Classifications

• • 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
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys
• • 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
  • C21D1/18—Hardening; Quenching with or without subsequent tempering
• • 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
• • 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
  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
• • 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
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • 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
  • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
• • 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
  • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
  • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D3/00—Electroplating: Baths therefor
  • C25D3/02—Electroplating: Baths therefor from solutions
  • C25D3/56—Electroplating: Baths therefor from solutions of alloys
  • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
• • 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
• • 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
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/12771—Transition metal-base component
  • Y10T428/12861—Group VIII or IB metal-base component
  • Y10T428/12951—Fe-base component
  • Y10T428/12958—Next to Fe-base component

Definitions

• the invention relates to a method for producing a steel component provided with a metallic, corrosion-protective coating by forming a flat steel product made of a Mn steel which is provided with a ZnNi alloy coating prior to forming the steel component.
• a typical example of a steel suitable for hot press hardening is known by the name "22MnB5" and in the steel wrench 2004 under the name "22MnB5"
• Chlo ⁇ dionen concentrations high tendency to local although limited, but intense corrosion makes the
• Availability is also limited.
• a steel sheet is first provided with a Zxnk coating and then heated before the hot deformation so that when heated on the
• Coating on the steel sheet sets an intermetallic compound.
• Oi ese is to protect the steel sheet against corrosion and decarburization and during the
• Hot forming in the pressing tool take over a lubricating function.
• processing steel sheet for example, electrolytically or using another known
• thermoformed As particularly suitable for the
• the Zn layer may also be used as an alloy layer according to the known method
• EP 1 630 244 A1 mentions Mn, Ni, Cr, Co, Mg, Sn and Pb and also Be, B, Si, P, S, Ti, V, W, Mo, Sb, Cd , Nb, Cu and Sr as additional
• the 1-50 ⁇ m thick Zn coating present on it comprises an iron Zmk solid solution phase and has a zinc oxide layer whose average thickness is limited to not more than 2 ⁇ m.
• Required temperature selected so that it comes at best to a controlled oxide formation, or it is after hot forming the existing on the steel component obtained oxide layer by means of a span- or
• the actual zinc-nickel coating is then applied electrolytically. So that the electrolytic deposition of the alloy coating is constant with a predetermined composition, separate, each containing only one alloying element anodes are used. These are connected to separate circuits in order to adjust the current flowing through them and thus the delivery of the respective metal in the electrolyte targeted.
• the coating consisted essentially of zinc and additionally contained one or more oxygen-affine elements in a total amount of 0.1-15 wt .-% based on the total coating.
• the oxygen-affine elements are specifically named Mg, Al, Ti, Si, Ca, B and Mn.
• the steel sheet coated in this way was then brought to a temperature that was necessary for hardening under the action of atmospheric oxygen. In this heat treatment, a superficial oxide layer of the oxygen-affine element (s) formed.
• a ZnNi coating has been produced on a sheet of unspecified composition by electrochemical deposition of zinc and nickel. The weight ratio of zinc to nickel in the
• Corrosion protection layer was at a layer thickness of 5 microns about 90/10.
• the thus coated sheet has been annealed for 270 s at 900 0 C in the presence of atmospheric oxygen.
• the diffusion of the steel with the zinc layer resulted in a thin diffusion layer of zinc, nickel and iron.
• most of the zinc oxidized to zinc oxide is most of the zinc oxidized to zinc oxide.
• the underlying task is to provide a simple to implement in practice method that allows, with relatively little effort a steel component
• the first variant of the erfmdungsgedorfen method comprises forming the steel component in the so-called "direct" method, while the second
• Process variant includes the forming of the steel component in the so-called "indirect” method.
• Flat steel product ie a steel strip or steel sheet, provided, from a 0.3 to 3 wt .-% manganese-containing, higher-strength and curable
• this steel material may be a high strength MnB steel in per se known
• the steel processed according to the invention may contain 0.2-0.5% C, 0.5-3.0% Mn, 0.002-0.004% B, and optionally one or more elements of Group "Si, Cr, Al, Ti" contained in the following contents: 0.1-0.3% Si, 0.1-0.5% Cr, 0.02-0.05% Al, 0.025-0.04 % Ti.
• the inventive method is suitable for the production of steel components both from conventionally only hot rolled hot strip or sheet as well as from conventionally cold rolled steel strip or
• this coating comprises a zinc-nickel alloy coating applied electrolytically to the steel substrate, consisting of ⁇ -ZnNi single-phase phase.
• This ZnNi alloy coating alone can form the corrosion coating or be supplemented by further protective layers applied to it.
• the decisive factor is that the ⁇ -zinc-nickel phase of the ZnNi alloy coating resting on the steel substrate is already realized by the electrolytic coating. That is, unlike in coating processes, in which only m result of heating to the temperature required for the subsequent hot forming and curing and the thereby incipient
• Alloy layer of certain composition and structure composed of zinc and nickel.
• Deposition conditions during the production of the ZnNi alloy layer is selected so that the ZnNi alloy layer is formed as a single-phase, consisting of Ni5Zn21 phase coating with a cubic lattice structure. It should be noted that this ⁇ -ZnNi phase layer is not stoichiometric when deposited over an electrolyte
• the “deposition conditions" of the electrolytic coating are, for example, the type of flow on the substrate to be coated, the flow rate of the electrolyte, the Ni / Zn ratio of the electrolyte, the orientation of the electrolyte
• the desired single-phase ZnNi coating should be compatible with the
• Ni / Zn ratio of the electrolyte 0.4 - 4;
• Coating of the steel substrate can be done in both vertically and horizontally aligned cells
• Flat steel product with a ZnNi alloy layer of exactly predetermined composition and structure also consists in the fact that the coating produced from it has a matt, rough surface, the lower one
• coated steel flat products have an increased reflectivity than the Zn coatings typically produced in the course of known hot stamping processes.
• Flat steel product is then formed a steel plate. This can be divided in a conventional manner of the respective steel strip or steel sheet. It is also conceivable that the flat steel product in the
• Coating already has the shape required for the subsequent shaping of the component, ie the board corresponds.
• the steel component is at least preformed from the blank, and only then the heating to a component temperature of at least 800 ° C. is carried out.
• Amount end Blank or component temperature begins gradually at temperatures below 700 0 C m of the applied on the steel substrate ZnNi alloy layer a partial substitution of atoms, in which the lntermetallische ⁇ zinc lSJickel phase (Ni5Zn21) m is an r-ZmK Iron phase (Fe3ZnlO) rearranges. From about 750 0 C is then formed with further progressing heating an ⁇ -Fer ⁇ t mixed crystal, the Zn and Ni are present dissolved. This process continues until the
• Component temperature of at least 800 0 C is heated and is present on the steel substrate, a biphasic coating consisting of an ⁇ -Fe mixed crystal in which Zn and Ni are dissolved, and a mixed gamma phase Zn x Ni (Fe) 7 , m the Ni atoms are substituted by Fe atoms and vice versa.
• a biphasic coating consisting of an ⁇ -Fe mixed crystal in which Zn and Ni are dissolved, and a mixed gamma phase Zn x Ni (Fe) 7 , m the Ni atoms are substituted by Fe atoms and vice versa.
• Alloy coating which converts by far the largest part into mixed crystal in the annealing process for the shaping or hardening.
• the finished product thus has a coating which consists of at least 70% by weight, in particular at least 75%, and typically up to 95% by weight, in particular 75-90%, of mixed crystal and residues of intermetallic phase. Depending on the annealing conditions and the thickness of the respective coating, these are distributed as dispersed small-volume accumulations between the mixed crystals or are on the mixed crystal.
• the original alloy coating in the state diagram changes from the Zn-rich corner to the Fe-rich corner. Accordingly, an iron zinc alloy is present on the finished steel component. That is, in the procedure according to the invention, a coating is obtained which is no longer zinc-based but consists of an iron-based alloy.
• Method is the inventively heated to a temperature of at least 800 0 C board to the
• Shaped steel component This can be done, for example, that the board immediately after the heating to the mold used in each case is required. On the way to the mold, it is inevitable inevitable to a cooling of the board, so that in the case of such following the heating hot forming the temperature of the board when entering the mold is usually lower than the plate temperature at the outlet of the furnace.
• Forming the steel plate m is formed in a conventional manner to the steel component.
• Cool down cooling speed which is sufficient for the emergence of Vergutungs- or Hartegefuge in his steel substrate. This process is very special
• Heat treatment from this board formed the steel component.
• the shaping of the steel component takes place typically a cold forming operation wherein one or more cold forming operations are performed.
• the degree of cold forming can be so high that the steel component obtained is substantially completely finished.
• Hartevorgang be combxmert by the hard is performed as a molding in a suitable mold.
• the steel component is placed in a finished final shape imaging tool and for the
• the form hardening thus enables a particularly good dimensional stability of the steel component.
• the change in shape during the molding process is usually low.
• the Mn present in the steel substrate in the steel component produced according to the invention contributes to the good adhesion of the coating.
• Component temperature contains the invention
• the Mn atoms diffusing into the ZnNi alloy layer upon heating cause an intensive coupling of the coating to the steel substrate.
• Mn oxide layer typically 0.1 - 5 microns.
• the positive effects of the Mn oxide layer are particularly safe when their thickness is at least 0.2 .mu.m, in particular at least 0.5 microns.
• the Mn content of the anticorrosive coating is in this near-surface, adjacent to the surface Mn-containing layer at 1-18 wt .-%, in particular 4-7 wt .-%.
• the deposited on the coating produced in accordance with the invention ensures a pronounced Mn oxide layer of a particularly good adhesion of the
• the inventive approach is therefore particularly suitable for the production of parts for vehicle bodies, which are provided after their shaping with a paint job.
• oxide layer according to the invention is not absolutely necessary. Rather, a practice-oriented embodiment of the process variants according to the invention provides that the oxide layer obtained by the procedure according to the invention remains selectively on the corrosion protection coating, since this oxide layer not only has a particularly good coatability, but due to its
• a coating produced at least 0.3% by weight of Mn-containing steel has a brownish surface which is free from tipping and flaking.
• deposited ZnNi coating is applied in practice with a thickness of 0.5 - 20 microns.
• ZnNi coating sets itself then when it is deposited more than 2 microns thick on the flat steel product.
• Typical thicknesses of a coating produced according to the invention are in the range from 2 to 20 ⁇ m, in particular from 5 to 10 ⁇ m.
• the ZnNi alloy coating applied to the flat steel product comprises a Zn layer which is also applied to the ZnNi layer prior to the heating step. It then lies on the for the
• the additionally applied, typically 2.5-12.5 ⁇ m thick Zn layer is present in the finished steel component according to the invention as a Zn-rich layer, into the Mn and Fe of the steel substrate and Ni from the ZnNi layer
• Zn partially reacts to Zn oxide and forms with the Mn from the base material produced on the erfmdungsgeatti
• thermoformed and cured state even at
• the Mn oxide layer described in detail above is present. This is just as in a combination of a ZnNi and Zn-layer corrosion protection coating the good weldability and the good suitability of a
• the additional Zn layer of the corrosion protection coating can be deposited electrolytically, just like the previously applied ZnNi layer. This can be done, for example, in a continuous pass through, multi-stage device for electrolytic - -
• a steel component according to the invention is produced by hot press molding and has a steel substrate consisting of 0.3-3 wt% manganese steel and a corrosion protection coating applied thereto comprising a coating layer comprising at least 70 mass% ⁇ -Fe (Zn, Ni) mixed crystal and the remainder of an intermetallic compound of Zn, Ni and Fe, and has on its free surface a Mn-containing layer in which Mn is present in metallic or oxidic form.
• the annealing temperature and the thickness of the coating layer are the
• the anticorrosive coating m in the manner already described above may comprise a Zn layer resting on the ZnNi layer, wherein also in this case the Mn-containing layer on the
• Corrosion protection coating is present.
• the flat steel product before the electrolytic coating in a conventional manner may be subjected to a pretreatment in which the surface of the steel substrate is treated so that it has a for the subsequently performed coating with the corrosion layer optimally prepared
• Degreasing bath is 20 - 85 0 C, with a particularly good activity at a bath temperature of 65 - 75 0 C sets. This is especially true if the degreasing is carried out electrolytically, in which case particularly good cleaning results are achieved when at least one cycle of anodic and cathodic sample polarity is passed through. It may prove advantageous if at the
• Attack surface of the flat steel product itself Through the deliberately carried out step of pickling the Oxidabtrag is controlled so that one for the electrolytic banding favorably set surface obtains. After picking, rewinding of the flat steel product may be expedient to remove remnants of the acid used in pickling from the flat steel product.
• the flat steel product can meanwhile
• a hood-annealed cold-rolled strip becomes alkaline
• the degreasing bath at a concentration of 15 g / l contains a commercial cleaner available under the name "Ridolme C72" containing more than 25%
• the bath temperature amounts to 65 0 C.
• the dwell time in the spray degreasing is 5 s. This is followed by a burst cleaning. In the course of the tape is electrolytic
• the residence time in the coil is 3 s.
• a hydrochloric acid (20 g / l, temperature 35-38 0 C) is passed through with a residence time of 11 s. After an 8 s coil with
• the plate is überbowt after passing through a squeezing in the electrolysis cell.
• emerging flat steel product can be multi-stage rinsed with water and demineralized water at room temperature.
• the total residence time in the coil is 17 s.
• the flat steel product then passes through a drying section.
• the degreasing bath contains a concentration of 20 g / l
• the residence time is 3 s.
• the following is a
• the sheet is after passing through a
• Embodiments described, provided in accordance with the invention with a corrosion protection coating After leaving the plant to the electrolytic
• Coating the now coated according to the invention flat steel product is rinsed in three stages with demineralized water at 50 0 C. Following the sample passes through a drying section with circulating air dryer, wherein the
• Air temperature is more than 100 0 C.
• Bonnet annealed cold strip of grade 22MnB5 (1.5528) is alkaline degreased and degreased electrolytically.
• the degreasing bath at a concentration of 20 g / l contains a cleaner containing 1-5% C12-18 fatty alcohol polyethylene glycol butyl ether and 0.5-2% potassium hydroxide.
• the bath temperature is 75 0 C.
• Dwell time in the horizontal spray rinse is 12 s. This is followed by a double brush cleaning at.
• the strip is electrolytically degreased at a residence time of 9 s with anodic and cathodic polarity and a current density of
• the length of stay is 3 s. in the
• Sp ⁇ tzf ⁇ schwaserspule is the sheet after the
• Corrosion protection coating as explained below with reference to the exemplary embodiments. Subsequent to the electrolytic coating is then in
• Steel component is carried out as hot forming following the heating to the board or component temperature so that the heated board ("direct” method) or the heated steel component ("indirect” method) at the expense of a certain
• the heating to the board or component temperature can be done in a conventional manner in a continuous flow in a continuous furnace.
• Typical quenching times are in the range of 3 to 15 mm, whereby a coating layer which on the one hand is optimally designed and on the other hand particularly economical production conditions result when the quenching times are in the range of 180 to 300 s or the quenching is terminated as soon as the quenching time is reached
• respective steel substrate is warmed by the coating applied to it.
• Fig. 1 shows the result of a GDOS measurement of a
• FIG. 2 shows the measurement result illustrated in FIG. 1 in isolation for the element Mn;
• FIG. Fig. 3 is a schematic representation of the structure of a coating at different times of production;
• electrolytic galvanizing line have been provided with a ZmkNickel alloy layer.
• a sample "Z" has been hot-dip coated for comparison.
• Samples A-Q and Z each contained Mn contents of more than 0.3 wt%, while the Mn contents of Samples Vl, V2 were below the threshold of 0.3 wt%.
• Each of the band-shaped samples A-V2 has first undergone a cleaning treatment, in the following
• Hydrochloric acid at a concentration of 150 g / l at room temperature.
• the sample Z has been conventionally hot-dip galvanized.
• Table 2 in addition to the Mn contents of the respective samples A-V2, the characteristics of the ZnNi coatings are
• Blanks 31-35, from the due to the high Ni content of their coating also not considered to be inventions sample Q a board 36, from the
• Comparison produced samples Vl and V2 boards 31 - 40 and from the comparison sample Z a board 41 has been divided.
• the boards 1 to 41 are then on the in
• the steel components made from blanks 37-40 divided from comparative samples V1 and V2 showed flaking and insufficient corrosion resistance of the coating. As this is a
• GDOS Glow Discharge Optical Emission Spectrometry
• Fig. 1 is the typical result of the GDOS measurement of corrosion protection coating of a m erfmdungsgeschreiber manner generated and procured steel component shown.
• a recrystallized cold strip is first electrolytically with a, as in the inventive samples described above
• ZnNi alloy coating has been plated.
• the layer thickness of the ⁇ -ZnNi alloy coating was 7 ⁇ m at a Ni content of 10%. Subsequently, on these
• ZnNi alloy coating also electrolytically a 5 micron thick, pure zinc Zn layer has been applied.
• Anticorrosive coating provided cold strip boards have been divided, which have been heated to a platinum temperature of 880 0 C within 5 minutes. After hot working and hardening, a corrosion protection layer was present on the resulting steel component. At the The surface also had a pronounced Mn oxide layer under which a Zn-rich layer existed, under which was again a ZnNi layer resting on the steel substrate.
• the coating is single phase, intermetallic, of gamma-Zmk nickel (Ni5Zn21). At most there is a very thin native oxide skin that is negligible in its effect, which is free of Mn. b) heating up to about 750 ° C. (FIG. 3, FIG. 2)
• the coating is metallographically biphasic. Both gamma phases are formed, each partially replacing Fe with Ni and vice versa. The phases are isomorphic with respect to their crystal structure. It is characteristic that the Ni content in the coating m
• composition of the ⁇ -ZnNi (Fe) and the F-FeZn (Ni) phase of the coating are given in the following table:
• the Zn / Mn oxide layer is still present.
• the coating turns out to be metallographic and radiographic two-phase. It forms a mixed gamma phase ( ⁇ / F-ZnNi (Fe)) from. It is characteristic that this phase is rather rich in Ni.
• ⁇ / F-ZnNi (Fe) is rather rich in Ni.
• ⁇ -Fe Solid solution in which Zn and Ni are dissolved. The obsession occurs due to the high
• composition of the layers of the coating are given in the following table:
• the finished component is always a two-phase coating, consisting of an ⁇ -Fe Mischk ⁇ stall in which Zn and Ni zwangsgelost present and a mixed gamma phase Zn x Ni (Fe) y , substituted in the Ni atoms by Fe atoms and vice versa.
• the mixed gamma phase is " ⁇ / r-ZnNi (Fe)" in the ⁇ -Fe
• composition of the layers of the coating are given in the following table:
• FIG. 3 two states of the coating obtained after completion of the annealing treatment are shown in FIG. 3, FIGS. 3 and 4.
• FIG. 3 Figure 3 indicates the state of the coating, which occurs when comparably low annealing temperatures, short furnace lay times or large
• FIG. 4 shows a photomicrograph of a cut of a coating produced in accordance with the invention and in this state.
• Fig. 3, Figure 4 shows a structure of the coating, which sets at high annealing temperatures, comparably long annealing time or lower coating thickness of the coating.
• the state shown in Fig. 3, Fig. 3, and Fig. 4 represents an intermediate stage, which is passed on the way to the state shown in Fig. 3, Figure 4, state.
• Fig. 5 is a
• phase c) (FIG. 3, FIGS. 3 and 4) the ⁇ - Fe (Zn, Ni) mixed crystal ⁇ 30 mass% Zn and the
• the invention thus provides a method with which a component provided with a metallic coating which adheres well and is particularly effective against corrosion can be produced in a simple manner.
• a steel material containing from 0.3 to 3 wt .-% manganese and a yield strength of 150 - 1100 MPa and a tensile strength of 300 - 1200 MPa having produced
• a board is then obtained, which is either heated directly to at least 800 0 C and then formed into the steel component or first formed to the steel component, which is then heated to at least 800 0 C.
• the steel component obtained in each case is finally hardened by being cooled with a sufficient for the formation of hardness structure cooling rate from a temperature at which the steel component in a for the formation of temper or hardened structure

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• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Mechanical Engineering (AREA)
• Electrochemistry (AREA)
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• Crystallography & Structural Chemistry (AREA)
• Thermal Sciences (AREA)
• Physics & Mathematics (AREA)
• Electroplating Methods And Accessories (AREA)
• Other Surface Treatments For Metallic Materials (AREA)
• Laminated Bodies (AREA)
• Coating With Molten Metal (AREA)
• Heat Treatment Of Articles (AREA)
• Application Of Or Painting With Fluid Materials (AREA)

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• 2009
  • 2009-08-25 AT AT09168605T patent/ATE554190T1/de active
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• 2010
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  • 2010-02-24 ES ES10706201T patent/ES2400221T3/es active Active
  • 2010-02-24 EP EP10706201A patent/EP2414562B1/fr not_active Revoked
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