EP4110970A1 - Method for producing hardened steel components with a conditioned zinc anti-corrosive layer - Google Patents
Method for producing hardened steel components with a conditioned zinc anti-corrosive layerInfo
- Publication number
- EP4110970A1 EP4110970A1 EP21707718.9A EP21707718A EP4110970A1 EP 4110970 A1 EP4110970 A1 EP 4110970A1 EP 21707718 A EP21707718 A EP 21707718A EP 4110970 A1 EP4110970 A1 EP 4110970A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- tin
- solution
- steel
- blank
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 229910000760 Hardened steel Inorganic materials 0.000 title claims abstract description 9
- 239000011701 zinc Substances 0.000 title description 43
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title description 42
- 229910052725 zinc Inorganic materials 0.000 title description 42
- 230000001143 conditioned effect Effects 0.000 title description 13
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 58
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 56
- 239000010959 steel Substances 0.000 claims abstract description 56
- 229910052751 metal Inorganic materials 0.000 claims abstract description 20
- 239000002184 metal Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 13
- 229910000734 martensite Inorganic materials 0.000 claims abstract description 8
- 229910001566 austenite Inorganic materials 0.000 claims abstract description 7
- 229910000851 Alloy steel Inorganic materials 0.000 claims abstract description 5
- 230000008859 change Effects 0.000 claims abstract description 5
- 238000000576 coating method Methods 0.000 claims description 51
- 238000000034 method Methods 0.000 claims description 44
- 239000000243 solution Substances 0.000 claims description 30
- 239000011248 coating agent Substances 0.000 claims description 26
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 21
- 230000008569 process Effects 0.000 claims description 21
- 125000005402 stannate group Chemical group 0.000 claims description 19
- 229940071182 stannate Drugs 0.000 claims description 13
- 238000005246 galvanizing Methods 0.000 claims description 12
- 229910001335 Galvanized steel Inorganic materials 0.000 claims description 6
- 239000008397 galvanized steel Substances 0.000 claims description 6
- 238000010791 quenching Methods 0.000 claims description 5
- 239000003929 acidic solution Substances 0.000 claims description 4
- 239000012266 salt solution Substances 0.000 claims description 4
- 239000012670 alkaline solution Substances 0.000 claims description 3
- 230000002378 acidificating effect Effects 0.000 claims description 2
- 239000007864 aqueous solution Substances 0.000 claims description 2
- 230000000536 complexating effect Effects 0.000 claims description 2
- 230000000284 resting effect Effects 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 33
- 238000005260 corrosion Methods 0.000 description 24
- 238000011161 development Methods 0.000 description 16
- 230000018109 developmental process Effects 0.000 description 16
- 230000003750 conditioning effect Effects 0.000 description 14
- 230000007797 corrosion Effects 0.000 description 13
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 12
- 229910052782 aluminium Inorganic materials 0.000 description 12
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 12
- 238000000137 annealing Methods 0.000 description 12
- 238000004140 cleaning Methods 0.000 description 11
- 239000003973 paint Substances 0.000 description 9
- 239000011241 protective layer Substances 0.000 description 8
- HNQGTZYKXIXXST-UHFFFAOYSA-N calcium;dioxido(oxo)tin Chemical compound [Ca+2].[O-][Sn]([O-])=O HNQGTZYKXIXXST-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 230000008595 infiltration Effects 0.000 description 5
- 238000001764 infiltration Methods 0.000 description 5
- 229910000510 noble metal Inorganic materials 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 229910019142 PO4 Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000004888 barrier function Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 235000019589 hardness Nutrition 0.000 description 3
- -1 lead stannate dihydrate Chemical class 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 3
- 239000010452 phosphate Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000003637 basic solution Substances 0.000 description 2
- 238000005422 blasting Methods 0.000 description 2
- PALQHNLJJQMCIQ-UHFFFAOYSA-N boron;manganese Chemical compound [Mn]#B PALQHNLJJQMCIQ-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 235000011089 carbon dioxide Nutrition 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- IOUCSUBTZWXKTA-UHFFFAOYSA-N dipotassium;dioxido(oxo)tin Chemical compound [K+].[K+].[O-][Sn]([O-])=O IOUCSUBTZWXKTA-UHFFFAOYSA-N 0.000 description 2
- SFXJSNATBHJIDS-UHFFFAOYSA-N disodium;dioxido(oxo)tin;trihydrate Chemical compound O.O.O.[Na+].[Na+].[O-][Sn]([O-])=O SFXJSNATBHJIDS-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 229940079864 sodium stannate Drugs 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical group [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 229910000712 Boron steel Inorganic materials 0.000 description 1
- 229910004609 CdSn Inorganic materials 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229920000914 Metallic fiber Polymers 0.000 description 1
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910021626 Tin(II) chloride Inorganic materials 0.000 description 1
- 238000005269 aluminizing Methods 0.000 description 1
- 150000008064 anhydrides Chemical class 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910052788 barium Inorganic materials 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 229910052797 bismuth Inorganic materials 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005238 degreasing Methods 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- KFZAUHNPPZCSCR-UHFFFAOYSA-N iron zinc Chemical compound [Fe].[Zn] KFZAUHNPPZCSCR-UHFFFAOYSA-N 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000005226 mechanical processes and functions Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 150000003891 oxalate salts Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000011253 protective coating Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229910000077 silane Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 238000003980 solgel method Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 150000003606 tin compounds Chemical class 0.000 description 1
- 150000004684 trihydrates Chemical class 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- BNEMLSQAJOPTGK-UHFFFAOYSA-N zinc;dioxido(oxo)tin Chemical compound [Zn+2].[O-][Sn]([O-])=O BNEMLSQAJOPTGK-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0278—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular surface treatment
-
- C—CHEMISTRY; METALLURGY
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
- C23C22/62—Treatment of iron or alloys based thereon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D22/00—Shaping without cutting, by stamping, spinning, or deep-drawing
- B21D22/20—Deep-drawing
- B21D22/208—Deep-drawing by heating the blank or deep-drawing associated with heat treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0242—Flattening; Dressing; Flexing
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
- C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
- C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
- C23C22/50—Treatment of iron or alloys based thereon
-
- 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
- C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C22/82—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
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/02—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material
- C23C28/023—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings only including layers of metallic material only coatings of metal elements only
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/001—Austenite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2261/00—Machining or cutting being involved
Definitions
- the invention relates to a method for producing hardened steel components with a conditioned zinc corrosion protection layer.
- anti-corrosion layers on metal strips can be organic coatings, for example paints, although these paints can also contain anti-corrosion agents.
- metal coatings can consist of an electrochemically noble metal or consist of an electrochemically less noble metal.
- barrier protective layer In the case of a coating made of an electrochemically more noble metal or a metal that passivates itself, such as aluminum, one speaks of a barrier protective layer, whereby, for example, when aluminum is applied to steel, the steel material suffers corrosion if this barrier protective layer is no longer in places is available, for example due to mechanical damage.
- a common barrier protective layer of steel is the aforementioned aluminum layer, which is usually applied by hot-dip coating.
- an electrochemically less noble metal is applied as a protective layer, because in the event of mechanical damage to the corrosion anti-corrosion coating except for the steel material, the electrochemically less noble metal is first corroded before the steel material itself is exposed to corrosion.
- the most commonly used cathodic protective coating on steel is zinc coating.
- a common galvanizing process is so-called hot-dip galvanizing (also known as hot-dip galvanizing).
- Steel is immersed continuously (e.g. strip and wire) or piece by piece (e.g. components) at temperatures of around 450 ° C to 600 ° C in a melt of liquid zinc (the melting point of zinc is 419.5 ° C).
- the zinc melt conventionally has a zinc content of at least 98.0% by weight in accordance with DIN EN ISO 1461.
- a resistant alloy layer of iron and zinc is formed on the steel surface and above it is a firmly adhering pure zinc layer, the composition of which corresponds to the zinc melt.
- the zinc layer has a thickness of 5 ⁇ m to 40 ⁇ m.
- the zinc layer can have a thickness of 50 ⁇ m to 150 ⁇ m.
- electrolytic galvanizing galvanic galvanizing
- steel strips or steel plates are not immersed in a zinc melt, but in a zinc electrolyte.
- the steel to be galvanized is introduced into the solution as a cathode and an electrode made of the purest possible zinc is used as the anode. Electricity is passed through the electrolyte solution.
- the zinc present in ionic form (oxidation level +11) is reduced to metallic zinc and deposited on the steel surface.
- electrolytic galvanizing allows thinner layers of zinc to be applied.
- the zinc layer thickness is proportional to the strength and duration of the current flow, whereby - depending on the workpiece and anode geometry - a layer thickness distribution is created over the entire workpiece.
- Careful surface pretreatment is required to ensure the adhesion and uniformity of the zinc layer. This can be, for example, degreasing, alkaline cleaning, pickling, rinsing and / or pickling.
- one or more subsequent treatments can be carried out, such as phosphating, oiling, applying organic coatings (KTL - cathodic dip painting).
- KTL - cathodic dip painting not only pure metal layers are usually deposited.
- alloys that are deposited; in addition to pure aluminum coatings, there are also coatings that contain aluminum and zinc and coatings that contain small amounts of aluminum in addition to a predominant zinc content, which may also contain other elements, such as zinc, nickel, chromium and magnesium and other elements, as well as mixtures thereof.
- Steel grades that become high-strength through quench hardening are particularly often used.
- a common type of steel that can be hardened by quench hardening are the so-called boron-manganese steels, such as the most commonly used 22MnB5, but also derivatives of this steel, such as 22MnB8, 30MnB8.
- Such steel grades can be easily deformed and cut to size in the unhardened state.
- the first and somewhat older method is the so-called press hardening.
- press hardening a flat plate is cut out of a steel strip made of a quench-hardenable steel alloy, for example a 22MnB5 or a similar manganese-boron steel.
- This flat blank is then heated to such an extent that the steel structure appears in the form of gamma iron or austenite.
- the so-called austenitizing temperature AC3 must be exceeded, at least if complete austenitizing is desired.
- this temperature can be between 820 ° C. and 900 ° C., such steel blanks, for example, being heated to about 900 ° C. to 930 ° C. and held at this temperature until the structure changes completely. Then such a steel blank is transferred in the hot state in a press, in which the hot steel blank is brought into the desired shape with a single press stroke by means of an upper tool and a lower tool, each of which is correspondingly shaped.
- press tools that is to say forming tools, energy is withdrawn from the steel very quickly.
- the heat must be extracted so quickly that the so-called critical hardening speed is exceeded, which is usually between 20 ° and 25 ° Kelvin per second.
- austenite does not change back into a ferritic initial structure, but a martensitic structure is achieved. Due to the fact that austenite can dissolve considerably more carbon in its lattice than martensite, carbon precipitates lead to lattice distortion, which leads to the high hardness of the end product. As a result of the rapid cooling, the martensitic state is stabilized, so to speak. As a result, hardnesses or tensile strengths R m of more than 1500 MPa can be achieved. Hardness profiles can also be set by means of suitable measures, which will not be discussed in more detail, such as complete or partial rewarming.
- press hardening Another, somewhat more recent way of producing hardened steel components, especially for bodywork, is press hardening developed by the applicant.
- press hardening a flat steel plate is cut out of a steel strip and this flat steel plate is then formed in the cold state.
- this reshaping does not take place with a single press stroke, but rather, as is customary in conventional press lines, for example in a five-step process.
- This process allows considerably more complex shapes, so that in the end a complex-shaped component, such as the B-pillar or a longitudinal member of a motor vehicle, can be produced.
- this component is likewise austenitized in a furnace and transferred in the austenitized state to a molding tool, the molding tool having the contour of the final component.
- the preformed component is preferably shaped before heating in such a way that after heating and thus also after thermal expansion has taken place, this component already largely corresponds to the final dimensions of the hardened component.
- This austenitized blank is inserted into the mold in the austenitized state and the mold is closed.
- the component is touched on all sides by the molding tool and held in a clamping manner, and the contact with the molding tool also removes the heat in such a way that a martensitic structure is created. In the clamped state, shrinkage cannot take place, so that the hardened end component with the corresponding final dimensions can be removed from the mold after hardening and cooling.
- Corrosion protection coatings for components to be hardened are, however, exposed to different requirements than corrosion protection coatings for components that are not hardened.
- the high temperatures that arise during hardening must be withstood by the anti-corrosion coatings. Since it has long been known that hot-dip aluminized coatings can also withstand high temperatures, press hardening steels were first developed, which have a protective layer made of aluminum. Such coatings are able to withstand not only the high temperatures, but also the deformation in the hot state.
- the disadvantage is that no hot-dip aluminizing is usually used on conventional steel grades, but hot-dip galvanizing and it is fundamentally problematic to use different corrosion protection systems, especially if there is a risk of contact corrosion.
- zinc coatings are considerably less complicated than aluminum coatings when it comes to forming, as aluminum coatings tend to peel off or crack at conventional forming temperatures. This does not happen with zinc.
- DE 10 2010 037 077 B4 discloses a method for conditioning the surface of hardened corrosion-protected components made of sheet steel, the sheet steel being a sheet steel coated with a metallic coating and being heated and quenched for hardening. After hardening, the oxides present on the anti-corrosion coating due to the heating are removed, the component being subjected to vibratory grinding for conditioning the surface of the metallic coating, i.e. the anti-corrosion layer, the anti-corrosion coating being a zinc-based coating and the Surface conditioning is carried out in such a way that oxides lying or adhering to the corrosion protection layer are abraded and, in particular, a microporosity is exposed.
- Such protective layers usually only occur with zinc coatings, while aluminum coatings often do not have to be cleaned or only have to be subjected to less complex cleaning.
- a sol-gel preconditioning of the layer to reduce oxide layer formation and increase weldability is known.
- the aim is to create an anti-oxidation coating for press-hardening steel materials on the basis of binders containing silane and titanium and oxidic pigments, which are apparently applied in the sol-gel process.
- solvents such as methanol are used here, which cannot be used on steel production plants.
- the coating is said to fall off by itself after press hardening, although tests with titanium and silicon-based coatings took place in 2015/16 and were not successful with either a thick or a thin wet film.
- the coating does not fall off by itself, nor is it suitable for industrial applications.
- the object of the invention is to create a method for producing hardened steel components in which an existing zinc corrosion protection layer is conditioned in such a way that cleaning of the surface and, in particular, cleaning with fluid and / or particle jets after hardening can be dispensed with.
- Another task is to create a galvanized steel strip which is designed in such a way that it is not necessary to clean off an oxide skin.
- a cleaning post-treatment is a manageable and well-established process, but a higher workload is generated.
- the cycle time may have to be adapted.
- the oxide growth during the hardening process can be designed in such a way that subsequent mechanical surface conditioning, such as centrifugal blasting, vibratory grinding or dry ice blasting, is unnecessary.
- metallic tin and in particular tin-containing salt solutions such as salt solutions of the stannates, apparently modify the surface in such a way that any type of cleaning is unnecessary.
- stannates summarizes the salts of tin acids (II) and - (IV).
- Zinc stannate ZnSnCb Zinc stannate ZnSnCb.
- an aqueous alkaline solution is applied by means of a roll coater to a galvanized surface after skin-passing and before the cold forming or annealing and hardening process.
- very thin layers are used, which are aqueous 1-5 ⁇ m and when dried are 50-150 nm thick.
- the tin coverage when using stannates is 30-90 mg tin per m 2 in the form of K2 [Sn0 3 ].
- the surface resistance is very low and even in a paint infiltration test only a very low paint infiltration tendency could be determined.
- significantly fewer oxides can be detected, which is revealed by the metallic sheen of the annealed sheet.
- Such silveryness is usually a problem, since it indicates a lack of thorough reaction.
- Investigations have shown that the zinc-iron crystals of the zinc layer have reacted through.
- a good formation of the phosphate crystals during the phosphating could be determined. This was not to be expected in this form, as expert knowledge indicates that tin has a negative effect on phosphating.
- the invention thus relates in particular to a method for producing hardened steel construction parts, wherein a plate is cut from a galvanized strip made of a hardenable steel alloy and then the plates are cold formed into a component blank and then heated to a temperature that causes a structural change towards austenite, the austenitized component blank is then fed to a form hardening tool, in which the component blank is essentially one of the component blank by means of an upper and lower tool corresponding shape is held positively, with the contact of the material of the component blank to the particularly cooled tools, the heat is withdrawn from the steel material so quickly that martensitic hardening occurs, characterized in that after the galvanizing of the metal strip and before the Increase in temperature for the purpose of austenitizing tin is applied to the surface of the strip or the circuit board or the component blank.
- the tin is applied in ionic form or in metallic form, the tin being applied in ionic form from a salt solution and in metallic form using a CVD or PVD process.
- the tin is applied from an alkaline or acidic solution.
- an aqueous stannate solution is applied, which is set to be basic or acidic.
- the tin in the solution is complexed with citric acid.
- the aqueous solution is applied with a layer thickness of 1-5 ⁇ m, in particular 1-3 ⁇ m, the dried layer thickness being 50-150 nm, in particular 75-125 nm, in particular 80-100 nm.
- the tin coating is 30-90 mg tin / m 2 , in particular 40-80 mg tin / m 2 , and in particular 50-60 mg tin / m 2 .
- a solution with a solution concentration of 150-250 g / l K 2 Sn0 3 * 3Fl 2 0 is used.
- a solution is used that has a pH of 12.5 - 13.5 be.
- a solution is used that has a pH value of 4-5.5 and in which the tin is complexed with citric acid.
- citric acid is contained in an amount of 35-40 g / l for complexing the tin, the pH being 4-5.5.
- the solution concentration is 200 g / l K2Sn03 * 3H20 with 20 g / l KOH.
- Another aspect of the invention relates to a galvanized steel strip coated with 40-80 mg tin / m 2 .
- the tin is deposited in metallic form or in ionic form.
- the tin is deposited from a stannate solution or by means of a PVD or CVD process.
- Another aspect of the invention relates to the use of such a steel strip wel Ches is produced with an aforementioned method, in a method in which a steel sheet is heated for the purpose of austenitizing and then reshaped and quench hardened.
- FIG. 1 the production route in conventional hot-stamping
- FIG. 2 the production route in conventional press hardening
- FIG. 3 a steel sheet after annealing without conditioning and a steel sheet after annealing with an annealing coating according to the invention
- FIG. 4 an electron micrograph of the surface conditioned according to the invention after annealing
- FIG. 5 the element distribution at four different measuring points
- FIG. 6 the surface of a galvanized steel sheet after annealing with an annealing time of 45 seconds and 200 seconds;
- FIG. 7 the surface of the steel sheet after annealing with a surface conditioning according to the invention after 45 seconds and 200 seconds;
- FIG. 8 the electrical resistance of the sheet metal surface for untreated and treated surfaces
- FIG. 9 the infiltration of paint in the case of surfaces not conditioned according to the invention and conditioned according to the invention after six weeks according to the VDA test.
- stannates that can be used have already been listed; a potassium stannate solution is particularly suitable, with one way in principle being the application of stannate or tin in ionic form to the surface.
- Both basic and acidic solutions can be used here and, in particular, solutions in which the tin is complexed can be used.
- an aqueous layer thickness of 1-5 ⁇ m is aimed for, with a getrockne th layer thickness of 50-150 nm and a tin coverage of 30-90 mg tin / m 2 in the form of K 2 [Sn0 3 ].
- FIGS. 1 and 2 show conventional processes in which a galvanized steel sheet, in which the zinc layer contains an element with an affinity for oxygen, for example aluminum, is either austenitized before forming or austenitized after forming and quench hardened in a press .
- both sheets After hardening, both sheets have a glass-like, hard layer on the surface, in particular made of aluminum oxide, which is preferably cleaned off.
- the conditioning of the surface with very small amounts of tin obviously affects the formation of the vitreous or hard layer to such an extent that it does not arise in this form or is conditioned to such an extent that it does not have to be cleaned.
- a conventionally produced hardened steel plate shows a greenish beige appearance on the surface, which is caused by oxides.
- the sheet When conditioned with a stannate solution, the sheet shows a silvery surface (FIG. 3).
- FIG. 2 a surface designed and conditioned according to the invention can be seen in an electron microscopic view, a basic solution of potassium stannate with potassium hydroxide having been applied with a roll coater before the heat treatment.
- the concentration of the solution which is used for conditioning by means of roll coating, is chosen so that with a wet film of 1 ⁇ m 50-60 mg tin / m 2 are deposited.
- a layer applied in this way causes a modification of the oxide layer that forms during annealing, so that mechanical cleaning by means of a centrifugal wheel or other mechanical processes is no longer necessary.
- a solution which effects conditioning according to the invention has a solution concentration of 180-220 g / l K2Sn03 * 3H20.
- 15-25 g / l KOH can be added to the solution so that a pH of approx. 13, ie 12.5-13.5, is established. Since acidic solutions are usually used in practice and stan nate solutions often tend to form precipitates during acidification, the tin can be complexed in a suitable manner to the extent that a clear, precipitate-free solution is obtained by adding citric acid in an amount of 30 - 50 g / l is added, resulting in a pH of about 4.8.
- FIG. 6 the surface of a conventional sheet metal which has not been conditioned according to the invention can be seen again after 45 seconds and 200 seconds of annealing at 870.degree. Both sheets show the beige-green color already mentioned.
- FIG. 7 the surfaces of two metal sheets which have been conditioned according to the invention can be seen after an annealing time of 45 seconds and 200 seconds at 870.degree. The differences in the surface color are clearly visible.
- the surface conditioning according to the invention also provides an advantage in terms of corrosion in terms of the infiltration of the paint, because as the results in FIG is infiltrated to a greater extent than with other sheets.
- the conditioning according to the invention was presented in particular on the basis of the stannates.
- the titanates, oxalates and zirconates also have essentially the same chemical reaction. Accordingly, it can be assumed that these are equally effective, in particular the corresponding tin compounds.
- the tin seems to be particularly effective, which is why the surface conditioning succeeds even when the tin is metallic.
- the deposition of the tin on the surface with the help of the stannates, i.e. in ionic form, has the advantage that it can be applied in a comparatively simple manner using a roll coating process.
- the application can be done inline on the belt before it is cut into individual blanks.
- the blanks cut out of the strip can be coated accordingly.
- the blanks are then formed into a component blank, in particular in a multi-stage process. Coating only the component blank with the Zinnver bond or the tin is also conceivable. However, it has been shown that the tin or tin salt coating also tolerates the forming processes well.
- a raw component obtained in this way is heated to a temperature that causes a structural change towards austenite.
- the austenitized component blank is then fed to a form hardening tool in which the component blank is hardened in one stroke by applying an upper and lower tool, which essentially have the shape of the blank or correspond to it. Because the material as the component blank is in contact with the, in particular, cooled tools, the heat is withdrawn from the steel material so quickly that martensitic hardening occurs.
- the advantage of the invention is that it is possible to condition the surface of a steel sheet provided for form hardening or press hardening in such a way that mechanical final cleaning to remove oxidic surface layers can be dispensed with, so that such sheets can be produced in the same way as, for example, hot-dip aluminized sheets , can be processed, but with the advantage that a high cathodic corrosion protection effect is achieved compared to hot-dip aluminized sheets.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20160202.6A EP3872230A1 (en) | 2020-02-28 | 2020-02-28 | Method for producing hardened steel components with a conditioned zinc alloy corrosion protection layer |
PCT/EP2021/054962 WO2021170860A1 (en) | 2020-02-28 | 2021-03-01 | Method for producing hardened steel components with a conditioned zinc anti-corrosive layer |
Publications (3)
Publication Number | Publication Date |
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EP4110970A1 true EP4110970A1 (en) | 2023-01-04 |
EP4110970B1 EP4110970B1 (en) | 2023-10-04 |
EP4110970C0 EP4110970C0 (en) | 2023-10-04 |
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EP20160202.6A Withdrawn EP3872230A1 (en) | 2020-02-28 | 2020-02-28 | Method for producing hardened steel components with a conditioned zinc alloy corrosion protection layer |
EP21707718.9A Active EP4110970B1 (en) | 2020-02-28 | 2021-03-01 | Method for producing hardened steel components with a conditioned zinc alloy corrosion protection layer |
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EP20160202.6A Withdrawn EP3872230A1 (en) | 2020-02-28 | 2020-02-28 | Method for producing hardened steel components with a conditioned zinc alloy corrosion protection layer |
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US (1) | US20230145863A1 (en) |
EP (2) | EP3872230A1 (en) |
CN (1) | CN115485415B (en) |
WO (1) | WO2021170860A1 (en) |
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CN116810601B (en) * | 2023-08-10 | 2024-01-09 | 天津华源线材制品有限公司 | Treatment device and treatment method for surface coating of galvanized wire |
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AU2002363057A1 (en) * | 2001-08-03 | 2003-05-06 | Elisha Holding Llc | An electrolytic and electroless process for treating metallic surfaces and products formed thereby |
EP1630244B2 (en) | 2003-04-23 | 2016-08-17 | Nippon Steel & Sumitomo Metal Corporation | Hot press formed product and method for production thereof |
JP4473587B2 (en) * | 2004-01-14 | 2010-06-02 | 新日本製鐵株式会社 | Hot-dip galvanized high-strength steel sheet with excellent plating adhesion and hole expandability and its manufacturing method |
JP2007231366A (en) * | 2006-03-01 | 2007-09-13 | Jfe Steel Kk | Precoat thick steel plate |
DE102007022174B3 (en) | 2007-05-11 | 2008-09-18 | Voestalpine Stahl Gmbh | Method for creating and removing a temporary protective layer for a cathodic coating |
US20100259163A1 (en) | 2007-12-11 | 2010-10-14 | Idemitsu Kosan Co., Ltd. | Polymer compound and organic electroluminescent device using the same |
KR101798257B1 (en) | 2010-02-19 | 2017-11-15 | 타타 스틸 네덜란드 테크날러지 베.뷔. | Strip, sheet or blank suitable for hot forming and process for the production thereof |
DE102010037077B4 (en) | 2010-08-19 | 2014-03-13 | Voestalpine Stahl Gmbh | Process for conditioning the surface of hardened corrosion-protected steel sheet components |
HUE052381T2 (en) * | 2010-12-24 | 2021-04-28 | Voestalpine Stahl Gmbh | Method for producing hardened structural elements |
DE102011056846B4 (en) * | 2011-12-22 | 2014-05-28 | Thyssenkrupp Rasselstein Gmbh | Method for producing a tear-open lid and use of a steel sheet provided with a protective layer for producing a tear-open lid |
JP2013237912A (en) * | 2012-05-16 | 2013-11-28 | Nippon Steel & Sumitomo Metal Corp | High-tension cold-rolled steel strip excellent in chemical convertibility, and manufacturing method of the same |
DE102012212598A1 (en) * | 2012-07-18 | 2014-02-20 | Henkel Ag & Co. Kgaa | Tinning pretreatment of galvanized steel in the presence of pyrophosphate |
DE102013100682B3 (en) * | 2013-01-23 | 2014-06-05 | Voestalpine Metal Forming Gmbh | A method of producing cured components and a structural component made by the method |
DE102013015032A1 (en) * | 2013-09-02 | 2015-03-05 | Salzgitter Flachstahl Gmbh | Zinc-based corrosion protection coating for steel sheets for producing a component at elevated temperature by press hardening |
WO2017017485A1 (en) * | 2015-07-30 | 2017-02-02 | Arcelormittal | A method for the manufacture of a phosphatable part starting from a steel sheet coated with a metallic coating based on aluminium |
JP6959343B2 (en) | 2017-01-09 | 2021-11-02 | ヘンケル・アクチェンゲゼルシャフト・ウント・コムパニー・コマンディットゲゼルシャフト・アウフ・アクチェンHenkel AG & Co. KGaA | Curable protective coating composition |
WO2019189842A1 (en) * | 2018-03-30 | 2019-10-03 | Jfeスチール株式会社 | High-strength galvanized steel sheet, high-strength member, and manufacturing methods therefor |
-
2020
- 2020-02-28 EP EP20160202.6A patent/EP3872230A1/en not_active Withdrawn
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2021
- 2021-03-01 EP EP21707718.9A patent/EP4110970B1/en active Active
- 2021-03-01 WO PCT/EP2021/054962 patent/WO2021170860A1/en unknown
- 2021-03-01 US US17/802,576 patent/US20230145863A1/en active Pending
- 2021-03-01 CN CN202180017429.XA patent/CN115485415B/en active Active
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CN115485415A (en) | 2022-12-16 |
WO2021170860A1 (en) | 2021-09-02 |
EP3872230A1 (en) | 2021-09-01 |
EP4110970C0 (en) | 2023-10-04 |
US20230145863A1 (en) | 2023-05-11 |
CN115485415B (en) | 2023-11-21 |
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