US20180223409A1 - Steel Sheet Coated with a Metallic Coating based on Aluminum - Google Patents

Steel Sheet Coated with a Metallic Coating based on Aluminum Download PDF

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Publication number
US20180223409A1
US20180223409A1 US15/748,033 US201615748033A US2018223409A1 US 20180223409 A1 US20180223409 A1 US 20180223409A1 US 201615748033 A US201615748033 A US 201615748033A US 2018223409 A1 US2018223409 A1 US 2018223409A1
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United States
Prior art keywords
steel sheet
sheet according
weight
coating comprises
metallic coating
Prior art date
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Abandoned
Application number
US15/748,033
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English (en)
Inventor
Christian Allely
Tiago Machado Amorim
Joost DE STRYCKER
Krista Godelieve Oscar Van Den Bergh
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.)
ArcelorMittal SA
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ArcelorMittal SA
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Filing date
Publication date
Application filed by ArcelorMittal SA filed Critical ArcelorMittal SA
Assigned to ARCELORMITTAL reassignment ARCELORMITTAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALLELY, CHRISTIAN, MACHADO AMORIM, Tiago, DE STRYCKER, Joost, VAN DEN BERGH, Krista Godelieve Oscar
Publication of US20180223409A1 publication Critical patent/US20180223409A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/012—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of aluminium or an aluminium alloy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
    • B32B15/013—Layered products comprising a layer of metal all layers being exclusively metallic one layer being formed of an iron alloy or steel, another layer being formed of a metal other than iron or aluminium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/043—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • 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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
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    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
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    • C22C21/02—Alloys based on aluminium with silicon as the next major constituent
    • C22C21/04—Modified aluminium-silicon alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
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    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
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    • C22C21/10—Alloys based on aluminium with zinc as the next major constituent
    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
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    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/14—Alloys based on aluminium with copper as the next major constituent with silicon
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    • C22C—ALLOYS
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    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/16—Alloys based on aluminium with copper as the next major constituent with magnesium
    • C—CHEMISTRY; METALLURGY
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    • C22C—ALLOYS
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    • C22C21/12—Alloys based on aluminium with copper as the next major constituent
    • C22C21/18—Alloys based on aluminium with copper as the next major constituent with zinc
    • C—CHEMISTRY; METALLURGY
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    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching
    • 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
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    • C23C2/026—Deposition of sublayers, e.g. adhesion layers or pre-applied alloying elements or corrosion protection
    • 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
    • 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
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    • 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
    • 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
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    • C—CHEMISTRY; METALLURGY
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    • 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
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    • C—CHEMISTRY; METALLURGY
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Definitions

  • the present invention relates to a steel sheet coated with a metallic coating.
  • the invention is particularly well suited for the manufacture of automotive vehicles.
  • Zinc-based coatings are generally used because they allows for a protection against corrosion thanks to barrier protection and cathodic protection.
  • the barrier effect is obtained by the application of a metallic coating on steel surface.
  • metallic coatings prevent the contact between steel and corrosive atmosphere.
  • the barrier effect is independent from the nature of coating and substrate.
  • sacrificial cathodic protection is based on the fact that zinc is a metal less noble that steel. Thus, if corrosion occurs, zinc is consumed preferentially to steel. Cathodic protection is essential in areas where steel is directly exposed to corrosive atmosphere, like cut edges where surrounding zinc will be consumed before steel.
  • the coating comprises, in terms of weight %, Al: at least 45% and no greater than 70%, Mg: at least 1% and less than 5%, Si: at least 0.5% and less than 3%, with the remainder Zn and unavoidable impurities, wherein the Al/Zn ratio is 0.89-2.75 and the plating layer contains a scaly Mg 2 Si phase.
  • Mg 2 Si phases scaly or bulky
  • Mg 2 Si phases are complex. Indeed, it depends on the size and on the ratio of the short diameter mean size with respect to the long diameter of Mg 2 Si phases, as observed with a 5° polished cross-section. The size is affected most predominantly by the cooling rate after hot-dip plating.
  • the fabrication of Mg 2 Si phases also depends on the quantity of Mg and Si.
  • Mg 2 Si phases can be difficult to obtain because of these specifics criteria. Therefore, there is a risk that the desired Mg 2 Si phase is not obtained.
  • the purpose of the invention is to provide a coated steel sheet easy to form having a reinforced protection against corrosion, i.e. a sacrificial cathodic protection in addition to barrier protection, before and after the forming.
  • electrochemical potential has to be at least 50 mV more negative than the potential of steel, i.e. a maximum potential of ⁇ 0.78V with respect to a saturated calomel electrode (SCE). It is preferable not to decrease the potential at a value of ⁇ 1.4V/SCE, even ⁇ 1.25V/SCE which would involve a fast consumption and would finally decrease the period of protection of steel.
  • a steel sheet coated with a metallic coating comprising from 2.0 to 24.0% by weight of zinc, from 7.1 to 12.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and optionally unavoidable impurities and residuals elements, wherein the ratio Al/Zn is above 2.9.
  • the invention also provides parts made from the steel sheet coated with the metallic.
  • the invention further provides a coated part for the manufacture of an automotive.
  • FIG. 1 illustrates one corrosion cycle corresponding to 168 hours of the norm VDA 233-102.
  • any steel can be advantageously used in the scope of the invention.
  • steel having high mechanical strength is needed, in particular for parts of structure of automotive vehicle, steel having a tensile resistance superior to 500 MPa, advantageously between 500 and 2000 MPa before or after heat-treatment, can be used.
  • the weight composition of steel sheet is preferably as follows: 0.03% ⁇ C ⁇ 0.50%; 0.3% ⁇ Mn ⁇ 3.0%; 0.05% ⁇ Si ⁇ 0.8%; 0.015% ⁇ Ti ⁇ 0.2%; 0.005% ⁇ Al ⁇ 0.1%; 0% ⁇ Cr ⁇ 2.50%; 0% ⁇ S ⁇ 0.05%; 0% ⁇ P ⁇ 0.1%; 0% ⁇ B ⁇ 0.010%; 0% ⁇ Ni ⁇ 2.5%; 0% ⁇ Mo ⁇ 0.7%; 0% ⁇ Nb ⁇ 0.15%; 0% ⁇ N ⁇ 0.015%; 0% ⁇ Cu ⁇ 0.15%; 0% ⁇ Ca ⁇ 0.01%; 0% ⁇ W ⁇ 0.35%, the balance being iron and unavoidable impurities from the manufacture of steel.
  • the steel sheet is 22MnB5 with the following composition: 0.20% ⁇ C ⁇ 0.25%; 0.15% ⁇ Si ⁇ 0.35%; 1.10% ⁇ Mn ⁇ 1.40%; 0% ⁇ Cr ⁇ 0.30%; 0% ⁇ Mo ⁇ 0.35%; 0% ⁇ P ⁇ 0.025%; 0% ⁇ S ⁇ 0.005%; 0.020% ⁇ Ti ⁇ 0.060%; 0.020% ⁇ Al ⁇ 0.060%; 0.002% ⁇ B ⁇ 0.004%, the balance being iron and unavoidable impurities from the manufacture of steel.
  • the steel sheet can be Usibor®2000 with the following composition: 0.24% ⁇ C ⁇ 0.38%; 0.40% ⁇ Mn ⁇ 3%; 0.10% ⁇ Si ⁇ 0.70%; 0.015% ⁇ Al ⁇ 0.070%; 0% ⁇ Cr ⁇ 2%; 0.25% ⁇ Ni ⁇ 2%; 0.020% ⁇ Ti ⁇ 0.10%; 0% ⁇ Nb ⁇ 0.060%; 0.0005% ⁇ B ⁇ 0.0040%; 0.003% ⁇ N ⁇ 0.010%; 0.0001% ⁇ S ⁇ 0.005%; 0.0001% ⁇ P ⁇ 0.025%; it being understood that the contents of titanium and nitrogen satisfy Ti/N>3.42; and that the contents of carbon, manganese, chromium and silicon satisfy:
  • the composition optionally comprising one or more of the following: 0.05% ⁇ Mo ⁇ 0.65%; 0.001% ⁇ W ⁇ 0.30%; 0.0005% ⁇ Ca ⁇ 0.005%, the balance being iron and unavoidable impurities from the manufacture of steel.
  • the steel sheet is Ductibor®500 with the following composition: 0.040% ⁇ C ⁇ 0.100%; 0.80% ⁇ Mn ⁇ 2.00%; 0% ⁇ Si ⁇ 0.30%; 0% ⁇ S ⁇ 0.005%; 0% ⁇ P ⁇ 0.030%; 0.010% ⁇ Al ⁇ 0.070%; 0.015% ⁇ Nb ⁇ 0.100%; 0.030% ⁇ Ti ⁇ 0.080%; 0% ⁇ N ⁇ 0.009%; 0% ⁇ Cu ⁇ 0.100%; 0% ⁇ Ni ⁇ 0.100%; 0% ⁇ Cr ⁇ 0.100%; 0% ⁇ Mo ⁇ 0.100%; 0% ⁇ Ca ⁇ 0.006%, the balance being iron and unavoidable impurities from the manufacture of steel.
  • Steel sheet can be obtained by hot rolling and optionally cold rolling depending on the desired thickness, which can be for example between 0.7 and 3.0 mm.
  • the invention provides a steel sheet coated with a metallic coating comprising from 2.0 to 24.0% by weight of zinc, from 7.1 to 12.0% by weight of silicon, optionally from 1.1 to 8.0% by weight of magnesium, and optionally additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight, the balance being aluminum and optionally unavoidable impurities and residuals elements, wherein the ratio Al/Zn is above 2.9.
  • Metallic coatings according to the invention have a high sacrificial protection.
  • the metallic coating does not comprise elements selected among Cr, Mn, Ti, Ce, La, Nd, Pr, Ca, Bi, In, Sn and Sb or their combinations.
  • the metallic coating does not comprise any of the following compounds: Cr, Mn, Ti, Ce, La, Nd, Pr, Ca, Bi, In, Sn and Sb. Indeed, without willing to be bound by any theory, it seems that when these compounds are present in the coating, there is a risk that the properties of the coating, such as electrochemical potential, are altered, because of their possible interactions with the essential elements of the coatings.
  • the ratio Al/Zn is below or equal to 8.5.
  • the ratio Al/Zn is between 3.0 and 7.5, advantageously between 4.0 and 6.0. Without willing to be bound by any theory, it seems that if these conditions are not met, there is a risk that the sacrificial protection decreases because zinc rich phases are not in sufficient amount in the coating.
  • the coating layer further comprises an Al—Zn phase.
  • the metallic coating comprises from 10.0 to 20.0%, preferably from 10.0 to 15.0%, by weight of zinc.
  • the metallic coating comprises from 8.1 to 10.0% by weight of silicon.
  • the coating comprises from 3.0 to 8.0% by weight of magnesium, preferably, from 3.0 to 5.0% by weight of magnesium. Without willing to be bound by any theory, it has been found that the addition of magnesium in the above range further improve the anti-corrosion properties.
  • the microstructure of said coating comprising a Mg 2 Si phase.
  • the microstructure of said coating further comprises a MgZn 2 phase.
  • the amount of aluminum is above 71%, preferably above 76%, by weight.
  • the coating can be deposited by any methods known to the man skilled in the art, for example hot-dip galvanization process, electrogalvanization process, physical vapour deposition such as jet vapor deposition or sputtering magnetron.
  • the coating is deposited by hot-dip galvanization process. In this process, the steel sheet obtained by rolling is dipped in a molten metal bath.
  • the bath comprises zinc, silicon, aluminum and optionally magnesium. It can comprise additional elements chosen from Pb, Ni, Zr, or Hf, the content by weight of each additional element being less than 0.3% by weight. These additional elements can improve among others ductibility, coating adhesion on the steel sheet.
  • the bath can also contain unavoidable impurities and residuals elements from feeding ingots or from the passage of the steel sheet in the molten bath.
  • Residual element can be iron with a content up to 3.0% by weight.
  • the thickness of the coating is usually between 5 and 50 ⁇ m, preferably between 10 and 35 ⁇ m, advantageously between 12 and 18 ⁇ m or between 26 to 31 ⁇ m.
  • the bath temperature is usually between 580 and 660° C.
  • the steel sheet is usually wiped with nozzles ejecting gas on both sides of the coated steel sheet.
  • the coated steel sheet is then cooled.
  • the cooling rate is above or equal to 15° C.s ⁇ 1 between the beginning of the solidification and the end of the solidification.
  • the cooling rate between the beginning and the end of the solidification is superior or equal to 20° C.s ⁇ 1 .
  • a skin-pass can be realized and allows work hardening the coated steel sheet and giving it a roughness facilitating the subsequent shaping.
  • a degreasing and a surface treatment can be applied in order to improve for example adhesive bonding or corrosion resistance.
  • coated steel sheet according to the invention can be shaped by any method known to the man skilled in the art, for example cold-stamping and/or hot-forming.
  • the part is obtained by cold-stamping.
  • the coated steel sheet is cut to obtain a blank and then cold-stamped in order to obtain a part.
  • the part coated is obtained by a press hardening process including the hot-forming.
  • this method comprises the following steps:
  • a thermal treatment is applied to the blank in a furnace under non protective atmosphere at an austenitization temperature Tm usually between 840 and 950° C., preferably 880 to 930° C.
  • Tm austenitization temperature
  • said blank is maintained during a dwell time tm between 1 to 12 minutes, preferably between 3 to 9 minutes.
  • the coating forms an alloy layer having a high resistance to corrosion, abrasion, wear and fatigue.
  • the blank is then transferred to a hot-forming tool and hot-formed at a temperature between 600 and 830° C.
  • the hot-forming comprises the hot-stamping and the roll-forming.
  • the blank is hot-stamped.
  • the part is then cooled in the hot-forming tool or after the transfer to a specific cooling tool.
  • the cooling rate is controlled depending on the steel composition, in such a way that the final microstructure after the hot-forming comprises mostly martensite, preferably contains martensite, or martensite and bainite, or is made of at least 75% of equiaxed ferrite, from 5 to 20% of martensite and bainite in amount less than or equal to 10%.
  • a coated part according to the invention can thus obtained by cold or hot forming but also by any suitable combination of cold-stamping and hot-forming.
  • the part is a press hardened steel part having a variable thickness
  • the press hardened steel part of the invention can have a thickness which is not uniform but which can vary. Indeed, it is possible to achieve the desired mechanical resistance level in the zones which are the most subjected to external stresses, and to save weight in the other zones of the press hardened part, thus contributing to the vehicle weight reduction.
  • the parts with non-uniform thickness can be produced by continuous flexible rolling, i.e. by a process wherein the sheet thickness obtained after rolling is variable in the rolling direction, in relationship with the load which has been applied through the rollers to the sheet during the rolling process.
  • the part can be a front rail, a seat cross member, a side sill member, a dash panel cross member, a front floor reinforcement, a rear floor cross member, a rear rail, a B-pillar, a door ring or a shotgun.
  • the part is dipped in an e-coating bath.
  • the thickness of the phosphate layer is between 1 and 2 ⁇ m and the thickness of the e-coating layer is between 15 and 25 ⁇ m, preferably less than or equal to 20 ⁇ m.
  • the cataphoresis layer ensures an additional protection against corrosion.
  • paint layers can be deposited, for example, a primer coat of paint, a basecoat layer and a top coat layer.
  • the part Before applying the e-coating on the part, the part is previously degreased and phosphated so as to ensure the adhesion of the cataphoresis.
  • steel sheets used are 22MnB5.
  • All coatings were deposited by hot-dip galvanization process. All coatings have a thickness of 15 ⁇ m.
  • Trials according to the invention have a lower coupling potential than a coating comprising aluminum and 9% by weight of silicon. Coupling potentials of Trials 1 to 3 are under ⁇ 0.78V/SCE as required.
  • Trials 5 to 12 were prepared and subjected to a corrosion test to evaluate the cut edge protection of the coated steel sheets.
  • Trials 5 to 11 have very good protection against corrosion on the cut edges of coated steel sheet. By contrast, Trial 12 does not show enough corrosion resistance on the cut edges.
  • Trials 13 to 15 are sacrificial such as zinc coating. Coupling potential are under ⁇ 0.78V/SCE as required.
  • Trials 17 to 20 were prepared and subjected to a corrosion test to evaluate the protection of the coated steel sheets.
  • FIG. 1 illustrates one cycle corresponding to 168 hours, i.e. one week.
  • Trials 17 to 19 show excellent protection against corrosion, in particular when the coating comprises magnesium (Trials 18 and 19).
  • Trials 21 to 24 were prepared and subjected to a corrosion test to evaluate the protection of the coated steel sheets.
  • Thickness Coating ( ⁇ m) Number of cycles Trials Al Si Zn Mg 15 1 2 3 4 5 6 21* 81 9 10 — 15 0 0 0.5 1 2 3 22* 77 9 10 4 15 0 0 0 0 0 23* 73 9 10 8 15 0 0 0 0 0 0.5 24 0.2 — 99.8 — 10 0 0 0 1 2 3 *examples according to the invention.
  • Trials according to the invention have an excellent protection against corrosion, in particular when the coating comprises magnesium (Trial 22 and 23).
  • Trials 25 to 28 were prepared and subjected to a corrosion test to evaluate the protection of the coated steel sheets after austenitization treatment.
  • Trials 25 to 27 show good protection against corrosion compared to the coating comprising aluminum and silicon (Trial 28).
  • Trials 29 to 40 were prepared and subjected to an electrochemical potential test after austenitization treatment.
  • Trials 32 to 39 according to the present invention are and remain sacrificial protection over time.

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  • Materials Engineering (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
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  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Articles (AREA)
  • Laminated Bodies (AREA)
  • Shaping Metal By Deep-Drawing, Or The Like (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
US15/748,033 2015-07-30 2016-07-08 Steel Sheet Coated with a Metallic Coating based on Aluminum Abandoned US20180223409A1 (en)

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PCT/IB2015/001281 WO2017017483A1 (en) 2015-07-30 2015-07-30 Steel sheet coated with a metallic coating based on aluminum
PCT/IB2016/000977 WO2017017513A1 (en) 2015-07-30 2016-07-08 Steel sheet coated with a metallic coating based on aluminum

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