CA2622817A1 - Method for producing a sheet steel product protected against corrosion - Google Patents
Method for producing a sheet steel product protected against corrosion Download PDFInfo
- Publication number
- CA2622817A1 CA2622817A1 CA002622817A CA2622817A CA2622817A1 CA 2622817 A1 CA2622817 A1 CA 2622817A1 CA 002622817 A CA002622817 A CA 002622817A CA 2622817 A CA2622817 A CA 2622817A CA 2622817 A1 CA2622817 A1 CA 2622817A1
- Authority
- CA
- Canada
- Prior art keywords
- zinc
- steel product
- coating
- flat steel
- magnesium
- 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.)
- Abandoned
Links
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 230000007797 corrosion Effects 0.000 title claims abstract description 13
- 238000005260 corrosion Methods 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 238000000576 coating method Methods 0.000 claims abstract description 57
- 239000011248 coating agent Substances 0.000 claims abstract description 49
- 239000011701 zinc Substances 0.000 claims abstract description 41
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 40
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 29
- 239000011777 magnesium Substances 0.000 claims abstract description 29
- 238000004140 cleaning Methods 0.000 claims abstract description 17
- 238000009792 diffusion process Methods 0.000 claims abstract description 6
- 239000012298 atmosphere Substances 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 41
- 238000010438 heat treatment Methods 0.000 claims description 24
- 238000005246 galvanizing Methods 0.000 claims description 13
- 238000000151 deposition Methods 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- 238000005554 pickling Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000002253 acid Substances 0.000 claims description 3
- 230000001143 conditioned effect Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000003750 conditioning effect Effects 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims 1
- 239000010410 layer Substances 0.000 abstract description 36
- 239000011247 coating layer Substances 0.000 abstract 1
- 230000001747 exhibiting effect Effects 0.000 abstract 1
- 238000001947 vapour-phase growth Methods 0.000 abstract 1
- 238000005240 physical vapour deposition Methods 0.000 description 18
- 239000000853 adhesive Substances 0.000 description 15
- 230000001070 adhesive effect Effects 0.000 description 15
- 239000000758 substrate Substances 0.000 description 14
- 238000007747 plating Methods 0.000 description 7
- 229910001335 Galvanized steel Inorganic materials 0.000 description 6
- 239000011324 bead Substances 0.000 description 6
- 239000008397 galvanized steel Substances 0.000 description 6
- 229910000861 Mg alloy Inorganic materials 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910001297 Zn alloy Inorganic materials 0.000 description 2
- PGTXKIZLOWULDJ-UHFFFAOYSA-N [Mg].[Zn] Chemical compound [Mg].[Zn] PGTXKIZLOWULDJ-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 238000002203 pretreatment Methods 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910009369 Zn Mg Inorganic materials 0.000 description 1
- 229910007573 Zn-Mg Inorganic materials 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000004210 cathodic protection Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- JNGZXGGOCLZBFB-IVCQMTBJSA-N compound E Chemical compound N([C@@H](C)C(=O)N[C@@H]1C(N(C)C2=CC=CC=C2C(C=2C=CC=CC=2)=N1)=O)C(=O)CC1=CC(F)=CC(F)=C1 JNGZXGGOCLZBFB-IVCQMTBJSA-N 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000000445 field-emission scanning electron microscopy Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000010849 ion bombardment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000009832 plasma treatment Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000001771 vacuum deposition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000007704 wet chemistry method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F17/00—Multi-step processes for surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by subclass C21D or C22F or class C25
-
- 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
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/10—Other heavy metals
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Coating With Molten Metal (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Physical Vapour Deposition (AREA)
- Electroplating Methods And Accessories (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Laminated Bodies (AREA)
Abstract
The invention relates to a cost-saving production of steel sheets protected against corrosion and exhibiting good use-related properties for determined applications. For this purpose, the inventive method for producing a sheet steel product protected against corrosion consists in electrolytically applying a coating zinc-containing layer to the sheet steel product, if necessary, in mechanically and/or chemically cleaning said product, in immediately applying a second magnesium-based coating layer to the cleaned coating zinc-containing layer by vapour-phase deposition and, after applying said second layer, in subsequently heat-treating the coated sheet steel product at a normal atmosphere and a processing temperature ranging from 320 to 335 ~C in such a way that a diffusion or convection layer is formed between the coating zinc-containing and magnesium-based layers.
Description
SI/cs 051196W0 22 September 2006 PROCESS TO MANUFACTURE A CORROSION-RESISTANT FLAT STEEL
PRODUCT
The invention relates to a process for manufacturing corrosion-resistant flat steel products, which are provided at least with a first zinc-containing coating, and a second coating lying thereon, which is based on pure magnesium or a magnesium alloy. Such processes are used for example to produce sheet steel, which due to its optimised corrosion resistance is particularly suitable for use in the construction, domestic appliance or motor vehicle industries.
Coatings, which in the predominant number of applications, consist of zinc or zinc alloys are applied to sheet steel in order to improve its corrosion resistance. Such zinc or zinc alloy coatings, due to their barrier and cathodic protection effect, ensure very good corrosion resistance of the coated sheet steel. However despite the quality already achieved up till now, higher and higher requirements in the corrosion resistance and general characteristics of coated sheet steel are demanded by the processors.
At the same time apart from the heavy cost pressure there is a need for better workability of coated sheet steel. In particular surface qualities optimised in relation to the respective intended purpose are demanded.
These demands in practice cannot be met alone by increasing the coating thickness, since on the one hand this is countermanded by economic and ecological reasons and on the other hand increasing the coating thickness involves a general degradation in the formability of sheet steel galvanized in this way.
Galvanized sheet steel is usually converted to consumer articles by forming, joining, organic coating (for example painting) or similar processes. Particularly in the field of motor vehicle body construction the bonding together of preformed steel parts is gaining acceptance. A further important factor is the formability of the coatings, that is to say their ability to withstand even greater transforming stresses, as they occur for example in the case of deep-drawing, without serious damage. None of these demands can be met to the same degree with conventional pure-galvanized products. Rather, conventionally coated sheet steel usually has particularly good characteristics as regards a certain requirement feature, while shortcomings must be accepted as regards other requirement features.
Thus for example hot-dip galvanized sheet steel is characterised by high corrosion resistance in both the unpainted as well as in the painted state. Although electro-galvanized sheet steel, in comparison to hot-dip galvanized sheet steel, generally has a further improved surface quality and equally improved bonderizing-ability in preparation for paint finishing, it must be considered that the production of electro-galvanized sheet steel is more cost-intensive than hot-dip galvanizing due to higher energy consumption and the waste disposal requirements, which the wet chemical process entails.
PRODUCT
The invention relates to a process for manufacturing corrosion-resistant flat steel products, which are provided at least with a first zinc-containing coating, and a second coating lying thereon, which is based on pure magnesium or a magnesium alloy. Such processes are used for example to produce sheet steel, which due to its optimised corrosion resistance is particularly suitable for use in the construction, domestic appliance or motor vehicle industries.
Coatings, which in the predominant number of applications, consist of zinc or zinc alloys are applied to sheet steel in order to improve its corrosion resistance. Such zinc or zinc alloy coatings, due to their barrier and cathodic protection effect, ensure very good corrosion resistance of the coated sheet steel. However despite the quality already achieved up till now, higher and higher requirements in the corrosion resistance and general characteristics of coated sheet steel are demanded by the processors.
At the same time apart from the heavy cost pressure there is a need for better workability of coated sheet steel. In particular surface qualities optimised in relation to the respective intended purpose are demanded.
These demands in practice cannot be met alone by increasing the coating thickness, since on the one hand this is countermanded by economic and ecological reasons and on the other hand increasing the coating thickness involves a general degradation in the formability of sheet steel galvanized in this way.
Galvanized sheet steel is usually converted to consumer articles by forming, joining, organic coating (for example painting) or similar processes. Particularly in the field of motor vehicle body construction the bonding together of preformed steel parts is gaining acceptance. A further important factor is the formability of the coatings, that is to say their ability to withstand even greater transforming stresses, as they occur for example in the case of deep-drawing, without serious damage. None of these demands can be met to the same degree with conventional pure-galvanized products. Rather, conventionally coated sheet steel usually has particularly good characteristics as regards a certain requirement feature, while shortcomings must be accepted as regards other requirement features.
Thus for example hot-dip galvanized sheet steel is characterised by high corrosion resistance in both the unpainted as well as in the painted state. Although electro-galvanized sheet steel, in comparison to hot-dip galvanized sheet steel, generally has a further improved surface quality and equally improved bonderizing-ability in preparation for paint finishing, it must be considered that the production of electro-galvanized sheet steel is more cost-intensive than hot-dip galvanizing due to higher energy consumption and the waste disposal requirements, which the wet chemical process entails.
An improvement in the performance characteristics of galvanized sheet steel can be obtained by applying a second layer, which is based on pure magnesium or a magnesium alloy, to the first protective layer formed by galvanizing.
A characteristic combination is achieved by application of this second magnesium-containing layer, wherein the characteristics of the first zinc-containing layer and the second magnesium-based layer are optimally enhanced.
In order to be able to utilize this optimum characteristic combination of the different layers to the full, the coating process is preferably carried out in such a way that breakdown of the layers is avoided. For this reason a diffusion or convection layer is formed between the zinc-containing and the magnesium-based layer, which ensures the magnesium-containing layer adheres firmly to the zinc layer.
A process, which permits a second layer to be applied to a sheet steel previously coated with a corrosion-protective coating, is for example disclosed by the German Patent DE
195 27 515 Cl or the corresponding European Patent EP 0 756 022 Bl. The corrosion-resistant sheet steel manufactured by this process has enhanced forming and spot weld ability.
For this reason the sheet steel provided with the zinc layer by hot-dip galvanizing or electro-galvanizing is firstly cleaned mechanically or chemically. By means of a suitable PVD (physical vapour deposition) process, a top layer is then deposited on the previously zinc-coated steel substrate. Afterwards the strip coated in this way undergoes heat treatment, which is carried out for at least ten seconds within a temperature range of 300 C - 400 C
in an inert gas or oxygen-lean atmosphere. As the result of this heat treatment the metal of the coating diffuses into the first zinc-containing corrosion protective layer lying on the steel substrate.
In order to be able to precisely control the diffusion process and to achieve good uniformity of the top layer, the sheet steel in the course of the prior art process, before the vacuum coating, undergoes vacuum pre-treatment by ion bombardment or plasma treatment. The galvanized steel substrate to be plated with the second layer of metal is fine-cleaned and conditioned by this pre-treatment so that the metal, deposited in the subsequent PVD process, is distributed widely and densely as a thin layer over the entire zinc coating. Corresponding fine cleaning is necessary, according to the statements of the professional world, particularly if a magnesium-based coating is applied as an external layer to galvanized sheet steel in order to improve its bonding and painting performance.
Despite the characteristic improvements attainable by using the method described in DE 195 27 515 Cl or EP 0 756 022 Bl, this process has not become generally accepted in practice. This is due inter alia to the high construction and operating costs, which are incurred when setting up and maintaining a production line designed for executing the prior art process. These are caused inter alia because a large part of the stages in the prior art process must be carried out under vacuum, in order to manufacture flat steel products plated with at least a zinc coating and a surface layer applied thereon, which meet the strict requirements of the users. Furthermore on an industrial scale it has proven difficult, in the case of economic continuous production, within the narrow time window prescribed in DE 195 27 515 Cl, to heat the strip to 300 -400 C with homogeneous temperature distribution over the strip profile.
The object of the invention was to create a process, which permits economical production of corrosion-resistant sheet steel with good performance characteristics for certain application purposes.
This object was achieved on the basis of the prior art described above through a process for manufacturing a flat steel product made from corrosion-resistant steel, wherein according to the invention a zinc-containing coating is applied by electro-galvanizing to a flat steel product, wherein the flat steel product if required is finally cleaned mechanically and/or chemically, wherein a second magnesium-based coating is applied directly to the finally cleaned zinc-containing coating by means of physical vapour deposition and wherein under normal atmosphere after application of the second coating, post heat treatment of the coated flat steel product is carried out for forming a diffusion or convection layer between the zinc-containing and the magnesium-based coating, at a heat treatment temperature of 320 C to 335 C.
In accordance with the invention, the steel substrate, which is a flat product such as strip or sheet, made from low carbon steel, is firstly galvanized in a conventional way and then cleaned mechanically or chemically in a way, which is equally conventional. Mechanical or chemical cleaning in this case can take place alternatively or in combination, in order to ensure the surface of the zinc coating is as free as possible of grease and loosely adhering zinc material or other residues.
For the invention it is essential that the galvanized flat steel product is completely clean at the end of this cleaning. Thus deviating from the notion, prevailing up until now in the professional world that such an intermediate step is indispensable, with the process according to the invention no further fine cleaning takes place before the magnesium-containing coating is deposited on the zinc-layer. Instead according to the invention the flat steel product, plated with the zinc layer, is fed in the purely mechanically or chemically final cleaned state into the physical vapour deposition, where it is provided with the magnesium-containing external layer.
Surprisingly it has also been shown that a previously galvanized steel sheet or strip, provided in such a way with a magnesium layer, while dispensing with prior reactive plasma cleaning, apart from a surface quality optimised in relation to its optical appearance possesses a bonding performance, which meets all requirements arising in the practical use of such sheet steel.
A test for evaluating bonding performance of coated sheet steel, used in the motor vehicle and steel-making industry, is the so-called "adhesive bead test".
In this test a commercially available structural adhesive, suitable for bonding body components, is applied to the previously degreased surface to be examined. The adhesive is applied in the form of two parallel adhesive beads with a height of 4 - 5 mm and a width of about 10 mm. In order to ensure standard conditions, the geometry of the bead is then adjusted by means of a template. After the adhesive has hardened, possibly assisted by heat, the sheet steel is bent at an angle of approx. 1000. Due to tension between the adhesive and the coating surface, produced by bending, in this case the adhesive bead usually firstly breaks vertically to the specimen surface and then peels away along the specimen surface.
In the case of coated sheet steel with poor bonding performance peeling away takes place in the transient area between the individual coatings or between the lowest coating and the steel substrate. With the method of production according to the invention on the other hand the peeling action, if it occurs at all, is limited to the border between the free surface of the outer lying coating or to the area of the adhesive bead itself. That is to say, despite simplification of the process achieved by the invention, in the case of sheet steel provided according to the invention with a zinc-magnesium plating system, the applied coatings adhere so firmly amongst themselves and to the steel substrate, that in the adhesive bead bending test, the adhesive does not peel away in the coatings or between the coatings and the steel substrate, but at most between the adhesive and the coating or only in the adhesive itself. The quality of an adhesive bond produced with a flat product according to the invention thus only depends on the bonding performance of the adhesive on the surface of the coating. Chipping or lifting of the plating system applied to the steel substrate is reliably prevented, despite fine cleaning being dispensed with according to the invention before vapour deposition of the magnesium layer, due to the heat treatment carried out according to the invention, following application of the magnesium coating.
Apart from the particularly good bonding performance, the stone chip resistance of flat steel products coated according to the invention also meets the requirements demanded in practice. Thus stone chip resistance, which corresponds to that of sheet steel coated in the conventional way, can be ensured for sheet steel coated according to the invention, particularly while maintaining the temperature windows of the heat treatment, indicated below as preferable dependent on the type of zinc coating, despite reactive plasma cleaning being dispensed with before physical vapour deposition plating.
Accordingly flat products manufactured according to the invention are particularly suitable for producing motor vehicle body components, which are formed by bonding individual components with one another.
A pre-condition for the good bonding performance achieved according to the invention is that the steel strip, vapour deposition plated according to the invention with the magnesium layer while dispensing with fine cleaning, undergoes heat treatment following vapour deposition, during which time it is held within the temperature range of 320 C to 335 C, in order to form the diffusion or convection layer between the zinc coating and the magnesium layer. The temperatures of the heat treatment are preferably purposefully selected with regard to as good as possible bonding performance of the finished flat steel product, so that in each case they lie in the upper spectrum of the optimum temperature range for the respective application.
A characteristic combination is achieved by application of this second magnesium-containing layer, wherein the characteristics of the first zinc-containing layer and the second magnesium-based layer are optimally enhanced.
In order to be able to utilize this optimum characteristic combination of the different layers to the full, the coating process is preferably carried out in such a way that breakdown of the layers is avoided. For this reason a diffusion or convection layer is formed between the zinc-containing and the magnesium-based layer, which ensures the magnesium-containing layer adheres firmly to the zinc layer.
A process, which permits a second layer to be applied to a sheet steel previously coated with a corrosion-protective coating, is for example disclosed by the German Patent DE
195 27 515 Cl or the corresponding European Patent EP 0 756 022 Bl. The corrosion-resistant sheet steel manufactured by this process has enhanced forming and spot weld ability.
For this reason the sheet steel provided with the zinc layer by hot-dip galvanizing or electro-galvanizing is firstly cleaned mechanically or chemically. By means of a suitable PVD (physical vapour deposition) process, a top layer is then deposited on the previously zinc-coated steel substrate. Afterwards the strip coated in this way undergoes heat treatment, which is carried out for at least ten seconds within a temperature range of 300 C - 400 C
in an inert gas or oxygen-lean atmosphere. As the result of this heat treatment the metal of the coating diffuses into the first zinc-containing corrosion protective layer lying on the steel substrate.
In order to be able to precisely control the diffusion process and to achieve good uniformity of the top layer, the sheet steel in the course of the prior art process, before the vacuum coating, undergoes vacuum pre-treatment by ion bombardment or plasma treatment. The galvanized steel substrate to be plated with the second layer of metal is fine-cleaned and conditioned by this pre-treatment so that the metal, deposited in the subsequent PVD process, is distributed widely and densely as a thin layer over the entire zinc coating. Corresponding fine cleaning is necessary, according to the statements of the professional world, particularly if a magnesium-based coating is applied as an external layer to galvanized sheet steel in order to improve its bonding and painting performance.
Despite the characteristic improvements attainable by using the method described in DE 195 27 515 Cl or EP 0 756 022 Bl, this process has not become generally accepted in practice. This is due inter alia to the high construction and operating costs, which are incurred when setting up and maintaining a production line designed for executing the prior art process. These are caused inter alia because a large part of the stages in the prior art process must be carried out under vacuum, in order to manufacture flat steel products plated with at least a zinc coating and a surface layer applied thereon, which meet the strict requirements of the users. Furthermore on an industrial scale it has proven difficult, in the case of economic continuous production, within the narrow time window prescribed in DE 195 27 515 Cl, to heat the strip to 300 -400 C with homogeneous temperature distribution over the strip profile.
The object of the invention was to create a process, which permits economical production of corrosion-resistant sheet steel with good performance characteristics for certain application purposes.
This object was achieved on the basis of the prior art described above through a process for manufacturing a flat steel product made from corrosion-resistant steel, wherein according to the invention a zinc-containing coating is applied by electro-galvanizing to a flat steel product, wherein the flat steel product if required is finally cleaned mechanically and/or chemically, wherein a second magnesium-based coating is applied directly to the finally cleaned zinc-containing coating by means of physical vapour deposition and wherein under normal atmosphere after application of the second coating, post heat treatment of the coated flat steel product is carried out for forming a diffusion or convection layer between the zinc-containing and the magnesium-based coating, at a heat treatment temperature of 320 C to 335 C.
In accordance with the invention, the steel substrate, which is a flat product such as strip or sheet, made from low carbon steel, is firstly galvanized in a conventional way and then cleaned mechanically or chemically in a way, which is equally conventional. Mechanical or chemical cleaning in this case can take place alternatively or in combination, in order to ensure the surface of the zinc coating is as free as possible of grease and loosely adhering zinc material or other residues.
For the invention it is essential that the galvanized flat steel product is completely clean at the end of this cleaning. Thus deviating from the notion, prevailing up until now in the professional world that such an intermediate step is indispensable, with the process according to the invention no further fine cleaning takes place before the magnesium-containing coating is deposited on the zinc-layer. Instead according to the invention the flat steel product, plated with the zinc layer, is fed in the purely mechanically or chemically final cleaned state into the physical vapour deposition, where it is provided with the magnesium-containing external layer.
Surprisingly it has also been shown that a previously galvanized steel sheet or strip, provided in such a way with a magnesium layer, while dispensing with prior reactive plasma cleaning, apart from a surface quality optimised in relation to its optical appearance possesses a bonding performance, which meets all requirements arising in the practical use of such sheet steel.
A test for evaluating bonding performance of coated sheet steel, used in the motor vehicle and steel-making industry, is the so-called "adhesive bead test".
In this test a commercially available structural adhesive, suitable for bonding body components, is applied to the previously degreased surface to be examined. The adhesive is applied in the form of two parallel adhesive beads with a height of 4 - 5 mm and a width of about 10 mm. In order to ensure standard conditions, the geometry of the bead is then adjusted by means of a template. After the adhesive has hardened, possibly assisted by heat, the sheet steel is bent at an angle of approx. 1000. Due to tension between the adhesive and the coating surface, produced by bending, in this case the adhesive bead usually firstly breaks vertically to the specimen surface and then peels away along the specimen surface.
In the case of coated sheet steel with poor bonding performance peeling away takes place in the transient area between the individual coatings or between the lowest coating and the steel substrate. With the method of production according to the invention on the other hand the peeling action, if it occurs at all, is limited to the border between the free surface of the outer lying coating or to the area of the adhesive bead itself. That is to say, despite simplification of the process achieved by the invention, in the case of sheet steel provided according to the invention with a zinc-magnesium plating system, the applied coatings adhere so firmly amongst themselves and to the steel substrate, that in the adhesive bead bending test, the adhesive does not peel away in the coatings or between the coatings and the steel substrate, but at most between the adhesive and the coating or only in the adhesive itself. The quality of an adhesive bond produced with a flat product according to the invention thus only depends on the bonding performance of the adhesive on the surface of the coating. Chipping or lifting of the plating system applied to the steel substrate is reliably prevented, despite fine cleaning being dispensed with according to the invention before vapour deposition of the magnesium layer, due to the heat treatment carried out according to the invention, following application of the magnesium coating.
Apart from the particularly good bonding performance, the stone chip resistance of flat steel products coated according to the invention also meets the requirements demanded in practice. Thus stone chip resistance, which corresponds to that of sheet steel coated in the conventional way, can be ensured for sheet steel coated according to the invention, particularly while maintaining the temperature windows of the heat treatment, indicated below as preferable dependent on the type of zinc coating, despite reactive plasma cleaning being dispensed with before physical vapour deposition plating.
Accordingly flat products manufactured according to the invention are particularly suitable for producing motor vehicle body components, which are formed by bonding individual components with one another.
A pre-condition for the good bonding performance achieved according to the invention is that the steel strip, vapour deposition plated according to the invention with the magnesium layer while dispensing with fine cleaning, undergoes heat treatment following vapour deposition, during which time it is held within the temperature range of 320 C to 335 C, in order to form the diffusion or convection layer between the zinc coating and the magnesium layer. The temperatures of the heat treatment are preferably purposefully selected with regard to as good as possible bonding performance of the finished flat steel product, so that in each case they lie in the upper spectrum of the optimum temperature range for the respective application.
As regards suitability of the process according to the invention for economic industrial use, it is of prime importance that the post heat treatment according to the invention can be carried out in air. This also contributes to reducing the capital expense and the costs generally linked with carrying out the process according to the invention to a minimum.
The post heat treatment is preferably carried out so that the coated strip in each case is held for a duration of up to 15 seconds, in particular 5 - 10 seconds, in the range of the optimum heat treatment temperature specified by the invention, so that its surface when leaving the heat-treatment furnace is at the correct heat treatment temperature.
Normal measuring instruments, such as temperature sensors placed abradantly on the strip surface can be used for measuring the respective treatment temperature; said measuring instruments are positioned for example in the discharge region of the furnace at a place, where on the one hand their signals and function are no longer disturbed by the operation of the furnace and on the other hand it is ensured that no substantial cooling of the strip takes place on leaving the furnace. Suitable positioning of the measuring instrument is particularly important if an induction furnace with correspondingly straying electromagnetic fields is used for post heat treatment.
The zinc is applied by electro-galvanizing, thus optimised characteristic combinations arise in the case of the flat products manufactured according to the invention, if the heat treatment temperature selected during the post heat treatment is 320 C to 335 C. When this temperature is maintained, it is possible to ensure in an especially reliable way that no Fe-Zn rich phases are formed in the plating layer, as a result of which the bonding characteristics of sheet steel coated according to the invention might be impaired.
Any PVD process, which is already proven in practice for this purpose, can be used for physical vapour deposition of the magnesium or the magnesium alloy on the galvanized steel substrate.
Practical trials have shown that the working results achieved with the process according to the invention can be further improved if the sheet steel provided with the zinc-containing coating, in the course of its final cleaning, is chemically pre-conditioned by rinsing with a suitable pre-conditioning agent. For this purpose the galvanized steel strip can be rinsed with an alkaline solution in the course of chemical final cleaning.
Likewise with regard to an optimised plating result, it may be advantageous if the chemical final cleaning for example comprises pickling the steel substrate by rinsing with an acid, in particular hydrochloric acid. Following pickling, rinsing with de-mineralized water can ensue in order to remove residues, still remaining on the zinc coated sheet after pickling, as completely as possible.
Further optimisation of the coating result can be achieved if the steel substrate provided with the zinc-containing coating has a roughness Ra on its free surface of at least 1.4 pm, in particular 1.4 - 1.6 pm, when entering the physical vapour deposition, with roughness levels of more than 1.4 um being advantageous. Likewise it is advantageous for optimum adhesion of the magnesium coat to the zinc coating, if the zinc-coated flat steel product has a nib rate RPC of at least 60 per cm when entering the physical vapour deposition. The nib rate RPC and average roughness Ra are calculated by the contact stylus procedure, wherein when determining average roughness Ra the methods used are those indicated in DIN EN ISO
4287:1998 and when determining the nib rate RPC the methods are those indicated in the Iron and Steel Test Sheet September 1940.
Furthermore it has proven advantageous for the result of the physical vapour deposition if the flat steel product, provided with the zinc-containing coating, before entering the physical vapour deposition, is heated to above ambient temperature, however to a temperature below the alloy temperature or held at this. Practical trials have shown that the temperatures particularly suitable for this purpose lie in the range of 230 C - 250 C, in particular approx. 240 C.
The invention therefore makes available a process, which can be carried out particularly economically in a continuously running operation and provides a product that due to its surface quality and bonding performance is particularly suitable for producing components of motor vehicle bodies with application of joining techniques, such as inter-bonding.
The invention is described in detail below on the basis of two exemplary embodiments.
Exemplary embodiment 1 A module for PVD plating and post heat treatment has been integrated into an existing conventional plant for continuous steel strip electro-galvanizing behind the conventional lines used for galvanizing and in front of the plant for final treatment of the finish-coated steel strip.
The steel strip firstly electro-galvanized in the known way in the conventional galvanizing lines of the plant, converted in this manner, after the galvanizing process and final cleaning likewise carried out in the conventional plant, is fed into the module for PVD plating and post heat treatment, where it is PVD plated and post heat treated.
Afterwards the steel strip is returned to the conventional plant, in which for example it is phosphatized and oiled within the context of final treatment.
Steel qualities, which are typical of motor vehicle manufacture, are considered as material for the steel strip, processed in this plant and having normal dimensions. It has proven particularly advantageous if the average roughness of the cold rolled steel used for the electro-galvanized sheet lies at the upper limit of the motor vehicle-standard Ra specification for external parts of 1.1 - 1.6 pm. A further increase in the Ra value above 2 pm would be advantageous as regards the adhesive power of the coating and the bonding performance associated therewith, but under economic criteria at present it does not appear expedient since today such a product would not comply with the specifications of the motor vehicle customers.
A nib rate value RPC of > 60 per cm is preferred. Both values can also be positively influenced during the electro-galvanizing process. A further possibility of controlling these values consists of a cementation process as the ultimate stage of final cleaning.
At strip speeds of 20 - 180 metres per minute the steel strip is firstly provided conventionally by way of electrolysis on either side with a zinc deposit of 3 pm in vertically arranged electrolysis cells by means of soluble anodes. After rinsing and drying the now galvanized steel strip, the galvanized substrate is thoroughly finally cleaned and prepared for application of the magnesium-containing coating.
In order to optimise the result of subsequent physical vapour deposition however, it may be advantageous, as part of the final cleaning, to include pickling of the galvanized steel strip, wherein the steel strip is kept in each case for 5 seconds in a 0.5 % hydrochloric acid bath heated to 20 C. In order to neutralize the acid, the steel strip was then rinsed with de-mineralized water.
The steel strip cleaned this way, after passing through several compression phases, enters a vacuum chamber, in which without any further treatment stage magnesium physical vapour deposition is carried out by means of a PVD
process using a commercial JET evaporator. In order to ensure a constant magnesium thickness of 300 nm at varying strip speeds, the JET evaporator by suitable heat or mechanical means is able to supply evaporation rates of between 6 pm x metre per minute and 54 pm x metre per minute. Via a further number of compression phases the steel strip, now also plated with a magnesium layer, is then again conveyed to normal atmosphere.
Treatment by means of NIR emitters is used in this case for post heat treatment. The heating-up time here depends on the strip speed, but can be varied by switching off individual modules. The peak temperature of the heat treatment according to the invention is 327 C 7K. In order to reliably maintain this narrow temperature window under the conditions of industrial application, a special image-rendering pyrometric process is used, which makes it possible to accurately control the temperature heat treatment according to the invention locally and with respect to time. Different steel substrates and coating conditions in this case may cause deviating emissivities, so that extensive calibration is necessary.
After a free strip run of 10 metres, the steel strip is cooled down by means of water. The residual heat in the strip is controlled so that the strip dries independently.
Fig. 1 as an inverted illustration shows an FE-SEM
photograph of a cross slice specimen of steel strip coated according to the invention and heat-treated at a temperature of 332 C. The advantageous layered structure, with the steel substrate S, the zinc layer Z applied thereon by electro-galvanizing and the magnesium-containing Zn-Mg coating M lying on the zinc layer Z, is clearly recognizable there. The layer, to be seen above the coating M, is bedding-in compound E, which was required for preparing the cross slice.
The post heat treatment is preferably carried out so that the coated strip in each case is held for a duration of up to 15 seconds, in particular 5 - 10 seconds, in the range of the optimum heat treatment temperature specified by the invention, so that its surface when leaving the heat-treatment furnace is at the correct heat treatment temperature.
Normal measuring instruments, such as temperature sensors placed abradantly on the strip surface can be used for measuring the respective treatment temperature; said measuring instruments are positioned for example in the discharge region of the furnace at a place, where on the one hand their signals and function are no longer disturbed by the operation of the furnace and on the other hand it is ensured that no substantial cooling of the strip takes place on leaving the furnace. Suitable positioning of the measuring instrument is particularly important if an induction furnace with correspondingly straying electromagnetic fields is used for post heat treatment.
The zinc is applied by electro-galvanizing, thus optimised characteristic combinations arise in the case of the flat products manufactured according to the invention, if the heat treatment temperature selected during the post heat treatment is 320 C to 335 C. When this temperature is maintained, it is possible to ensure in an especially reliable way that no Fe-Zn rich phases are formed in the plating layer, as a result of which the bonding characteristics of sheet steel coated according to the invention might be impaired.
Any PVD process, which is already proven in practice for this purpose, can be used for physical vapour deposition of the magnesium or the magnesium alloy on the galvanized steel substrate.
Practical trials have shown that the working results achieved with the process according to the invention can be further improved if the sheet steel provided with the zinc-containing coating, in the course of its final cleaning, is chemically pre-conditioned by rinsing with a suitable pre-conditioning agent. For this purpose the galvanized steel strip can be rinsed with an alkaline solution in the course of chemical final cleaning.
Likewise with regard to an optimised plating result, it may be advantageous if the chemical final cleaning for example comprises pickling the steel substrate by rinsing with an acid, in particular hydrochloric acid. Following pickling, rinsing with de-mineralized water can ensue in order to remove residues, still remaining on the zinc coated sheet after pickling, as completely as possible.
Further optimisation of the coating result can be achieved if the steel substrate provided with the zinc-containing coating has a roughness Ra on its free surface of at least 1.4 pm, in particular 1.4 - 1.6 pm, when entering the physical vapour deposition, with roughness levels of more than 1.4 um being advantageous. Likewise it is advantageous for optimum adhesion of the magnesium coat to the zinc coating, if the zinc-coated flat steel product has a nib rate RPC of at least 60 per cm when entering the physical vapour deposition. The nib rate RPC and average roughness Ra are calculated by the contact stylus procedure, wherein when determining average roughness Ra the methods used are those indicated in DIN EN ISO
4287:1998 and when determining the nib rate RPC the methods are those indicated in the Iron and Steel Test Sheet September 1940.
Furthermore it has proven advantageous for the result of the physical vapour deposition if the flat steel product, provided with the zinc-containing coating, before entering the physical vapour deposition, is heated to above ambient temperature, however to a temperature below the alloy temperature or held at this. Practical trials have shown that the temperatures particularly suitable for this purpose lie in the range of 230 C - 250 C, in particular approx. 240 C.
The invention therefore makes available a process, which can be carried out particularly economically in a continuously running operation and provides a product that due to its surface quality and bonding performance is particularly suitable for producing components of motor vehicle bodies with application of joining techniques, such as inter-bonding.
The invention is described in detail below on the basis of two exemplary embodiments.
Exemplary embodiment 1 A module for PVD plating and post heat treatment has been integrated into an existing conventional plant for continuous steel strip electro-galvanizing behind the conventional lines used for galvanizing and in front of the plant for final treatment of the finish-coated steel strip.
The steel strip firstly electro-galvanized in the known way in the conventional galvanizing lines of the plant, converted in this manner, after the galvanizing process and final cleaning likewise carried out in the conventional plant, is fed into the module for PVD plating and post heat treatment, where it is PVD plated and post heat treated.
Afterwards the steel strip is returned to the conventional plant, in which for example it is phosphatized and oiled within the context of final treatment.
Steel qualities, which are typical of motor vehicle manufacture, are considered as material for the steel strip, processed in this plant and having normal dimensions. It has proven particularly advantageous if the average roughness of the cold rolled steel used for the electro-galvanized sheet lies at the upper limit of the motor vehicle-standard Ra specification for external parts of 1.1 - 1.6 pm. A further increase in the Ra value above 2 pm would be advantageous as regards the adhesive power of the coating and the bonding performance associated therewith, but under economic criteria at present it does not appear expedient since today such a product would not comply with the specifications of the motor vehicle customers.
A nib rate value RPC of > 60 per cm is preferred. Both values can also be positively influenced during the electro-galvanizing process. A further possibility of controlling these values consists of a cementation process as the ultimate stage of final cleaning.
At strip speeds of 20 - 180 metres per minute the steel strip is firstly provided conventionally by way of electrolysis on either side with a zinc deposit of 3 pm in vertically arranged electrolysis cells by means of soluble anodes. After rinsing and drying the now galvanized steel strip, the galvanized substrate is thoroughly finally cleaned and prepared for application of the magnesium-containing coating.
In order to optimise the result of subsequent physical vapour deposition however, it may be advantageous, as part of the final cleaning, to include pickling of the galvanized steel strip, wherein the steel strip is kept in each case for 5 seconds in a 0.5 % hydrochloric acid bath heated to 20 C. In order to neutralize the acid, the steel strip was then rinsed with de-mineralized water.
The steel strip cleaned this way, after passing through several compression phases, enters a vacuum chamber, in which without any further treatment stage magnesium physical vapour deposition is carried out by means of a PVD
process using a commercial JET evaporator. In order to ensure a constant magnesium thickness of 300 nm at varying strip speeds, the JET evaporator by suitable heat or mechanical means is able to supply evaporation rates of between 6 pm x metre per minute and 54 pm x metre per minute. Via a further number of compression phases the steel strip, now also plated with a magnesium layer, is then again conveyed to normal atmosphere.
Treatment by means of NIR emitters is used in this case for post heat treatment. The heating-up time here depends on the strip speed, but can be varied by switching off individual modules. The peak temperature of the heat treatment according to the invention is 327 C 7K. In order to reliably maintain this narrow temperature window under the conditions of industrial application, a special image-rendering pyrometric process is used, which makes it possible to accurately control the temperature heat treatment according to the invention locally and with respect to time. Different steel substrates and coating conditions in this case may cause deviating emissivities, so that extensive calibration is necessary.
After a free strip run of 10 metres, the steel strip is cooled down by means of water. The residual heat in the strip is controlled so that the strip dries independently.
Fig. 1 as an inverted illustration shows an FE-SEM
photograph of a cross slice specimen of steel strip coated according to the invention and heat-treated at a temperature of 332 C. The advantageous layered structure, with the steel substrate S, the zinc layer Z applied thereon by electro-galvanizing and the magnesium-containing Zn-Mg coating M lying on the zinc layer Z, is clearly recognizable there. The layer, to be seen above the coating M, is bedding-in compound E, which was required for preparing the cross slice.
Exemplary embodiment 2.
Under the same process conditions at a strip speed of 36 metres per minute as well as with an evaporation rate, increased to 96 um x metre per minute by suitable constructional means, of the evaporator at a strip speed of 64 metres per minute, magnesium deposits of 1500 nm were achieved and thermally alloyed according to the invention.
The advantageous forming of the zinc-magnesium alloy coating was also demonstrated in these tests.
Under the same process conditions at a strip speed of 36 metres per minute as well as with an evaporation rate, increased to 96 um x metre per minute by suitable constructional means, of the evaporator at a strip speed of 64 metres per minute, magnesium deposits of 1500 nm were achieved and thermally alloyed according to the invention.
The advantageous forming of the zinc-magnesium alloy coating was also demonstrated in these tests.
Claims (8)
1. Process for manufacturing corrosion-resistant flat steel products, - wherein a zinc-containing coating is applied by electro-galvanizing to a flat steel product, - wherein the flat steel product if required is finally cleaned mechanically and/or chemically, - wherein a second magnesium-based coating is applied directly to the finally cleaned zinc-containing coating by means of vapour deposition and - wherein under normal atmosphere after application of the second coating, post heat treatment of the coated flat steel product is carried out for forming a diffusion or convection layer between the zinc-containing and the magnesium-based coating, at a heat treatment temperature of 320 °C to 335 °C.
2. Process according to claim 1, characterized in that the flat steel product provided with the zinc-containing coating, in the course of its final cleaning, is chemically pre-conditioned by rinsing with an alkaline pre-conditioning agent.
3. Process according to claim 1 or 2, characterized in that the flat steel product, provided with the zinc-containing coating, in the course of its final cleaning, is pickled by rinsing with an acid, in particular hydrochloric acid.
4. Process according to claim 3, characterized in that after pickling the flat steel product is rinsed with de-mineralized water.
5. Process according to any one of the above claims, characterized in that the post heat treatment is carried out within a duration of 15 seconds at most.
6. Process according to any one of the above claims, characterized in that the flat steel product, provided with the zinc-containing coating, when entering the vapour deposition, on its free surface has a roughness Ra of at least 1.4 µm.
7. Process according to any one of the above claims, characterized in that the nib rate RPC of the flat steel product, provided with the zinc-containing coating, when entering the vapour deposition, is at least 60 per cm.
8. Process according to any one of the above claims, characterized in that the flat steel product, provided with the zinc-containing coating, before entering the vapour deposition, is heated to above ambient temperature, however to a temperature below the alloying temperature of the magnesium coating or held at this.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102005045780A DE102005045780A1 (en) | 2005-09-23 | 2005-09-23 | Method for producing a corrosion-protected flat steel product |
| DE102005045780.0 | 2005-09-23 | ||
| PCT/EP2006/066632 WO2007033992A2 (en) | 2005-09-23 | 2006-09-22 | Method for producing a sheet steel product protected against corrosion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2622817A1 true CA2622817A1 (en) | 2007-03-29 |
Family
ID=37440969
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002622817A Abandoned CA2622817A1 (en) | 2005-09-23 | 2006-09-22 | Method for producing a sheet steel product protected against corrosion |
Country Status (12)
| Country | Link |
|---|---|
| US (1) | US20090139872A1 (en) |
| EP (2) | EP1767670A1 (en) |
| JP (1) | JP2010504420A (en) |
| KR (1) | KR20080058369A (en) |
| CN (1) | CN101268216A (en) |
| AU (1) | AU2006293917A1 (en) |
| BR (1) | BRPI0616110A2 (en) |
| CA (1) | CA2622817A1 (en) |
| DE (1) | DE102005045780A1 (en) |
| RU (1) | RU2008115945A (en) |
| WO (1) | WO2007033992A2 (en) |
| ZA (1) | ZA200802606B (en) |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2045360B1 (en) * | 2007-10-02 | 2011-11-30 | ThyssenKrupp Steel Europe AG | Method for manufacturing a steel part by hot forming and steel part manufactured by hot forming |
| KR100961371B1 (en) * | 2007-12-28 | 2010-06-07 | 주식회사 포스코 | ZINC ALLOY COATED STEEL SHEET HAVING GOOD SEALER ADHESION and CORROSION RESISTANCE AND PROCESS OF MANUFACTURING THE SAME |
| DE102008004728A1 (en) | 2008-01-16 | 2009-07-23 | Henkel Ag & Co. Kgaa | Phosphated steel sheet and method for producing such a sheet |
| PL2098607T3 (en) | 2008-02-25 | 2011-10-31 | Arcelormittal France | Method of coating a metal strip and installation for implementing the method |
| DE102009022515B4 (en) | 2009-05-25 | 2015-07-02 | Thyssenkrupp Steel Europe Ag | Process for producing a flat steel product and flat steel product |
| DE102009051673B3 (en) * | 2009-11-03 | 2011-04-14 | Voestalpine Stahl Gmbh | Production of galvannealed sheets by heat treatment of electrolytically finished sheets |
| DE102012023430A1 (en) * | 2012-11-30 | 2014-06-05 | Bilstein Gmbh & Co. Kg | Hood annealing furnace and method for operating such |
| WO2014155944A1 (en) * | 2013-03-28 | 2014-10-02 | Ｊｆｅスチール株式会社 | Molten-al-zn-plated steel sheet and method for manufacturing same |
| CN103264546B (en) * | 2013-05-30 | 2015-01-07 | 海门市森达装饰材料有限公司 | Stainless steel clad plate and manufacturing method thereof |
| DE102014114365A1 (en) * | 2014-10-02 | 2016-04-07 | Thyssenkrupp Steel Europe Ag | Multilayered flat steel product and component made from it |
| DE102015211853B3 (en) | 2015-06-25 | 2016-06-16 | Thyssenkrupp Ag | Method for coating a surface of a metal strip and metal strip coating device |
| KR102010769B1 (en) * | 2017-03-03 | 2019-08-14 | 한국해양대학교 산학협력단 | Tin/magnesium thin film formed on zinc plated layer and manufacturing method thereof |
| KR102178717B1 (en) | 2018-12-19 | 2020-11-27 | 주식회사 포스코 | Zinc-magnesium alloy plated steel material having excellent adhesion to plating and corrosion resistance, and manufacturing method for the same |
| DE102022133485A1 (en) | 2022-12-15 | 2024-06-20 | Thyssenkrupp Steel Europe Ag | Sheet steel with optimized metal coating |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19527515C1 (en) * | 1995-07-27 | 1996-11-28 | Fraunhofer Ges Forschung | Corrosion-resistant steel sheet prodn., e.g. for the automobile industry |
| DE10039375A1 (en) * | 2000-08-11 | 2002-03-28 | Fraunhofer Ges Forschung | Corrosion-protected steel sheet and process for its manufacture |
| EP1518941A1 (en) * | 2003-09-24 | 2005-03-30 | Sidmar N.V. | A method and apparatus for the production of metal coated steel products |
-
2005
- 2005-09-23 DE DE102005045780A patent/DE102005045780A1/en not_active Withdrawn
-
2006
- 2006-09-22 KR KR1020087008616A patent/KR20080058369A/en not_active Application Discontinuation
- 2006-09-22 AU AU2006293917A patent/AU2006293917A1/en not_active Abandoned
- 2006-09-22 CN CNA2006800349016A patent/CN101268216A/en active Pending
- 2006-09-22 RU RU2008115945/02A patent/RU2008115945A/en unknown
- 2006-09-22 US US12/066,962 patent/US20090139872A1/en not_active Abandoned
- 2006-09-22 CA CA002622817A patent/CA2622817A1/en not_active Abandoned
- 2006-09-22 WO PCT/EP2006/066632 patent/WO2007033992A2/en active Application Filing
- 2006-09-22 JP JP2008531712A patent/JP2010504420A/en active Pending
- 2006-09-22 EP EP06121111A patent/EP1767670A1/en not_active Withdrawn
- 2006-09-22 BR BRPI0616110-3A patent/BRPI0616110A2/en not_active IP Right Cessation
- 2006-09-22 EP EP06793750A patent/EP1934386A2/en not_active Withdrawn
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2008
- 2008-03-20 ZA ZA200802606A patent/ZA200802606B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU2006293917A1 (en) | 2007-03-29 |
| DE102005045780A1 (en) | 2007-04-12 |
| JP2010504420A (en) | 2010-02-12 |
| CN101268216A (en) | 2008-09-17 |
| KR20080058369A (en) | 2008-06-25 |
| BRPI0616110A2 (en) | 2011-06-07 |
| EP1934386A2 (en) | 2008-06-25 |
| EP1767670A1 (en) | 2007-03-28 |
| RU2008115945A (en) | 2009-10-27 |
| ZA200802606B (en) | 2009-06-24 |
| US20090139872A1 (en) | 2009-06-04 |
| WO2007033992A2 (en) | 2007-03-29 |
| WO2007033992A3 (en) | 2007-07-26 |
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