WO2021165088A1 - Procédé de fabrication d'une tôle d'acier traitée en surface, et tôle d'acier traitée en surface - Google Patents

Procédé de fabrication d'une tôle d'acier traitée en surface, et tôle d'acier traitée en surface Download PDF

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Publication number
WO2021165088A1
WO2021165088A1 PCT/EP2021/053004 EP2021053004W WO2021165088A1 WO 2021165088 A1 WO2021165088 A1 WO 2021165088A1 EP 2021053004 W EP2021053004 W EP 2021053004W WO 2021165088 A1 WO2021165088 A1 WO 2021165088A1
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WO
WIPO (PCT)
Prior art keywords
oxide layer
steel sheet
protective coating
heat treatment
native oxide
Prior art date
Application number
PCT/EP2021/053004
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German (de)
English (en)
Inventor
Fabian JUNGE
Jennifer Schulz
Burak William Cetinkaya
Original Assignee
Thyssenkrupp Steel Europe Ag
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Filing date
Publication date
Application filed by Thyssenkrupp Steel Europe Ag filed Critical Thyssenkrupp Steel Europe Ag
Priority to EP21705120.0A priority Critical patent/EP4107297A1/fr
Publication of WO2021165088A1 publication Critical patent/WO2021165088A1/fr

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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
    • C23C2/04—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
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C18/00—Alloys based on zinc
    • C22C18/04—Alloys based on zinc with aluminium as the next major constituent
    • 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
    • C23C2/12—Aluminium 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
    • 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
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • 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
    • C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
    • C23C2/36—Elongated material
    • C23C2/40—Plates; Strips

Definitions

  • the invention relates to a method for improving the wettability on a surface-finished steel sheet, in which a protective coating based on Zn-Al-Mg is applied, with a native oxide layer comprising at least ZnO, Al 2 O 3 and MgO forming after application of the protective coating and that the steel sheet having native oxide layer is subjected to at least one further treatment in order to change the native oxide layer.
  • the invention also relates to a correspondingly produced, surface-finished steel sheet.
  • An addition of different alloying elements leads to the formation of an oxide layer on the surface-finished steel sheet with different chemical compositions and properties, especially when hot-dip coating or when hot-dip finishing of a steel sheet.
  • a temperature-related "native" oxide layer forms on the coating.
  • this oxide layer can have a negative effect on the further process steps in the automotive process, such as suitability for bonding, cleaning or phosphating, in the case of Zn-Al-Mg basic protective coatings.
  • a Zn-Al-Mg base surface must be very easy to wet with aqueous media in order to be able to degrease, activate and phosphate it well.
  • the steel sheet having a native oxide layer must be subjected to at least one further treatment in order to change the native oxide layer, in particular to cover the native oxide layer or at least partially to be removed, see for example WO 2015/004284 A1, WO 2013/160871 A1.
  • the object of the invention is to provide a method for producing a surface-finished steel sheet, with which improved wettability can be achieved without the costly use of chemicals, and to provide a correspondingly surface-finished steel sheet.
  • the object is achieved in relation to the method with the features of claim 1 and in relation to the surface-finished steel sheet with the features of claim 11.
  • the at least one further treatment comprises at least one heat treatment at a temperature for a duration in a non-reducing atmosphere, the non-reducing atmosphere containing the The temperature and the duration of the heat treatment are coordinated with one another in such a way that the native oxide layer is post-oxidized, in particular the post-oxidized oxide layer formed therefrom being larger than the native oxide layer.
  • the post-oxidized oxide layer is, for example, at least 20%, in particular by at least 50%, preferably by at least 80%, preferably by 150%, particularly preferably by 200% larger than the native oxide layer.
  • the "targeted" post-oxidation of the native oxide layer on the Zn-Al-Mg base protective coating of the surface-refined steel sheet results in a change in the chemical composition on the surface, which has a positive effect on the chemical reactivity on the entire surface of the sheet .
  • the areas close to the surface are oxidized, which manifests itself in the formation of rounded oxide structures, initially as bubble-like structures, then as spherical structures. This increases the surface area, which in turn leads to improved wettability and / or deformability.
  • Sheet steel is to be understood as meaning a flat steel product in the form of a strip or sheet metal / plate. It has a longitudinal extension (length), a transverse extension (width) and a vertical extension (thickness).
  • the steel sheet can be a hot strip (hot-rolled steel strip) or cold strip (cold-rolled steel strip) or be made from a hot strip or from a cold strip.
  • the thickness of the steel sheet is, for example, 0.5 to 4.0 mm, in particular 0.6 to 3.0 mm, preferably 0.7 to 2.5 mm.
  • the heat treatment is carried out at a temperature between at least 400 ° C. and at most Acl.
  • the temperature is limited to a maximum of Acl, which can be determined depending on the chemical composition of the steel sheet or derived from ZTU / ZTA diagrams.
  • the temperature is in particular limited to a maximum of 700.degree. C., preferably to a maximum of 650.degree. C., preferably to a maximum of 600.degree. C., particularly preferably to a maximum of 560.degree.
  • the temperature is at least 400 ° C., in particular at least 420 ° C., preferably at least 440 ° C., in order to be able to achieve a sufficiently strong oxidation in the shortest possible time, and / or that the phases of the protective coating are predominantly in one are in a liquid state and can thus preferentially oxidize.
  • the heat treatment is carried out for a duration between at least 3 s and a maximum of 24 hours.
  • the duration or the dwell time of the surface-refined steel sheet can vary.
  • the duration according to the invention can be between 3 s and 60 s, in particular between 4 s and 30 s, preferably between 5 s and 15 s.
  • the duration can alternatively be between 60 s and 24 h, in particular between 2 min and 12 h, preferably between 10 min and 2 h.
  • an 0 2 -containing atmosphere is used as the non-reducing atmosphere.
  • O 2 -containing gases can support post-oxidation of the native oxide layer.
  • Air as a cost-neutral or free and freely available gas, can be used with particular preference.
  • the protective coating based on Zn-Al-Mg has the following chemical composition in% by weight:
  • the protective coating contains both aluminum with a content of at least 0.1% by weight up to 5.0% by weight and magnesium with a content of at least 0.1% by weight up to Contain 5.0% by weight.
  • Steel sheets with a zinc-based protective coating have very good cathodic corrosion protection, which has been used in automotive engineering for years. If improved corrosion protection is provided, the protective coating preferably has aluminum and magnesium, each with at least 0.5% by weight.
  • the protective coating has a thickness between 2 and 20 ⁇ m, in particular between 4 and 15 ⁇ m, preferably between 5 and 12 ⁇ m.
  • the native oxide layer has a thickness between 1 and 100 nm, in particular between 2 and 60 nm, preferably between 3 and 50 nm.
  • the surface-finished steel sheet is dressed. Passing can be carried out before or after the post-oxidation heat treatment. Skin-passaging is preferably carried out after heat treatment, since after skin-passaging the surface-refined steel sheet does not undergo any further heat treatment and therefore no longer adversely affects the properties set in or on the surface-refined steel sheet, such as mechanical parameters and / or surface roughness, that are set by skin-passaging will.
  • the skin pass properties are specifically set, these from the chemical composition of the steel sheet and the skin pass, which is at least 0.2% and for example up to 5%, in particular up to up to 4%, preferably up to 3%, preferably up to 2.5%, particularly preferably up to 2%, be dependent.
  • the skin pass degree expresses the ratio of the decrease in thickness (input thickness minus output thickness in the rolling / skin pass stand) of the rolled or passaged steel sheet to the input thickness, in particular taking the reduction in thickness into account.
  • a deterministic surface structure can be introduced into the surface-refined steel sheet through the treatment.
  • a deterministic surface structure is to be understood in particular as regularly recurring surface structures which have a defined shape and / or configuration or dimensioning. In particular, this also includes surface structures with a (guasi-) stochastic appearance, which are composed of stochastic form elements with a recurring structure.
  • the introduction of a stochastic surface structure into the surface-finished steel sheet is also conceivable.
  • the surface-finished steel sheet is pickled.
  • inorganic impurities on the surface of the protective coating can be removed with the aid of a liquid by pickling if necessary, whereby chemical dissolution and / or detachment, in particular of all oxidic layers, can be effected from the surface of the protective coating.
  • Pickling is usually done by flooding, immersion or spraying. Electrolytic methods can also be used to speed up the process.
  • the pickling liquids are usually dilute mineral acids, which can contain additives, for example to achieve a uniform pickling attack on the surface.
  • the surface-finished steel sheet can preferably be phosphated.
  • improved phosphatability can thus also be achieved.
  • the zinc ions can get better into the phosphating bath and form a conversion chemistry, so that the phosphate layer can be formed essentially homogeneously, which can meet the high requirements of the automobile manufacturer.
  • the surface-finished steel sheet can be better wetted with aqueous solutions (cleaner, activating solution, phosphating solution).
  • aqueous solutions cleaning, activating solution, phosphating solution.
  • the second teaching of the invention relates to a surface-finished steel sheet with a protective coating based on Zn-Al-Mg and an oxide layer comprising at least ZnO, Al 2 0 3 and MgO, which has preferably been produced by the method according to the invention, the surface-finished steel sheet has a surface energy of at least 40 mN / m and a polar component of the surface energy of at least 20%.
  • the wettability can be improved, which can be determined according to a test method for determining the surface energy by means of static contact angle measurement according to DIN 55660-2: 2011-12.
  • the measurements can be carried out, for example, with the static contact angle measuring device DSA 100 from Kruess.
  • the surface energy can be determined, preferably using the Young's equation, and the polar and disperse portion of the surface energy can be calculated.
  • the contact angle for ethylene glycol, diiodomethane and water is particularly preferably determined.
  • the surface energy can in particular be at least 45 mN / m, preferably at least 48 mN / m, preferably at least 51 mN / m.
  • the polar component of the surface energy can in particular be at least 30%, preferably at least 40%, preferably at least 50%.
  • the near-surface chemical composition is determined, for example, by means of X-ray photoelectron spectroscopy (XPS), the procedure for determining the individual chemical compositions being familiar from the prior art.
  • the measurement can be carried out, for example, with the Phi Quantera II SXM Scanning XPS Microprobe from Physical Electronics GmbH.
  • the element concentrations measured by means of the XPS can be taken from overview spectra, which can be recorded for example with a transmission energy of 280 eV in the course of at least 7 cycles and can relate, for example, to a measuring area of 100 x 100 pm 2 .
  • the determined proportions of Zn, Mg and Al are normalized to 100% by weight in the oxide layer and the normalized Mg proportion in the oxide layer is at least 30% by weight.
  • the relative concentration of zinc, magnesium and aluminum is determined by determining the absolute concentration of these elements and then normalizing to 100%.
  • the sum of the concentration of zinc, magnesium and aluminum is set equal to 100 and the proportion of the respective element in this 100% is evaluated or weighted as a relative concentration, i.e. based on 100%.
  • the relative concentration of an element (Al, Mg, Zn) therefore relates to the sum of the concentrations of the elements Mg, Zn and Al, in that this sum represents 100%.
  • the absolute concentration of the elements Zn, Mg and Al can vary from protective coating to protective coating, the information for the general method to be used is given as a relative concentration and in percentage points in order to precisely define changes.
  • the occurrence of the elements zinc, magnesium and aluminum is recorded regardless of the form in which they are present. It is therefore irrelevant whether these elements are present as neutral atoms or as ions, in a compound such as an alloy or intermetallic phases, or in a compound such as complexes, oxides, salts, hydroxides or the like.
  • the terms “zinc”, “aluminum” and “magnesium” in the context of the invention can encompass not only the elements in pure form, but also oxidic and / or hydroxidic or any form of compounds that contain these elements.
  • the normalized Mg content in the oxide layer is in particular at least 33% by weight, preferably at least 36% by weight, preferably at least 40% by weight.
  • the specification of the normalized portion corresponds in particular to the determined mean value, with fluctuations within the scope of measurement tolerances (standard deviation).
  • the steel sheet consists of a steel material with the following chemical composition in% by weight:
  • N up to 0.1, in particular up to 0.01, and optionally one or more alloy elements from the group (Al, Cr, Cu, Nb, Mo, Ti, V, Ni, B, Sn, Ca):
  • AI up to 0.2, in particular between 0.001 and 0.1
  • Nb up to 0.1, in particular up to 0.05
  • V up to 0.2, in particular up to 0.1
  • Ni up to 0.2, in particular up to 0.18,
  • the drawing shows in the single FIG. 1 a cross-sectional view in the form of a light microscope recording of a surface-finished steel sheet (10) produced according to the invention.
  • the surface-finished steel sheet (10) comprises a steel sheet (1) with a protective coating (2) based on Zn-Al-Mg and an oxide layer (3) containing at least ZnO, Al2O3 and MgO.
  • the protective coating (2) contains Al between 0.1 and 5.0% by weight and Mg between 0.1 and 5.0% by weight.
  • the thickness of the steel sheet (1) is, for example, 0.5 to 4.0 mm.
  • the surface-finished steel sheet with the native oxide layer is subjected to at least one further treatment in order to change the native oxide layer.
  • the method according to the invention therefore provides that the at least one further treatment comprises at least one heat treatment at a temperature for a duration in a non-reducing atmosphere, the non-reducing atom sphere, the temperature and the duration of the heat treatment being coordinated with one another in such a way that that the native oxide layer is post-oxidized, in particular the post-oxidized oxide layer (3) resulting therefrom being larger than the native oxide layer.
  • the heat treatment is carried out at a temperature between at least 400 ° C. and a maximum of Acl, for a duration between at least 3 s and a maximum of 24 h, in an O 2 -containing atmosphere, preferably in air.
  • the surface-finished steel sheet (10) After the heat treatment for post-oxidation, the surface-finished steel sheet (10) has a surface energy of at least 40 mN / m and a polar component of the surface energy of at least 20%.
  • the proportions of Zn, Mg and Al are normalized to 100% in the oxide layer (3) and the normalized Mg proportion in the oxide layer (3) is at least 30%.
  • a steel strip (cold strip) of the quality DP500 was provided with a thickness of 0.7 mm and coated with a protective coating based on Zn-Al-Mg in a hot-dip coating system.
  • the melt contained 1.6% by weight of Al, 1.1% by weight of Mg, the remainder being Zn and unavoidable impurities.
  • the protective coating was set with a thickness of approx. 7 ⁇ m.
  • a native oxide layer comprising at least ZnO, Al 2 O 3 and MgO formed on the protective coating.
  • a total of 37 samples were separated from the surface-refined steel strip or sheet steel, which were then fed into further processing steps. The individual processing steps and the results obtained from them are summarized in Table 1.
  • Sample 0 reflects the reference sample, which was not subjected to a heat treatment, but was skinned after coating with a skin-pass degree of 0.8%.
  • Samples 1 to 36 were each subjected to a heat treatment which was carried out at different temperatures and durations. In the case of samples 1 to 36, the heat treatment was also carried out in different ovens, with air being used as the atmosphere in the oven in all cases. Passed samples were passaged with a skin pass degree of 0.8%. In the case of samples that were pickled, the pickling took place before the heat treatment in an acidic immersion bath with phosphoric acid, 5 ml / l, for approx. 30 s and an immersion bath temperature of approx. 25 ° C.
  • the heat treatment increases the thickness of the post-oxidized oxide layer and is at least 20% larger than the native oxide layer.
  • the normalized Mg proportions also change in the oxide layer or on the surface and increase with increasing duration, in particular at the expense of or through a reduction in the normalized Al proportions.
  • the near-surface chemical composition is determined by means of X-ray photoelectron spectroscopy (XPS).
  • XPS X-ray photoelectron spectroscopy
  • the Phi Quantera II SXM Scanning XPS Mini was used for the measurement. croprobe from Physical Electronics GmbH was used, whereby the element concentrations measured by means of the XPS were taken from overview spectra, which were recorded at a permeability of 280 eV in the course of at least 7 cycles and were based on a measuring area of 100xlOOpm 2 .
  • the surface energy essentially corresponds to the sum of the polar and disper sen components of the surface energy. If the polar portion corresponds to at least 20% of the surface energy, an improved wetting behavior can already result.
  • a corresponding surface energy which is at least 40 mN / m, in particular at least 45 mN / m, preferably at least 48 mN / m, preferably at least 51 mN / m and where the polar portion of the surface energy is in particular at least 30%, preferably wise is at least 40%, preferably at least 50%, surface-refined sheet steel with improved wettability can be provided.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

L'invention concerne un procédé pour améliorer la mouillabilité d'une tôle d'acier traitée en surface (10), dans lequel un revêtement protecteur (2) à base de Zn-Al-Mg est appliqué, une couche d'oxyde natif comprenant au moins ZnO, Al2O3 et MgO étant formée après l'application du revêtement protecteur et la tôle d'acier comprenant la couche d'oxyde natif étant soumise à au moins un traitement supplémentaire, de manière à modifier la couche d'oxyde natif, le ou les traitements supplémentaires comprenant au moins un traitement thermique à une température donnée pendant une certaine période dans une atmosphère non réductrice, l'atmosphère non réductrice, la température et la durée du traitement thermique étant harmonisées l'une avec l'autre de telle manière que la couche d'oxyde natif subit une post-oxydation, la couche d'oxyde post-oxydée (3) résultante étant notamment supérieure à la couche d'oxyde natif.
PCT/EP2021/053004 2020-02-20 2021-02-09 Procédé de fabrication d'une tôle d'acier traitée en surface, et tôle d'acier traitée en surface WO2021165088A1 (fr)

Priority Applications (1)

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EP21705120.0A EP4107297A1 (fr) 2020-02-20 2021-02-09 Procédé de fabrication d'une tôle d'acier traitée en surface, et tôle d'acier traitée en surface

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DE102020202171.6A DE102020202171A1 (de) 2020-02-20 2020-02-20 Verfahren zur Herstellung eines oberflächenveredelten Stahlblechs und oberflächenveredeltes Stahlblech
DE102020202171.6 2020-02-20

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Cited By (1)

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Publication number Priority date Publication date Assignee Title
EP4357472A1 (fr) * 2022-10-19 2024-04-24 ThyssenKrupp Steel Europe AG Tôles d'acier revêtues à chaud et laminées au dressage avec une couche d'oxyde intacte sur le revêtement métallique

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DE102021125889A1 (de) * 2021-10-06 2023-04-06 Thyssenkrupp Steel Europe Ag Verfahren zum Dressieren eines Stahlblechs, dressiertes Stahlblech und daraus hergestelltes Bauteil

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WO2013160871A1 (fr) 2012-04-25 2013-10-31 Arcelormittal Investigacion Y Desarrollo, S.L. Procédé de réalisation d'une tôle à revêtements znalmg huilés et tôle correspondante.
WO2015004284A1 (fr) 2013-07-12 2015-01-15 Voestalpine Stahl Gmbh Procédé permettant d'améliorer l'adhérence
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KR100678406B1 (ko) 2001-10-23 2007-02-02 수미도모 메탈 인더스트리즈, 리미티드 강철재의 열간 프레스 성형방법
AT412878B (de) 2003-07-29 2005-08-25 Voestalpine Stahl Gmbh Korrosionsgeschütztes stahlblechteil mit hoher festigkeit
MX2019011429A (es) 2017-03-31 2019-11-01 Nippon Steel Corp Lamina de acero con tratamiento superficial.

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EP4357472A1 (fr) * 2022-10-19 2024-04-24 ThyssenKrupp Steel Europe AG Tôles d'acier revêtues à chaud et laminées au dressage avec une couche d'oxyde intacte sur le revêtement métallique

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