EP3129527B1 - Procédé de passivation d'une surface métallique - Google Patents

Procédé de passivation d'une surface métallique Download PDF

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Publication number
EP3129527B1
EP3129527B1 EP15712058.5A EP15712058A EP3129527B1 EP 3129527 B1 EP3129527 B1 EP 3129527B1 EP 15712058 A EP15712058 A EP 15712058A EP 3129527 B1 EP3129527 B1 EP 3129527B1
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Prior art keywords
layer
component
light metal
passivation solution
coating
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EP15712058.5A
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German (de)
English (en)
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EP3129527A1 (fr
Inventor
Michael Grabowski
Daniel BLUCHER
Michael Korte
Matthias Brettmann
Sannakaisa Virtanen
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Audi AG
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Audi AG
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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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/22—Orthophosphates containing alkaline earth metal cations
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/22—Servicing or operating apparatus or multistep processes

Definitions

  • the invention relates to a method for passivating a metallic surface of a light metal component according to the preamble of claim 1.
  • light metal components are common practice across industries.
  • vehicle bodies in mixed construction for example, made of light metal and sheet steel parts to achieve a weight reduction.
  • aluminum or magnesium materials or alloys thereof can be used as the light metal.
  • a method for painting vehicle bodies is known. Consequently, the body shell is subjected to pre-treatment before the actual painting process, in which bodies are first degreased in a spray and Volltauchzone. Subsequently, the cleaned vehicle bodies are coated in a phosphating bath with a zinc phosphate layer. This serves as additional corrosion protection and as a primer for the subsequent primer. Subsequent to this pretreatment step, a cataphoresis primer is applied in the dipping process, in which the paint particles dissolved in the dipping bath are attracted to the body panel under applied electrical direct voltage and there to form a primer stick to it.
  • the primed vehicle body is conveyed in a downstream continuous furnace in which the primer is baked.
  • the provided with the primer vehicle body is led to another coating station in which a top coat is done in the desired color by the customer.
  • the paint particles can be transported by an electrostatic field of high voltage standing support heads to the grounded body.
  • This topcoat is also followed by a continuous furnace in which curing of the topcoat takes place at high temperature.
  • a clearcoat is applied in a further coating station, which is also cured at high temperature in a subsequent drying step.
  • the light metal components are more susceptible to corrosion than the steel components. Especially paint undercuts and filiform corrosion are more common damage patterns.
  • a pickling passivation and the application of an anodic coating is common practice.
  • the commercial coatings only partially provide the necessary protective effect against self-corrosion, filiform corrosion and / or paint infiltration. Especially when in contact with magnesium, the high potential difference should be regarded as promoting corrosion.
  • DE102010060700 A discloses a corrosion protection method that is suitable for use in mixed construction.
  • the commercially available coating systems for light metal components do not exhibit sufficient passivating behavior and are often too “noble” (that is to say too high corrosion potentials), especially with respect to magnesium. If magnesium alloys are electrochemically polarized by contact with more noble metals (eg aluminum), an exponential increase of the corrosion current occurs.
  • the object of the invention is to provide a method for passivating the metallic surface of a light metal component, in which In particular with aluminum or magnesium, a sufficient passivation is achieved and a contact corrosion risk is reduced.
  • the invention is based on the idea of orienting the composition of the passivation solution, at least in principle, to the composition of human blood. Surprisingly, it has been found that certain components of human blood produce a protective and passivating coating on metal surfaces, especially of light metal such as aluminum and / or magnesium. In a specific embodiment of the invention, concentrations of individual constituents can be simulated essentially unchanged in the passivation solution. Against this background, a special passivation step takes place in which a calcium phosphate-containing conversion layer which comprises oxides and hydroxides of the component material and of the passivation solution and contains amino acids is produced on the metallic component surface using an aqueous, in particular blood-like, passivation solution.
  • the light metal component formed with the passivated metallic surface can be used across industries.
  • the light metal component may optionally be used in the automotive sector, namely in a visible manner within the vehicle or as an externally visible outer part.
  • the light metal component can be realized as a vehicle-inner-side display frame, an aggregate part, a chassis part or a component of a seat frame structure.
  • the passivating anticorrosive primer (ie the conversion layer) produces a reduction of the self-corrosive currents by a factor of 10. In addition, an increase of the pitting potential by more than 0.5 V takes place with simultaneous reduction of the cathodic current densities.
  • the conversion layer according to the invention is very favorably in contact with nobler materials (such as aluminum or steel). In addition, with the conversion layer according to the invention, there is a reduction in the contact corrosion currents with aluminum, steel, zinc, carbon fibers or CFRP. Furthermore, there is an increase in the penetration resistance by application of the coating (that is, the higher the penetration resistance, the lower the corrosion currents, the penetration resistance behaves inversely proportional to the corrosion currents).
  • the conversion layer according to the invention generates low intrinsic corrosion currents and high passivity. In contact with aluminum and steel, only small contact corrosion currents result.
  • the passivation solution results in a compact calcium phosphate and aluminum hydroxide / oxide-containing coating with amino acids.
  • the layer morphology is constructed in the form of lumps, with intermediate cracks which, for example, provide a sufficiently large residual conductivity in the case of a subsequent KTL deposition in a coating process.
  • the liquid starting component of the primer can penetrate into the cracks, resulting in good adhesion between the conversion layer and the primer.
  • a compact calcium phosphate and magnesium hydroxide / oxide-containing coating is obtained, the layer morphology of which is also formed in a lump-shaped manner.
  • the passivation solution may preferably have at least the following constituents as activators for activating the metal surface of the component: NaCl with a concentration between 5500 and 7500, in particular 6400 mg / l; and or KCl with a concentration between 300 and 500, in particular 400 mg / l.
  • Both NaCl and KCl act as a source of chloride and assist in the activation of film formation which results in increased release of material ions from the surface of the device, which are necessary for film formation.
  • the passivation solution can have at least the following amino acids as catalysts and layer formers: D-Ca pantothenate with a concentration between 2 and 5, in particular 4 mg / l, and / or L-isoleucine with a concentration between 80 and 120, in particular 105 mg / l.
  • the amino acid L-isoleucine acts specifically as a layering agent that supports the adhesion of the conversion layer on the metallic component surface.
  • the passivation layer may preferably contain calcium phosphates.
  • the conversion layer may contain carbonaceous constituents.
  • the passivation solution may contain NaHCO 3 .
  • the formation of carbonate also depends on possibly supplied CO 2 .
  • the passivating solution may contain Na pyruvate, with a concentration between 90 and 150 mg / l, in particular 110 mg / l.
  • the aqueous passivating solution may contain at least the following constituents, the concentrations of which are reproduced in their concentrations in human blood: NaCl in particular 6400 mg / l KCl with in particular 400 mg / l NaH 2 PO 4 in particular 124 mg / l CaCl 2 in particular 200 mg / l NaHCO 3 in particular 3700 mg / l Na-pyruvate in particular 110 mg / l D-Ca pantothenate in particular 4 mg / l Myo-inositol with in particular 7.2 mg / l L-isoleucine in particular 105 mg / l
  • the passivation reaction according to the invention can be carried out at a pH of about 7. In this case, the coating reaction is slow. Alternatively, the coating reaction can also take place in the acidic range. The coating reaction can be accelerated by increasing the temperature, reducing the pH and / or by polarization and / or increasing the partial pressure of CO 2 .
  • the light metal component may be a vehicle part, which is first pretreated with the passivation solution according to the invention to form the conversion layer.
  • the conversion layer of the component can be covered with at least one further layer in a subsequent coating process.
  • the coating process has a first coating step, in which a light metal KTL layer, ie an organic protective layer, is formed. This is done in a dipping process (ie light metal KTL) under applied DC voltage, whereby the paint particles dissolved in the immersion bath are attracted to the metallic component and remain there to form the light metal KTL layer.
  • a powder coating is then applied. This is done in a powder coating process with applied DC voltage.
  • the special clod-shaped layer morphology with the crack structures already mentioned above is of particular importance. This ensures namely in the dipping process and in the powder coating process sufficient electrical residual conductivity through the conversion layer.
  • the light metal component for example as a visible outer part
  • the body shell is then subjected to a conventional body painting process together with the light metal component mounted thereon. That is, there is a cataphoresis primer of the body shell in the dipping process in which under applied electrical DC voltage dissolved in the immersion paint particles are attracted to the body shell and remain there to form a primer.
  • the primed body shell is conveyed into a downstream continuous furnace, in which the primer is baked.
  • the green body provided with the primer is led to another coating station in which a KTL process takes place.
  • the KTL process is also followed by a continuous furnace in which the KTL layer burns in at high temperatures.
  • a conventional automotive paint system applied which is also baked in a subsequent drying step at high temperature.
  • the light metal component mounted on the green body is already precoated with a layer structure, namely with the conversion layer, the light metal KTL layer and the powder coating.
  • the light metal component is thus electrically insulated, so that the electroplated in the bodyshell painting process KTL layer no longer adheres, while the conventional automotive paint system can be easily applied to the already coated light metal component.
  • Fig. 1 is shown in a greatly enlarged partial sectional view of the example of the layer structure 1 of a paint coating on the metal surface 25 of a body part 3.
  • the body part 3 made of light metal, such as aluminum, magnesium or an alloy thereof.
  • the layer structure 1 directly on the workpiece surface 25 of the light metal component 3, a conversion layer 5, which serves for passivation and corrosion protection.
  • the conversion layer 5 is coated by a light metal KTL layer 6.
  • a powder coating 7 is formed, on which a conventional automotive paint system 9 is applied.
  • the conversion layer 5 has a clod-shaped layer morphology, in which cracks 13 are formed between individual blocks 11.
  • the cracks 13 provide in a later described KTL coating process for a sufficient residual conductivity between a KTL dip and the light metal material of the component 3.
  • the liquid starting component of the light metal KTL layer 6 penetrate into the cracks and thereby increase the adhesive bond to the conversion layer 5.
  • the Fig. 1 as well as the others Fig. 2 to 7 , are made with a view to a simpler understanding of the invention. Therefore, the figures are only roughly simplified representations that do not reflect a realistic layer structure 1. Thus, the conversion layer 5 actually has a layer thickness which lies in the ⁇ m range.
  • a passivation step P (first) is carried out.
  • a degreasing, grinding and / or pickling of the component 3 is performed.
  • the thus cleaned component 3 is then subjected to a passivation according to the invention, in which it is immersed in a dipping bath of the passivation solution.
  • the composition of the aqueous passivating solution is basically based on the composition of human blood.
  • the passivation solution contains at least the following main components whose concentrations are identical to the concentrations in human blood: NaCl with 6400 mg / l KCl with 400 mg / l NaH 2 PO 4 with 124 mg / l CaCl 2 with 200 mg / l NaHCO 3 with 3700 mg / l Na-pyruvate with 110 mg / l D-Ca pantothenate with 4 mg / l Myo-inositol with 7.2 mg / l L-isoleucine with 105 mg / l
  • NaCl and KCl in the passivation solution serves to activate the metal surface 25.
  • the amino acids D-Ca-pantothenate and myo-inositol are mainly responsible for the coating process and also have a catalyzing effect.
  • the components NaH 2 PO 4 and CaCl 2 support the coating process by incorporating the Ca 2+ and PO 4 3- ions into the conversion layer 5.
  • the conversion layer 5 according to the invention also has carbonate-containing layer constituents. These are provided in the passivation solution by the component NaHCO 3 and CO 2 (from the atmosphere). Another component used for layer formation is the component Na pyruvate.
  • the above amino acids are also components of human blood whose concentrations are almost unchanged.
  • the passivation solution according to the invention is an aqueous treatment liquid whose pH is in the range of about 7 or in the acidic range.
  • the passivation takes place in the immersion bath at a treatment temperature in the range of 18 to 25 ° C.
  • the treatment time depends on the set pH value, the process temperature and optionally an additional polarization as well the required nominal thickness of the coating.
  • the component 3 is fed to a rinsing / drying process.
  • the coated with the conversion layer 5 component 3 is in the present application in the further process sequence (according to the Fig. 3 ) in a coating station 17 with a light metal KTL layer 6 (ie, an organic protective layer).
  • the light metal KTL coating is carried out in common practice in the dipping process in which an electrical DC voltage is applied between the body 1 and the dip tank, whereby the paint particles dissolved in the dipping bath are attracted to the component 3 and adhere uniformly there. Additionally required pre- or post-treatment steps are omitted for the sake of easier understanding of the invention.
  • a downstream drying station 18 the component 3 passes through a continuous furnace at a predetermined conveying speed, in which the light metal KTL layer 6 is baked at process temperatures in the range of, for example, 180 ° C.
  • a powder coating takes place in a coating station 20, in which layer 7 (FIG. Fig. 1 ) is applied to the component 3.
  • the paint particles are transported to the earthed component 3 by an electrostatic field from live pointing heads.
  • a further drying station 19 again a baking process in a continuous furnace.
  • the light metal component 3 is added in a possible exemplary application as a visible vehicle exterior part in a riveting to a not yet painted bodyshell 15.
  • the body shell 15 is in a continuous process in a body painting plant (see Fig. 4 ).
  • the primed shell body 15 is conveyed to a downstream continuous furnace 27, in which the primer is baked.
  • the green body 15 provided with the primer is led to a further coating station 29, in which a KTL process takes place.
  • the KTL process 29 is also followed by a continuous furnace 31, in which the coating is baked at high temperature.
  • a further coating station 33 a conventional automotive four-layer paint system 9 is applied, which is subsequently subjected to a baking process 35.
  • the Indian Fig. 4 shown body painting process is performed with pre-coated light metal component 3. That is, the light metal component 3 is electrically insulated, so that the applied in the bodyshell painting process KTL layer no longer adheres, whereas the conventional automotive paint system 9 (ie, a four-layer structure) can be readily applied to the powder coating 7 of the light metal component 3.
  • the conventional automotive paint system 9 ie, a four-layer structure
  • Fig. 5 to 7 is in views according to the Fig. 1 the light metal component 3 shown in different process steps. So is in the Fig. 5 the light metal component 3 with cleaned and exposed metallic surface 25 shown. In the Fig. 6 the light metal component 3 is shown after passivation and outsourcing. Accordingly, the conversion layer 5 is applied to the metallic surface 25 of the light metal component, namely with the Schollenmorphologie invention, that is, with lumpy individual fragments 11 and intermediate cracks 13. In the Fig. 7 is this Light metal component 3 shown after completed light metal KTL process, in which the starting component of the light metal KTL layer 6 soaks through the crack structure 13 of the conversion layer 5, whereby the adhesive bond between the conversion layer 5 and the light metal KTL layer 6 is substantially increased.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (12)

  1. Procédé de passivation d'une surface métallique (25) d'un élément en métal léger (3), dans lequel une couche de conversion (5) est appliquée sur la surface (25) de l'élément en métal léger (3) lors d'une étape de passivation (P), dans lequel la couche de conversion (5) contenant du phosphate de calcium est produite sur la surface de l'élément métallique (25) lors de l'étape de passivation (P) en utilisant une solution de passivation aqueuse, laquelle couche de conversion présente des oxydes et hydroxydes du matériau de l'élément et de la solution de passivation et contient des acides aminés, dans lequel la couche de conversion (5) de l'élément (3) est recouverte d'au moins une couche (6, 7, 9) lors d'un processus de revêtement (L) consécutif, dans lequel la valeur du pH de la solution de passivation se situe dans une plage allant de neutre à acide, caractérisé en ce que le processus de revêtement (L) présente une première étape de revêtement (I) lors de laquelle une couche KTL de métal léger (6), c'est-à-dire une couche protectrice organique, est formée, et ce lors d'un procédé de trempage avec application d'une tension continue, ce qui fait que les particules de vernis dissoutes dans le bain de trempage sont attirées par l'élément métallique (3) et adhèrent là en formant la couche KTL de métal léger (6).
  2. Procédé selon la revendication 1, caractérisé en ce qu'au moins la surface métallique (25) de l'élément (3) est formée par un métal léger, en particulier du magnésium, de l'aluminium ou des alliages de ceux-ci.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la solution de passivation présente comme activateurs destinés à l'activation de la surface métallique (25) de l'élément (3) au moins les constituants suivants :
    NaCl avec une concentration entre 5 000 et 8 000, en particulier 6 400 mg/l ; et/ou
    KCl avec une concentration entre 300 et 500, en particulier 400 mg/l.
  4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce que la solution de passivation présente comme catalyseurs et formateurs de couche au moins l'acide aminé suivant :
    D-Ca-pantothénate avec une concentration entre 2 et 20, en particulier 4 mg/l.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de passivation présente comme agent adhésif de couche au moins l'acide aminé suivant :
    L-isoleucine avec une concentration entre 90 et 150, en particulier 105 mg/l.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de passivation contient, pour aider à la formation de couche, au moins les constituants suivants qui sont intégrés comme fragments (c'est-à-dire Ca2+ ou PO4 3-) dans la couche de conversion :
    NaH2PO4 avec une concentration entre 100 et 170, en particulier 124 mg/l, et/ou
    CaCl2 avec une concentration entre 170 et 300, en particulier 200 mg/l.
  7. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche de conversion (5) présente, pour aider à la formation de couche, des constituants contenant du carbonate et en ce que, en particulier pour la fourniture des constituants contenant du carbonate, la solution de passivation contient du NaHCO3, et ce en particulier avec une concentration entre 3 500 et 4 500, en particulier 3 700 mg/l.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de passivation contient, pour aider à la formation de couche, du Na-pyruvate et en ce que la concentration de celui-ci est comprise entre 90 et 170 mg/l, en particulier est de 110 mg/l.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de passivation aqueuse contient au moins les constituants suivants dont les concentrations sont à l'image de leurs concentrations dans le sang humain : NaCl avec en particulier 6 400 mg/l KCl avec en particulier 400 mg/l NaH2PO4 avec en particulier 124 mg/l CaCl2 avec en particulier 200 mg/l NaHCO3 avec en particulier 3 700 mg/l Na-pyruvate avec en particulier 110 mg/l D-Ca-pantothénate avec en particulier 4 mg/l Myo-inositol avec en particulier 7,2 mg/l L-isoleucine avec en particulier 105 mg/l
  10. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la solution de passivation contient pour augmenter le comportement de revêtement, au moins un ou plusieurs, en particulier tous, les constituants suivants : L-arginine•HCl avec 50 à 120, en particulier 84 mg/l L-cystine avec 30 à 80, en particulier 48 mg/l L-histidine•HCl•H2O avec 25 à 65, en particulier 42 mg/l L-leucine avec 70 à 140, en particulier 105 mg/l L-lysine•HCl avec 110 à 170, en particulier 146 mg/l L-méthionine avec 20 à 50, en particulier 30 mg/l L-phénylalanine avec 40 à 80, en particulier 66 mg/l L-thréonine avec 60 à 120, en particulier 95 mg/l L-thryptophane avec 13 à 20, en particulier 16 mg/l L-tyrosine avec 40 à 90, en particulier 72 mg/l L-valine avec 60 à 120, en particulier 94 mg/l L-sérine avec 20 à 60, en particulier 42 mg/l Chlorure de choline avec 2 à 10, en particulier 4 mg/l Acide folique avec 2 à 10, en particulier 4 mg/l Nicotinamide avec 2 à 10, en particulier 4 mg/l Pyridoxal•HCl avec 2 à 10, en particulier 4 mg/l Riboflavine avec 0,2 à 1, en particulier 0,4 mg/l Thiamine-HCl avec 2 à 10, en particulier 4 mg/l
  11. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche de conversion (5) est réalisée avec une morphologie de couche (11), en forme de blocs, avec des structures de fissures (13) et en ce que la morphologie de couche (11) en particulier garantit lors de la première étape de revêtement (I) une conductivité électrique résiduelle suffisante entre le bain de trempage et le matériau de l'élément et/ou, par pénétration des composants de départ liquides de la couche KTL de métal léger (6), augmente une liaison adhésive entre la couche de conversion (5) et la couche KTL de métal léger (6).
  12. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le processus de revêtement (L) présente au moins une autre étape de revêtement (II) lors de laquelle au moins une couche (7) est appliquée, et ce dans un processus de revêtement par poudre avec application d'une tension continue.
EP15712058.5A 2014-04-11 2015-03-21 Procédé de passivation d'une surface métallique Active EP3129527B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014005444.6A DE102014005444A1 (de) 2014-04-11 2014-04-11 Verfahren zur Passivierung einer metallischen Oberfläche
PCT/EP2015/000622 WO2015154851A1 (fr) 2014-04-11 2015-03-21 Procédé de passivation d'une surface métallique

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EP3129527A1 EP3129527A1 (fr) 2017-02-15
EP3129527B1 true EP3129527B1 (fr) 2019-08-28

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US (1) US10351959B2 (fr)
EP (1) EP3129527B1 (fr)
CN (1) CN106164343B (fr)
DE (1) DE102014005444A1 (fr)
ES (1) ES2747966T3 (fr)
WO (1) WO2015154851A1 (fr)

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DE102016002852A1 (de) 2016-03-10 2017-09-14 Audi Ag Verfahren zur Passivierung einer Oberfläche eines Metallbauteils
DE102017107529A1 (de) * 2017-04-07 2018-10-11 Lisa Dräxlmaier GmbH Verfahren zur Korrosionsinhibierung von Metallen und Temperierungssystem für ein metallisches Werkzeug
CN107419257A (zh) * 2017-07-04 2017-12-01 安徽腾龙泵阀制造有限公司 一种镀锌钢板的表面钝化处理工艺
DE102017011379A1 (de) 2017-12-11 2019-06-13 Audi Ag Anti-Korrosionsbeschichtung für metallische Substrate
DE102021134434B4 (de) 2021-12-23 2023-08-03 Audi Aktiengesellschaft Prozessanordnung sowie Verfahren zur Behandlung eines Metallbauteils

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EP3129527A1 (fr) 2017-02-15
DE102014005444A1 (de) 2015-10-15
WO2015154851A1 (fr) 2015-10-15
US20170037517A1 (en) 2017-02-09
CN106164343B (zh) 2018-09-11
CN106164343A (zh) 2016-11-23
US10351959B2 (en) 2019-07-16
ES2747966T3 (es) 2020-03-12

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