemically aggressive substances reach the surface. This applies equally to colored and uncoloured surfaces.
  • the oxide layers colored therewith can be compacted in a conventional manner, for example with hot water.
  • the available colors can be very different light and Have corrosive fastness, especially after prolonged exposure to sunlight or exposure to aggressive substances, so that often an undesirable impairment or even deterioration of the surface quality and in particular the color impression can occur.
  • bright color shades of many dyes are not sufficiently light stable.
  • Corrosion resistance with improved light fastness of the colored layers can be obtained when the colored aluminum oxide layers are coated with a polysilazane-based inorganic paint. In this way, it is possible to reduce the aluminum oxide layer thickness or the amount of dye in this layer without impairing the quality of the layers.
  • the present invention thus relates to a process for producing corrosion-resistant, colored oxide layers on aluminum or aluminum alloys, wherein a polysilazane solution is applied to a dry oxide layer colored with a water-soluble, anionic dye and the coating is subsequently heated at a temperature in the range from 40 to 150 0 C is cured.
  • a polysilazane solution is applied to a dry oxide layer colored with a water-soluble, anionic dye and the coating is subsequently heated at a temperature in the range from 40 to 150 0 C is cured.
  • the colored oxide layers on aluminum or aluminum alloys are produced by immersing the anodically produced, porous aluminum oxide layer in an aqueous solution of dyes and then compacting the colored layers.
  • dyes those which are known or usable for coloring anodized alumina layers can be generally used. Furthermore, and in particular are now also such
  • the anionic dyes or metal salts may be in the form of the free acids or preferably in the form of water-soluble or water-insoluble salts, for example as alkali metal, alkaline earth metal and / or ammonium salts. It is the method of adsorptive staining. This method can be carried out by various types of surface treatment (spraying, brushing or dipping) with the solutions of these dyes. It is also possible to prepare printing pastes with these dyes, which are then applied by the screen printing method or ink jet method.
  • the aluminum oxide layers produced by anodic oxidation can also be produced by metal salts according to the principle of the electrolytic dyeing process.
  • the anodized aluminum surface is colored after the anodization in a metal salt bath by attaching an AC electrical voltage.
  • An example is the Sandocolor or Colinal process.
  • This application also applies to dyeings on anodized aluminum surfaces which have been colored according to the principle of color anodization or hard anodization. This is a process in which coloring substances are present in anodizing tanks and these substances are incorporated into the aluminum oxide layer during anodic oxidation.
  • An example is the Permalux method or the Huwyler method.
  • the oxide layers to be colored are usually artificially generated
  • aluminum alloys are primarily those in which the aluminum content predominates, especially alloys with magnesium, silicon, zinc and / or copper, e.g. Al / Mg, Al / Si, Al / Mg / Si, Al / Zn / Mg, Al / Cu / Mg and Al / Zn / Mg / Cu, preferably those in which the aluminum content is at least 90% by weight; the magnesium content is preferably
  • the silicon content is preferably
  • the zinc content is preferably ⁇ 10% by weight; the copper content is advantageously ⁇ 2 percent by weight, preferably
  • the oxide layers formed on the metallic aluminum or on the aluminum alloys may have been produced by chemical oxidation or, preferably, galvanically by anodic oxidation.
  • the advantage of the method described here lies in the possibility of using thin oxide layers. The processes described so far show in these thin oxide layers only a lack of stability against corrosive attack and low light fastness of the colored surfaces, especially in light shades.
  • the anodic oxidation of the aluminum or aluminum alloy for passivation and formation of a porous layer can be carried out by known methods, using direct current and / or alternating current, and using appropriate electrolyte baths, for example with the addition of sulfuric acid, oxalic acid, chromic acid, citric acid or combinations of oxalic acid and chromic acid or sulfuric acid and oxalic acid.
  • Such anodization processes are known in the art, eg the GS process (direct current, sulfuric acid), the GSX process (direct current, sulfuric acid with the addition of oxalic acid), the GX process (direct current, oxalic acid), the GX process with the addition of Chromic acid, the WX process (alternating current, oxalic acid), the WX-GX process (oxalic acid, first alternating current then direct current), the WS process (alternating current, sulfuric acid) and the chromic acid process (direct current, chromic acid).
  • the current voltages are, for example, in the range of 5 to 80 volts, preferably 8 to 50 volts; the temperatures are, for example, in the range of 0 to 50 C C; the current density at the anode is eg in the range from 0.3 to 5 A / dm 2 , D
  • the voltage in the range of 12 to 25 volts; the current density is preferably 1 to 2 A / dm 2 .
  • the layer thickness of the porous oxide layer is advantageously in the range of 5 to 25 microns, preferably 8 to 15 microns. If the anodized aluminum or anodized aluminum alloy has been stored for a short time (e.g., 1 week or less) before dyeing, it is advantageous to wet and / or activate the substrate prior to dyeing, e.g. by treatment with a non-reducing, aqueous mineral acid, e.g. with sulfuric acid, hydrogen peroxide or nitric acid.
  • a non-reducing, aqueous mineral acid e.g. with sulfuric acid, hydrogen peroxide or nitric acid.
  • the dyeing is advantageously carried out at temperatures of 15-98 ° C, and advantageously more preferably at temperatures between 18 to 70 0 C 20 to 60 0 C.
  • the pH of the dyeing liquor lies, for example, in the weakly acidic to weakly basic range, for example in the pH range from 3 to 8, with weakly acidic to almost neutral conditions being preferred, in particular in the pH range from 3 to 7.
  • the dye concentration and the dyeing time can vary greatly depending on the substrate and the desired dyeing effect. For example, dye concentrations in the range from 0.01 to 50 g / l are advantageous 0.05 to 30 g / l, in particular 0.1 to 10 g / l.
  • the dyeing time can be, for example, in the range of 10 seconds to 1.5 hours, advantageously 1 to 90 minutes, preferably 5 to 60 minutes.
  • the dyeings thus obtained can now be compacted or subjected directly to the coating procedure. Before densification, the dyeings are advantageously rinsed with water.
  • the compaction can be carried out by means of all literature-known procedures and compaction means.
  • Advantageous are: vapor compression, hot water compression with and without deposit inhibitor, mid-temperature sealing with additives (deposit inhibitor) and / or metal salts, nickel hot compression or cold compression with and without subsequent hot water treatment.
  • vapor compression the aluminum parts are introduced into a container filled with water vapor, the pressure conditions being defined.
  • a pretreatment by means of metal salts can also be carried out.
  • a pre-sealing can be started at 70 0 C in a nickel acetate, and an anionic surfactant-containing aqueous solution (nickel-hot sealing, seal salt ASL).
  • nickel-hot sealing, seal salt ASL nickel-hot sealing, seal salt ASL
  • Another possibility for this pre-sealing is the use of cold-sealing.
  • This pre-sealing is then completed by a hot dip in hot water with or without the addition of a hot water sealant (Anodal SH-1) or a mid-temperature sealing aid (Anodal SH-2) (two-stage densification ).
  • the compacted anodized aluminum is dried.
  • Simple wiping techniques or hot air blowers up to a temperature range of 11O 0 C can be used here.
  • Other dry processes are also possible here. Drying in air is also carried out.
  • the coating is carried out with a polysilazane solution.
  • This coating can also be applied to the un-aged aluminum surface after anodization after the coloring process.
  • Erflndungsloom be used for coating polysilazane solutions containing a solvent, a catalyst and a polysilazane or a mixture of polysilazanes of general formula 1
  • R ', R “, R'” are the same or different and are independently hydrogen or an optionally substituted alkyl, aryl or (Trialkoxysilyl) alkyl radical, wherein it is an integer n and n is such that the polysilazane has a number average molecular weight of 150 to 150,000 g / mol.
  • R ', R ", R'” independently represent a radical from the group hydrogen, methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, tert-butyl, phenyl, vinyl or 3- (triethoxysilyl) propyl, 3- (trimethoxysilylpropyl).
  • perhydropolysilazanes of the formula 2 are used for the coating according to the invention.
  • Polysilazanes or polysilazane solutions which can be used according to the invention are used e.g. in PCT / EP 2005/011 425, which is incorporated herein by reference.
  • Further constituents of the polysilazane solution may be additives which influence, for example, viscosity of the formulation, substrate wetting, film formation or the bleeding behavior, and optionally inorganic nanoparticles such as, for example, SiO 2 , TiO 2 , ZnO, ZrO 2 , indium tin oxide (ITO) or Al 2 O 3 , UV stabilizers such as HALS. Connections are used.
  • the hardening of the polysilazane coating is preferably carried out at an oven temperature of 40 to 15O 0 C, preferably 50 to 120 0 C, particularly preferably 60 to 110 0 C.
  • the drying time is usually 10 minutes to 12 hours, depending on the layer thickness.
  • drying lamps based on UV, IR or NIR technology are also possible.
  • the thus applied, cured Polysilazanbetikungen have a layer thickness of 1 to 10 .mu.m, in particular from 2 to 5 microns.
  • ISO regulations e.g. according to ISO Regulation No. 2135-1984, by dry-exposing a sample in exposure cycles of 100 hours of standard light exposure in an Atlas Weather-O-meter 65 WRC equipped with a xenon arc lamp or in accord
  • the corrosion resistance can be determined according to the test standard ISO 3770 by means of the CASS test (Copper Accelerated Salt Spray Test).
  • the parts are then cleaned and subjected to an ISO 1462 evaluation. It is here in the polysilazane-coated samples, a significant decrease in
  • the parts are parts by weight and the percentages by weight; the temperatures are given in degrees centigrade; the dyes are used in commercial form.
  • Example 1 (Reference A): A defatted and deoxidized sheet of pure aluminum is dissolved in an aqueous solution containing, in 100 parts, 16.5-22 parts of sulfuric acid and 0.5-1.5 parts of aluminum at a temperature of 17 to 21 0 C, at a voltage of 12 to 20 volts with direct current, a density of 1, 0-1, 8 A / dm 2 , anodized for 40 to 50 minutes. In this case, an oxide layer of about 20 to 24 microns thick is formed. After rinsing with water, the anodized aluminum sheet is dyed for 30 minutes at 60 ° C. and a pH of 5.6 with aluminum orange G (Clariant, concentration: 3 g / l).
  • the dyed sheet is then rinsed with water and compacted with Anodal SH-1 (Clariant, concentration: 2 ml / l) at 98 ° for 50 min.
  • the colored sheet is rinsed with water and with Anodal SH-1 (Clariant, concentration: 2 ml / l) at 100 0 C for 60 and 30 min. compacted.
  • Anodal SH-1 Celariant, concentration: 2 ml / l
  • Example 2 It is prepared analogously to Example 1, a further sample, which is provided after densification and drying with a polysilazane. For this, the dyed, anodized aluminum sheet is now immersed in a solution of NL 120 A-20® (Clariant) for a few seconds and carefully pulled out. After a brief dripping, the sample is dried at 12O 0 C for 3 h.
  • Example 2 It is prepared analogously to Example 1, a further sample, which is provided after densification and drying with a polysilazane.
  • a mixture of a nanoparticulate ZnO dispersion (20 mol%) in dibutyl ether and a polysilazane solution NL 120 A-20® (20 mol%) in dibutyl ether in a ratio of 1: 1 is prepared.
  • the dried, colored, anodized aluminum sheet is then immersed in the above mixture for a few seconds and carefully pulled out. After a brief dripping, the sample is dried at 11O 0 C for 3 hours.
  • Example 2 It is prepared analogously to Example 2, a further sample, which is provided after densification and drying with a polysilazane.
  • the dyed, anodized aluminum sheet is now immersed for a few seconds in a solution of NL 120 A-20 (Clariant) and carefully pulled out. After a brief drain, the sample is dried at 12O 0 C for 2 h.
  • Example 6 A further sample is prepared analogously to Example 2, which is provided with a polysilazane layer after compaction and drying. For this purpose, a mixture of a nanoparticulate ZnO dispersion (20 mol%) in dibutyl ether and a polysilazane solution NL 120 A-20® (20 mol%) in dibutyl ether in a ratio of 1: 1 produced. The dried, colored, anodized aluminum sheet is then immersed in the above mixture for a few seconds and carefully pulled out. After a brief drain, the sample is dried at 110 0 C for 3 hours.
  • Example 7 A further sample is prepared analogously to Example 2, which is provided with a polysilazane layer after compaction and drying. For this, the dyed, anodized aluminum sheet is now immersed in a solution of NP 110-10® (Clariant) for a few seconds and carefully pulled out. After a brief drain, the sample is dried at 100 0 C for 3 h.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Metallurgy (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Chemical Treatment Of Metals (AREA)
EP06792425A 2005-10-27 2006-10-13 Verfahren zur verbesserung der korrosionsbeständigkeit und lichtechtheit von gefärbten aluminiumoxidschichten Withdrawn EP1943375A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005051755A DE102005051755A1 (de) 2005-10-27 2005-10-27 Verfahren zur Verbesserung der Korrosionsbeständigkeit und Lichtechtheit von gefärbten Aluminiumoxidschichten
PCT/EP2006/009907 WO2007048513A2 (de) 2005-10-27 2006-10-13 Verfahren zur verbesserung der korrosionsbeständigkeit und lichtechtheit von gefärbten aluminiumoxidschichten

Publications (1)

Publication Number Publication Date
EP1943375A2 true EP1943375A2 (de) 2008-07-16

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Family Applications (1)

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EP06792425A Withdrawn EP1943375A2 (de) 2005-10-27 2006-10-13 Verfahren zur verbesserung der korrosionsbeständigkeit und lichtechtheit von gefärbten aluminiumoxidschichten

Country Status (9)

Country Link
US (1) US8057858B2 (enExample)
EP (1) EP1943375A2 (enExample)
JP (1) JP2009513824A (enExample)
KR (1) KR20080059468A (enExample)
AR (1) AR057561A1 (enExample)
CA (1) CA2627399A1 (enExample)
DE (1) DE102005051755A1 (enExample)
TW (1) TW200728508A (enExample)
WO (1) WO2007048513A2 (enExample)

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US7732068B2 (en) * 2007-08-28 2010-06-08 Alcoa Inc. Corrosion resistant aluminum alloy substrates and methods of producing the same
US8309237B2 (en) 2007-08-28 2012-11-13 Alcoa Inc. Corrosion resistant aluminum alloy substrates and methods of producing the same
US20090162544A1 (en) * 2007-12-20 2009-06-25 Garesche Carl E Method of surface coating to enhance durability of aesthetics and substrate component fatigue
DE102008023079A1 (de) * 2008-05-09 2010-01-07 WKW Erbslöh Automotive GmbH Verfahren zum Verdichten eines Bauteils aus Aluminium und/oder einer Aluminiumlegierung
JP5633429B2 (ja) 2011-02-25 2014-12-03 スズキ株式会社 被処理物の塗装方法
US20140262790A1 (en) * 2013-03-12 2014-09-18 Thomas Levendusky Colored, corrosion-resistant aluminum alloy substrates and methods for producing same
US9725819B2 (en) 2013-09-30 2017-08-08 Apple Inc. Methods for incorporating ultraviolet light absorbing compounds into anodic oxides
JP6046665B2 (ja) * 2014-06-10 2016-12-21 トヨタ自動車株式会社 断熱膜の形成方法および断熱膜

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EP0936288A3 (en) * 1998-01-07 2000-06-07 Clariant Finance (BVI) Limited A process for producing colour variations on electrolytically pigmented anodized aluminium
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Also Published As

Publication number Publication date
AR057561A1 (es) 2007-12-05
CA2627399A1 (en) 2007-05-03
US8057858B2 (en) 2011-11-15
US20090220806A1 (en) 2009-09-03
WO2007048513A3 (de) 2007-10-25
DE102005051755A1 (de) 2007-05-10
WO2007048513A2 (de) 2007-05-03
KR20080059468A (ko) 2008-06-27
TW200728508A (en) 2007-08-01
JP2009513824A (ja) 2009-04-02

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