EP3856947A1 - Procédé d'amélioration de l'aptitude à la phosphatation de surfaces métalliques pourvues d'un pré-traitement ou d'un post-traitement temporaire - Google Patents

Procédé d'amélioration de l'aptitude à la phosphatation de surfaces métalliques pourvues d'un pré-traitement ou d'un post-traitement temporaire

Info

Publication number
EP3856947A1
EP3856947A1 EP19778901.9A EP19778901A EP3856947A1 EP 3856947 A1 EP3856947 A1 EP 3856947A1 EP 19778901 A EP19778901 A EP 19778901A EP 3856947 A1 EP3856947 A1 EP 3856947A1
Authority
EP
European Patent Office
Prior art keywords
steel product
flat steel
coating
activation particles
zinc
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19778901.9A
Other languages
German (de)
English (en)
Inventor
Fabian JUNGE
Christian Altgassen
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.)
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Original Assignee
ThyssenKrupp Steel Europe AG
ThyssenKrupp AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel Europe AG, ThyssenKrupp AG filed Critical ThyssenKrupp Steel Europe AG
Publication of EP3856947A1 publication Critical patent/EP3856947A1/fr
Pending legal-status Critical Current

Links

Classifications

    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C22/18—Orthophosphates containing manganese cations
    • C23C22/182—Orthophosphates containing manganese cations containing also zinc cations
    • C23C22/184—Orthophosphates containing manganese cations containing also zinc cations containing also nickel 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
    • C23C22/73—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 characterised by the process
    • 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
    • C23C22/78—Pretreatment of the material to be coated
    • 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
    • C23C22/78—Pretreatment of the material to be coated
    • C23C22/80—Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/20—Use of solutions containing silanes

Definitions

  • the present invention relates to a method for producing a formed component, comprising at least the steps (A) providing a flat steel product, (B) skin-passaging the flat steel product from step (A), (C) applying a functional coating to the flat steel product from step (B), (D) reshaping the flat steel product from step (C) to obtain a reshaped component, (E) removing the functional coating from the reshaped component from step (D), (F) applying activation particles to the reshaped component from step (E), and (G) applying phosphating to the reshaped component from step (F), additional activation particles being present before and / or during step (B) and / or before and / or during step (C) the flat steel product can be applied. Furthermore, the present invention relates to a corresponding flat steel product and its use in the automotive sector.
  • EP 2 824 213 A1 describes a method for improving the adhesiveness on an anti-corrosive coated steel sheet.
  • an aqueous solution containing fluoride ions is applied to the ZnO and Al 2 0 3 oxide layer of the protective coating based on Zn-Al-Mg.
  • the fluoride ions ensure that the oxide layer is modified but tightly sealed, so that an adhesive that is subsequently applied shows better adhesion.
  • US 2015/0352825 A1 discloses a method in which a flat steel product which has an anticorrosive coating is first treated with an acidic solution, so that a subsequently applied adhesive shows better adhesion.
  • the anticorrosively coated steel flat products known from the prior art often have the problem that during their manufacture a temporary pre- or post-treatment, ie a functional coating such as an adhesion-promoting layer, a shaping aid, a passivation or a combination thereof, is applied and removed again must become. This removal is usually done by a cleaning step. It may happen that the cleaning step is not complete, ie that at least on some of the flat steel product residues of the functional coating remain.
  • a phosphate layer is formed which consists of areas of differently sized zinc phosphate crystals, which appear uneven in macroscopic observation, which is undesirable.
  • a method is to be provided according to the invention which also delivers good phosphated surfaces, in particular with improved adhesive adhesion, if functional coatings which have been applied in the meantime have not been completely removed.
  • step (G) applying phosphating to the formed component from step (F), additional activation particles being applied to the flat steel product before and / or during step (B) and / or before and / or during step (C).
  • Step (A) of the method according to the invention comprises providing a flat steel product.
  • a flat steel product provided with a protective coating against corrosion is preferably provided.
  • the flat steel product used according to the invention can consist of any steel grade known to the person skilled in the art, for example CR3 or DX51.
  • This steel preferably used according to the invention contains, for example, max. 0.08% by weight C, max. 0.45% by weight Mn, max. 0.030% by weight P, max. 0.030% by weight S, max. 0.15% by weight Cr, max. 0.20% by weight Cu, max. 0.06% by weight Mo, max. 0.008% by weight Nb, max. 0.20% by weight of Ni, the sum of Cu, Ni, Cr and Mo not exceeding 0.50% by weight and the sum of Cr and Mo not exceeding 0.16% by weight, the rest Fe and unavoidable impurities.
  • the flat steel product according to the invention is based on a steel sheet, preferably containing a coating that protects against corrosion.
  • the coating which is preferably present according to the invention and which protects against corrosion is preferably metallic.
  • the steel sheet can be coated in a known manner, for example using the hot-dip process (hot-dip galvanizing) or by electrolytic deposition. According to the invention, the coating is preferably carried out by the hot-dip method. Appropriate methods are known per se to the person skilled in the art.
  • the coating which is preferably present on the flat steel product according to the invention, is preferably based on zinc, a zinc alloy, made of aluminum or an aluminum alloy.
  • a non-coated, in particular non-galvanized, steel surface can also be used in step (A).
  • the cations migrate from the anode through the electrolyte to the steel strip surface and are cathodically deposited there.
  • the metal for example zinc
  • the anodes being made of correspondingly nobler materials.
  • the amount of metal deposited on the strip surface depends on the current density and the coating time. In order to achieve a metal layer thickness of a few micrometers at a belt speed of, for example, 100 m / min, the steel belt has to pass through several coating cells connected in series in an electrolyte cell because of the relatively short coating time at such a belt speed and thus a correspondingly low deposition rate.
  • the electrolytically coated steel strip is preferably passed through a multi-stage rinsing device.
  • the present coating particularly preferably consists of zinc or a zinc alloy, which has been applied more preferably by hot-dip coating.
  • Processes for hot-dip coating are known per se to the person skilled in the art.
  • the coating in particular made of zinc or a zinc alloy, is preferably in accordance with the invention with a coating weight of 1 to 600 g / m 2 , ie 0.5 to 300 g / m 2 per side, particularly preferably 20 to 300 g / m 2 , ie 10 to 150 g / m 2 per side.
  • the at least one skin-dressing agent is very particularly preferably selected from the group consisting of compositions with the brand names Friocut LF 280, Gardolube L 8256, QWERL 4305 and mixtures thereof.
  • the present invention therefore preferably relates to the method according to the invention, wherein at least one skin-pass agent and additional activation particles are applied to the flat steel product before and / or during step (B).
  • a mixture comprising at least one skin-dressing agent and additional activation particles is applied to the flat steel product before and / or during step (B).
  • at least one skin-pass agent and additional activation particles are applied to the flat steel product separately from one another before and / or during step (B).
  • the application of the at least one skin-pass agent and, if appropriate, the activation particles can generally be carried out by all methods known to the person skilled in the art, for example spraying, dipping or coating methods.
  • step (B) Corresponding additional activation particles which can be applied before and / or during step (B) are described in detail below.
  • Step (C) of the method according to the invention comprises the application of a functional coating to the flat steel product from step (B).
  • the steel product which is obtained after the skin pass in step (B), contains on the surface at least parts of the optionally applied skin pass agent and, if necessary, additional activation particles.
  • the at least one adhesion promoter is very particularly preferably selected from the group consisting of compositions with the trade names GBX 4537, Bonderite 1461 and mixtures thereof.
  • An adhesion-promoting layer can be applied to the flat steel product by all methods known to the person skilled in the art, for example spraying, dipping or coating methods.
  • An adhesion-promoting coating is generally applied in an amount sufficient to develop the adhesion-promoting effect, for example 1 mg / m 2 to 10 mg / m 2 , preferably 2 mg / m 2 to 6 mg / m 2 , each edition of the guide element silicon.
  • Suitable coatings which can act as shaping aids are known per se to the person skilled in the art and contain, for example, acids, for example phosphoric acid, bases, for example potassium hydroxide or organic amines, cyclic, organic compounds, for example benzotriazole, further organic compounds, for example fatty acids, sulfonates, for example methanesulfonate, or alcohols, for example aminoethanol, inorganic salts, for example sulfates, in particular zinc sulfate or potassium sulfate, or carbonates, for example sodium carbonate, preferably as aqueous solutions.
  • acids for example phosphoric acid
  • bases for example potassium hydroxide or organic amines
  • cyclic organic compounds
  • organic compounds for example benzotriazole
  • further organic compounds for example fatty acids, sulfonates, for example methanesulfonate, or alcohols, for example aminoethanol
  • inorganic salts for example sulfates, in particular zinc sulfate or
  • the at least one shaping aid is very particularly preferably selected from the group consisting of compositions with the trade names Lubitreat, NIT, L-FM50000, L-FM50100, L-FM50200 and mixtures thereof.
  • a coating which acts as a shaping aid can be applied to the flat steel product by all processes known to the person skilled in the art, for example spraying, dipping or coating processes.
  • a coating which acts as a shaping aid is generally applied in an amount which is sufficient to develop the corresponding action, for example 5 mg / m 2 to 40 mg / m 2 , preferably 10 mg / m 2 to 25 mg / m 2 , in each case Support for the guiding element sulfur.
  • Suitable passivating coatings are known per se to the person skilled in the art and contain, for example, chromium salts, for example chromium orthophosphate, chromium nitrate, chromium trifluoride, organic acids, for example citric acid, inorganic acids, for example hydrofluoric acid, and mixtures thereof.
  • the at least one passivating agent is very particularly preferably selected from the group consisting of compositions with the Flandels names Gardolene D 6804, Gardolen D 6811, Bonderite M-PA 6003 and mixtures thereof.
  • a passivating coating can be applied to the flat steel product by all methods known to the person skilled in the art, for example spraying, dipping or coating methods.
  • a passivating coating is generally applied in an amount sufficient to develop the passivating effect, for example 5 mg / m 2 to 40 mg / m 2 , preferably 10 mg / m 2 to 25 mg / m 2 , in each case overlay of the guide element chrome, for passivations containing chrome.
  • step (C) of the process according to the invention two or more of the coatings mentioned are applied in appropriate amounts. This can be done sequentially or simultaneously.
  • the present invention preferably relates to the method according to the invention, at least one functional coating agent and additional activation particles being applied before and / or during step (C).
  • a mixture comprising at least one functional coating agent and additional activating particles is applied to the flat steel product before and / or during step (C).
  • step (C) before and / or during step (C), at least one functional coating agent and additional activation particles are applied separately to the flat steel product.
  • the shaping of the flat steel product from step (C) can be carried out according to the invention by all processes known to the person skilled in the art, for example in accordance with DIN 8580 (2010) and in particular DIN 8584 (2010).
  • the forming preferably takes place at room temperature.
  • Step (E) of the method according to the invention comprises removing the functional coating from the formed component from step (D).
  • Step (E) of the method according to the invention preferably takes place in that the deformed component from step (D) can be treated with at least one cleaning agent in order to remove the functional coating.
  • the functional coating is removed in step (E) of the method according to the invention by treating the surface of the formed component with a cleaning agent.
  • the cleaning agent can be acidic, neutral or alkaline.
  • an alkaline cleaning agent is used.
  • the cleaning agent is more preferably used as an aqueous solution.
  • the cleaning-active substance for example a surfactant, is preferably present in an amount which appears to be suitable to the person skilled in the art.
  • Further components of the cleaning agent which are preferably present according to the invention are selected, for example, from the group consisting of sodium hydroxide or potassium hydroxide and mixtures thereof.
  • Step (E) of the method according to the invention can furthermore be carried out using mechanical energy, for example by brushing the surfaces to be cleaned or by applying water and / or cleaning agent to the surface under high pressure.
  • Step (E) of the process according to the invention is preferably carried out at a temperature of 30 to 70 ° C.
  • the method according to the invention therefore includes the feature essential to the invention that additional activation particles are applied to the flat steel product before and / or during step (B) and / or before and / or during step (C).
  • the additional activation particles can differ from the activation particles used in step (F). In another preferred according to the invention, the additional activation particles and the activation particles used in step (F) of the process according to the invention are the same.
  • the additional activation particles are preferably selected from the group consisting of powder activations, in particular based on titanium phosphates, or liquid activations, in particular based on zinc phosphates and metal oxides.
  • Compounds dispersible in water for example oxalates of silver or copper compounds, disodium phosphate in combination with titanium compounds, in particular with water-soluble titanium compounds, for example titanium phosphate or sodium titanyl phosphates, zinc phosphates and mixtures of zinc phosphates and metal oxides, for example, are preferred.
  • Zinc or iron oxides and mixtures thereof are used.
  • the additional activation particles are preferably applied in powder form or as an aqueous composition.
  • activation particles are applied in step (F) and before and / or during step (B) and / or before and / or during step (C) in order to improve the nucleation process of the later phosphating.
  • the additional application of crystallization nuclei increases the number of nucleation sites on the substrate, since the zinc phosphate precipitating from the phosphating solution preferentially crystallizes on the additional nuclei.
  • the number of phosphate crystals per unit area is increased so that the crystals hinder their growth. This leads to a reduction in crystal size and basis weight, while the rate of crystal formation increases and the degree of coverage increases.
  • the phosphate layer is formed more evenly and the consumption of chemicals can be reduced.
  • the crystals become mechanically more stable and the adhesion of the crystals to the substrate is improved.
  • the formation of the smaller, evenly distributed phosphate crystals leads to an improvement in the adhesion of the paint film applied in the later process.
  • the height- The degree of coverage leads to a lower porosity, which in turn leads to an increased corrosion resistance.
  • the phosphating process can thus be specifically set and controlled.
  • the actual activation step is generally preceded by a separate cleaning step in which the surface is first freed of electrolyte, oils, fats, solid particles, oxides and other impurities with an alkaline or acidic cleaner.
  • the pH range can be 6 to 13.
  • the surface is then rinsed with fresh water and deionized water in order to avoid carryover into the subsequent activation bath.
  • the additional activation particles which are applied in step (F) of the method according to the invention are preferred, selected from the group consisting of powder activations, in particular based on titanium phosphates, or liquid activations, in particular based on zinc phosphates and metal oxides.
  • Compounds which are dispersible in water for example oxalates of silver or copper compounds, disodium phosphate in combination with titanium compounds, in particular with water-soluble titanium compounds, for example titanium phosphate or sodium titanyl phosphates, zinc phosphates and mixtures of zinc phosphates and metal oxides, for example are preferred.
  • Zinc or iron oxides and mixtures thereof are used.
  • the additional activation particles are preferably applied in powder form.
  • the starting concentration of the activating agent is, for example, 0.1 to 20 g Aftertreatment) particularly preferred with 1 blS 6 g activating agent concentrate / l preliminary or Aftercare -
  • Step (G) of the method according to the invention comprises the application of phosphating to the formed component from step (F).
  • an aqueous solution containing zinc phosphate, phosphoric acid, optionally nickel and / or manganese cations and an accelerator are preferably used.
  • an accelerator according to the invention for example, nitrate, for example as zinc nitrate, nitrite, for example as sodium nitrite or hydrogen peroxide, is used.
  • the process steps are preferably carried out in the sequence (A), (B), (C), (D), (E) and (F).
  • the method according to the invention can optionally have further steps, for example oiling and / or gluing, which then take place between the said steps.
  • steps (C), (F) and / or (G) are preferably carried out in each case by an injection, immersion or coating process.
  • the application of solutions in steps (B), (C), (F), (G) of the method according to the invention, in particular the application of the additional activation particles before and / or during step (B) and / or before and / or step (C) is preferably carried out in a coating process.
  • Coating processes are known per se to the person skilled in the art.
  • the temperature of the, in particular aqueous, solution is preferably 15 to 30 ° C.
  • a wet film with a thickness of 1 to 4 ⁇ m, corresponding to 1 to 4 ml / m 2 is preferably applied. After the wet film has been applied, the coated board is preferably dried.
  • the temperature of the dryer is set so that a suitable temperature is set in relation to the belt speed, for example 60 to 130 ° C.
  • the belt speed is, for example, 30 to 180 m / min, preferably 80 and 120 m / min, for example 100 m / min.
  • FIG. 1 shows a coating obtained after comparative experiment V5.
  • FIG. 2 shows a coating obtained according to experiment 6 according to the invention.
  • the aqueous solutions are applied at a temperature of 15 to 30 ° C., the wet film thickness of the applied solution is in each case 1 to 4 pm, corresponding to 1 to 4 ml / m 2 .
  • the coated tape is dried at a temperature of 60 to 130 ° C.
  • the belt speed during the process is 100 m / min 1 .
  • the boards treated in this way are then phosphated after application of activation particles.
  • the phosphated top and bottom sides are examined by SEM or EDX analysis. The results are shown in Table 1.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

La présente invention concerne un procédé de production d'une pièce structurale façonnée, comprenant au moins les étapes suivantes : (A) fournir un produit plat en acier, (B) dresser le produit plat en acier obtenu à l'étape (A), (C) appliquer un revêtement fonctionnel sur le produit plat en acier obtenu à l'étape (B), (D) façonner le produit plat en acier obtenu à l'étape (C) pour obtenir une pièce structurale façonnée, (E) éliminer le revêtement fonctionnel de la pièce structurale façonnée obtenue à l'étape (D), (F) appliquer des particules d'activation sur la pièce structurale façonnée obtenue à l'étape (E), et (G) appliquer une phosphatation sur la pièce structurale façonnée obtenue à l'étape (F), des particules d'activation supplémentaires étant appliquées sur le produit plat en acier avant et/ou pendant l'étape B, et/ou avant et/ou pendant l'étape (C).
EP19778901.9A 2018-09-24 2019-09-20 Procédé d'amélioration de l'aptitude à la phosphatation de surfaces métalliques pourvues d'un pré-traitement ou d'un post-traitement temporaire Pending EP3856947A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018216216.6A DE102018216216A1 (de) 2018-09-24 2018-09-24 Verfahren zur Verbesserung der Phosphatierbarkeit von metallischen Oberflächen, welche mit einer temporären Vor- bzw. Nachbehandlung versehen werden
PCT/EP2019/075340 WO2020064548A1 (fr) 2018-09-24 2019-09-20 Procédé d'amélioration de l'aptitude à la phosphatation de surfaces métalliques pourvues d'un pré-traitement ou d'un post-traitement temporaire

Publications (1)

Publication Number Publication Date
EP3856947A1 true EP3856947A1 (fr) 2021-08-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19778901.9A Pending EP3856947A1 (fr) 2018-09-24 2019-09-20 Procédé d'amélioration de l'aptitude à la phosphatation de surfaces métalliques pourvues d'un pré-traitement ou d'un post-traitement temporaire

Country Status (3)

Country Link
EP (1) EP3856947A1 (fr)
DE (1) DE102018216216A1 (fr)
WO (1) WO2020064548A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE4012795A1 (de) * 1990-04-21 1991-10-24 Metallgesellschaft Ag Aktivierungsmittel fuer die phosphatierung
JP3857866B2 (ja) * 2000-02-29 2006-12-13 日本ペイント株式会社 ノンクロメート金属表面処理剤、表面処理方法および処理された塗装鋼材
DE10110833B4 (de) * 2001-03-06 2005-03-24 Chemetall Gmbh Verfahren zum Aufbringen eines Phosphatüberzuges und Verwendung der derart phosphatierten Metallteile
EP1350865A3 (fr) * 2002-04-05 2004-12-29 ThyssenKrupp Stahl AG Tôle en acier zingué et phosphaté et procédé de fabrication
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WO2013160568A1 (fr) 2012-04-25 2013-10-31 Arcelormittal Investigacion Y Desarrollo, S.L. Procédé de réalisation d'une tôle à revêtements ZnAlMg comprenant l'application d'une solution acide et tôle correspondante.
EP2824213A1 (fr) 2013-07-12 2015-01-14 Voestalpine Stahl GmbH Procédé d'amélioration de l'adhérence sur une tôle d'acier dotée d'un revêtement de protection
ES2734456T3 (es) 2013-09-19 2019-12-10 Fuchs Petrolub Se Capa funcional inorgánica sobre acero galvanizado por inmersión en caliente como ayuda para la conformación
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EP2937411A1 (fr) 2014-04-25 2015-10-28 Voestalpine Stahl GmbH Tôle et procédé destiné à l'amélioration de la déformabilité d'une tôle
WO2017125131A1 (fr) * 2016-01-19 2017-07-27 Thyssenkrupp Steel Europe Ag Procédé de fabrication d'un produit en acier doté d'un revêtement de zinc et d'une couche active tribilogiquement appliquée sur celui-ci ainsi que produit en acier obtenu de maniere correspondante

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