EP2021132A1 - Mit einem korrosionsschutzsystem versehenes stahlblech und verfahren zum beschichten eines stahlblechs mit einem solchen korrosionsschutzsystem - Google Patents

Mit einem korrosionsschutzsystem versehenes stahlblech und verfahren zum beschichten eines stahlblechs mit einem solchen korrosionsschutzsystem

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Publication number
EP2021132A1
EP2021132A1 EP07729270A EP07729270A EP2021132A1 EP 2021132 A1 EP2021132 A1 EP 2021132A1 EP 07729270 A EP07729270 A EP 07729270A EP 07729270 A EP07729270 A EP 07729270A EP 2021132 A1 EP2021132 A1 EP 2021132A1
Authority
EP
European Patent Office
Prior art keywords
layer
metallic
plasma polymer
steel product
flat 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.)
Withdrawn
Application number
EP07729270A
Other languages
German (de)
English (en)
French (fr)
Inventor
Krasimir Nikolov
Nicole Weiher
Bernd Schuhmacher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ThyssenKrupp Steel Europe AG
Original Assignee
ThyssenKrupp Steel AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ThyssenKrupp Steel AG filed Critical ThyssenKrupp Steel AG
Publication of EP2021132A1 publication Critical patent/EP2021132A1/de
Withdrawn legal-status Critical Current

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    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/06—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material characterised by the coating material
    • C23C14/14—Metallic material, boron or silicon
    • C23C14/16—Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/02—Pretreatment of the material to be coated
    • C23C14/024—Deposition of sublayers, e.g. to promote adhesion of the coating
    • C23C14/025—Metallic sublayers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/62—Plasma-deposition of organic layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • 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
    • C23C14/00—Coating by vacuum evaporation, by sputtering or by ion implantation of the coating forming material
    • C23C14/58—After-treatment
    • C23C14/5806—Thermal 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
    • 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
    • C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
    • 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
    • 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
    • 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
    • C23C28/021—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 including at least one metal alloy 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
    • C23C28/02—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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
    • B05D2701/40—Coatings being able to withstand changes in the shape of the substrate or to withstand welding withstanding welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • 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
    • Y10T428/12556—Organic component
    • Y10T428/12569—Synthetic resin

Definitions

  • the invention relates to a steel flat product provided with a multi-layer corrosion protection system, such as sheet metal or strip, and to a method for coating a flat steel product with a multilayer corrosion protection system.
  • a multi-layer corrosion protection system such as sheet metal or strip
  • the protective effect of the zinc layer is the greater, the thicker the coating is.
  • great zinc coating thicknesses which ensure particularly good corrosion resistance, are counteracted by the decreasing weldability of the metal sheets coated with the zinc layer as the coating thickness increases.
  • processing problems when using laser welding at high welding speeds a Through-welding of the parts to be joined is to be produced. Therefore, the demands made on the processability of coated in a conventional manner with a 5 - 15 microns thick zinc layer sheets that are used today, for example, in the field of bodywork or the construction of household appliances, often do not meet.
  • the corrosion resistance of zinc-coated sheets can be further improved by applying a so-called "anticorrosive primer" with a thickness of the coating set to average values of 7.5 ⁇ m.
  • anticorrosive primer with a thickness of the coating set to average values of 7.5 ⁇ m.
  • Corrosion resistance meet the coated steel sheets so still do not meet the requirements that are made, for example in the field of automotive bodywork on the weldability of sheet metal parts that are exposed to high loads in practical use.
  • the invention was based on the object to provide a provided with a Uberzugsystem steel flat product, which has such an optimized combination of corrosion resistance and weldability in the coated state, that it also meet the increasing demands of the processors of such sheets becomes.
  • a method for producing such sheets should be specified.
  • a flat steel product comprising, according to the invention, a base layer formed from a steel and a corrosion protection system applied to the base layer, which has a metallic coating less than 3.5 ⁇ m thick, which from a first to the base layer coated metallic layer and a second applied to the first metallic layer second metallic Layer is formed, wherein the second metallic layer with the first metallic layer has formed a metallic alloy, and comprises a deposited on the metallic coating plasma polymer layer.
  • the above-stated object has been achieved in accordance with the invention by applying a first metallic layer to a steel substrate forming the base layer of the flat steel product and a second metallic layer to the first metallic layer which is alloyed as a result of a heat treatment with the first metallic layer, wherein the total thickness of the metallic coating formed from the first and second metallic layers is less than 3.5 ⁇ m, formed on that of the first and second metallic layers Coating a plasma polymer layer is applied.
  • the thickness of the plasma polymer layer applied to the metallic coating according to the invention is preferably limited to at most 2500 ⁇ m. Surprisingly, it has been found that particularly good properties of the steel sheet according to the invention can be guaranteed, especially with small thicknesses of the plasma polymer layer. As a result, the thickness of the plasma polymer layer is advantageously limited to 100-1000 nm, in particular 200-500 nm. In a steel strip or sheet provided according to the invention with a multilayer, thin corrosion protection system, an optimum combination of the advantages of the different corrosion protection properties of the various layers is achieved. Thus, a flat steel product according to the invention has a high resistance to corrosion, both in a bright state and in combination with organic coatings.
  • inventive sheets have a good resistance to stone chipping.
  • DIN 55996-1B it could be proven in the stone impact test carried out in accordance with DIN 55996-1B that According to the invention steel sheets caused by stone chipping no flaking of the coating of the base layer.
  • the good corrosion resistance of the coated steel sheets or strips according to the invention in combination with their excellent paint adhesion, their good resistance to stone chipping and their good spot and laser weldability makes inventive flat steel products particularly suitable for use as materials for automotive body construction or construction of household appliances.
  • the thin multilayer anticorrosion system is comprised of at least one layer which provides electrochemical protection of the base layer steel substrate, a layer resting thereon capable of forming an alloy coating with the first layer, and so on to a significant improvement of the corrosion protection by additional electrochemical protection mechanisms of the metal sheet or strip leads, as well as from another layer - the plasma polymer layer - formed, which leads in their capacity as a barrier and / or passive layer to a further improvement of the corrosion protection.
  • the total thickness of the metallic support is less than 3.5 ⁇ m according to the invention and that the thickness of the plasma polymer layer applied to the metallic coating is also limited to less than 2500 nm.
  • the first metallic layer may, for example, be a pure zinc coating which can be economically applied to the steel substrate by electrolytic galvanizing, hot-dip galvanizing or vacuum evaporation in a conventional manner.
  • the first metallic coating may also consist of Al, a Zn-Ni, a Zn-Fe or a Zn-Al alloy.
  • the second metallic layer of the coating system according to the invention is preferably a zinc alloy coating (Zn-Y).
  • Zn-Y zinc alloy coating
  • This zinc alloy coating occurs when a metal is applied to the first layer that forms a Zn alloy with the first Zn-containing layer.
  • the metallic, with the first layer an alloy incoming second layer For example, by - preferably carried out in a vacuum - thermal evaporation are deposited on the first layer.
  • This procedure is particularly suitable when the second metallic layer is a finely structured magnesium layer having a thickness of 100-2000 nm, preferably 100-1000 nm.
  • the second metallic layer In addition to Mg, other metals have proven to be suitable materials for the second metallic layer. For example, by using Al, Ti, Cr, Mg, Ni or their alloys, the requirements imposed on the second layer can be met.
  • the plasma polymer layer applied to the metallic coating according to the invention can be formed, for example, from organosilane compounds, hydrocarbon compounds, organometallic compounds or mixtures thereof.
  • a particularly uniform formation of the plasma polymer layer applied to the metallic coating according to the invention can be achieved by depositing the plasma polymer layer by means of hollow cathode glow discharge.
  • the hollow cathode glow discharge high plasma densities and correspondingly high deposition rates can be achieved. Therefore, this possibility of generating the plasma polymer layer is particularly suitable for large-scale application in the run and can be in existing continuous coating systems, eg. As electrolytic galvanizing or fire coating systems integrate. In this case, good processing results occur when the deposition rate the hollow cathode glow discharge is 10 to 1000 nm / s.
  • the coating result can be improved by setting the deposition rate of the hollow cathode glow discharge at 20-750 nm / s, whereby an optimum state of the plasma polymer layer is achieved when the deposition rate of the hollow cathode glow discharge is 50-500 nm / s, especially 50-500 nm / s. 360 nm / s, amounts.
  • the inventively after application of the metallic layers of the Uberzugssystems performed heat treatment is preferably carried out at temperatures which are below 500 0 C.
  • the heat treatment performed to form the alloy between the first and second metallic layers may be applied before or after application of the plasma polymer layer. Regardless of when it is carried out, it ensures a good bonding of the layer and, as a result, a good corrosion protection effect combined with excellent laser weldability.
  • the inventive method differs from those known from the prior art, in which the metallic layer system by means of deposition by thermal evaporation in a vacuum finely structured magnesium layer with a thickness of 100 ... 2000 nm, in particular 100-1000 nm, is produced on a zinc coating deposited by means of electrolytic galvanizing or hot-dip galvanizing or vacuum vapor deposition and subsequent thermal treatment, characterized in that the alloying process before or after deposition of the Plasma polymer layer is carried out by thermal aftertreatment.
  • a deep-drawn steel strip comprises a base layer made, for example, of a low-alloy steel, onto which a thin multi-layer corrosion protection system is applied.
  • the corrosion protection system is characterized by a zinc coating applied to the base layer as a first metallic layer, the thickness of which is approximately 3.4 ⁇ m, a second metallic layer in the form of a Zn-Mg alloy coating applied to the first metallic layer, whose thickness is less than 1 ⁇ m is so that the metallic layers together are less than 3.5 microns thick, and formed a 340 nm thick plasma polymer layer.
  • the thickness of the Plasma polymer layer was varied. Thus, plasma polymer layers having a thickness of 340 nm and 520 nm were deposited.
  • the corrosion protection system constructed in this way ensures corrosion stability in a 340 nm thick plasma polymer layer in flange samples made of the steel strip and designed according to SEP 1160 of at least 10 cycles in the corrosion change test according to VDA Test Sheet 621-415 without red rust.
  • SEP 1160 of at least 10 cycles in the corrosion change test according to VDA Test Sheet 621-415 without red rust.
  • more than> 80-100% red rust was present at this time.
  • a zinc layer has been first deposited on the IF steel substrate forming the base layer by means of electrolytic galvanizing. Subsequently, a finely structured magnesium layer has been applied to the zinc layer by thermal vapor deposition in vacuo. Upon subsequent thermal treatment, a Zn-Mg alloy coating was obtained at 310 ° C. and finally a plasma polymer layer was deposited by hollow cathode glow discharge using tetramethylsilane at a deposition rate of 34 nm / s. The steel sheet obtained in this way exhibited excellent corrosion protection combined with very good laser weldability.
  • a Zn coating has been deposited as the first metallic layer by means of electrolytic galvanizing in a first step on the base layer.
  • a fine-patterned magnesium layer as the second metallic layer on the first metallic layer and a plasma polymer layer were deposited on the second metallic layer by means of hollow-cathode glow discharge using tetramethylsilane at a deposition rate of 34 nm / sec. Only after the application of the plasma polymer layer on the second metallic layer was a thermal treatment of 10 s at 335 0 C then carried out to form the Zn-Mg alloy coating.
  • the steel sheet obtained in this way also exhibited excellent corrosion protection combined with very good laser weldability.
  • the corrosion coating can be produced without interruption in a vacuum in an "inline process sequence", so that the production costs are reduced and the process management is simplified as a whole.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
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EP07729270A 2006-05-18 2007-05-18 Mit einem korrosionsschutzsystem versehenes stahlblech und verfahren zum beschichten eines stahlblechs mit einem solchen korrosionsschutzsystem Withdrawn EP2021132A1 (de)

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DE102006023230 2006-05-18
DE102006047060A DE102006047060A1 (de) 2006-05-18 2006-10-04 Mit einem Korrosionsschutzsystem versehenes Stahlblech und Verfahren zum Beschichten eines Stahlblechs mit einem solchen Korrosionsschutzsystem
PCT/EP2007/054825 WO2007135092A1 (de) 2006-05-18 2007-05-18 Mit einem korrosionsschutzsystem versehenes stahlblech und verfahren zum beschichten eines stahlblechs mit einem solchen korrosionsschutzsystem

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US20100003538A1 (en) 2010-01-07
US20120121927A1 (en) 2012-05-17
DE102006047060A1 (de) 2007-11-22
MX2008014074A (es) 2008-11-14
AU2007253347A1 (en) 2007-11-29
CA2652403A1 (en) 2007-11-29
JP2009537699A (ja) 2009-10-29
RU2429084C2 (ru) 2011-09-20
RU2008149952A (ru) 2010-06-27
BRPI0711649A2 (pt) 2011-11-29
WO2007135092A1 (de) 2007-11-29

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