EP1857567B1 - Procédé de fabrication d'un produit d'acier plat revêtu avec un système de protection contre la corrosion - Google Patents

Procédé de fabrication d'un produit d'acier plat revêtu avec un système de protection contre la corrosion Download PDF

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Publication number
EP1857567B1
EP1857567B1 EP06113963.0A EP06113963A EP1857567B1 EP 1857567 B1 EP1857567 B1 EP 1857567B1 EP 06113963 A EP06113963 A EP 06113963A EP 1857567 B1 EP1857567 B1 EP 1857567B1
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EP
European Patent Office
Prior art keywords
coating
steel substrate
layer
steel
zinc
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.)
Not-in-force
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EP06113963.0A
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German (de)
English (en)
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EP1857567A1 (fr
Inventor
Carmen Dr. Ostwald
Manfred Meurer
Oliver Bendick
Michael Keller
Erich Dr. Nabbefeld-Arnold
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ThyssenKrupp Steel Europe AG
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ThyssenKrupp Steel Europe AG
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Publication date
Priority to ES06113963.0T priority Critical patent/ES2629109T3/es
Application filed by ThyssenKrupp Steel Europe AG filed Critical ThyssenKrupp Steel Europe AG
Priority to US12/300,966 priority patent/US20100055344A1/en
Priority to EP06113963.0A priority patent/EP1857567B1/fr
Priority to PL06113963T priority patent/PL1857567T3/pl
Priority to KR1020087027956A priority patent/KR101154534B1/ko
Priority to CA2650719A priority patent/CA2650719C/fr
Priority to JP2009510445A priority patent/JP5112422B2/ja
Priority to AU2007251551A priority patent/AU2007251551B2/en
Priority to CN2007800176384A priority patent/CN101454474B/zh
Priority to PCT/EP2007/054712 priority patent/WO2007132008A1/fr
Priority to BRPI0711621-7A priority patent/BRPI0711621B1/pt
Publication of EP1857567A1 publication Critical patent/EP1857567A1/fr
Application granted granted Critical
Publication of EP1857567B1 publication Critical patent/EP1857567B1/fr
Anticipated expiration legal-status Critical
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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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B1/00—Cleaning by methods involving the use of tools
    • B08B1/10—Cleaning by methods involving the use of tools characterised by the type of cleaning tool
    • B08B1/16—Rigid blades, e.g. scrapers; Flexible blades, e.g. wipers
    • B08B1/165—Scrapers
    • 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
    • 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
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0224—Two or more thermal pretreatments
    • 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
    • C23C2/29—Cooling or quenching
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
    • C23G1/20—Other heavy metals

Definitions

  • the invention relates to a method for producing a steel flat product coated with a corrosion protection system, in which a zinc-based coating is applied to a steel substrate, such as steel strip or sheet, by means of hot-dip coating and an organic coating is applied to the zinc-based coating.
  • metallic coatings are applied, in particular on steel sheets or strips, which are based on zinc or zinc alloys in the majority of applications.
  • Such zinc or zinc alloy coatings protect due to their barrier and cathodic protection effect the corresponding coated steel sheet in practical use against corrosion.
  • the corrosion resistance of zinc-coated sheets can be further improved by application of organic coatings, which in practice are generally multi-layer coating systems.
  • a method of coating for example, steel sheets provided with a zinc coating with one Paint system is in the WO 98/24857 described.
  • the substrate surface is first cleaned.
  • an inorganic and / or organic pretreatment agent is applied to the coating.
  • a so-called "primer” serving as an adhesion promoter is then applied to the coating layer prepared in this way, onto which in turn one of an amine-modified epoxy resin and a crosslinking agent-containing coating material is applied by spraying, dipping, knife coating, rolling or brushing.
  • the coated substrates should therefore have a good and uniform surface quality and are characterized by good formability, durability, resistance to chemical substances, corrosion and weathering resistance.
  • the object of the invention was to provide a method which allows an economical production of highly corrosion-resistant and at the same time readily processable flat steel products.
  • a steel substrate present in the form of a steel sheet or strip is subjected to a coating process, the steps of which are preferably completed in continuous operation with regard to the economic efficiency of its large-scale implementation.
  • the throughput speeds set in practice can be in the range from 60 to 150 m / min, depending on the respective performance and the time required for the respective processing step.
  • the steel substrate is first preheated.
  • DFF Direct Fired Furnace
  • RTF Radiant Tube Furnace
  • the maximum band temperature achieved is set to 720 ° C. to 850 ° C., depending on the steel grade.
  • the steel substrate runs under exclusion of air in a zinc bath. This can be done in a conventional manner, for example by a with the Inside the annealing furnace connected and with its opening into the melt bath dipping proboscis into which the melt bath are led.
  • the melt bath consists of a melt which, in addition to zinc and the usual manufacturing-related impurities, has magnesium and aluminum contents.
  • the composition of the melt is chosen so that forms a Zn-Mg-Al-Fe-containing metallic corrosion protection coating on the steel substrate. This has due to the distribution of the alloying elements contained in it on the one hand optimal adhesion to the steel substrate and on the other hand, a surface finish, which is suitable for a direct application of an organic coating without complex pretreatment. At the same time, the coating has excellent weldability, which makes flat steel products according to the invention particularly suitable for spot welding.
  • the layer structure of the coating can be formed so that in its immediately adjacent to the surface surface boundary layer whose thickness is limited to max. 10% of the total thickness of the coating is limited, the elements Mg and Al are initially present enriched as an oxide. In addition, Zn oxide is present on the surface. The amount of Al enrichment on the immediate surface is at most about 1 wt%.
  • the oxide layer forming on the zinc alloy coating passivates the surface and allows a direct paint connection.
  • the operating parameters of the zinc dip coating according to the invention are preferably adjusted so that the thickness of the surface boundary layer is less than 5%, in particular less than 1%, of the total thickness of the metallic coating.
  • the surface boundary layer is followed, to a thickness of at least 25% of the total overlay of the coating, by an intermediate layer having Al contents of not more than 0.25% by weight.
  • the Al content rises to 4.5% at the boundary to the steel substrate.
  • the Mg enrichment on the immediate surface of the coating is significantly greater than the Al enrichment. Mg contents of up to 10% are achieved here.
  • the amount of Mg decreases over the intermediate layer and is 0.5 to 2% at a depth of about 25% of the total overlay thickness of the overlay.
  • An increase of the Mg content in the direction of the steel substrate then takes place via the boundary layer. At the border to the steel substrate, the Mg content is up to 3.5%.
  • the low Al content in the intermediate layer ensures a particularly good weldability and a uniform surface formation, while the alloy alloyed into the boundary layer ensures the particularly good adhesion of the coating to the steel substrate.
  • the especially good even with low coating thicknesses Anti-corrosive effect of the coating is guaranteed by the high levels of Mg and Al in the boundary layer.
  • the information on the structure of the corrosion-coating layer and its individual layers contained herein and in the claims relates to a layer profile determined by a GDOS measurement (glow discharge optical emission spectrometry).
  • a GDOS measurement low discharge optical emission spectrometry
  • Hubert Gräfen, VDI-Verlag GmbH, Dusseldorf, 1993 is a standard method for rapidly detecting a concentration profile of coatings.
  • the above enumerated properties of a metallic anticorrosive coating produced according to the invention are particularly certain in that, according to the invention, the Al content of the melt bath is 0.15-0.4% by weight. It has been found that with such a relatively low Al contents of a melt bath used for carrying out the method according to the invention, the expression of the desired layer structure according to the invention can be directly influenced by a suitable adjustment of the tape immersion and / or bath temperature.
  • the process according to the invention during hot dip coating ensures that high Al and Mg contents accumulate in the boundary layer of the metallic corrosion protection coating adjacent to the steel substrate, while in particular low Al contents are present in the intermediate layer.
  • the difference between the temperature of the strip during immersion and the temperature of the melt bath comes one special importance.
  • the inventively minimized presence of Al in the intermediate layer can be set safely and selectively.
  • the Mg content of the melt bath can be limited to 0.2-2.0% by weight, in particular 0.5-1.5% by weight.
  • Elements from the group Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn and rare earths can be obtained in a corrosion protection coating produced according to the invention up to a total of their contents of 0.8% by weight. be present in the coating according to the invention.
  • Pb, Bi and Cd can be used to form a larger crystal structure (zinc flower), Ti, B, Si to improve the formability, Cu, Ni, Co, Cr, Mn to influence the boundary layer reactions, Sn for influencing the surface oxidation and rare earths, in particular Lanthanum and cerium, can be added to improve the flow behavior of the melt.
  • the impurities which may be present in a corrosion protection coating according to the invention also include the constituents which, as a result of the hot-dip coating, enter the coating from the steel substrate in quantities which do not affect the properties of the coating.
  • the coating thickness of the coating is set to 3 - 20 .mu.m , which a pad weight of the metallic corrosion protection coating of 20 - 140 g / m 2 each Page corresponds.
  • the excellent corrosion protection effect of coatings formed according to the invention makes it possible to limit the thickness of the coating to values of 4 to 12 ⁇ m , which corresponds to a coating weight of 30 to 85 g / m 2 per side. With such thin coatings coated steel substrates can be particularly well processed.
  • the stripping of superfluous coating material carried out to adjust the coating thickness can be carried out, for example, in a manner known per se by means of gas jets ejected from a nozzle scraper system.
  • nitrogen is preferably used as the gas for the gas jets in order to largely suppress oxidation of the surface of the coating.
  • the steel strip now provided with the zinc-based, Mg- and Al-containing metallic corrosion protection coating has been led out of the zinc bath, it is purposefully cooled.
  • the final temperature reached corresponds typically to the room temperature.
  • the steel substrate provided with the metallic anticorrosion coating can be subjected to a skin pass rolling in order to obtain a texturizing of its surface which is optimally suitable for the subsequent coating.
  • Both the controlled cooling and optionally carried out temper rolling are carried out in view of the economy and the output preferably in a line and in continuous flow with the galvanizing process.
  • the steel substrate coated in accordance with the invention is organically coated. This can be done in a separate coil coating plant or also be carried out inline directly after cooling or, if necessary, additionally performed skin-pass. A procedure that is continuous with the preceding step is also favorable here, because then the coating can be applied with particularly good results of work directly on the freshly produced metallic surface. In particular, in the case of an organic coating following in line with the respective previous working step, it is avoided that the metallic coating is altered by aging, lubrication or degreasing.
  • the organic coating may discontinuously in a manner known per se via a separate coil coating system.
  • the steel substrate provided with the coating may first be oiled after the galvanizing, the cooling or the rolling, in order to ensure a temporary corrosion protection.
  • Another variant is a "sealing" of the steel substrate and galvanizing.
  • a layer of polyacrylate or polyester up to about 2 .mu.m thick is applied as a simple corrosion protection and further processing aid, which may, inter alia, be made thermally or UV-curing.
  • a “mild cleaning” is understood to mean a cleaning in which the surface of the metallic anticorrosive coating is mixed with a mildly alkaline cleaning agent (pH 9-10, free alkalinity up to 14) or a strongly alkaline one (pH 12-12 5, free alkalinity 5), but with a low concentration of detergent.
  • a mildly alkaline cleaning agent pH 9-10, free alkalinity up to 14
  • a strongly alkaline one pH 12-12 5, free alkalinity 5
  • Detergents suitable for this purpose are, for example, liquids based on phosphate-containing potassium or sodium hydroxide solutions whose temperature is typically in the range from 40 to 70.degree.
  • a pre-treatment can be applied to the strip surface by means of spraying, dipping or with the aid of a roll coater, which passivates the metallic surface and ensures adhesion between the metal coating and the lacquer.
  • This pretreatment is preferably a Cr VI -free system, preferably a completely Cr-free system which is produced, for example, based on Ti, Zr, P and / or Si. Because the native oxide layers deposited on the coated steel substrate set, already ensure a very good passivation of the surface, however, can be completely dispensed with in many practical applications such a pretreatment and applied the paint directly on the possibly only degreased metallic substrate.
  • the curing of the coating by means of heat or radiation.
  • hardening by radiation in particular UV radiation
  • thermal post-combustion of released solvents can be dispensed with.
  • a plant for UV curing can be realized on a length that is significantly shorter than the length that must be provided for a required for thermal drying convection oven.
  • the procedure of the invention using Cr VI- free pretreatment agents achieves corrosion protection properties at least as good as those of products pretreated with Cr VI- containing agents according to the prior art.
  • Diag. 1 and 2 Two possible in the context of the invention sequences of the individual steps of the method according to the invention are in Diag. 1 and 2 are shown by way of example.
  • the respective steel substrate (steel sheet or strip) is first preheated, then hot-dip galvanized and after an adjustment of the thickness of the metallic coating produced on the substrate nach rolled up to form an optimized surface structure with low degrees of deformation.
  • an organic coating system formed from a primer and a lacquer is either applied directly to the metallic anti-corrosion coating without intermediate cleaning and pretreatment, or applied to the metallic anti-corrosion coating only after a subsequent post-rolling cleaning and optionally pretreatment.
  • the thickness of the superficial oxidation surface boundary layer is max. 0.2 ⁇ m and is based on the determined in a GDOS measurement layer profile in each case in the range of up to 2.7% of the total overlay thicknesses.
  • the amount of Al enrichment on the immediate surface is at most about 1 wt .-%. This is followed up to a thickness of at least 25% of the total overlay of the coating, the intermediate layer with a low Al content of maximum 0.25 wt .-% of. In the boundary layer, the Al content rises to 4.5% at the boundary to the steel substrate.
  • the Mg enrichment on the immediate surface of the coating is significantly greater than the Al enrichment. Mg contents of up to 20% are achieved here.
  • the amount of Mg decreases over the intermediate layer and is 0.5 to 2% at a depth of about 25% of the total overlay thickness of the overlay.
  • An increase of the Mg content in the direction of the steel substrate then takes place via the boundary layer. At the border to the steel substrate, the Mg content is up to 3.5%.
  • the about 2.5 ⁇ m thick intermediate layer to the surface boundary layer includes, whose Al content is below 0.2%, respectively.
  • the thickness of the intermediate layer is therefore approximately 36% of the total overlay thickness of the respective anti-corrosion coating of 7 ⁇ m .
  • the intermediate layer merges into a boundary layer adjacent to the steel substrate, in which the contents of Al, Mg and Fe have increased significantly compared with the corresponding contents of the intermediate layer.
  • Fig. 1 does not show to scale a section of a produced and obtained in accordance with the invention and flat steel flat product in cross section. Accordingly, S initially an about 7.5 ⁇ m thick metallic corrosion protection coating K applied to the exterior in use, the corrosive attack particularly exposed to side A of a present as a steel sheet steel substrate, which consists essentially of Zn, Al, Mg and Fe.
  • a primer layer P On the surface of the corrosion protection coating K is directly, ie without further pretreatment, a primer layer P applied.
  • the layer thickness of the primer layer P is 5 ⁇ m in conventional primer products. Be so-called "thick-layer primer” used the thickness of the primer layer P may be up to 20 ⁇ m.
  • a lacquer layer L has been applied, whose thickness is about 20 ⁇ m.
  • the primer layer P can be previously pretreated by means of UV rays.
  • a topcoat D is applied, which is up to 17 .mu.m thick.
  • the primer layer P, the lacquer layer L and the topcoat D together form an organic coating which, in spite of the omission of a pretreatment of the surface of the anticorrosive coating K, together with the metallic anticorrosive coating K, protects the steel substrate S particularly well against corrosion.
  • an approximately 7.5 ⁇ m thick metallic corrosion protection coating Ki is also initially applied, substantially consisting of Zn, Al, Mg and Fe.
  • a paint layer Li is applied, whose thickness is 5 - 10 microns .
  • Fig. 2 does not show to scale a section of a second in accordance with the invention produced and procured, also for use in the field of vehicle construction particularly suitable steel flat product in cross section. Accordingly, on the outside in use, the corrosive attack is particularly strong exposed side of the present as a steel sheet steel substrate S is first applied an approximately 5 ⁇ m thick metallic corrosion protection coating K, which consists essentially of Zn, Al, Mg and Fe.
  • the surface of the anticorrosive coating K has first of all been subjected to a pretreatment in which a thin pretreatment layer V has remained on the anticorrosive coating K.
  • a V about 8 ⁇ m thick primer layer P1 is applied.
  • the primer layer P1 carries an approximately 5 ⁇ m thick adhesive layer E, via the one laid on the adhesive layer E, about 52 ⁇ m thick laminated film F is adhered to the primer layer P1.
  • a further primer layer P2 is applied, in turn, an approximately 20 ⁇ m thick topcoat carries D.
  • the top coat layer D forms the outer finish of the organic coating system formed from the primer layer P1, the adhesive layer E, the composite film F, the primer layer P2 and the topcoat layer D.
  • an approximately 5 ⁇ m thick metallic corrosion protection coating Ki is also initially applied, which consists essentially of Zn, Al, Mg and Fe.
  • the surface of the anti-corrosion coating Ki has been pretreated in this case to form a thin pretreatment layer Vi first.
  • a lacquer layer has been applied, which is typically 5 ⁇ m thick.
  • Fig. 3 does not show to scale a section of a third in accordance with the invention produced and created, for general building exterior applications particularly suitable flat steel product in cross section. Accordingly, S is first applied an approximately 10 ⁇ m thick metallic corrosion protection coating K to the external in use, the corrosive attack particularly exposed side of the present as a steel sheet steel substrate, consisting essentially of Zn, Al, Mg and Fe. The surface of the anticorrosive coating K has also been subjected to a pretreatment in this case, in which a thin pretreatment layer V has remained on the anticorrosive coating K.
  • an approximately 5 ⁇ m thick primer layer P is applied, which in turn carries an approximately 20 ⁇ m thick topcoat layer D.
  • the topcoat D itself carries on its outer side a peelable protective film U, which protects the flat steel product during its transport and storage.
  • the protective film U can also be listed as a permanently adhering film to improve the surface properties.
  • an approximately 10 ⁇ m thick metallic corrosion protection coating Ki is also initially applied, the substantially Zn, Al, Mg and Fe.
  • the surface of the anticorrosion coating Ki has also been pretreated in this case to form a thin pretreatment layer V first.
  • a resist layer Li has been applied, which is typically 7-15 ⁇ m thick.
  • Fig. 4 does not show to scale a section of a fourth produced in accordance with the invention and procured, in particular suitable for home appliance steel flat product in cross section. Accordingly, first an about 4 on the exterior in use, the corrosive attack particularly exposed side of a present as a steel sheet steel substrate S - applied 5 ⁇ m thick metallic corrosion protection coating K, consisting essentially of Zn, Al, Mg and Fe.
  • an approximately 8 ⁇ m thick primer layer P On the surface of the anticorrosive coating K is immediate, that is applied, without further pretreatment, an approximately 8 ⁇ m thick primer layer P.
  • a so-called “structure primer” has been used here, which forms a structured, elevations and depressions having surface.
  • a lacquer layer L has been applied, whose thickness is about 20 ⁇ m.
  • a permanently adhering protective layer can be applied to the lacquer layer, which is used inter alia to improve the surface properties.
  • less corrosive attacked side of the steel substrate S is also initially an approximately 4 - 5 ⁇ m thick metallic corrosion protective coating applied Ki, which consists essentially of Zn, Al, Mg and Fe.
  • Ki metallic corrosion protective coating
  • a lacquer layer is applied directly Li, the thickness of 7 - is 10 ⁇ m.

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  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (13)

  1. Procédé de production d'un produit plat en acier recouvert d'un système anti-corrosif, lors duquel l'on applique sur un substrat en acier, tel qu'une bande ou une tôle en acier, un revêtement à base de zinc en l'enduisant par immersion dans un bain de matière fondue et lors duquel l'on applique un revêtement organique sur le revêtement à base de zinc, ce procédé comprenant les étapes de travail suivantes :
    - préchauffer le substrat en acier dans un four de préchauffage à une température de bande de 720 - 850 °C sous une atmosphère de gaz protecteur ;
    - refroidir le substrat en acier à une température initiale de bande,
    - enduire le substrat en acier sous vide par immersion dans un bain en matière fondue à base de zinc, ce dernier contenant (en % en poids), outre du zinc et des impuretés inévitables, 0,15 - 0,4 % de Al, 0,2 - 3 % de Mg ainsi que, au choix, au total jusqu'à 0,8 % d'un ou plusieurs éléments parmi le groupe se composant de « Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn ainsi que terre rare » et dont la température du bain se monte à 420 - 500 °C,
    - auquel cas la différence « BET-BT » entre la température initiale de bande « BET » et la température du bain « BT » varie dans une plage de - 10 °C à +70 °C de telle sorte à former sur le substrat en acier un revêtement métallique anti-corrosif à base de Zn-Mg-Al-Fe, lequel contient (en % en poids) 0,25 - 2,5 % de Mg, 0,2 - 3,0 de Al, ≤ 4,0 % de Fe, ainsi que, au choix, au total jusqu'à 0,8 % d'un ou plusieurs éléments parmi le groupe se composant de « Pb, Bi, Cd, Ti, B, Si, Cu, Ni, Co, Cr, Mn, Sn ainsi que terre rare », le reste étant du zinc et des impuretés inévitables, et qui présente, dans une couche intermédiaire qui s'étend entre une couche superficielle immédiatement adjacente à la surface du produit plat en acier et une couche limite adjacente au substrat en acier et dont l'épaisseur se monte à au moins 20 % de l'épaisseur totale du revêtement anti-corrosif, une teneur en Al au maximum de 0,5 % en poids,
    - ajuster l'épaisseur du revêtement métallique anti-corrosif appliqué sur le substrat en acier dans le bain de matière fondue à une valeur comprise entre 4 et 12 µm
    - correspondant à poids d'application de 30 - 85 g/m2
    - par côté par élimination du matériau de revêtement en excédent,
    - refroidir le substrat en acier muni du revêtement métallique anti-corrosif et
    - appliquer le revêtement organique sur le revêtement métallique anti-corrosif du substrat en acier.
  2. Procédé selon la revendication 1, caractérisé en ce que les étapes de travail sont effectuées en un passage continu.
  3. Procédé selon la revendication 2, caractérisé en ce que la vitesse avec laquelle le substrat en acier effectue les étapes de travail se situe dans une fourchette allant de 60 - 150 m/min.
  4. Procédé selon une des revendications précédentes, caractérisé en ce que la teneur de Mg du bain de matière fondue à base de zinc se monte à 0,2 - 2,0 % en poids.
  5. Procédé selon une des revendications précédentes, caractérisé en ce que la teneur en Mg du bain de matière fondue à base de zinc se monte à 0,5 - 1,5 % en poids.
  6. Procédé selon une des revendications précédentes, caractérisé en ce que l'élimination du matériau de revêtement en excédent pour le réglage de l'épaisseur du revêtement à base de Zn-Mg-Al-Fe a lieu à l'aide de jets de gaz.
  7. Procédé selon la revendication 6, caractérisé en ce que l'on utilise de l'azote en tant que gaz pour les jets de gaz.
  8. Procédé selon une des revendications précédentes, caractérisé en ce que le substrat en acier muni d'un revêtement à base de Zn-Mg-Al-Fe est soumis à un laminage de dressage.
  9. Procédé selon une des revendications précédentes, caractérisé en ce que le revêtement organique est appliqué directement sur la surface n'ayant pas été nettoyée ou prétraitée auparavant du revêtement à base de Zn-Mg-Al-Fe appliqué sur le substrat en acier.
  10. Procédé selon une des revendications de 1 à 8, caractérisé en ce que la surface du revêtement à base de Zn-Mg-Al-Fe appliqué sur le substrat en acier est nettoyée avant l'application du revêtement organique.
  11. Procédé selon une des revendications de 1 à 8 ou 10, caractérisé en ce qu'avant l'application du revêtement organique l'on procède à un traitement préalable chimique de la surface du revêtement à base de Zn-Mg-Al-Fe appliqué sur le substrat en acier avec un agent de prétraitement exempt de CrVI.
  12. Procédé selon la revendication 11, caractérisé en ce que l'agent de prétraitement est exempt de Cr.
  13. Procédé selon une des revendications précédentes, caractérisé en ce que le revêtement organique est endurci à l'aide de rayons UV.
EP06113963.0A 2006-05-15 2006-05-15 Procédé de fabrication d'un produit d'acier plat revêtu avec un système de protection contre la corrosion Not-in-force EP1857567B1 (fr)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US12/300,966 US20100055344A1 (en) 2006-05-15 2006-05-15 Process for Producing a Sheet Steel Product Coated with an Anticorrosion System
EP06113963.0A EP1857567B1 (fr) 2006-05-15 2006-05-15 Procédé de fabrication d'un produit d'acier plat revêtu avec un système de protection contre la corrosion
PL06113963T PL1857567T3 (pl) 2006-05-15 2006-05-15 Sposób wytwarzania płaskiego produktu stalowego powleczonego ochronnym systemem przeciwkorozyjnym
ES06113963.0T ES2629109T3 (es) 2006-05-15 2006-05-15 Procedimiento para la fabricación de un producto plano de acero revestido con un sistema de protección frente a la corrosión
CA2650719A CA2650719C (fr) 2006-05-15 2007-05-15 Procede de fabrication d'un produit plat en acier recouvert d'un systeme anti-corrosif
JP2009510445A JP5112422B2 (ja) 2006-05-15 2007-05-15 防食システムによりコーティングされるフラット鋼生成物の製造方法
KR1020087027956A KR101154534B1 (ko) 2006-05-15 2007-05-15 부식 방지 시스템으로 코팅된 평판형 강재 제품의 제조 방법
AU2007251551A AU2007251551B2 (en) 2006-05-15 2007-05-15 Process for producing a sheet steel product coated with an anticorrosion system
CN2007800176384A CN101454474B (zh) 2006-05-15 2007-05-15 制备覆有防腐蚀体系的扁钢产品的方法
PCT/EP2007/054712 WO2007132008A1 (fr) 2006-05-15 2007-05-15 Procédé de fabrication d'un produit plat en acier recouvert d'un système anti-corrosif
BRPI0711621-7A BRPI0711621B1 (pt) 2006-05-15 2007-05-15 Método para produção de um produto do aço plano revestido com um sistema de proteção à corrosão

Applications Claiming Priority (1)

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EP06113963.0A EP1857567B1 (fr) 2006-05-15 2006-05-15 Procédé de fabrication d'un produit d'acier plat revêtu avec un système de protection contre la corrosion

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EP1857567A1 EP1857567A1 (fr) 2007-11-21
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AU (1) AU2007251551B2 (fr)
BR (1) BRPI0711621B1 (fr)
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KR101767788B1 (ko) 2015-12-24 2017-08-14 주식회사 포스코 내마찰성 및 내백청성이 우수한 도금 강재 및 그 제조방법
EP3548641B1 (fr) 2016-11-29 2020-08-26 Tata Steel IJmuiden B.V. Procédé de fabrication d'un article formé à chaud et article ainsi obtenu
DE102017211076B4 (de) * 2017-06-29 2019-03-14 Thyssenkrupp Ag Verfahren zum Herstellen eines mit einem Überzug versehenen Stahlbauteils und Stahlbauteil
DE102018132171A1 (de) * 2018-12-13 2020-06-18 Thyssenkrupp Steel Europe Ag Batteriegehäuse und Verwendung
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DE102020200326A1 (de) * 2020-01-13 2021-07-15 Thyssenkrupp Steel Europe Ag Verfahren zur Herstellung eines oberflächenveredelten und oberflächenkonditionierten Stahlblechs
KR102360526B1 (ko) * 2020-05-27 2022-02-09 포스코강판 주식회사 내공식성이 우수한 도금강판 및 그 제조방법
WO2022149511A1 (fr) 2021-01-08 2022-07-14 日本製鉄株式会社 Joint soudé et composant d'automobile
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CN114107736A (zh) * 2021-11-30 2022-03-01 攀钢集团攀枝花钢铁研究院有限公司 含v、b的锌铝镁合金镀层钢材及其制备方法
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JP2009537698A (ja) 2009-10-29
KR20080109935A (ko) 2008-12-17
ES2629109T3 (es) 2017-08-07
PL1857567T3 (pl) 2017-09-29
CN101454474A (zh) 2009-06-10
EP1857567A1 (fr) 2007-11-21
CN101454474B (zh) 2012-06-20
AU2007251551B2 (en) 2011-08-11
JP5112422B2 (ja) 2013-01-09
BRPI0711621A2 (pt) 2011-12-06
BRPI0711621B1 (pt) 2020-09-15
WO2007132008A1 (fr) 2007-11-22
CA2650719A1 (fr) 2007-11-22
CA2650719C (fr) 2011-11-15
AU2007251551A1 (en) 2007-11-22
US20100055344A1 (en) 2010-03-04
KR101154534B1 (ko) 2012-06-13

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