EP2586894B1 - Procédé de finition anodisée d'un profilé métallique à base d'aluminium, avec motif et profilé ainsi obtenu. - Google Patents

Procédé de finition anodisée d'un profilé métallique à base d'aluminium, avec motif et profilé ainsi obtenu. Download PDF

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Publication number
EP2586894B1
EP2586894B1 EP12352004.1A EP12352004A EP2586894B1 EP 2586894 B1 EP2586894 B1 EP 2586894B1 EP 12352004 A EP12352004 A EP 12352004A EP 2586894 B1 EP2586894 B1 EP 2586894B1
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EP
European Patent Office
Prior art keywords
profile
pattern
metal profile
bath
coating layer
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Active
Application number
EP12352004.1A
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German (de)
English (en)
French (fr)
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EP2586894A1 (fr
Inventor
Patrick Lahbib
Bernard Montfort
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.)
Norsk Hydro ASA
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Norsk Hydro ASA
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Publication of EP2586894A1 publication Critical patent/EP2586894A1/fr
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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
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C25D11/04—Anodisation of aluminium or alloys based thereon
    • C25D11/16—Pretreatment, e.g. desmutting

Definitions

  • the present invention relates more particularly to the field of construction, more particularly the building.
  • Anodizing processes are well known in particular in the field of building profiles, with light alloy profiles based on aluminum.
  • the preparation generally consists of a degreasing of the surface of the profile, and / or a treatment in particular according to the surface condition that is desired at the end of the anodizing process.
  • the treatments are in principle of two types: mechanical and / or chemical.
  • mechanical treatment including pickling, shot blasting, sanding, polishing, etc; and as chemical treatment, etching or chemical satin, well known in the field of building.
  • chemical satin is to remove the natural oxides covering the surface of the profile, by immersing the profile in a bath containing the satin solution generally based on sodium hydroxide and complexing agents.
  • the immersion step in one or more anodizing baths is well known to those skilled in the art and will not be described in more detail here. This step may differ depending on whether the desired anodic oxidation layer is colored or natural by the anodizing baths used, in particular baths containing electrolytically colored metal salts.
  • This well-known method of finishing by anodizing is not very flexible in use and allows to achieve exclusively a uniform finish of the surface of the profile by the principle of the bath: for example matte finish, satin, shiny, natural or colored.
  • an additional step of stabilizing the anodic oxidation layer is carried out by a known sealing operation, which consists for example in immersing the anodized section in a bath of hot water, especially boiling.
  • Such anodizing finishing process which offers excellent resistance to corrosion and abrasion, does not make it possible to carry out a marking or a pattern on the surface of the profile because of the nature of this electrolytic bath process which affects any the surface of the profile in contact with the bath.
  • the Applicant has devised and carried out a test consisting in marking an anodized finished profile by means of a method of marking by powder sintering by means of a laser known elsewhere for marking the ceramic. There was a spurt of sparks on the impact of the laser: the powder was projected and the pattern was not formed.
  • the method according to the invention makes it possible to produce any pattern on the surface of an aluminum-based metal profile, for example a decorative pattern that aims to give the visible part of the profile a particular aesthetic while benefiting from effective protection by anodizing the profile.
  • the color of the pattern is defined by the color of the sintered powder and the shape may for example be defined by a program of appropriate displacement of the laser beam according to the desired pattern.
  • Anodizing cooperates with laser sintering to provide homogeneous protection of the entire surface of the profile. Indeed, the sintering method provides both the realization of a pattern and the protection of the corresponding surface of the profile above which the pattern extends.
  • the anodizing process cooperates with the sintered surface portions with the powder to complete the protection of the entire surface of the profile, taking over the protective relay from the contours of the pattern and outside thereof.
  • Anodizing has no effect on the surfaces covered by the sintered powder, which, in turn, is not degraded by the anodizing bath.
  • the sintered powder-based coating is particularly resistant to corrosion and abrasion, like anodizing.
  • the step of depositing a coating layer comprising at least one powdery substance on the surface of the metal section on which a pattern is to be made consists in depositing said powdered substance mixed with water.
  • This feature has ergonomic advantages for placing the powder while attaching it to the surface of the profile before sintering is performed.
  • the process according to the invention further comprises a step of drying said coating layer after having deposited it on the surface of the metal section on which a pattern is to be made.
  • This step makes it possible to store the profile provided with its coating layer for a certain period of time and before carrying out the sintering then anodizing step, as required.
  • the drying is for example carried out by hot air.
  • said powder substance comprises at least one mineral powder, and according to another advantageous characteristic, said mineral powder is a ceramic powder.
  • This type of powder proves to combine the best qualities of adhesion to the aluminum-based metal profile, and resistance to corrosion, mainly due to weather, and friction.
  • the step of immersing the profile in at least one anodizing bath, in order to form on its surface an anodic oxidation layer is preceded by a step of chemical saturation of the profile which is posterior to the sintering step.
  • the chemical satin stage which falls into the category of preparatory steps for anodizing process, offers a particularly interesting anodising surface finish.
  • the applicant has found that the chemical satin which has been positioned after the sintering operation, does not degrade the latter since the bathing time is preferably limited, for example for a period of between 2 and 10 minutes, of preferably of the order of 5 minutes.
  • the marking of the pattern is part of the preparatory operations phase for anodizing baths.
  • the step of preparing the surface of the aluminum-based metal profile for at least one anodizing bath comprises a mechanical treatment step which precedes the step of depositing a coating layer comprising at least one minus a powdery substance on the surface of the aluminum-based metal profile on which a pattern is to be made.
  • mechanical treatment is meant a preparatory treatment of the surface of the profile on the principle of a mechanical attack of the surface, by example by blasting, sanding, polishing, etc.
  • a mechanical preparatory treatment, by shot blasting or sanding, is particularly suitable in the context of the process according to the invention, in combination with a low-saturation saturation, the production of the pattern by sintering being interposed between these two steps preparatory to anodization.
  • the method according to the invention further comprises a step consisting in stabilizing, by clogging, the anodic oxidation layer formed by immersing the metal profile in at least one anodizing bath, and according to another advantageous step, the The step of clogging stabilizing the anodic oxidation layer formed by immersing the metal profile in at least one anodizing bath comprises immersing said profile in a high temperature water bath.
  • Clogging is a known step in conventional anodizing processes.
  • This step which generally consists of stabilizing the anodic oxidation layer, is preferably carried out, in the context of the process according to the invention, in a very hot, preferably boiling water bath.
  • the step of scanning said coating layer by means of a laser beam consists in scanning transversely the metal section with said laser beam, and in longitudinally scanning the metal section by a longitudinal displacement of the latter.
  • This characteristic offers a good compromise of speed and reduced cost for the realization of the pattern, which uses the elongated shape of the profile and simplifies the means for moving the laser beam.
  • said laser beam is perpendicular or substantially perpendicular to the surface of the metal section comprising the pattern to be produced.
  • the invention furthermore relates to a metal profile obtained according to a method according to the invention, and more particularly to an aluminum-based metal profile characterized in that it comprises, on an outer surface thereof, a pattern comprising a sintered powder which extends over a first portion of said outer surface having a surface area less than that of said outer surface, the second portion of said outer surface of the aluminum-based metal profile which is complementary to said first portion to form the entire surface of said outer surface, having a coating formed of an anodic oxide layer .
  • the profile according to the invention offers a plurality of possible finishes through the representation of a pattern determined as required, for example an aesthetic pattern, combined with the anodic oxide layer protection for surfaces having no pattern made by means of a sintered powder.
  • the realization of the pattern 11 is intercalated between operations of the preparatory phase to the anodization phase.
  • This preparatory phase advantageously comprises a mechanical treatment step which directly precedes the step of depositing a coating layer comprising at least one powdery substance, on the surface of the aluminum-based metal profile, on which a pattern 11 is to be made.
  • Shot peening is an example of a particularly suitable mechanical pickling treatment according to the invention, and consists of a high-speed projection of steel microbeads on the surface of the profile.
  • the mechanical etching treatment is important in the example described because of a chemical etching treatment of reduced duration as will be explained later.
  • the powder substance comprises at least one mineral powder, preferably a ceramic powder, for example a glass powder mixed with pigments.
  • the powder thus obtained is mixed with water until a mixture sufficiently fluid to be sprayed with a gun.
  • the powder mixed with water can be distributed to the surface area of the profile with a relatively thin layer 16 of the order of 4 mg per cm2 on average and for example.
  • the amount of powder / water spray mixture per unit area of the profile 10 should be sufficient to cover the entire surface, appreciated for example in view.
  • other types of powder for example metal powders, can be used according to the process according to the invention with results however less satisfactory than with mineral powders.
  • the drying is carried out for example by means of a flow of air, preferably hot, in order to reduce the drying time.
  • the drying time can be of the order of a few seconds, ten for example, in the case of a hot air flow.
  • the coating 16 should not be handled with fingers, for example, and more generally should not be soiled for better subsequent laser scanning and better quality, homogeneity, and durability of the pattern 11 obtained.
  • the step of sweeping said coating layer 16 by means of a laser beam is preferably transversely scanning the metal section 10 with the laser beam, and longitudinally scanning the metal section 10 by a longitudinal displacement of this last.
  • the laser beam is preferably perpendicular or substantially perpendicular to the surface of the metal section 10 comprising the pattern 11 to achieve.
  • the sintering step consists of baking the powder with the aid of a laser beam, on a surface corresponding to the pattern 11 to be produced.
  • a laser suitable for the process according to the invention is for example a laser "Ytterbium 50 Watts".
  • the heating temperature of the coating is of the order of 1000 ° C.
  • a thin layer 14 of mixed aluminum and ceramic zone is formed in the profile 10 at the junction of the coating layer 16 and the profile 10.
  • the pattern 11 that it is desired to achieve is prepared in computer form in the form of a data file defining the pattern to be produced.
  • the first option is preferred.
  • the laser beam thus fires the ceramic powder used in the example, at the location of the pattern 11 throughout the profile.
  • the precision obtained is of the order of 100 ⁇ m (micrometers) for example, with a laser dot diameter focused at the pattern 11 of the same value or substantially the same value.
  • Subsequent cleaning after sintering consists of removing the coating 16 of ceramic powder which has not been cooked by the sintering operation 5, that is to say at the places which are not part of the desired pattern 11.
  • the satin 7 which follows the sintering 5 and precedes the anodization 8, in the example described, can be advantageously carried out in a conventional satin bath used in the context of a conventional anodizing procedure.
  • a satin bath is for example made of soda and conventional complexing agents.
  • the difference with a conventional satin lies in the immersion time which is, in the context of the invention, reduced to a few minutes, for example of a duration of between 2 and 10 minutes, preferably 5 minutes, instead of the 25 minutes generally applied in the context of a conventional satin.
  • the satin 7 causes a removal of the surface layer of the aluminum profile 10 on its surface in contact with the bath.
  • the profile 10 is not etched under the surface of the pattern 11 which constitutes an insulation layer vis-à-vis the satin bath.
  • the thickness of material removed by the satin is advantageously determined so that the free surface of the pattern 11 preferably remains in relief relative to the free surface of the subsequent anodic oxidation layer.
  • the removed profile thickness is such that it exposes the wafer of the mixed layer 14, as shown.
  • Anodization 8 is conventionally carried out in anodizing baths, in particular according to the desired color and thickness of the anodizing layer, as shown in FIG. figure 6 , and will not be described in more detail here.
  • the sintered powder-based pattern 11 is resistant to the anodizing baths and prevents the anodizing reaction on the surface of the profile 10 which is located below the pattern 11, avoiding contact with the bath liquid at this surface. .
  • the clogging 9 of the anodic oxidation layer 15 in order to promote a good resistance to corrosion of this layer is advantageously in a conventional manner, for example either by steaming or by immersing the anodized profile and having the pattern in a bath water at high temperature, for example boiling or boiling, which has the effect of accelerating the kinetics of reaction.
  • a clogging with nickel salts can be practiced, which in addition to the hydration of the anodizing layer, a nickel hydroxide precipitation occurs inside the pores which makes it possible to improve the closure thereof.
  • the powder coating layer may adopt a thickness of between 10 and 15 ⁇ m (micrometers) after sintering, the mixed aluminum and ceramic layer 14 having been observed according to the described example of a thickness of the order of 5 microns (micrometers).
  • the layer removed from the profile 10, in the satin bath 7, has for example a thickness of the order of 10 microns (micrometers).
  • the anodic oxidation layer which penetrates slightly to the surface of the profile left free by the anodizing bath, has a total thickness in the example of the order of 20 microns (micrometers).
  • the pattern 11 is thus in the example slightly raised on the surface of the anodized section, a few micrometers.
  • the anodization layer 15 advantageously covers at least the edge of the mixed layer 14 aluminum and ceramic. Alternatively, it is possible to ensure that the free surface of the anodizing layer is located above the level of the free surface of the pattern so that the latter is ultimately recessed relative to the anodizing.
  • Figures 7 to 13 show examples of patterns made according to the example method described above on profiles according to the invention.
  • Figures 11 and 13 which represent perspective views of the profile alone
  • Figures 7, 8, 9 , and 10 represent a lower angle of a building opening closure frame, comprising an opening and a frame.
  • the figure 12 shows a lower chassis beam.
  • Each pattern 11 is shown in the black figures on a profile 10 shown on a gray background, solely for the purpose of contrasting representation, and constitutes a pattern 11 which extends for example longitudinally along the length of the profile 10 and preferably on a flat visible face of the profile.
  • a pattern 11 may be composed of a sequence of a given length much shorter than the length of the profile, said sequence being reproduced several times over the length of the section 10, or be original over the extent of this length.
  • the pattern may adopt various representations and be composed for example of lines and points combined ( figure 7 ), or exclusively of points assembled for example geometrically ( figure 8 on which the design of the pattern 11 has been shown in addition to the front view superimposed on the figure).
  • the pattern 11 may also consist of adjacent curved wire sections ( figure 9 ), or points distributed randomly ( figure 10 ), or straight lines that intersect ( figure 11 ), or geometric figures (triangles - Figures 12 and 13 ).
  • the pattern 11 appears on a profile 10 constituting the opening, but a similar or different pattern can be made also on the constituent section of the frame.
  • a choice of patterns to infinity can be proposed for a section and associated with it according to the method according to the invention.
  • the Figures 7 to 13 show an aluminum-based metal profile according to the invention having on an outer surface thereof a pattern 11 comprising a sintered powder which extends over a first part of this outer surface, advantageously of longitudinal extension. corresponding to the length of the profile and having a smaller area than said outer surface.
  • the second portion of said outer surface of the aluminum-based metal profile which is complementary to the first portion to form the entire surface of said outer surface, having a protective coating formed of an anodic oxide layer.
  • the outer surface in question corresponds to the main face of the section constituting the amount that is exposed to the view. This main face extends in a plane parallel to the plane of the frame.
  • the process according to the invention can be applied to any aluminum-based metal profile.

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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)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Powder Metallurgy (AREA)
EP12352004.1A 2011-10-26 2012-10-18 Procédé de finition anodisée d'un profilé métallique à base d'aluminium, avec motif et profilé ainsi obtenu. Active EP2586894B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1159738A FR2981951B1 (fr) 2011-10-26 2011-10-26 Procede de finition anodisee d'un profile metallique a base d'aluminium, avec motif, et profile ainsi obtenu

Publications (2)

Publication Number Publication Date
EP2586894A1 EP2586894A1 (fr) 2013-05-01
EP2586894B1 true EP2586894B1 (fr) 2013-12-04

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EP12352004.1A Active EP2586894B1 (fr) 2011-10-26 2012-10-18 Procédé de finition anodisée d'un profilé métallique à base d'aluminium, avec motif et profilé ainsi obtenu.

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EP (1) EP2586894B1 (es)
ES (1) ES2448423T3 (es)
FR (1) FR2981951B1 (es)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4536866B2 (ja) * 1999-04-27 2010-09-01 キヤノン株式会社 ナノ構造体及びその製造方法
US7432218B2 (en) * 2004-09-01 2008-10-07 Canon Kabushiki Kaisha Method for producing porous body
JP4727226B2 (ja) * 2004-12-28 2011-07-20 三菱重工業株式会社 表面処理された軽合金部材およびその製造方法
JP4603402B2 (ja) * 2005-03-31 2010-12-22 富士フイルム株式会社 微細構造体およびその製造方法
US20080003411A1 (en) * 2006-06-29 2008-01-03 Joseph Hunter Aluminum lithographic substrate and method of making
DE102007028741B4 (de) * 2006-07-12 2017-09-07 Heidelberger Druckmaschinen Ag Verfahren zum Herstellen eines Bedruckstoff kontaktierenden Elements
JP4294661B2 (ja) * 2006-07-26 2009-07-15 国立大学法人東北大学 基板ステージ、熱処理装置および基板ステージの製造方法
US20110048958A1 (en) * 2009-09-02 2011-03-03 Gm Global Technology Operations, Inc. Methods of reducing surface roughness and improving oxide coating thickness uniformity for anodized aluminum-silicon alloys

Also Published As

Publication number Publication date
ES2448423T3 (es) 2014-03-13
FR2981951B1 (fr) 2013-11-01
EP2586894A1 (fr) 2013-05-01
FR2981951A1 (fr) 2013-05-03

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