EP3019639A1 - Verfahren zur verbesserung der haftfähigkeit - Google Patents
Verfahren zur verbesserung der haftfähigkeitInfo
- Publication number
- EP3019639A1 EP3019639A1 EP14744292.5A EP14744292A EP3019639A1 EP 3019639 A1 EP3019639 A1 EP 3019639A1 EP 14744292 A EP14744292 A EP 14744292A EP 3019639 A1 EP3019639 A1 EP 3019639A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- ppm
- aqueous composition
- oxide layer
- steel sheet
- protective coating
- 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
- 238000000034 method Methods 0.000 title claims abstract description 47
- 239000000203 mixture Substances 0.000 claims abstract description 66
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 57
- 239000010959 steel Substances 0.000 claims abstract description 57
- 239000011253 protective coating Substances 0.000 claims abstract description 40
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 30
- 229910018134 Al-Mg Inorganic materials 0.000 claims abstract description 16
- 229910018467 Al—Mg Inorganic materials 0.000 claims abstract description 16
- 238000004381 surface treatment Methods 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 74
- 230000001681 protective effect Effects 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 19
- 239000011777 magnesium Substances 0.000 claims description 18
- 230000008569 process Effects 0.000 claims description 14
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 10
- 229910052782 aluminium Inorganic materials 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 238000010924 continuous production Methods 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 239000011701 zinc Substances 0.000 claims description 5
- 239000012044 organic layer Substances 0.000 claims description 4
- 230000000779 depleting effect Effects 0.000 claims description 3
- 229910052725 zinc Inorganic materials 0.000 claims description 3
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 2
- 239000002318 adhesion promoter Substances 0.000 claims description 2
- 238000004090 dissolution Methods 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract 1
- 238000011437 continuous method Methods 0.000 abstract 1
- 229910052593 corundum Inorganic materials 0.000 abstract 1
- 238000005554 pickling Methods 0.000 abstract 1
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract 1
- 239000011572 manganese Substances 0.000 description 10
- 239000011734 sodium Substances 0.000 description 9
- 239000000853 adhesive Substances 0.000 description 8
- 230000001070 adhesive effect Effects 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 7
- 238000000576 coating method Methods 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000002161 passivation Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 229910001868 water Inorganic materials 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 229910052698 phosphorus Inorganic materials 0.000 description 4
- 229910019142 PO4 Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 229910052759 nickel Inorganic materials 0.000 description 3
- 235000021317 phosphate Nutrition 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000007598 dipping method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000005246 galvanizing Methods 0.000 description 2
- 238000010327 methods by industry Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 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
- 238000005266 casting Methods 0.000 description 1
- 238000004532 chromating Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 229910001610 cryolite Inorganic materials 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 fluoride compound Chemical class 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 150000002681 magnesium compounds Chemical class 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- MQWLIFWNJWLDCI-UHFFFAOYSA-L zinc;carbonate;hydrate Chemical compound O.[Zn+2].[O-]C([O-])=O MQWLIFWNJWLDCI-UHFFFAOYSA-L 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
- 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
- C23C22/83—Chemical after-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/26—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/34—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the shape of the material to be treated
- C23C2/36—Elongated material
- C23C2/40—Plates; Strips
-
- 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
- C23C22/34—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 containing fluorides or complex fluorides
-
- 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
- C23C22/68—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 solutions with pH between 6 and 8
-
- 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
- C23C22/73—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 characterised by the process
-
- 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
- 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
- C23G1/24—Cleaning or pickling metallic material with solutions or molten salts with neutral solutions
Definitions
- the invention relates to a method for improving the adhesion on a protective coated steel sheet, in which a Zn-Al-Mg-based protective coating is applied to the steel sheet in a continuous process and subjected to a surface treatment in a further step, wherein the application of an aqueous composition the natural oxide layer containing Al 2 O 3 and MgO is modified without decapitation.
- WO2006045570A1 proposes that this adhesion to the protective coated steel strip by a modification of the natural oxide Increase layer without depleting this natural oxide layer.
- cooling of the steel sheet with an aqueous composition or a cooling medium is performed, which is to improve the natural oxide layer of the protective coating, for example comprising Zn, Mg and Al.
- Soluble salts for protecting the natural oxide layer or phosphates for stabilizing the sheet surface may be added to the aqueous composition.
- such a process can not lead to a marked increase in adhesiveness.
- the object of the invention is therefore to provide, starting from the initially described prior art, a method with which the surface of the protective coating can be modified with as little effort as possible in such a way that the adhesion to the protective-coated steel sheet is significantly increased.
- the invention solves this problem by the fact that the protective coated steel sheet trained and then reacts the natural oxide layer with an aqueous fluoride-containing composition with reduction of their MgO content in order to modify the natural oxide layer.
- the proportion of MgO in the natural oxide layer of the protective coating can be reduced in a gentle manner.
- This modification of the oxide layer can result in a considerable increase in adhesiveness, in particular with regard to the ready-to-wear and / or over-coatability of a protective-coated steel sheet.
- it can also be used to improve the connection of an adhesive so as to preclude adhesive failure at splices. But especially the invention of the State of the art stand out in that this improved adhesion can be achieved without picking the natural oxide layer.
- the oxide film can be activated by the skin-pass coating of the present invention for fluoride-responsive depletion of MgO.
- Al which has a comparatively high oxygen affinity, can therefore increase in its concentration primarily in the oxide layer or, because of the MgO reduction, it can occupy vacancies in the oxide layer.
- the latter can contribute in particular to the fact that a diffusion of magnesium into the oxide layer or a magnesium breakthrough is reduced.
- the oxide layer naturally forming on a Zn-Al-Mg protective coating can thus be shifted in terms of process engineering in an easy to handle manner in the direction of increased proportions of Al 2 O 3 and / or ZnO and reduced amounts of MgO. According to the invention, a particularly well reproducible method is thus created.
- the unit of measurement is ppm ppm by weight.
- adhesion-improving advantages may also result, for example, as a result of improved adhesiveness.
- the invention may be particularly useful for improving the adhesion of an organic coating to the protective coated steel sheet.
- the aqueous composition of 20 to 3500 ppm F (Fluoride), optionally 0 to 35000 ppm Na (sodium), 0 to 4000 ppm Al (aluminum), 0 to 4000 ppm Mn (manganese), 0 to 20 ppm P (phosphorus), 0 to 10 ppm Fe (iron), 0 to 10 ppm Ni (nickel) and / or 0 to 10 ppm Si (silicon) and the remainder H20 (water) as well as production-related unavoidable impurities.
- Al, Mn, Fe, Ni, P and / or Si may be useful for initiating MgO reduction or stabilizing the modified oxide layer. Concentrations of a total of less than 50 ppm can be considered as inevitable impurities due to production.
- a concentration of F of from 20 to 3500 ppm or from 5 to 3500 ppm or preferably from 5 to 1500 ppm in the aqueous composition may prove to be a directed attack on MgO of the oxide layer or leaching out of Mg.
- sufficient for this purpose may already be a concentration of F of 5 to 1500 ppm or of 10 to 500 ppm or of 20 to 150 ppm or of 30 to 1500 ppm or of 30 to 300 ppm.
- the oxide layer naturally forming on a Zn-Al-Mg protective coating can be further shifted in terms of process engineering in the direction of increased proportions of Al 2 O 3 and reduced amounts of MgO if the aqueous composition comprises Al.
- a concentration of Al of more than 2 ppm, in particular more than 5 ppm be sufficient.
- Mn of more than 3 ppm, in particular more than 5 ppm is conceivable for reducing the MgO content of the oxide layer.
- the protective coating can be surface-treated with the aqueous composition for 0.5 to 20 seconds (seconds), in particular 1.5 to 15 seconds (seconds).
- seconds 0.5 to 20 seconds
- seconds 1.5 to 15 seconds
- a short Treatment particularly suitable for a continuous process.
- the duration of treatment may be shorter. For example, at 1500ppm fluoride with a treatment time of 1.5 seconds, the expense can be found, while with 20ppm fluoride, a 20 second treatment time should be sought to reduce the MgO content of the natural oxide layer without depleting it.
- the reaction rate of the aqueous composition with the Zn-Al-Mg protective coating can be relatively easily adjusted to a belt running speed of the continuous process.
- an acidic adjustment of the pH an increased reduction of the MgO content in the oxide layer can be ascertained.
- sufficient for this purpose may already be a pH of 5 to 7.5 or from 6 to 7.
- a temperature of the aqueous composition of 30 to 95 ° C (degrees Celsius) may be sufficient to further increase their reaction rate with the natural, so the native oxide layer. As favorable for this, however, a temperature of the aqueous composition of 45 to 90 ° C or from 45 to 80 ° C turn out.
- the preparation of the aqueous composition can be carried out in a simple manner if NaF and / or NaHF 2 (biofluoride) is used for this purpose.
- the preparation of the aqueous composition can be carried out comparatively inexpensively if Na 3 [AIF 6 ] (cryolite) is used for this purpose.
- Na also exists in the aqueous composition.
- a concentration of Na from 5 to 35,000 ppm or more, in particular from 10 to 3500 ppm, preferably from 20 to 2000 ppm.
- the process according to the invention can be distinguished, in particular, by a protective coating which contains 0.1 to 7% by weight of aluminum, 0.2 to 5% by weight of magnesium and the remainder zinc and unavoidable impurities as a result of the preparation.
- Such Zn-Al-Mg protective coatings can be an oxide layer with respect to unmodified oxide layers of the same alloy composition in their MgO content particularly well reduced, which can be used for a significant increase in adhesion.
- the protective coating specified above may contain 1 to 4% by weight of aluminum and 1 to 3% by weight of magnesium, in order to increase not only an improvement in adhesiveness but also the reproducibility of the process.
- the activation of the oxide layer for a subsequent surface treatment can be improved if, when the steel sheet is applied by casting, dressing impressions are introduced into the protective coating.
- these dressing impressions preferably in their edge regions, form an improved attack surface for fluoride in order to increasingly dissolve MgO from the natural oxide layer.
- MgF 2 magnesium fluoride
- the formation of magnesium fluoride (MgF 2 ) could be observed here or in this marginal area, which can further improve the adhesion.
- more Zn5 (OH) 6 (CO3) 2 zinc hydroxide carbonate
- the fluoride-containing aqueous composition can be easily removed from the surface of the protective coating when the protective coating is rinsed with a second liquid immediately after the surface treatment with the first fluoride-containing aqueous composition.
- this aftertreatment with such a liquid can additionally increase the removal of MgO, with H 2 O in particular being able to be distinguished as the second liquid. If the second liquid has up to 20 ppm P and / or Si, as well as the remainder H 2 O and unavoidable impurities, then the native oxide layer reduced in MgO can be further stabilized. With P it is to be expected that this occurs as phosphate in the liquid.
- the rinsing action of the second liquid can be significantly improved if the second liquid has a temperature of 20 to 90 ° C.
- the temperature may be in the range of 35 to 85 ° C or 40 to 75 ° C.
- Simple process conditions can occur when the aqueous composition and / or the second liquid is applied to the protective-coated steel sheet in a spraying, dipping or rolling process.
- the method according to the invention can prove useful if, after the surface treatment of the protective-coated steel sheet, an organic layer is provided on the protective coating.
- An adhesion promoter may be an example of such an organic layer.
- the invention may be distinguished from what is known when an aqueous fluoride-containing composition is used to reduce the MgO content of the natural oxide layer of a Zn-Al-Mg protective coating on a dressed steel sheet, without thereby dekapieren the natural oxide layer.
- a liquid having the composition according to one of claims 3 to 6 can be distinguished.
- Fig. 1 is a schematically illustrated apparatus for modifying the oxide layer of a steel sheet with Zn-Al-Mg protective coating and
- a device 1 is shown with which a continuous process for improving the adhesion to a protective coated steel sheet 2 is made possible.
- a Zn-Al-Mg-based protective coating is first applied to a moving steel sheet 2 by means of a hot-dip process 3.
- Hot-dip galvanizing strip galvanizing
- hot-dip process 3 the representation of the relevant plant parts of the device 1 for clarity was limited to a continuous furnace 18, a molten bath 3, a scraper 19 for adjusting the coating pad and a cooling 20.
- the steel sheet 2 After carrying out the hot-dip process 3, the steel sheet 2 has a Zn-Al-Mg protective coating which forms a natural oxide layer 9.
- This native oxide layer 9 is known to comprise Al 2 O 3 10, MgO 11 and also, although to a lesser extent, ZnO 12.
- the proportion of MgO 1 1 in the oxide layer 9 is comparatively high, as can be seen in FIG. 2.
- MgO 1 1 can be seen on the bright surface, Al 2 O 3 10 on the dark surface, and ZnO 12 on a mixture of light and dark surfaces. Due to a predominantly bright MgO surface on the surface of the Zn-Al-Mg protective coating, a considerable reduced adhesion is to be expected. According to the invention, such dominant MgO accumulations in the oxide layer 9 are avoided by passing the steel sheet 2 provided with a Zn-Al-Mg protective coating through a skin pass mill 5 and thus preparing it to modify its natual oxide layer 9 - prepared for a surface treatment 6 with application of an aqueous fluoride-containing composition 7 in order to reduce its MgO content without picking up the natural oxide layer 9. According to FIG.
- this process step is realized with spray bars 8 arranged on both sides of the steel sheet 2, which spray or apply the aqueous fluoride-containing composition 7 onto the steel sheet 2.
- spray bars 8 arranged on both sides of the steel sheet 2, which spray or apply the aqueous fluoride-containing composition 7 onto the steel sheet 2.
- the spraying method 13 instead of the spraying method 13, of course, an application with a rolling or dipping method not shown is conceivable.
- the aqueous composition subsequently dissolves MgO 11 from the oxide layer 9 and converts this into the aqueous composition 7.
- the amount of fluoride, measured with a fluoride-sensitive electrode, in the aqueous composition 7 is adjusted to a dissolution of Mg of the oxide layer 9.
- the proportion of MgO 1 1 in the native oxide layer 9 is thus reduced, so that due to the high oxygen affinity of Al increasingly Al 2 O 3 10 can be expressed on the modified natural or native oxide layer 9.
- FIG. 3 shows MgO 1 1 on bright surfaces, in comparison to FIG. 2, the MgO 1 1 content is extremely small.
- Al 2 O 3 10 dark area
- ZnO 12 or Zn5 (OH) 6 (CO 3) 2 mixture of light and dark areas
- the modified natural oxide layer 9 of FIG. 3 has substantially Al 2 O 3 10 and thus forms a barrier layer, which not only a breakthrough of Mg in the oxide layer 9 for the formation of MgO 1 1, but also the diffusion of O through the oxide layer is reduced. Even with comparatively long storage times of the steel sheet 2, this modified natural oxide layer 9 still exhibits a comparatively high adhesiveness.
- the pH is adjusted in a range from 4 to 8, in particular slightly acidic, and in addition, the aqueous composition should have a temperature of 30 to 95 ° C (degrees Celsius).
- aqueous composition of 20 to 3500 ppm F (fluoride), optionally 0 to 35000 ppm Na (sodium), 0 to 4000 ppm Al (aluminum), 0 to 4000 ppm Mn (manganese), 0 to 20 ppm P (phosphorus), 0 to 10 ppm Fe (iron), 0 to 10 ppm Ni (nickel) and / or 0 to 10 ppm Si (silicon) and the remainder H2O (water ) as well as production-related unavoidable impurities.
- a concentration of F of 5 to 3500 ppm or of 5 to 1500 ppm or of 5 to 1500 ppm or of 10 to 500 ppm or of 20 to 150 ppm or of 30 to 1500 ppm or of 30 to 300 may already be sufficient be ppm.
- Al of the aqueous composition can improve the oxide layer in the direction of increased proportions of Al 2 O 3 and reduced levels of MgO.
- Al of the aqueous composition 7 preferably attaches to the Mg reduced sites of the oxide layer. Such sites may result upon treatment of the oxide layer with the aqueous composition 7, for example, by dissolving MgO from the oxide layer to convert it to MgOHF. A similar effect can also be achieved with Mn.
- the protective-coated steel sheet 2 reacts with the aqueous fluoride-containing composition 7 to reduce its MgO content by adding Mg and / or a magnesium compound (eg MgO 11) of the oxide layer 9 is dissolved out with fluoride and / or a fluoride compound (eg HF) and replaced by Al and / or Mn in order to modify the natural oxide layer in the direction of a reduced MgO content.
- the fluoride-containing aqueous composition 7, which has been applied to the steel strip 2 via the spray bars 8, is removed from the steel strip 2 by means of a sink, which performs a spraying process 14.
- the protective coating is surface treated immediately after treatment via spray bar 17 with a second liquid 15.
- This second liquid 15 consists of H 2 O, but may also have P or Si less than 20 mg / l and unavoidable impurities, P optionally being present as phosphate in the liquid 15.
- a treatment time of 1 to 10 seconds has been found to be sufficient.
- Table 1 the examined steel sheets in comparison
- the hot-dip galvanized steel sheets A (Ai or A 2 ) and B have a deep-drawing quality DX53D and a sheet thickness of 0.75 mm.
- As a protective coating ZnAl 2 .5 Mg 1. 5 (96% by weight of Zn, 2.5% by weight of Al, 1. 5% by weight of Mg) was applied.
- the steel sheets A (Ai or A 2 ) and C (Ci or C 2 ) were as shown in Fig. 1 subjected to the modification according to the invention of their oxide layers.
- the aqueous composition 7 for the treatment of steel sheet Ai and Ci fluoride was added as Na 3 [AIF 6 ].
- this aqueous composition 7 consists of fluoride, Na, Al, H2O and unavoidable impurities smaller than 10ppm.
- NaF aqueous composition for treatment of steel sheets A 2 and C 2
- this composition can be enriched with Al.
- NaHF 2 biofluoride
- the steel sheets A (Ai and A 2 ) and C (Ci and C 2 , respectively) were treated with the respective aqueous composition for 10 seconds. Subsequently, the steel sheets A and C were rinsed with H 2 O for 10 seconds. In this second liquid 15, a temperature of 35 degrees Celsius was set.
- All steel sheets A, B, C and D were then treated with an organic coating, namely with a one-component epoxy resin adhesive (eg: BM1496). see and the adhesiveness of the adhesive on the protective coating determined by a tensile shear test.
- a one-component epoxy resin adhesive eg: BM1496
- the method according to the invention can modify the oxide layer of the Zn-Al-Mg protective coating in such a way that the adhesiveness to an adhesive on the protective-coated steel sheet A or C is significantly improved compared to a prior art steel sheet B or D.
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
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Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP14744292.5A EP3019639B1 (de) | 2013-07-12 | 2014-07-11 | Verfahren zur verbesserung der haftfähigkeit |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP13176397.1A EP2824213A1 (de) | 2013-07-12 | 2013-07-12 | Verfahren zur Verbesserung der Haftfähigkeit auf einem schutzbeschichteten Stahlblech |
EP14744292.5A EP3019639B1 (de) | 2013-07-12 | 2014-07-11 | Verfahren zur verbesserung der haftfähigkeit |
PCT/EP2014/064987 WO2015004284A1 (de) | 2013-07-12 | 2014-07-11 | Verfahren zur verbesserung der haftfähigkeit |
Publications (2)
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EP3019639A1 true EP3019639A1 (de) | 2016-05-18 |
EP3019639B1 EP3019639B1 (de) | 2019-02-27 |
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EP13176397.1A Withdrawn EP2824213A1 (de) | 2013-07-12 | 2013-07-12 | Verfahren zur Verbesserung der Haftfähigkeit auf einem schutzbeschichteten Stahlblech |
EP14744292.5A Active EP3019639B1 (de) | 2013-07-12 | 2014-07-11 | Verfahren zur verbesserung der haftfähigkeit |
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EP13176397.1A Withdrawn EP2824213A1 (de) | 2013-07-12 | 2013-07-12 | Verfahren zur Verbesserung der Haftfähigkeit auf einem schutzbeschichteten Stahlblech |
Country Status (7)
Country | Link |
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US (1) | US9920430B2 (de) |
EP (2) | EP2824213A1 (de) |
CN (1) | CN105492646B (de) |
ES (1) | ES2727870T3 (de) |
MX (1) | MX2016000256A (de) |
WO (1) | WO2015004284A1 (de) |
ZA (1) | ZA201600018B (de) |
Families Citing this family (11)
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DE102018202867A1 (de) * | 2018-02-26 | 2019-08-29 | Thyssenkrupp Ag | Verfahren zur Anpassung, Homogenisierung und Aktivierung von Oberflächen mit dem Ziel verbesserter Oberflächeneigenschaften |
DE102018216216A1 (de) | 2018-09-24 | 2020-03-26 | Thyssenkrupp Ag | Verfahren zur Verbesserung der Phosphatierbarkeit von metallischen Oberflächen, welche mit einer temporären Vor- bzw. Nachbehandlung versehen werden |
DE102018216317A1 (de) | 2018-09-25 | 2020-03-26 | Thyssenkrupp Ag | Verfahren zur Modifikation von feuerverzinkten Oberflächen |
NL2022279B1 (en) * | 2018-12-21 | 2020-07-15 | Aquacare Europe B V | Method for patinating zinc surfaces and system therefor |
DE102019204224A1 (de) * | 2019-03-27 | 2020-10-01 | Thyssenkrupp Steel Europe Ag | Verfahren zur Neukonditionierung von feuerverzinkten Oberflächen |
DE102019107933A1 (de) | 2019-03-27 | 2020-10-01 | Thyssenkrupp Steel Europe Ag | Verfahren zur Modifizierung der Oberfläche einer auf einem Stahlflachprodukt aufgebrachten metallischen Schutzschicht auf Zn-Al-Mg-Basis und Stahlflachprodukt |
US11905579B1 (en) * | 2019-09-30 | 2024-02-20 | Thyssenkrupp Steel Europe Ag | Sheet steel having a deterministic surface structure |
DE102019215051A1 (de) * | 2019-09-30 | 2021-04-01 | Thyssenkrupp Steel Europe Ag | Stahlblech mit einer deterministischen Oberflächenstruktur |
DE102019134298A1 (de) | 2019-12-13 | 2021-06-17 | Thyssenkrupp Steel Europe Ag | Verfahren zum Herstellen eines Stahlflachprodukts mit einer metallischen Schutzschicht auf Basis von Zink und einer auf einer Oberfläche der metallischen Schutzschicht erzeugten Phosphatierschicht und derartiges Stahlflachprodukt |
DE102020202171A1 (de) | 2020-02-20 | 2021-08-26 | Thyssenkrupp Steel Europe Ag | Verfahren zur Herstellung eines oberflächenveredelten Stahlblechs und oberflächenveredeltes Stahlblech |
DE102021105210A1 (de) | 2021-03-04 | 2022-09-08 | Thyssenkrupp Steel Europe Ag | Oberflächenmodifikation von metallischen Beschichtung auf Basis von Zink im Feuerbeschichtungsprozess |
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CN1119948C (zh) * | 2000-07-17 | 2003-09-03 | 陈永明 | 海藻净型菜食品及其生产方法 |
JP3302680B2 (ja) * | 2000-12-21 | 2002-07-15 | 日新製鋼株式会社 | 耐食性に優れた鋼切板 |
CN1276990C (zh) * | 2002-07-24 | 2006-09-27 | 日新制钢株式会社 | 光泽保持性能优异的热浸镀锌薄钢板及其制备方法 |
DE102004052482A1 (de) | 2004-10-28 | 2006-05-11 | Thyssenkrupp Steel Ag | Verfahren zum Herstellen eines korrosionsgeschützten Stahlblechs |
DE102006035660B4 (de) * | 2006-07-31 | 2009-08-20 | Voestalpine Stahl Gmbh | Korrosionsschutzschicht mit verbesserten Eigenschaften und Verfahren zu ihrer Herstellung |
DE102006052919A1 (de) | 2006-11-08 | 2008-05-15 | Henkel Kgaa | Zr-/Ti-haltige Phosphatierlösung zur Passivierung von Metallverbundoberflächen |
DE102007013739B3 (de) * | 2007-03-22 | 2008-09-04 | Voestalpine Stahl Gmbh | Verfahren zum flexiblen Walzen von beschichteten Stahlbändern |
DE102008056844A1 (de) * | 2008-11-12 | 2010-06-02 | Voestalpine Stahl Gmbh | Manganstahlband und Verfahren zur Herstellung desselben |
MY171037A (en) * | 2011-08-24 | 2019-09-23 | Nippon Steel Corp | Painted plated-steel |
-
2013
- 2013-07-12 EP EP13176397.1A patent/EP2824213A1/de not_active Withdrawn
-
2014
- 2014-07-11 ES ES14744292T patent/ES2727870T3/es active Active
- 2014-07-11 MX MX2016000256A patent/MX2016000256A/es unknown
- 2014-07-11 US US14/904,618 patent/US9920430B2/en active Active
- 2014-07-11 CN CN201480039729.8A patent/CN105492646B/zh active Active
- 2014-07-11 EP EP14744292.5A patent/EP3019639B1/de active Active
- 2014-07-11 WO PCT/EP2014/064987 patent/WO2015004284A1/de active Application Filing
-
2016
- 2016-01-04 ZA ZA2016/00018A patent/ZA201600018B/en unknown
Non-Patent Citations (1)
Title |
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See references of WO2015004284A1 * |
Also Published As
Publication number | Publication date |
---|---|
ES2727870T3 (es) | 2019-10-21 |
EP3019639B1 (de) | 2019-02-27 |
WO2015004284A1 (de) | 2015-01-15 |
CN105492646A (zh) | 2016-04-13 |
CN105492646B (zh) | 2018-01-30 |
US20160160357A1 (en) | 2016-06-09 |
ZA201600018B (en) | 2017-04-26 |
EP2824213A1 (de) | 2015-01-14 |
US9920430B2 (en) | 2018-03-20 |
MX2016000256A (es) | 2016-04-28 |
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