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WO2020109931A1 - Injection de fil métallique dans un bain de galvanisation - Google Patents

Injection de fil métallique dans un bain de galvanisation Download PDF

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Publication number
WO2020109931A1
WO2020109931A1 PCT/IB2019/059977 IB2019059977W WO2020109931A1 WO 2020109931 A1 WO2020109931 A1 WO 2020109931A1 IB 2019059977 W IB2019059977 W IB 2019059977W WO 2020109931 A1 WO2020109931 A1 WO 2020109931A1
Authority
WO
WIPO (PCT)
Prior art keywords
molten metal
metal alloy
coating
alloy bath
composition
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.)
Ceased
Application number
PCT/IB2019/059977
Other languages
English (en)
Inventor
Matthieu DIDIER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ArcelorMittal SA
Original Assignee
ArcelorMittal SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ArcelorMittal SA filed Critical ArcelorMittal SA
Publication of WO2020109931A1 publication Critical patent/WO2020109931A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/06—Zinc or cadmium or alloys based thereon
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/04—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor characterised by the coating material
    • C23C2/12—Aluminium 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
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/51—Computer-controlled implementation
    • 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
    • C23C2/50—Controlling or regulating the coating processes
    • C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
    • C23C2/521—Composition of the bath

Definitions

  • the present invention relates to a method and an equipment permitting to coat a substrate with a coating at a desired composition.
  • vapour deposition In order to coat a substrate, several techniques can be used such as vapour deposition, electroplating or hot-dip.
  • hot-dip a steel strip is passed through a coating tank containing a coating bath. The molten metal adheres to the steel strip and coats it.
  • an intermetallic layer is formed between the coating and the strip. This intermetallic layer and the desired coating have different compositions. Consequently, the formation of this layer engenders a variation in the bath composition.
  • other parameters also affect the stability of the bath composition such as the oxidation at the bath surface and the formation of intermetallic compounds in the bath.
  • Patent EP 2 129 810 discloses a method to keep the initial proportion constant during the deposition by composition adjustment means of the metallic bath comprising means for supplying the evaporation means with molten metal alloy of controlled composition.
  • a composition variation is engendered during the coating due to the different vapor pressure of the components, i.e.: a Mg increase.
  • liquid metal is brought to the crucible to continuously renew the tank.
  • the bath composition of the examples is limited to only two elements because for each desired coating, the corresponding bath composition must be established in function of the different vapour pressures. Consequently, the process is not flexible due to the complexity of finding the right bath composition depending on the vapour pressures and the desired coating. Moreover, taking into account the area coated by the process and the need to do a vacuum, the coating speed of the whole process is limited.
  • the purpose of this invention is to provide a solution solving the aforementioned problems.
  • This object is achieved by providing a method according to claim 1.
  • the method can also comprise any characteristics of claims 2 to 8.
  • This object is also achieved by providing an apparatus according to claims 9 to 11.
  • Figure 1 is a schematic view of an embodiment of a coating installation.
  • Figure 2 is a schematic cross-section view of a substrate, a coating layer and an intermetallic layer.
  • Figure 3 is a schematic view of an embodiment of a coating installation comprising an ingot being fed.
  • Figure 4 is a schematic view of an embodiment of a coating installation comprising a mean controlling the wire addition.
  • Figure 5 is a schematic view of a second embodiment of a coating installation.
  • the invention relates to a method for continuously coating a moving substrate S wherein a coating is continuously deposited on said substrate, by means of
  • a coating installation 1 comprising a coating tank 2
  • said molten metal alloy bath having an initial predetermined composition comprising from 51% to 99% by weight of a first metal and from 1% to 49% by weight of cumulated amounts of at least a second and third metal,
  • the coating installation 1 comprises a coating tank 2, means for passing 4 a substrate S through said molten metal alloy bath 3.
  • the means for conveying 4 a substrate are generally a roll immerged in the molten metal alloy bath and means for conveying the substrate in and out of the bath (not represented).
  • the substrate S is commonly a band or a strip or a wire.
  • the initial predetermined proportion of each metal is kept at more or less 10% of its initial predetermined proportion. It means that for example, if the initial predetermined proportion of a first metal is of 70.0%, its proportion can vary from 63.0% to 77.0% during the course of the coating and that if the predetermined proportion of a second metal is of 20.0%, its proportion can vary from 18% to 22% during the course of the coating.
  • this invention easily and continuously coats a substrate with a predetermined alloy comprising at least three elements, increases the flexibility of the process and the process productivity compared to the state of the art.
  • the strip S passes through the molten metal alloy bath 3, the latter adheres to the strip and forms a desired coating having the same composition as the molten metal alloy bath.
  • a monophasic or multiphasic intermetallic coating 5 having a different composition than the desired coating, can be formed between those two layers (the strip S and the desired coating 6).
  • At least one of the element present in the molten metal alloy bath 3 has a higher concentration in the intermetallic layer 5 than in the molten metal alloy bath 3, such at least one element is considered as an overconsumed element. Even in this case, when at least an intermetallic layer is formed, the coating is considered as being deposited on said substrate.
  • the intermetallic layer and the desired coating will be referred as the coating in the rest of the patent.
  • this intermetallic layer 5 formation leads to a change in the composition of the molten metal alloy bath 3 because of their different composition.
  • other processes and/ or phenomenon such as the oxidation at the metal molten alloy surface and the formation of intermetallic compounds in the bath also have an impact on the bath composition.
  • means permitting to add a defined quantity of the said at least said first, second and/ or third metals into said molten metal alloy bath 3 are used to compensate the composition change of the molten metal alloy bath happening in the course of the strip coating. So, the components proportion delivered by the means permitting to add a defined quantity of the said at least said first, second and/or third metals is different than the molten metal alloy bath composition, e.g.: the overconsumed components proportion is higher in the delivered components than in the molten metal alloy bath.
  • the required quantity of wires to be added can be estimated or modelled using several parameters such as:
  • the defined quantity of at least said first, second and/ or third metals added into the molten metal alloy bath can defined using the estimation of the bath composition and/ or the model of the bath composition. Those quantities are defined such that each metal proportion is kept at more or less 10 % of its initial predetermined proportion in the course of coating.
  • the term“defined” can be understood as“controlled”. Consequently, added quantities of first, second and/ or third metals are controlled and defined.
  • said means permitting to add (7, 8) a defined quantity of said at least said first, second and/ or third metals into said molten metal alloy bath 3 can be wire injectors. Each of them is pulling a metallic wire (9, 10) towards the molten metal alloy bath 3 and thus adding a desired quantity of said metallic wires into the molten metal alloy bath 3.
  • the additions realised by the previously mentioned means must be precise enough to enable a constant maintenance of the bath composition and/ or reach the desired bath composition at all time.
  • the means permitting to add a defined quantity of said metal wires can be controlled manually or automatically.
  • Said metal wires are preferably wounded or coiled around support means (11, 12) such as a spool or a reel or a bobbin.
  • Said support means can be positioned above the tank but are preferably aside because the replacement of the wire coil is thus eased and safer. It is safer and eased because the replacement is not done above the molten metal alloy bath 3.
  • Said metallic wires (9, 10) can be composed of a single element and/ or an alloy of several metallic elements depending on the aimed bath composition.
  • Said metallic wires can also be cored wires made of at least two different metals and/ or alloys.
  • the melting point of the wires is preferably below the molten metal alloy bath temperature. Hence, such a melting point allows a better melting of said wires compared to wires having a melting point above the molten metal alloy bath temperature.
  • the repeated bath composition measurements can be done by analysing frequent punctual bath samples and/or by an on-line continuous measurement device such as a Laser-Induced Breakdown spectroscope.
  • the right amount of the said at least said first, second and/or third added metals is introduced into the molten metal alloy bath based on a predictive model and/ or the repeated bath composition measurements
  • said ingot 13 has a composition close to the predetermined composition of the molten metal alloy bath, less than 5 wt% difference for each element compared to the initial predetermined composition of the molten metal alloy bath.
  • Such an ingot permits to lower the wire consumption of the said at least said first, second and/ or third added metals. In case the added metals are wires, it also eases the wire management because a smaller quantity is used and thus the replacement of the wires is less frequent.
  • the ingot is fed on a side of the tank 2, between the substrate and a tank wall. At least a part of the ingot is immersed into the molten metal alloy bath 3.
  • the ingot lies on a support R, which can be a ramp, and is hold by a holding mean H, which can be a hook, said holding mean can be moved to immerse more or less the ingot.
  • said coating installation comprises a management system 14
  • said means permitting to add a defined quantity of said metal wires are controlled automatically.
  • said first metal is aluminium or zinc.
  • an aluminium based coating enhances the corrosion resistance because it acts as a barrier against the substrate corrosion while a zinc based coating wards off the oxidation.
  • said molten metal alloy bath has an initial predetermined proportion from 70% to 95% by weight of said first metal. It permits to continuously coat on said substrate a layer of metal alloy based on a first metal and comprising a predetermined proportion of said first metal of from 70 to 95% by weight.
  • additional metals are zinc and/or silicon and/or magnesium and/or aluminium.
  • additional metals when added in a certain range can enable the presence of sacrificial cathodic protection on the coated substrate as well as a better LME resistance as it can be seen m WO 2017/017521, WO 2017/017514 and WO 2017/017513.
  • said substrate is a metallic strip. More preferably, said substrate is a steel strip.
  • said metal wires are made of at least one of the following elements: aluminium and/ or zinc and/ or silicon and/ or magnesium. More preferably, metal wire containing aluminium also contains zinc and/ or silicon and/ or magnesium to lower the fusion point in order to facilitate its melting and diffusion into the coating tank.
  • said initial predetermined proportion of each metal is kept at more or less 1% of its initial predetermined proportion. Hence, such a range increases the coating quality because the coating composition is more homogeneous
  • the molten metal alloy bath comprises additional elements chosen from Sr, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Zr or Bi, the content by weight of each additional element being inferior to 0.3% by weight and optionally residuals elements from feeding ingots or from a passage of a steel substrate in the molten bath including iron.
  • the invention also relates to an equipment 1 for continuously coating a substrate S according to the method of claim 1 comprising a coating tank 2 able to contain a molten metallic alloy bath 3 inside said coating tank 2, means for conveying 4 said substrate S through said molten metallic alloy bath 3, two metallic wires (9, 10) of different controlled composition and means permitting to add a defined quantity (7, 8) of said metallic wires into said molten metal alloy bath 3 and measurement means of the molten metal alloy bath composition.
  • said coating installation comprises a management system
  • said equipment comprises three metallic wires of different controlled composition and means permitting to add a defined quantity of said metallic wires into said molten metal alloy bath.
  • said equipment comprises four metallic wires of different controlled composition and means permitting to add a defined quantity of said metallic wires into said molten metal alloy bath.
  • a tank 2’ is filled with a molten metal alloy 3’ and comprises an ingot being fed 13’ into said molten metal alloy. It is desired to produce a coating on the substrate, a steel strip S’, with the same composition as the one of the motel metal alloy.
  • the ingot lies on a ramp R’ and is hold by a hook H’, said hook can be moved to immerse more or less the ingot.
  • Each metallic wire is wound onto a bobbin (IF, 12’ and 17) and only one end of the wire is not wound but goes from the bobbin to the molten metal alloy bath 3’. Said bobbins are not placed directly above the bath but are spaced from it. Hence, such a layout allows the workers to safely walk around the tank and not trip on the wire.
  • Each metallic wire (6’, 7’ and 16) passes by a mean permitting to add (8’, 9’, 18) a defined quantity of metallic wires, a wire injector.
  • Each wire injector is connected to the management system 14’ and can be controlled by the management system 14’.
  • the mean measuring repeatedly the bath composition is a Laser-Induced Breakdown spectroscope 19 connected to the management system 14’.
  • Said management system controls, in function of the bath composition measurement and the prediction model of the bath composition, the quantity of said metallic wires to inject into the bath in order to keep the bath proportion at more or less 0.5 wt% of its initial predetermined proportion in the course of coating

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Coating With Molten Metal (AREA)

Abstract

La présente invention concerne un procédé et un équipement permettant de revêtir un substrat avec une composition souhaitée. Ledit équipement comprend un système de régulation de la composition de bain. Il comprend des moyens d'insertion de fils métalliques ou de fils fourrés dans le bain. Lesdits fils métalliques ou fils fourrés peuvent être constitués d'un seul élément ou d'un alliage de plusieurs éléments. Le système de régulation a recours à au moins une mesure ou estimation moyenne de la composition de bain.
PCT/IB2019/059977 2018-11-30 2019-11-20 Injection de fil métallique dans un bain de galvanisation Ceased WO2020109931A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IBPCT/IB2018/059509 2018-11-30
PCT/IB2018/059509 WO2020109849A1 (fr) 2018-11-30 2018-11-30 Injection de fil

Publications (1)

Publication Number Publication Date
WO2020109931A1 true WO2020109931A1 (fr) 2020-06-04

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PCT/IB2018/059509 Ceased WO2020109849A1 (fr) 2018-11-30 2018-11-30 Injection de fil
PCT/IB2019/059977 Ceased WO2020109931A1 (fr) 2018-11-30 2019-11-20 Injection de fil métallique dans un bain de galvanisation

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PCT/IB2018/059509 Ceased WO2020109849A1 (fr) 2018-11-30 2018-11-30 Injection de fil

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59173256A (ja) * 1983-03-18 1984-10-01 Sumitomo Electric Ind Ltd 連続溶融亜鉛合金めつき方法
US5827576A (en) * 1993-09-08 1998-10-27 Inland Steel Company Hot dip coating method and apparatus
WO2004053184A2 (fr) * 2002-12-09 2004-06-24 Specialty Minerals (Michigan) Inc. Procede pour ajouter du zinc-aluminium solide a des bains de galvanisation
KR20040057746A (ko) * 2002-12-26 2004-07-02 주식회사 포스코 용융도금에서 도금욕 알루미늄 농도의 고정밀 제어방법
EP2129810A1 (fr) 2007-03-20 2009-12-09 ArcelorMittal France Procédé de revêtement d'un substrat et installation de dépôt sous vide d'alliage métallique
WO2017017514A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Procédé de fabrication d'une pièce durcie ne présentant aucun problème de lme
WO2017017521A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Procédé de fabrication d'une pièce apte à la phosphatation à partir d'une tôle d'acier revêtue d'un revêtement métallique à base d'aluminium
WO2017017513A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Tôle d'acier revêtue d'un revêtement métallique à base d'aluminium

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59173256A (ja) * 1983-03-18 1984-10-01 Sumitomo Electric Ind Ltd 連続溶融亜鉛合金めつき方法
US5827576A (en) * 1993-09-08 1998-10-27 Inland Steel Company Hot dip coating method and apparatus
WO2004053184A2 (fr) * 2002-12-09 2004-06-24 Specialty Minerals (Michigan) Inc. Procede pour ajouter du zinc-aluminium solide a des bains de galvanisation
KR20040057746A (ko) * 2002-12-26 2004-07-02 주식회사 포스코 용융도금에서 도금욕 알루미늄 농도의 고정밀 제어방법
EP2129810A1 (fr) 2007-03-20 2009-12-09 ArcelorMittal France Procédé de revêtement d'un substrat et installation de dépôt sous vide d'alliage métallique
WO2017017514A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Procédé de fabrication d'une pièce durcie ne présentant aucun problème de lme
WO2017017521A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Procédé de fabrication d'une pièce apte à la phosphatation à partir d'une tôle d'acier revêtue d'un revêtement métallique à base d'aluminium
WO2017017513A1 (fr) 2015-07-30 2017-02-02 Arcelormittal Tôle d'acier revêtue d'un revêtement métallique à base d'aluminium

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