EP3215656A1 - Procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables et revêtement anti-corrosion pour tôles d'acier trempables - Google Patents

Procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables et revêtement anti-corrosion pour tôles d'acier trempables

Info

Publication number
EP3215656A1
EP3215656A1 EP15791573.7A EP15791573A EP3215656A1 EP 3215656 A1 EP3215656 A1 EP 3215656A1 EP 15791573 A EP15791573 A EP 15791573A EP 3215656 A1 EP3215656 A1 EP 3215656A1
Authority
EP
European Patent Office
Prior art keywords
layer
zinc
nickel
manganese
steel
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.)
Granted
Application number
EP15791573.7A
Other languages
German (de)
English (en)
Other versions
EP3215656B1 (fr
Inventor
Siegfried Kolnberger
Ernst Commenda
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.)
Voestalpine Stahl GmbH
Original Assignee
Voestalpine Stahl GmbH
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 Voestalpine Stahl GmbH filed Critical Voestalpine Stahl GmbH
Publication of EP3215656A1 publication Critical patent/EP3215656A1/fr
Application granted granted Critical
Publication of EP3215656B1 publication Critical patent/EP3215656B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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
    • C23C2/04—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
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
    • 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
    • C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
    • C21D8/04—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing
    • C21D8/0478—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips to produce plates or strips for deep-drawing involving a particular surface treatment
    • 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
    • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
    • C21D9/48—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals deep-drawing sheets
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/26—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
    • C23C2/26—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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
    • C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/40—Coatings including alternating layers following a pattern, a periodic or defined repetition
    • C23C28/42—Coatings including alternating layers following a pattern, a periodic or defined repetition characterized by the composition of the alternating layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/10—Electroplating with more than one layer of the same or of different metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/625—Discontinuous layers, e.g. microcracked layers
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/62—Quenching devices
    • C21D1/673—Quenching devices for die quenching
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment

Definitions

  • the invention relates to a method for producing a corrosion protection coating for hardenable steel sheets and a corrosion protection layer for hardenable steel sheets.
  • Both methods have in common that a steel strip is produced from a steel material by hot rolling, and typically also subsequent cold ⁇ rollers and the steel strip is subsequently galvanized ⁇ hd continuously.
  • Driving the usual delay inkungsver- here is the hot-dip galvanizing, in which the steel strip is passed through a trough of liquid zinc, the liquid zinc adheres to the steel, the galvanized steel strip übli ⁇ chlay is supported vertically from the trough and subsequently ⁇ chd excess zinc stripped with scraper nozzles and the belt is then optionally subjected to a heat treatment.
  • the galvanized steel strip produced in this way is then usually delivered in coils, ie wound up.
  • the boards are formed in a conventional manner in a multi-stage process and in particular special deep-drawn until the component is molded in its final appearance.
  • the component is usually formed in all three spatial directions about 2% klei ⁇ ner to a subsequent thermal expansion to take into ⁇ into account.
  • this sheet metal component is heated to a tempering temperature, ie a temperature above AC 3, and optionally held until the steel material is present in the austenitic phase.
  • the heated sheet steel component is transferred to a mold hardening tool and held in the mold hardening tool, in which the heated steel ⁇ sheet metal component is usually used form-fitting, pressed by a die and a male, but not substantially reshaped.
  • the steel ⁇ part is cooled at a rate above the critical Härtege ⁇ speed, resulting in a transformation of the austenite substantially to martensite and high hardness of the component is obtained.
  • the board is heated directly to a necessary for curing temperature above AC 3 ⁇ and optionally held and then shaped in a mold consisting of male and female parts in a single stage ⁇ gen stroke and at the same time by the abutment of the tool on the workpiece so quickly cooled that the above skiz ⁇ ed curing occurs.
  • This procedure is press hardening ge ⁇ Nannt.
  • the hot stamping is superior to the press hardening with regard to the possible geometries of a component, as in a multistage ⁇ gen forming process complicated or complex three-dimensional shapes can be achieved with only relatively simple geometries can be generated during the stage reshaping press hardening.
  • the end result of both processes is a hardened sheet steel component.
  • a method for producing a z coating with a corrosion protection provided and formed from a high-strength steel sheet material formed sheet metal part comprises the steps of shaping a starting sheet material to a sheet provided ⁇ molding, formation of the Korrosionsschut zbe slaughterung by electrolytic application of a zinc-nickel coating to the sheet metal part, wherein at the beginning of the coating process First, a thin nickel layer is deposited, which further prevents hydrogen embrittlement of the steel sheet material. Further, a hot-molded and in particular ⁇ sondere press hardened sheet metal formed part made of a high-strength steel sheet material with an electrolytically applied zinc-nickel coating is known therefrom. The purpose of this is to provide the nickel layer as a barrier against ty ⁇ pisch enough, in the steel sheet material brought into the electrolytic coating is hydrogen.
  • EP 2 290 133 B1 discloses a method for producing a steel component provided with a metallic coating that protects against corrosion, and the steel component itself.
  • ⁇ with a practically simple to carry out method to be created, which allows comparably little effort to produce a steel component which is provided with a well-haf ⁇ Tenden and safely protected from corrosion metallic coating, since it is indicated that zinc coatings on the Steel sheet types do not adhere well to hot press hardening.
  • known coatings by oxidation of the surface should have a poor paint adhesion.
  • the applied corrosion protection layer should be an electrolytically brought to ⁇ ⁇ -ZnNi phase, which is to tolerate then made heating operations well for the purpose of austenitization.
  • EP 0 364 596 B1 relates to a process for the production of zinc-nickel alloy-coated thin sheets with good compression molding properties, wherein the formability of such sheets is to be improved by a zinc-nickel alloy coating.
  • the layer is to be deposited with about 30 g / m 2 and a nickel content of 12.5%.
  • the object of the invention is to provide a method for producing hardened sheet steel components.
  • an at least two-layer corrosion ⁇ protective layer is formed on a steel sheet, whereby this ent ⁇ neither a very thin nickel layer of 1 pm is electrolytically deposited on the steel and then a zinc layer ⁇ also electrodeposited on the nickel layer ask ⁇ secreted is or thin Nickel layer is formed on the steel sheet via an electro ⁇ lytic deposition and then a zinc layer is applied via hot dip galvanizing.
  • a further possibility is to apply to a normal hot-dip ⁇ zinktes steel strip via a corresponding after-treatment (coater) a nickel-containing layer.
  • the nickel layer according to the invention has about 1 pm thickness, when they will be ⁇ introduced via electrolytic deposition as the first layer.
  • the outer nickel-containing layer is about 250 nm to 700 nm thick.
  • the nickel in no form forms a barrier against the ingress of liquid zinc to the steel, but rather the nickel reacts very quickly with the zinc and also with iron.
  • the melting point of the entire corrosion ⁇ protection layer increases sharply, since instead of zinc-iron ⁇ -phases zinc-nickel-iron phases are increasingly formed, which have a much higher melting point.
  • no liquid phases are ⁇ that may interact with the austenite.
  • nickel instead of nickel, or layers on the basis of nickel, other elements forming with Zn or Fe in ⁇ termetallisch baser phases onspotenzial have a higher oxidation as Zn, are as Cu, Co, Mn or Mo is used, since manganese, molybdenum, cobalt and copper achieve the same effects. "Based on” here means that these elements predominantly (> 50 wt .-%) are included, but other elements are present as alloying elements. Both nickel and cobalt as well as manganese or copper do not act as a physical barrier against the diffusion of zinc and iron, but are dissolved and incorporated in the molten zinc and zinc-iron phases. In the case of a previously applied nickel layer and subsequent hot-dip galvanizing, the nickel is at least already dissolved by the zinc melt during galvanizing.
  • phase structure forms a similar phase structure of the layer as in pure hot-dip galvanized layers (phs-Ultraform), but this phase structure is zinc-rich or has a greater proportion of ⁇ -phases. That these phases are more zinc-rich, is advantageous for the cathodic corrosion protection performance of the layer.
  • the invention is exemplified erläu ⁇ tert reference to a drawing. It shows:
  • Figure 1 processing a light microscopic etched Schliffanknähme ei ⁇ nes steel sheet with the inventive coating, which on a 1 pm thick nickel intermediate Layer a hot dip galvanized layer wur ⁇ de;
  • Figure 2 the layer of Figure 1 in an enlarged view.
  • Figure 3 a layer of Figure 1, wherein by EDX element mapping the elements iron, zinc, nickel and aluminum are shown in their distribution at a 1 pm thick applied nickel intermediate layer.
  • FIG. 4 shows a micrograph of the coating with a nickel layer 0.5 ⁇ m thick and a zinc coating 10 ⁇ m thick annealed at 800 ° C .;
  • FIG. 5 shows the layer according to FIG. 4 with a nickel layer 1 pm thick
  • Figure 6 a coating according to the invention after annealing, a holding time, a transfer time and an on ⁇ closing cooling for press hardening;
  • FIG. 7 shows an X-ray micrograph of a corrosion protection layer according to the invention after austenitizing annealing at 870 ° C.
  • FIG. 8 shows the layer according to FIG. 7 with the distribution of the iron
  • FIG. 9 shows the layer according to FIG. 7 with the distribution of the zinc
  • FIG. 10 shows the layer of Figure 7 with the distribution of nickel, wherein nickel as a preparation aid of a support layer ⁇ is applied to the surface;
  • FIG. 11 shows the layer according to FIG. 7 with the distribution of the aluminum;
  • FIG. 12 shows the layer according to FIG. 7 with the distribution of manganese
  • FIG. 13 shows a coating according to the invention after austenitizing and quenching with an indicated EDX scan line
  • FIG. 14 shows the coating according to FIG. 13 with the scan profile for the elements iron, nickel and zinc
  • FIG. 15 four V samples with a bending radius of 1.5 mm.
  • Divide the process of the invention for generating Stahlblechbau ⁇ may be either a press hardening method or a form hardening process be, that is, a method in which a steel sheet member is heated and is then schreck cured in a mold from ⁇ (hot stamping), or a method in which a board stage is reformed and quench hardened (press hardening).
  • a boron-manganese steel is used as the steel material for press-hardening or mold-hardening, in which, with regard to the transformation of the austenite into other phases, the transformation can shift into deeper regions and martensite is formed.
  • transformation retarder in such steels, ie as an element which shifts the phase transformation of austenite to Mar ⁇ tensit to lower temperatures, in particular the alloying elements boron, manganese, carbon and optionally chromium and molybdenum are present.
  • Titanium (Ti) 0, 01-0, 08
  • steel assemblies have proved to be suitable as follows (all figures in weight percent):
  • Titanium (Ti) 0, 03-0, 04
  • the conventional steels 22MnB5 or 20MnB8 are suitable.
  • a corrosion protection layer of the invention is an at least two layers ⁇ applied corrosion protective layer, wherein at least a nickel layer and a zinc layer are applied to a substrate made of a hardenable steel material. Instead of a nickel layer and a manganese or Kup ⁇ fertik can be applied.
  • the nickel, copper or manganese layer preference ⁇ example is applied electrolytically.
  • the zinc coating can be applied elekt ⁇ rolytisch or a hot-dip process.
  • the nickel layer and ⁇ closing apply a zinc layer, wherein the nachträg ⁇ Lich applied zinc layer is applied electrolytically or by hot dipping.
  • a further possibility is to apply the zinc layer as the first layer electrolytically or hot-dip process and then a nickel layer thereon applied on the outermost surface, and more particularly elekt ⁇ rolytisch deposit.
  • the element nickel is hereby also used for copper and manganese.
  • FIG. 1 shows a light-microscopic etched section of the layer according to the invention on a steel substrate.
  • this is once again enlarged represents ⁇ .
  • Nickelzwi ⁇ rule layer is first applied to the steel substrate and subsequently hot-dip galvanized ⁇ td, wherein the nickel was ⁇ interlayer dissolved in the zinc bath in the hot dip galvanizing.
  • each layer are juxtaposed, in which once the nickel intermediate layer has a thickness of 0.5 pm (Fig. 4) and once a layer thickness of 1 pm (Fig. 5) has ⁇ te. On each of these a hot-dip galvanized layer of 10 pm is deposited. Both layer samples were then heated to 800 ° C. The topmost light coat does not belong to the anticorrosive layers, it is a preparation auxiliary layer of nickel, which was applied before the sample preparation, ie after heating and cooling.
  • FIG. 6 A layer according to FIG. 6 was measured with an EDX element distribution, a nickel support layer also being present on the sample as a preparation aid.
  • Fig. 8 In the distribution of iron (Fig. 8), it can be seen that rela tive ⁇ little iron is present in the light phase while the dark phase exhibiting significant levels of iron.
  • Nickel (Figure 10) is still very poorly visible in the bright zinc matrix, but is apparently absent in the iron-rich nodules, while aluminum (Figure 11) is relatively uniform throughout the layer, albeit with accumulations in the zinc layer iron-rich phases.
  • Manganese which is present in the base steel material, is scarcely present in the entire layer and can only be detected in the substrate.
  • the element distribution was determined in depth with a so-called EDX line scan (FIG. 13).
  • the scan already begins in the nickel support ⁇ layer and goes deep into the steel base material.
  • the invention thus makes it possible to take an additional Ni ⁇ ckel slaughter an impact on the corrosion protection layer ba ⁇ sierend on zinc, in the way that this layer forms obviously faster solid phases upon cooling, which then during the shaping does not match the austenite of Stahlsub ⁇ strats react.
  • the zinc-rich bright phases of the coating more nickel dissolves than in the dark iron-rich phases, which by themselves have a higher melting point.
  • the invention Compared with a zinc-nickel layer deposited uniformly via electrolysis, the invention has the advantage that it permits a mixed application in electrolytic and melt-dip coating processes. Furthermore, the nickel layer can be applied to conventional, already galvanized sheets readily which purpose both elekt ⁇ rolytician coatings can be applied as well as other coating methods such.
  • B. roll application ie, a roll coating method, such as a coil coating method, in which a nickel-containing layer is applied with egg ⁇ ner thickness of 250 nm to 700 nm.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electrochemistry (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

L'invention concerne un procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables, au moins deux couches de métal étant successivement appliquées sur le substrat d'acier, l'une des couches de métal étant une couche de zinc ou à base de zinc, l'autre étant une couche d'un métal formant avec le Zn ou le Fe des composés intermétalliques communs et présentant un potentiel d'oxydation supérieur à celui du Zn, soit du Ni, du Cu, du Co, du Mn ou du Mo, ou une couche à base de ces métaux. L'invention concerne également un revêtement anti-corrosion pour tôles d'acier trempables.
EP15791573.7A 2014-11-04 2015-11-04 Procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables et revêtement anti-corrosion pour tôles d'acier trempables Active EP3215656B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014116085 2014-11-04
PCT/EP2015/075702 WO2016071399A1 (fr) 2014-11-04 2015-11-04 Procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables et revêtement anti-corrosion pour tôles d'acier trempables

Publications (2)

Publication Number Publication Date
EP3215656A1 true EP3215656A1 (fr) 2017-09-13
EP3215656B1 EP3215656B1 (fr) 2019-10-16

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EP15791573.7A Active EP3215656B1 (fr) 2014-11-04 2015-11-04 Procédé de production d'un revêtement anti-corrosion pour tôles d'acier trempables et revêtement anti-corrosion pour tôles d'acier trempables

Country Status (4)

Country Link
US (1) US20170321314A1 (fr)
EP (1) EP3215656B1 (fr)
DE (1) DE102015118869A1 (fr)
WO (1) WO2016071399A1 (fr)

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US20170321314A1 (en) 2017-11-09
DE102015118869A1 (de) 2016-05-04
WO2016071399A1 (fr) 2016-05-12

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