EP2467512B1 - Pièce moulée et/ou structurale en aluminium ou alliage d'aluminium et procédé pour protéger sa surface - Google Patents

Pièce moulée et/ou structurale en aluminium ou alliage d'aluminium et procédé pour protéger sa surface Download PDF

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Publication number
EP2467512B1
EP2467512B1 EP10742745.2A EP10742745A EP2467512B1 EP 2467512 B1 EP2467512 B1 EP 2467512B1 EP 10742745 A EP10742745 A EP 10742745A EP 2467512 B1 EP2467512 B1 EP 2467512B1
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Prior art keywords
sol
component
gel
gel system
aluminium
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German (de)
English (en)
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EP2467512A2 (fr
Inventor
Wolfgang Sterzl
Volkmar Gillich
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Strojmetal Aluminium Forging GmbH
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Strojmetal Aluminium Forging GmbH
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    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/122—Inorganic polymers, e.g. silanes, polysilazanes, polysiloxanes
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1229—Composition of the substrate
    • C23C18/1241—Metallic substrates
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1254—Sol or sol-gel processing
    • 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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1295—Process of deposition of the inorganic material with after-treatment of the deposited inorganic material

Definitions

  • the invention relates to a method for producing a shaped and / or structured part made of aluminum or an aluminum alloy with a corrosion protection layer resulting from a sol-gel system according to the preamble of claim 1.
  • Such structural and structural parts are manufactured using manufacturing processes or combinations of different manufacturing processes according to DIN 8580. These include, in particular, methods of the main groups altering primary forms, forming, separating and material properties. By combining different moldings such manufactured parts can also be connected to each other by assemblies of the main group joining to assemblies or structures. On the basis of intended for load-bearing forgings, which represent a significant product group within the invention relating to the form and structural parts, the prior art and the problem and its solution according to the invention is shown.
  • Forging particular forgings made of aluminum and its alloys are known.
  • forging stock for example cast, rolled or extruded blanks, in bars, as rods, bar sections, billets or slabs of aluminum or aluminum alloy in a die via one or more forming stages processed forging.
  • Forming stages include preforming such as upsetting, bending, stretching, stretch and cross wedge rolling, pre-forging, finish forging, post-forming and calibrating.
  • the actual forging process can be followed by metal and alloy-specific heat treatments, in particular in order to achieve the technological state (for example T4, T5, T6 or T73) in accordance with DIN EN 515.
  • a surface treatment such as pickling or blasting.
  • Known, claimable on load forgings have various disadvantages in terms of their susceptibility to corrosion. They may be exposed to improper storage, transport or use in adverse, especially humid or pollutant, environment, corrosion attacks, u.a. lead to optical, dimensional and / or mechanical quality losses on the component surface.
  • Forgings which, in addition, are operatively corrosive media, e.g. Salt solutions, brake dust or the like are exposed to an intensified and accelerated corrosion attack.
  • the nature of the corrosion attack for example stress corrosion cracking, intergranular corrosion or layer corrosion is dependent on the alloy and its technological state as well as on the type and concentration of the corrosion-causing media and the prevailing process parameters, such as temperature.
  • the invention is based on the object, a cost and as simple as possible manufacturable weather-resistant and corrosion-proof, with a Specify against mechanical influences sufficiently resistant surface protection provided molding and / or structural part of aluminum or an aluminum alloy and a method for its preparation.
  • the part should be characterized by a very good surface finish, homogeneous topography and low roughness.
  • the appearance should be visually appealing even after long-term use, especially under harsher environmental conditions.
  • the molded and / or structural parts are distinguished by good mechanical properties and equally good machinability.
  • the molded and / or structural parts could be tested with the same non-destructive test methods as are used in conventionally produced molded and / or structural parts.
  • the invention is based on the idea to provide the mold and / or structural part with a corrosion protection layer, which is made of a sol-gel system, ie created, wherein the corrosion protection layer is realized directly on the aluminum or aluminum alloy. In other words, any intermediate layer between the anticorrosion layer and the aluminum or the aluminum alloy is dispensed with.
  • the invention is based on the finding that the corrosion layer in such components surprisingly without a considered necessary in the prior art
  • Intermediate layer (there reflection layer) firmly adheres directly to the aluminum or aluminum alloy.
  • an intermediate layer for example a reflection layer
  • an intermediate layer as in known reflection aluminum parts, for example by means of pre-anodizing, chromating or phosphating, can be dispensed with for improved adhesion of the cover layer.
  • the process chain transport of parts, logistics, quality assurance
  • the absence of an intermediate layer leads to low material and energy costs.
  • the corrosion layer realized directly on the aluminum or the aluminum alloy is a sol-gel lacquer which has developed from a sol-gel system applied directly to the aluminum or the aluminum alloy.
  • Gels are dimensionally stable, easily deformable, fluid-rich disperse systems consisting of a solid, irregular, three-dimensional network and a liquid.
  • a sol-gel system is to be understood as meaning a sol-gel lacquer produced by the sol-gel technology which, after product-appropriate application and curing, bonds to the substrate - in this case a molded part or structural part - hardened, protective layer forms.
  • the protective layer is preferably a transparent curing sol-gel lacquer, which reveals the color tone of the metallic substrate.
  • sol-gel lacquer By transparent hardening sol-gel lacquer is to be understood in particular a clear, colorless, transparent protective layer.
  • the protective layer applied to the cleaned surface of the substrate is a sol-gel lacquer of a polysiloxane and advantageously a sol-gel lacquer of a polysiloxane prepared from an alcoholic silane solution, in particular an alkoxysilane solution and an aqueous colloidal silicic acid solution ,
  • Polysiloxane is the term for polymers of crosslinked siloxanes.
  • the polysiloxane is produced in particular by a condensation reaction between hydrolyzed and crosslinkable silanes, in particular alkoxysilanes, and colloidal silica.
  • the condensation reaction between hydrolyzed silanes, in particular alkoxysilanes, with one another and hydrolyzed silanes, in particular alkoxysilanes, and colloidal silica leads to the formation of an inorganic network of polysiloxanes.
  • organic groups in particular alkyl groups or simple alkyl groups, are incorporated into the inorganic network via carbon bonds.
  • the organic groups, or the alkyl groups do not directly participate in the polymerization or crosslinking of the siloxanes, i. they do not serve to form an organic polymer system but merely for functionalization.
  • the function is that the organic groups, in particular the alkyl groups, are attached to the outsides of the polysiloxanes during the sol-gel process and thereby form an outwardly water-repellent layer, which gives the sol-gel coating a pronounced hydrophobic property.
  • sol-gel process described leads, as mentioned, by targeted hydrolysis and condensation of alkoxides of silicon and silica to form a sol-gel lacquer of an inorganic network with incorporated alkyl groups.
  • the polysiloxanes obtained thereby are more likely to be assigned to the inorganic polymers.
  • the solution A is an alcoholic solution of one or more different alkoxysilanes, wherein the alkoxysilanes are present in an anhydrous medium in non-hydrolyzed form.
  • an alcohol such as methyl, ethyl, propyl or butyl alcohol and preferably isopropyl alcohol is suitably used.
  • alkoxysilanes are described by the general formula X n Si (OR) 4-n in which "R” is a simple alkyl, preferably from the group comprising Methyl, ethyl, propyl and butyl. "X" is suitably also an alkyl, preferably from the group comprising methyl, ethyl, propyl and butyl.
  • Suitable alkoxysilanes are, for example, tetramethoxysilanes (TMOS) and preferably tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMOS) and further alkoxysilanes.
  • the solution A is prepared from tetraethoxysilane (TEOS) and / or methyltrimethoxysilane (MTMOS) with a methyl, ethyl or propyl alcohol and in particular with an isopropyl alcohol as solvent.
  • the solution A may e.g. 25-35 wt.% (Wt.%), In particular 30 wt.%, TEOS and 15-25 wt.%, In particular 20 wt.%, Containing MTMOS, both dissolved in 40-60 wt. , in particular 50 wt .-%, isopropyl alcohol.
  • Solution B contains colloidal silica dissolved in water.
  • the solution B is adjusted to a pH of between 2.0-4, preferably between 2.5-3.0 and especially 2.7, by means of acid, preferably by means of nitric acid (HNO 3 ).
  • the silicic acid used is expediently a silicic acid stabilized in an acidic medium, the pH of the silicic acid advantageously being 2 -4.
  • the silicic acid is advantageously as low in alkali as possible.
  • the alkali content (eg, Na 2 O) of the silica is preferably below 0.04% by weight.
  • Solution B contains, for example, 70-80% by weight, in particular 75% by weight, of water as solvent and 20-30% by weight, in particular 25% by weight, of colloidal silica.
  • Solution B is conveniently adjusted to a pH of between 2.0-3.5, preferably between 2.5-3.0 and especially 2.7, by means of nitric acid (HN0 3 ).
  • a condensation reaction occurs in which, with the elimination of water, a siloxane bond (Si-O-Si) is built up from two Si-OH groups in each case.
  • a siloxane bond (Si-O-Si) is built up from two Si-OH groups in each case.
  • Progressive polymerization results in a network of polysiloxanes to which alkyl groups are attached.
  • the new mixed solution is in a gel state.
  • the two solutions A and B are preferably mixed in a weight ratio of 7: 3 parts.
  • the sol-gel lacquer is expediently applied or deposited in gel form onto the mold or structural part, or onto the corresponding surface, and then dried or cured.
  • the drying process consists in expelling the water and alcohols remaining in the sol-gel lacquer, whereby the sol-gel lacquer cures and a corrosion-resistant and weather-resistant protective layer is formed on the molded part or structural part surface.
  • the coating is carried out, for example, by applying, spinning or spraying, expediently in a continuous process, which is suitable for the treatment of mold or structural parts described above, even in very large quantities (large series).
  • Particularly preferred coating methods are spraying, spraying, dipping or dip coating.
  • sol-gel systems which are available, for example, under the trade name CERAPAINT of the company Akzo Nobel are suitable for the formation of the corrosion protection layer.
  • Corrosion protection layers which are created by applying a sol-gel system, ie the coating of the actual mold and / or structural part with a sol-gel system, require their preparation a curing or drying process in which the sol-gel system is converted into the durable sol-gel varnish.
  • the mold or structural part coated with the sol-gel lacquer is expediently used by means of radiation, such as UV radiation, electron radiation, laser radiation, or by thermal radiation, such as IR radiation (infrared), or by convection heating or a combination of the abovementioned drying process. or hardening process, dried or hardened.
  • radiation such as UV radiation, electron radiation, laser radiation, or by thermal radiation, such as IR radiation (infrared), or by convection heating or a combination of the abovementioned drying process. or hardening process, dried or hardened.
  • the convection heating can be carried out expediently by exposure to heated gases, such as air, nitrogen, noble gases or mixtures thereof.
  • heated gases such as air, nitrogen, noble gases or mixtures thereof.
  • the sol-gel lacquer layer is preferably dried or hardened in a continuous oven.
  • the sol-gel system is hardened by a heat treatment step provided for optimizing the component properties, so that a separate (additional) curing step can be dispensed with. If such a heat treatment, as is useful in particular for forgings intended or designed for load bearing, is not realized, a corresponding hardening step must be integrated into the production process.
  • the application of the sol-gel system can be integrated into the existing production environment inline or as a bypass process stage with little effort, in particular during the formation of the molded and / or structural part as a forging-specific forged part.
  • the molded and structural parts formed according to the concept of the invention may be made of pure aluminum or an aluminum alloy.
  • Prefers The forgings contain aluminum alloys of the material groups 2xxx, 6xxx or 7xxx or consist of these.
  • the alloys AA 2014, AA 2014A, AA 2017A, AA 2024 and 2618A are preferably used; in the wrought alloys of material group 7xxx, the alloys AA 7003, AA 7018, AA 7020, AA 7022 and AA 7075 are preferred Use, particularly preferably AA 7075.
  • wrought alloys of the material group 6xxx are preferably the alloys AA 6005, AA 6005A, AA 6008, AA 6014, AA 6060, AA 6061, AA 6063, AA 6063A, AA 6056, AA 6066, AA 6110, AA 6110A, AA 6182, AA 6401 and AA 6463 are used, particularly preferably the alloys AA 6060, AA 6063 and AA 6082 and AA 6110, in particular AA 6082.
  • moldings and structural parts according to the invention can also be made from magnesium and magnesium casting and wrought alloys be.
  • the invention farm and / or structural parts with a corrosion protection layer which have emerged from a sol-gel system, are characterized by a smooth, extremely thin, homogeneous, decorative and transparent protective layer that meets the static and dynamic requirement profile of high-quality forgings becomes.
  • Such coated parts that are subjected to static loading in a corrosive environment have a flawless surface appearance even after long term exposure.
  • the farm or structural parts according to the invention have no signs of corrosion after 1000 hours salt spray test (test DIN 50021 -SS) according to DIN 50021.
  • the novel structural or structural parts under these conditions on no Filiformkorresion in the sense of DIN EN ISO 3665 on. Coated farm and / or structural parts, in particular forgings subjected to dynamic-corrosive stress, allow for higher numbers of cycles than uncoated molded and / or structural parts as a result of a delayed corrosion attack.
  • the coated according to the concept of the invention farm and structural parts, in particular due to the small thickness of the corrosion protection layer and the sufficiently plastic material behavior and the consistency of the farm and / or structural parts, in particular corrosion protection layer, as well as non-coated farm and / or structural parts, in particular forgings of a non-destructive component test, for example, measurement of the conductivity or the Brinellhärte be subjected.
  • a non-destructive component test for example, measurement of the conductivity or the Brinellhärte be subjected.
  • the fracture surface of the surface coating is congruent with the fracture surface of the base material; This means that there are no protruding or released particles or splinters, which could cause a risk of injury if touched.
  • the farm and / or structural parts with a corrosion coating formed according to the concept of the invention can thus be machined even after a surface finish with high dimensional accuracy.
  • the coated forged parts described above can be excellently machined, have very good, i. very high, static-mechanical and dynamic-mechanical characteristics and have a high degree of environmental compatibility.
  • the design of the designed according to the concept of the invention farm and / or structural parts can be made according to customer requirements, especially those of the automotive industry.
  • a significant advantage of the parts, in particular the forgings intended for load bearing, is that constructive safety margins and load-bearing cross-sections can be reduced in comparison to forged parts according to the prior art, since the occurrence of corrosion phenomena is at least considerably delayed.
  • the molded and / or structural parts are forgings, even more preferably forged (supporting) forgings.
  • the forgings are designed for load-bearing, i. in the installed state (load-) bearing.
  • the forgings (load-bearing parts) intended for receiving loads are preferably drop-forged parts.
  • the forged parts in question for load bearing are supporting and / or heavily stressed parts in vehicles, in particular motor vehicles.
  • the shaped and / or structured part is, for example, a cast part, a pressed part, an extrusion part or a part produced by forming a sheet metal.
  • Forging intended certain forgings are preferably made of hardenable aluminum alloys and provided for the purpose of their use with a strength-enhancing heat treatment.
  • the component is quenched at temperatures of 460 ° C - 550 ° C in the solution-annealed condition, for example with air or water, and then hot-aged at temperatures of 80 ° C - 200 ° C.
  • Sol-gel systems which are distinguished by at least one of the following parameters and / or substances are particularly suitable for the preparation of the anticorrosion layer (sol-gel lacquer):
  • An aqueous colloidal silica which, in an appropriate combination with an alcoholic silane solution, in particular an alkoxysilane solution by hydrolysis, condensation and drying leads to the formation of a sol-gel lacquer of crosslinked polysiloxanes.
  • sol-gel systems which are obtainable, for example, under the trade name CERAPAINT from Akzo Nobel.
  • the abovementioned sol-gel systems and the anticorrosive layers produced therefrom are distinguished by a chemical composition which permits immediate melt-technological recycling of the coated forgings, without it being necessary to remove the corrosion protection layer chemically or mechanically. It can therefore be avoided additional environmental measures before recycling.
  • All of the aforementioned sol-gel types are non-toxic, odorless and non-corrosive and thus processable without increased safety and protective measures.
  • the corrosion protection layer has an extremely small thickness.
  • the thickness is less than 10 m. more preferably less than 5 m. in particular 2 m to 4 m.
  • a minimum thickness of 0.5 m is not exceeded.
  • a small thickness of the corrosion protection layer leads to a minimized weight gain.
  • an increased lightweight construction potential is offered compared to conventional coating systems.
  • the structural and / or structural part is a motor vehicle component, very particularly preferably a safety-relevant, i. supporting, and / or for receiving power, motor vehicle component, in particular a bumper, a side impact beam or a component of the chassis of the motor vehicle, such as a trailing arm, semi-trailing arm, support arm or wishbone.
  • motor vehicle component in particular a bumper, a side impact beam or a component of the chassis of the motor vehicle, such as a trailing arm, semi-trailing arm, support arm or wishbone.
  • the forging as part of a wheel or engine mount of a motor vehicle.
  • the form and / or structural part for example, as a link, expediently be designed as a hinge or fitting.
  • training as a hydraulic component or as a fitting or seat attachment can be realized.
  • the molded and / or structural part can be formed as a decorative automotive component, in particular for the vehicle interior. Also, the realization of the molded and / or structural part as an exterior automotive component, for example as exterior mirror housing, door handle or roof rail is possible.
  • the molded and / or structural part in particular the forging, as a load-bearing part for applications in the construction industry.
  • an anti-corrosion forged load-bearing forging is suitable for offshore applications where very harsh environmental conditions prevail.
  • the forgings can also be used, in particular as load-bearing parts, in aviation, the electrical industry or the transport industry.
  • the invention also leads to a method for producing a shaped and / or structured part, in particular a forged part, which is characterized by a corrosion protection layer (sol-gel lacquer) which consists of a sol-gel System emerged.
  • the core of the method is to wet or coat the preferably forged, in particular drop-forged, component made of aluminum or an aluminum alloy with a sol-gel system, from which the corrosion protection layer is then formed, if necessary a curing or drying and / or heat treatment process downstream of the coating process.
  • the process can be integrated inline or as a bypass process stage with little effort into an existing production line.
  • the sol-gel system for the formation of the corrosion layer is hardened by a heat treatment, in that the accelerated curing takes place combinatorially with the heat treatment used for forgings in the hot-aged state.
  • the increased temperature for combinatorial drying or hardening of the sol-gel lacquer and the material-specific heat treatment is greater than 80 ° C., preferably greater than 115 ° C. and in particular greater than 140 ° C.
  • the elevated temperature is less than 210 ° C.
  • the elevated temperature is more preferably between 150 ° C and 200 ° C.
  • the application of the sol-gel lacquer before or during the heat aging so that can be dispensed with a separate curing step.
  • the coating methods for applying the sol-gel system to the aluminum or aluminum alloy component which may have a smooth, blasted or structured surface
  • Spraying, spraying and / or immersion or immersion drawing processes are preferred here.
  • the expediently degreased or pickled and subsequently rinsed or cleaned component made of aluminum or an aluminum alloy before and / or after the application and / or curing of the sol-gel system is post-processed, for example by means of a cutting separation process with geometric indeterminate or particular cutting or a non-cutting separation process in which no formless substance in the Result of chips is obtained (eg shearing, fine blanking).
  • a post-processing by thermal, chemical and / or electro-chemical removal methods, for example, in the sense of DIN standard 8580, possible.
  • the anti-corrosive layer made of a sol-gel system allows the processing after the formation of the corrosion protection layer, ie after curing of the sol-gel system, since the corrosion protection layer due to the arrangement directly on the aluminum or the aluminum alloy does not flake off in the Processing tends and insofar as the non-directly processed areas remain optimally protected against corrosion attacks.
  • the invention also leads to the use of a sol-gel system, in particular of sol-gel lacquer of a polysiloxane and advantageously a sol-gel lacquer of one of an alcoholic silane solution, in particular an alkoxysilane solution and an aqueous colloidal Silica solution prepared polysiloxane to form a corrosion protection layer, preferably with a decorative appearance, on a forged component made of aluminum or an aluminum alloy.
  • a post-processed or destructively tested component preferably has no filiform corrosion due to the good layer adhesion and the congruence of the parting surfaces of the coating and the base material.
  • a post-processed or destructively tested component due to the good layer adhesion and the congruence of the separation surfaces of the coating and the base material no risk of injury (such as by scharkantige particles or edge overhang) on.
  • a molded and / or structural part produced by means of the method according to the invention is characterized by a chemical composition of the anticorrosive coating, which is a direct melting-technological recycling of the coated molded or structural parts allows, without prior chemical and / or mechanical removal of the corrosion protection layer.
  • Fig. 1 shows a schematic representation of a designed as a support arm of a motor vehicle, designed for load receiving mold and / or structural part 1, here a forging.
  • Fig. 3 shows a sectional view of this forging 1.
  • Fig. 2 exemplified is designed as a wishbone form and / or structural part 1 for a motor vehicle, wherein in Fig. 4 the corresponding sectional view is reproduced.
  • Fig. 5 shows a detail of the sectional views according to the 3 and 4 of the forging 1. It can be seen that the mold and / or structural part 1 comprises a body 3 made of an aluminum alloy 4, wherein the aluminum alloy 4 is provided directly, ie without providing an intermediate layer, with a corrosion protection layer 2 having a thickness of about 2 m.
  • the anticorrosive layer 2 results from a sol-gel system, which was preferably applied by spraying, spraying, dipping or immersion of the forged component on this. Hardened, i. is converted into the corrosion protection layer 2, the sol-gel system by a heat treatment of the molded and / or structural part 1, here the forging, which simultaneously leads to an optimization of the mechanical characteristics, such as the strength of the component. An additional curing step can thus be dispensed with with advantage.

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  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Dispersion Chemistry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Chemically Coating (AREA)

Claims (10)

  1. Procédé de fabrication d'une pièce moulée et/ou structurale (1) en aluminium ou en un alliage d'aluminium (4), avec une couche (2) de protection contre la corrosion, obtenue à partir d'un système sol-gel, dans lequel
    - on fabrique d'abord un composant en aluminium ou en un alliage d'aluminium (4),
    - on applique directement sur l'aluminium ou l'alliage d'aluminium (4) un système sol-gel, et on le convertit en une couche de protection contre la corrosion,
    caractérisé en ce que
    le système sol-gel subit un durcissement pour former la couche de protection contre la corrosion (2), où
    le système sol-gel comprend un vernis sol-gel en un polysiloxane, et où
    le durcissement du système sol-gel est mis en oeuvre grâce au traitement thermique du composant pour optimiser les propriétés du composant, en particulier ses propriétés structurales, à l'état vieilli à chaud en combinaison avec le traitement thermique utilisé pour la pièce structurale (1), à une température comprise entre 80 et 210°C.
  2. Procédé selon la revendication 1, dans lequel le durcissement du système sol-gel est mis en oeuvre par le traitement thermique à une température comprise entre 150 et 200°C.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le vernis sol-gel est appliqué avant ou pendant le vieillissement à chaud.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le composant est façonné à partir d'une ébauche par des procédés de fabrication selon DIN 8580 et suivants, de préférence par forgeage, en particulier par matriçage.
  5. Procédé selon les revendications 1 à 4, caractérisé en ce que les pièces forgées, destinées à supporter une charge, sont fabriquées en des alliages d'aluminium durcissables et, selon leur application, sont soumises à un traitement thermique augmentant leur résistance mécanique.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que le composant subit, selon le matériau, une trempe à des températures de 460 à 550°C à l'état recuit de mise en solution, de préférence avec de l'air ou de l'eau, puis subit un vieillissement à chaud à des températures de 80 à 200°C.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la couche de protection contre la corrosion (2) présente une épaisseur comprise dans une plage d'épaisseurs de 0,5 µm à 10 µm, de préférence de 1,0 µm à 5 µm, préférentiellement de 2,0 µm à 4 µm.
  8. Procédé selon l'une des revendications 1 à 7, caractérisé en ce que le système sol-gel est appliqué par pulvérisation, aspersion, par trempage ou par trempage-retrait du composant, ou par une combinaison d'au moins deux des méthodes mentionnées ci-dessus.
  9. Procédé selon l'une des revendications 1 à 8, caractérisé en ce que le composant subit un post-usinage avant et/ou après l'application et/ou le durcissement du système sol-gel, en particulier à l'aide d'un procédé de séparation avec ou sans enlèvement de copeaux ou par des procédés d'enlèvement thermiques, chimiques et/ou électrochimiques.
  10. Procédé selon l'une des revendications 1 à 9, caractérisé en ce que le composant subit un traitement superficiel, en particulier par décapage ou grenaillage, avant l'application du système sol-gel.
EP10742745.2A 2009-08-19 2010-08-03 Pièce moulée et/ou structurale en aluminium ou alliage d'aluminium et procédé pour protéger sa surface Active EP2467512B1 (fr)

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PL10742745T PL2467512T3 (pl) 2009-08-19 2010-08-03 Część kształtowa i/lub strukturalna z aluminium lub stopu aluminium i sposób ochrony jego powierzchni

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009037928A DE102009037928A1 (de) 2009-08-19 2009-08-19 Form- und/oder Strukturteil aus Aluminium oder einer Aluminiumlegierung und Verfahren zu deren Oberflächenschutz
PCT/EP2010/004730 WO2011020556A2 (fr) 2009-08-19 2010-08-03 Pièce moulée et/ou structurale en aluminium ou alliage d'aluminium et procédé pour protéger sa surface

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EP2467512A2 EP2467512A2 (fr) 2012-06-27
EP2467512B1 true EP2467512B1 (fr) 2016-09-14

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DE (1) DE102009037928A1 (fr)
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EP2570257B1 (fr) * 2011-09-15 2021-05-12 Hydro Aluminium Rolled Products GmbH Matière première composite en aluminium dotée d'une couche d'alliage centrale AIMgSi
DE102012204636A1 (de) 2012-03-22 2013-09-26 Nanogate Ag Behandlung einer anodisch oxidierten Oberfläche
DE102013103469A1 (de) 2013-04-08 2014-10-09 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Kraftfahrzeug-Fahrwerksbauteils
DE102015111440B4 (de) 2015-07-15 2023-07-13 Plasman Europe Ab Verfahren zur Behandlung einer anodisch oxidierten Oberfläche aus Aluminium oder einer Aluminiumlegierung und beschichtete Aluminiumoberfläche, die aus einem derartigen Verfahren erhalten wird
DE102017213552A1 (de) * 2017-08-04 2019-02-07 Siemens Aktiengesellschaft Nutenstein, Schienenfahrzeug sowie Verwendung und Herstellungsverfahren eines Nutensteins

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DE19714949A1 (de) * 1997-04-10 1998-10-15 Inst Neue Mat Gemein Gmbh Verfahren zum Versehen einer metallischen Oberfläche mit einer glasartigen Schicht
EP1154289A1 (fr) 2000-05-09 2001-11-14 Alcan Technology & Management AG Réflecteur

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WO2011020556A2 (fr) 2011-02-24
WO2011020556A3 (fr) 2011-05-26
DE102009037928A1 (de) 2011-02-24
ES2607434T3 (es) 2017-03-31
PL2467512T3 (pl) 2017-05-31
EP2467512A2 (fr) 2012-06-27

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