EP0117958A1 - Process and apparatus for making metallic composite coatings on metallic strips - Google Patents

Process and apparatus for making metallic composite coatings on metallic strips Download PDF

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Publication number
EP0117958A1
EP0117958A1 EP83400345A EP83400345A EP0117958A1 EP 0117958 A1 EP0117958 A1 EP 0117958A1 EP 83400345 A EP83400345 A EP 83400345A EP 83400345 A EP83400345 A EP 83400345A EP 0117958 A1 EP0117958 A1 EP 0117958A1
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Prior art keywords
powder
blowing
metal
box
strip
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EP83400345A
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German (de)
French (fr)
Inventor
Robert Wang
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Fives Stein SA
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Stein Heurtey SA
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Priority to DE198383400345T priority Critical patent/DE117958T1/en
Priority to EP83400345A priority patent/EP0117958A1/en
Publication of EP0117958A1 publication Critical patent/EP0117958A1/en
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • C23C2/265—After-treatment by applying solid particles to the molten coating

Definitions

  • This invention relates to the production of composite metal coatings on metal strips.
  • the metallic coatings can be deposited on the strips to be protected either by dipping or by electrolytic means.
  • the strip In the dip deposition process, the strip is immersed in a bath formed by the molten coating metal.
  • metals capable of constituting a protective coating against corrosion
  • the number of metals that can be used in this way is quite limited. They are essentially tin, lead, zinc, aluminum, or their alloys.
  • the electrolytic deposition technique makes it possible to ensure greater flexibility in the formation of metal coating layers, and to produce protective coatings whose corrosion resistance is greater than that obtained by the deposition technique. soaked.
  • the electrolytic deposition method has the disadvantage of not being able to be associated, directly and in the same installation, with a strip annealing treatment, which is possible in dip metallization installations.
  • the low flexibility and the importance of electrical equipment add to the disadvantages of metallization installations by electrolytic means.
  • the present invention provides a method and a device making it possible to produce such layers of composite coatings in a dip metallization installation.
  • the invention uses known metallic coating deposition techniques applied in continuous metallization lines, for example in galvanizing lines or aluminization lines, as well as techniques, also known, modification of the crystal structure of the coating, after metallization, by blowing finely divided metallic particles in suspension in a gas jet, before the coating freezes.
  • the process which is the subject of this invention is essentially characterized in that the powder of the addition metal suspended in a gas jet is brought into contact with the metal coating deposited on the strip by the technique of continuous quenching, before the coating solidifies, so that the particles of the additive metal powder penetrate into said coating in order to obtain a composite structure giving the strip an increased corrosion resistance compared to that provided by a base coating free of additive metal .
  • the metallization process used in the process according to the invention can be that used in many continuous galvanizing lines.
  • this process pulverulent particles of zinc suspended in a carrier gas are blown on the surface of a sheet coming out of a galvanizing bath, in order to obtain a freezing of the zinc on this surface .
  • the process object of this invention makes independent the blowing of the powder of the additive metal and the solidification of the coating which may occur after passage through the apparatus.
  • the method according to the invention applies in particular to the addition of nickel powder or nickel alloys to a coating of zinc or zinc alloys. It also applies to the addition of nickel to a zinc coating produced in the form of an iron-zinc alloy.
  • the concentration of the powder of addition metal deposited in the base coating is between 0.1 and 15% of this coating, and preferably between 0.5 and 3%.
  • the particle size of the addition metal powder deposited in the base coating is between 0.5 and 20 microns, and preferably between 1 and 5 microns.
  • sheets were produced with the addition of nickel powder on an industrial galvanizing line.
  • the manufacturing conditions were as follows:
  • the invention is not limited to the example above, and it can be applied to combinations of different elements which can constitute both the base coating and the addition metal, it being understood that the addition metal melts at a higher temperature than the coating metal.
  • the invention also relates to a device for implementing the method specified above.
  • This device is characterized in that it comprises: a box produced by the assembly of two symmetrical casings delimiting between them a vertical passage in which the strip provided with the base coating deposited by dipping circulates continuously; slits or groups of blowing orifices provided in said box, in order to inject the powder of addition metal suspended in a gas jet on the surface of the strip provided with the base coating, this blowing preferably being carried out in a direction substantially perpendicular to the strip; a recirculation fan supplying said slots or groups of blowing orifices; slits or groups of return orifices, provided in said box to collect the gas still charged with metal powder to direct it towards the suction of the recirculation fan, where a metering means adds the quantity of metal powder necessary to be blown on the covering, and an aerodynamic seal provided at each end of said box, to prevent the recirculated gas, charged with powder of the addition metal, from escaping towards the outside.
  • the two symmetrical housings constituting the box of the device, these housings being arranged so as to provide a substantially vertical passage 12, in which the strip B provided with the coating passes continuously. base deposited by a dip process.
  • the installation comprises a recirculation fan 14 supplying slots such as 16, 16 1 or groups of circular blowing orifices, on the strip B, of gas holding in suspension the particles of the addition metal, for example of the nickel powder, the blowing preferably taking place in a direction substantially perpendicular to the strip.
  • the slots or groups of blowing orifices 16, 16 1 are situated at the ends of the blowing box.
  • the blowing box is further provided with slots or groups of circular return orifices, such as 18, 18 ′, which collect the gas still charged with metal powder to direct it towards the suction of the recirculation fan 14.
  • On the return line 20 opens a powder supply line 22, providing the quantity of metal powder required to be blown onto the coating of the strip B.
  • the device comprises a hopper 26 for storing the powder of the addition metal, and a powder metering device 24.
  • the slots or groups of return orifices 18, 18 ′ are located in the central part of the box.
  • an aerodynamic seal 28, 28 ′ is provided at each end of the housings 10-10 ′ of the box to prevent the recirculated gas, loaded with metal powder, from escaping towards the outside of the box.
  • These aerodynamic seals 28, 28 1 are produced in the form of blowing slots ensuring the projection at high speed of fresh gas against the strip B, these slots being supplied by a fan 30.
  • this leak is obtained by a valve 32, a filter 34 being provided on the exhaust of this valve in order to collect the particles of metallic powder whose gas is charged before the evacuation of the latter towards the outside.
  • FIG 2 illustrates another embodiment of the device according to the invention.
  • This variant is identical to the device described above with reference to Figure 1, with the exception of the arrangement of the blowing and return slots.
  • the slots or groups of blowing openings 36-36 ' are located in the center of the box, and the slots or groups of return ports 38-38' are placed at the ends of this box.
  • the arrangement of the groups of blowing orifices 36, 36 'and of the return slots 38, 38' is the same as in the embodiment illustrated in FIG. 2; however, separate fans are used here for supply and return air.
  • the installation comprises a blowing fan 40, supplied with powder of addition metal by the hopper 26 and the metering system 24, and a return fan 42, on the outlet of which is mounted a filter 34 '.
  • the return fan has a flow rate equal to or greater than the flow rate of the supply fan.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

The apparatus comprises: a casing consisting of two symmetrical housings (10-10') between which the strip (B) provided with a base coating deposited by dipping travels continuously; slots or groups of blowing orifices (16-16') arranged in the said casing in order to blow in a metal additive powder in suspension in a gas jet onto the surface of the strip provided with the base coating, a recirculation fan (14) feeding the said slots or groups of blowing orifices; slots or groups of uptake orifices (18,18') provided in the said casing to collect the gas still carrying metal powder, in order to direct it towards the suction of the recirculating fan, where a means of metering (24,26) adds the necessary quantity of metal powder which is to be blown onto the strip, and an aerodynamic seal (28-28') provided at each end of the casing to prevent the recirculated gas carrying metal powder from escaping out. <IMAGE>

Description

Cette invention traite de la production de revêtements métalliques composites sur des bandes métalliques.This invention relates to the production of composite metal coatings on metal strips.

Il est connu que la résistance des bandes d'acier contre la corrosion peut être améliorée en y déposant des couches de protection constituées par des revêtements de matières organiques ou métalliques. Généralement, ces revêtements sont déposés en continu à l'aide d'installations appropriées.It is known that the resistance of steel strips against corrosion can be improved by depositing protective layers constituted by coatings of organic or metallic materials. Generally, these coatings are deposited continuously using appropriate facilities.

Les revêtements métalliques peuvent être déposés sur les bandes à protéger soit au trempé, soit par voie électrolytique.The metallic coatings can be deposited on the strips to be protected either by dipping or by electrolytic means.

Dans le procédé de dépôt au trempé, la bande est plongée dans un bain constitué par le métal de revêtement fondu. Compte tenu des températures de fusion des métaux susceptibles de constituer un revêtement protecteur contre la corrosion, le nombre des métaux pouvant être ainsi utilisés est assez restreint. Il s'agit essentiellement de l'étain, du plomb, du zinc, de l'aluminium, ou de leurs alliages.In the dip deposition process, the strip is immersed in a bath formed by the molten coating metal. Given the melting temperatures of metals capable of constituting a protective coating against corrosion, the number of metals that can be used in this way is quite limited. They are essentially tin, lead, zinc, aluminum, or their alloys.

Dans la mise en oeuvre du procédé de dépôt du revêtement protecteur par voie électrolytique, on peut faire appel à des métaux de revêtement présentant une température de fusion plus élevée, et qui apportent une protection contre la corrosion plus efficace que celle apportée par les métaux de revêtement énumérés ci-dessus. Parmi les métaux utilisables pour un dépôt électrolytique, on peut citer notamment le nickel ou le chrome. Ce procédé permet en outre de constituer des couches de revêtements à plusieurs composants superposés, ou intimement mélangés, à l'intérieur desdites couches.In the implementation of the process of depositing the protective coating by electrolytic means, it is possible to use coating metals having a higher melting temperature, and which provide more effective protection against corrosion than that provided by the metals of coating listed above. Among the metals usable for electrolytic deposition, mention may in particular be made of nickel or chromium. This method also makes it possible to form layers of coatings with several components superimposed, or intimately mixed, inside said layers.

On comprend que la technique du dépôt par voie électrolytique permet d'assurer une plus grande souplesse dans la formation des couches de revêtement métallique, et de réaliser des revêtements protecteurs dont la résistance à la corrosion est supérieure à celle obtenue par la technique de dépôt au trempé. Cependant, le procédé de dépôt par voie électrolytique présente l'inconvénient de ne pas pouvoir être associé, directement et dans une même installation, à un traitement de recuit de bande, ce qui est possible dans les installations de métallisation au trempé. Par ailleurs, la faible flexibilité et l'importance des équipements électriques s'ajoutent aux inconvénients que présentent les installations de métallisation par voie électrolytique.It is understood that the electrolytic deposition technique makes it possible to ensure greater flexibility in the formation of metal coating layers, and to produce protective coatings whose corrosion resistance is greater than that obtained by the deposition technique. soaked. However, the electrolytic deposition method has the disadvantage of not being able to be associated, directly and in the same installation, with a strip annealing treatment, which is possible in dip metallization installations. In addition, the low flexibility and the importance of electrical equipment add to the disadvantages of metallization installations by electrolytic means.

Il résulte de ce qui précède que le besoin se fait actuellement sentir de disposer de systèmes associant une technologie de revêtement au trempé à des moyens permettant de réaliser des couches de revêtement contenant des éléments présentant une température de fusion élevée et assurant, de ce fait, une résistance à la corrosion accrue. En conséquence, la présente invention apporte un procédé et un dispositif permettant de réaliser de telles couches de revêtements composites dans une installation de métallisation au trempé.It follows from the above that the need is currently felt to have systems associating a coating technology with dipping and means making it possible to produce coating layers containing elements having a high melting temperature and thus ensuring, increased corrosion resistance. Consequently, the present invention provides a method and a device making it possible to produce such layers of composite coatings in a dip metallization installation.

L'invention fait appel à des techniques de dépôt de revêtements métalliques connues et appliquées dans les lignes de métallisation en continu, par exemple dans les lignes de galvanisation ou les lignes d'alumini- sation, ainsi qu'à des techniques, également connues, de modification de la structure cristalline du revêtement, après métallisation, par soufflage de particules métalliques finement divisées en suspension dans un jet de gaz, avant le figeage du revêtement.The invention uses known metallic coating deposition techniques applied in continuous metallization lines, for example in galvanizing lines or aluminization lines, as well as techniques, also known, modification of the crystal structure of the coating, after metallization, by blowing finely divided metallic particles in suspension in a gas jet, before the coating freezes.

Le procédé objet de cette invention est essentiellement caractérisé en ce que la poudre du métal d'addition en suspension dans un jet gazeux est mise au contact du revêtement métallique déposé sur la bande par la technique du trempé continu, avant la solidification de ce revêtement, de manière que les particules de la poudre de métal d'addition pénètrent dans ledit revêtement afin d'obtenir une structure composite donnant à la bande une résistance à la corrosion accrue par rapport à celle procurée par un revêtement de base exempt de métal d'addition.The process which is the subject of this invention is essentially characterized in that the powder of the addition metal suspended in a gas jet is brought into contact with the metal coating deposited on the strip by the technique of continuous quenching, before the coating solidifies, so that the particles of the additive metal powder penetrate into said coating in order to obtain a composite structure giving the strip an increased corrosion resistance compared to that provided by a base coating free of additive metal .

La procédé de métallisation utilisé dans le procédé selon l'invention peut être celui mis en oeuvre dans de nombreuses lignes de galvanisation en continu. En ce qui concerne la technique de dépôt du métal d'addition pour modifier la structure cristalline du revêtement déposé au trempé, on peut faire appel au procédé dit de "minifleurage", décrit dans le brevet français n° 1 446 335 et dans le brevet américain n° 4 111 154. Selon ce procédé, on souffle des particules pulvérulentes de zinc en suspension dans un gaz porteur sur la surface d'une tôle sortant d'un bain de galvanisation, afin d'obtenir un figeage du zinc sur cette surface. Cependant, contrairement au procédé de minifleurage à poudre de zinc, qui exige que le revêtement soit figé avant de quitter le dispositif, le procédé objet de cette invention rend indépendants 1 e soufflage de la poudre du métal d'addition et la solidification du revêtement qui peut se produire après le passage dans l'appareillage.The metallization process used in the process according to the invention can be that used in many continuous galvanizing lines. With regard to the technique of depositing the addition metal to modify the crystalline structure of the coating deposited by dipping, it is possible to use the process known as "miniflowering", described in French patent n ° 1 446 335 and in the patent. American No. 4,111,154. According to this process, pulverulent particles of zinc suspended in a carrier gas are blown on the surface of a sheet coming out of a galvanizing bath, in order to obtain a freezing of the zinc on this surface . However, unlike the zinc powder miniflower process, which requires that the coating be frozen before leaving the device, the process object of this invention makes independent the blowing of the powder of the additive metal and the solidification of the coating which may occur after passage through the apparatus.

Le procédé selon l'invention s'applique en particulier à l'addition de poudre de nickel ou d'alliages de nickel à un revêtement de zinc ou d'alliages de zinc. Il s'applique également à l'addition de poudre de nickel à un revêtement de zinc réalisé sous la forme d'un alliage fer-zinc.The method according to the invention applies in particular to the addition of nickel powder or nickel alloys to a coating of zinc or zinc alloys. It also applies to the addition of nickel to a zinc coating produced in the form of an iron-zinc alloy.

Selon une caractéristique de cette invention, la concentration de la poudre de métal d'addition déposée dans le revêtement de base est comprise entre 0, 1 et 15% de ce revêtement, et de préférence entre 0, 5 et 3%.According to a characteristic of this invention, the concentration of the powder of addition metal deposited in the base coating is between 0.1 and 15% of this coating, and preferably between 0.5 and 3%.

Selon une autre caractéristique de cette invention, la granulométrie de la poudre de métal d'addition déposée dans le revêtement de base est comprise entre 0, 5 et 20 microns, et de préférence entre 1 et 5 microns.According to another characteristic of this invention, the particle size of the addition metal powder deposited in the base coating is between 0.5 and 20 microns, and preferably between 1 and 5 microns.

Selon l'invention, et à titre d'exemple non limitatif, on a produit des tôles avec l'addition de poudre de nickel sur une ligne de galvanisation industrielle. Les conditions de fabrication ont été les suivantes :

Figure imgb0001
According to the invention, and by way of nonlimiting example, sheets were produced with the addition of nickel powder on an industrial galvanizing line. The manufacturing conditions were as follows:
Figure imgb0001

Le revêtement caractéristique obtenu par le procédé selon l'invention contient principalement la phase il (êta) de zinc avec les cristaux d'alliage fer-zinc à l'interface acier-revêtement. Le métal d'addition (du nickel, dans l'exemple considéré) est présent dans tout le revêtement, aux joints de grains de la phase η de zinc. Il présente un accroissement de concentration au voisinage de la surface du revêtement. Cet accroissement conduit à l'amélioration de la tenue du revêtement à la corrosion accélérée dans le brouillard salin. Les essais sur les échantillons produits dans les conditions spécifiées ci-dessus ont donné les résultats suivants :

  • - tenue au brouillard salin (essai suivant la norme AFNOR NFA 41002) du revêtement sans addition de nickel ................. 240 heures
  • - tenue du revêtement de même poids avec addition de nickel..694 heures
The characteristic coating obtained by the process according to the invention mainly contains the zinc phase (eta) with the iron-zinc alloy crystals at the steel-coating interface. The addition metal (nickel, in the example considered) is present throughout the coating, at the grain boundaries of the η zinc phase. It shows an increase in concentration near the surface of the coating. This increase leads to an improvement in the resistance of the coating to accelerated corrosion in salt spray. The tests on the samples produced under the conditions specified above gave the following results:
  • - resistance to salt spray (test according to AFNOR standard NFA 41002) of the coating without addition of nickel ................. 240 hours
  • - holding of the same weight coating with the addition of nickel..694 hours

Bien entendu, l'invention n'est pas limitée à l'exemple ci-dessus, et elle peut s'appliquer à des combinaisons de différents éléments pouvant constituer à la fois le revêtement de base et le métal d'addition, étant entendu que le métal d'addition fond à une température plus élevée que le métal de revêtement.Of course, the invention is not limited to the example above, and it can be applied to combinations of different elements which can constitute both the base coating and the addition metal, it being understood that the addition metal melts at a higher temperature than the coating metal.

L'invention concerne également un dispositif pour la mise en oeuvre du procédé spécifié ci-dessus.The invention also relates to a device for implementing the method specified above.

Ce dispositif est caractérisé en ce qu'il comprend : un caisson réalisé par l'assemblage de deux carter symétriques délimitant entre eux un passage vertical dans lequel circule en continu la bande munie du revêtement de base déposé au trempé ; des fentes ou des groupes d'orifices de soufflage ménagés dans ledit caisson, afind'insuffler la poudre de métal d'addition en suspension dans un jet gazeux sur la surface de la bande munie du revêtement de base, ce soufflage s'effectuant de préférence selon une direction sensiblement perpendiculaire à la bande ; un ventilateur de recirculation alimentant lesdites fentes ou groupes d'orifices de soufflage ; des fentes ou groupes d'orifices de reprise, prévues dans ledit caisson pour recueillir le gaz encore chargé de poudre métallique pour le diriger vers l'aspiration du ventilateur de recirculation, où un moyen de dosage ajoute la quantité de poudre métallique nécessaire devant être soufflée sur le revêtement, et-un joint aérodynamique prévu à chaque extrémité dudit caisson, pour empêcher le gaz recirculé, chargé de poudre du métal d'addition, de s'échapper vers l'extérieur.This device is characterized in that it comprises: a box produced by the assembly of two symmetrical casings delimiting between them a vertical passage in which the strip provided with the base coating deposited by dipping circulates continuously; slits or groups of blowing orifices provided in said box, in order to inject the powder of addition metal suspended in a gas jet on the surface of the strip provided with the base coating, this blowing preferably being carried out in a direction substantially perpendicular to the strip; a recirculation fan supplying said slots or groups of blowing orifices; slits or groups of return orifices, provided in said box to collect the gas still charged with metal powder to direct it towards the suction of the recirculation fan, where a metering means adds the quantity of metal powder necessary to be blown on the covering, and an aerodynamic seal provided at each end of said box, to prevent the recirculated gas, charged with powder of the addition metal, from escaping towards the outside.

D'autres caractéristiques et avantages de cette invention ressortiront de la description faite ci-après, en référence aux dessins annexés, qui illustrent, à titre d'exemples non limitatif, trois exemples de réalisation d'installations selon l'invention. Sur les dessins, les figures 1 à 3 sont des vues schématiques illustrant ces installations.Other characteristics and advantages of this invention will emerge from the description given below, with reference to the appended drawings, which illustrate, by way of nonlimiting examples, three exemplary embodiments of installations according to the invention. In the drawings, Figures 1 to 3 are schematic views illustrating these installations.

On se réfère en premier lieu à la figure 1.We first refer to Figure 1.

Sur cette figure, on a représenté schématiquement, en 10 et 10', les deux carters symétriques constituant le caisson du dispositif, ces carters étant disposés de façon à ménager un passage sensiblement vertical 12, dans lequel passe en continu la bande B pourvue du revêtement de base déposé par un procédé au trempé. L'installation comprend un ventilateur de recirculation 14 alimentant des fentes telles que 16, 161 ou des groupes d'orifices circulaires de soufflage, sur la bande B, du gaz tenant en suspension les particules du métal d'addition, par exemple de la poudre de nickel, le soufflage s'effectuant de préférence selon une direction sensiblement perpendiculaire à la bande Dans cet exemple de réalisation, les fentes ou groupes d'orifices de soufflage 16, 161 sont situés aux extrémités du caisson de soufflageIn this figure, there is shown schematically, at 10 and 10 ′, the two symmetrical housings constituting the box of the device, these housings being arranged so as to provide a substantially vertical passage 12, in which the strip B provided with the coating passes continuously. base deposited by a dip process. The installation comprises a recirculation fan 14 supplying slots such as 16, 16 1 or groups of circular blowing orifices, on the strip B, of gas holding in suspension the particles of the addition metal, for example of the nickel powder, the blowing preferably taking place in a direction substantially perpendicular to the strip. In this embodiment, the slots or groups of blowing orifices 16, 16 1 are situated at the ends of the blowing box.

Le caisson de soufflage est en outre pourvu de fentes ou de groupes d'orifices circulaires de reprise, tels que 18, 18', qui recueillent le gaz encore chargé de poudre métallique pour le diriger vers l'aspiration du ventilateur de recirculation 14. Sur la conduite de reprise 20 vient déboucher une conduite d'alimentation en poudre 22, apportant la quantité de poudre métallique nécessaire devant être soufflée sur le revêtement de la bande B. A cet effet, le dispositif comprend une trémie 26 de stockage de la poudre du métal d'addition, et un doseur de poudre 24. Dans l'exemple de réalisation représenté sur la figure 1, les fentes ou groupes d'orifices de reprise 18, 18' sont situés dans la partie centrale du caisson.The blowing box is further provided with slots or groups of circular return orifices, such as 18, 18 ′, which collect the gas still charged with metal powder to direct it towards the suction of the recirculation fan 14. On the return line 20 opens a powder supply line 22, providing the quantity of metal powder required to be blown onto the coating of the strip B. For this purpose, the device comprises a hopper 26 for storing the powder of the addition metal, and a powder metering device 24. In the embodiment shown in FIG. 1, the slots or groups of return orifices 18, 18 ′ are located in the central part of the box.

On prévoit en outre, à chaque extrémité des carters 10-10' du caisson, un joint aérodynamique 28, 28', respectivement, pour empêcher le gaz recirculé, chargé de poudre métallique, de s'échapper vers l'extérieur du caisson. Ces joints aérodynamiques 28, 281 sont réalisés sous la forme de fentes de soufflage assurant la projection à grande vitesse de gaz frais contre la bande B, ces fentes étant alimentées par un ventilateur 30.In addition, at each end of the housings 10-10 ′ of the box, an aerodynamic seal 28, 28 ′, respectively, is provided to prevent the recirculated gas, loaded with metal powder, from escaping towards the outside of the box. These aerodynamic seals 28, 28 1 are produced in the form of blowing slots ensuring the projection at high speed of fresh gas against the strip B, these slots being supplied by a fan 30.

Selon l'invention, on prévoit une fuite de gaz soufflé avant son arrivée au caisson de soufflage, dans le système de recirculation, afin de mieux maîtriser l'étanchéité du dispositif par rapport à l'air ambiant, la fuite étant compensée par une admission d'air frais dans le système de recirculation. Dans cet exemple de réalisation, cette fuite est obtenue par une vanne 32, un filtre 34 étant prévu sur l'échappement de cette vanne afin de recueillir les particules de poudre métallique dont le gaz est chargé avant l'évacuation de ce dernier vers l'extérieur.According to the invention, provision is made for a leak of blown gas before it arrives at the blowing box, in the recirculation system, in order to better control the tightness of the device with respect to ambient air, the leak being compensated by an admission fresh air in the recirculation system. In this exemplary embodiment, this leak is obtained by a valve 32, a filter 34 being provided on the exhaust of this valve in order to collect the particles of metallic powder whose gas is charged before the evacuation of the latter towards the outside.

On se réfère maintenant à la figure 2, qui illustre un autre exemple de réalisation du dispositif selon l'invention. Cette variante est identique au dispositif décrit ci-dessus en référence à la figure 1, à l'exception de la disposition des fentes de soufflage et de reprise. Dans cet exemple d'exécution, les fentes ou groupes d'orifices de soufflage 36-36' sont situés au centre du caisson, et les fentes ou groupes d'orifices de reprise 38-38' sont placés aux extrémités de ce caisson.Referring now to Figure 2, which illustrates another embodiment of the device according to the invention. This variant is identical to the device described above with reference to Figure 1, with the exception of the arrangement of the blowing and return slots. In this embodiment, the slots or groups of blowing openings 36-36 'are located in the center of the box, and the slots or groups of return ports 38-38' are placed at the ends of this box.

Dans l'exemple de réalisation représenté sur la figure 3, la disposition des groupes d'orifices de soufflage 36, 36' et des fentes de reprise 38, 38' est la même que dans le mode de réalisation illustré par la figure 2 ; cependant, on utilise ici des ventilateurs séparés pour le soufflage et pour le reprise. En effet, l'installation comporte un ventilateur de soufflage 40, alimenté en poudre de métal d'addition par la trémie 26 et le système doseur 24, et un ventilateur de reprise 42, sur la sortie duquel est monté un filtre 34'. Le ventilateur de reprise dispose d'un débit égal ou supérieur au débit du ventilateur de soufflage.In the embodiment shown in FIG. 3, the arrangement of the groups of blowing orifices 36, 36 'and of the return slots 38, 38' is the same as in the embodiment illustrated in FIG. 2; however, separate fans are used here for supply and return air. Indeed, the installation comprises a blowing fan 40, supplied with powder of addition metal by the hopper 26 and the metering system 24, and a return fan 42, on the outlet of which is mounted a filter 34 '. The return fan has a flow rate equal to or greater than the flow rate of the supply fan.

On peut, bien sûr, sans sortir du cadre de cette invention, envisager d'autres dispositions et arrangements relatifs des fentes ou orifices de soufflage et de reprise, des ventilateurs, des filtres, etc. , ainsi que l'utilisation du procédé dans l'ambiance du gaz protecteur.One can, of course, without departing from the scope of this invention, consider other provisions and arrangements relating to the blowing or return slots or orifices, fans, filters, etc. , as well as the use of the process in the atmosphere of the protective gas.

Claims (9)

1 - Procédé pour la réalisation de revêtements métalliques composites sur une bande métallique, caractérisé en ce qu'il consiste à mettre en contact un revêtement métallique, déposé sur la bande par la technique du trempé en continu avant la solidification dudit revêtement métallique, avec une poudre d'un métal d'addition en suspension dans un jet gazeux, la température de fusion de la poudre du métal d'addition étant supérieure à celle du métal du revêtement de base, de manière que les particules de la poudre de métal d'addition pénètrent dans ledit revêtement, afin d'obtenir une structure composite, donnant à la bande une résistance à la corrosion accrue par rapport à celle procurée par un revêtement de base exempt de métal d'addition.1 - Process for producing composite metallic coatings on a metallic strip, characterized in that it consists in bringing a metallic coating into contact, deposited on the strip by the technique of continuous dipping before the solidification of said metallic coating, with a powder of an addition metal suspended in a gas jet, the melting temperature of the powder of the addition metal being higher than that of the metal of the base coating, so that the particles of the powder of metal addition penetrate into said coating, in order to obtain a composite structure, giving the strip an increased corrosion resistance compared to that provided by a base coating free of addition metal. 2 - Procédé selon la revendication 1, caractérisé en ce que la concentration de la poudre du métal d'addition déposée dans le revêtement de base est comprise entre 0, 1 et 15%, et de préférence entre 0, 5 et 3% du revêtement de base.2 - Method according to claim 1, characterized in that the concentration of the powder of the addition metal deposited in the base coating is between 0, 1 and 15%, and preferably between 0, 5 and 3% of the coating basic. 3 - Procédé selon l'une des revendications 1 et 2, caractérisé en ce que la granulométrie de la poudre du métal d'addition déposée dans le revêtement de base est comprise entre 0, 5 et 20 microns, et de préférence entre 1 et 5 microns.3 - Method according to one of claims 1 and 2, characterized in that the particle size of the powder of the addition metal deposited in the base coating is between 0, 5 and 20 microns, and preferably between 1 and 5 microns. 4 - Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le métal d'addition est de la poudre de nickel ou des alliages de nickel, et en ce que le revêtement de base est constitué de zinc, d'alliages de zinc et d'aluminium, ou d'un alliage fer-zinc.4 - Method according to any one of claims 1 to 3, characterized in that the addition metal is nickel powder or nickel alloys, and in that the base coating consists of zinc, zinc and aluminum alloys, or an iron-zinc alloy. 5 - Dispositif pour la mise en oeuvre du procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'il comprend : un caisson réalisé par l'assemblage de deux carters symétriques (10-10'), délimitant entre eux un passage vertical dans lequel circule en continu la bande (B) munie du revêtement de base déposé au trempé ; des fentes ou groupes d'orifices de soufflage (16-161 ; 36, 36') ménagés dans ledit caisson, afin d'insuffler la poudre de métal d'addition en suspension dans un jet gazeux sur la surface de la bande pourvue du revêtement de base, ce soufflage s'effectuant de préférence selon une direction sensiblement perpendiculaire à la bande, un ventilateur de recirculation (14) alimentant lesdites fentes ou groupes d'orifices de soufflage ; des fentes ou groupes d'orifices de reprise (18, 18t ; 38, 38'), prévues dans ledit caisson pour recueillir le gaz encore chargé de poudre métallique, afin de le diriger vers l'aspiration du ventilateur de recirculation, où un moyen de dosage (24, 26) ajoute la quantité de poudre métallique nécessaire devant être soufflée sur la bande, et un joint aérodynamique (28-281), prévu à chaque extrémité du caisson, pour empêcher le gaz recirculé chargé de poudre métallique de s'échapper vers l'extérieur.5 - Device for implementing the method according to any one of the preceding claims, characterized in that it comprises: a box produced by the assembly of two symmetrical casings (10-10 '), delimiting between them a passage vertical in which the strip (B) provided with the base coating deposited by dipping circulates continuously; slots or groups of blowing orifices (16-16 1 ; 36, 36 ') formed in said box, in order to inject the powder of addition metal suspended in a gas jet on the surface of the strip provided with the base coating, this blowing preferably taking place in a direction substantially perpendicular to the strip, a recirculation fan (14) supplying said slots or groups of blowing orifices; slits or groups of return orifices (18, 18 t ; 38, 38 '), provided in said box to collect the gas still charged with metal powder, in order to direct it towards the suction of the recirculation fan, where a metering means (24, 26) adds the quantity of metal powder necessary to be blown onto the strip, and an aerodynamic seal (28-28 1 ), provided at each end of the box, to prevent the recirculated gas charged with metal powder from escape to the outside. 6 - Dispositif selon la revendication 5, caractérisé en ce que les fentes ou groupes d'orifices de soufflage (16, 16') sont disposés aux extrémités du caisson de soufflage, et en ce que les fentes ou groupes d'orifices de reprise (18, 181) sont placés au centre dudit caisson.6 - Device according to claim 5, characterized in that the slots or groups of blowing orifices (16, 16 ') are arranged at the ends of the blowing box, and in that the slits or groups of return orifices ( 18, 18 1 ) are placed in the center of said box. 7 - Dispositif selon la revendication 5, caractérisé en ce que les fentes ou groupes d'orifices de soufflage (36, 36') sont placés au centre du caisson de soufflage, et en ce que les fentes ou groupes d'orifices de reprise (38-38') sont disposés aux extrémités dudit caisson.7 - Device according to claim 5, characterized in that the slots or groups of blowing orifices (36, 36 ') are placed in the center of the blowing box, and in that the slots or groups of return orifices ( 38-38 ') are arranged at the ends of said box. 8 - Dispositif selon l'une quelconque des revendications 5 à 7, caractérisé en ce qu'il comprend une vanne (32) pour créer une fuite dans le circuit de gaz de soufflage avant son arrivée au caisson de soufflage, un système de filtration (34) étant prévu sur l'échappement de ladite vanne.8 - Device according to any one of claims 5 to 7, charac terized in that it comprises a valve (32) for creating a leak in the blowing gas circuit before it arrives at the blowing box, a filtration system (34) being provided on the exhaust of said valve. 9 - Dispositif selon l'une quelconque des revendications 5 à 8, caractérisé en ce qu'il comporte deux ventilateurs : un ventilateur (14) de soufflage du gaz tenant en suspension la poudre du métal d'addition, et un ventilateur (42) pour la reprise dans le caisson des gaz encore chargés de poudre métallique, le débit du ventilateur de reprise étant égal ou supérieur à celui du ventilateur de soufflage.9 - Device according to any one of claims 5 to 8, characterized in that it comprises two fans: a fan (14) for blowing the gas holding in suspension the powder of the addition metal, and a fan (42) for the recovery in the box of gases still charged with metal powder, the flow rate of the recovery fan being equal to or greater than that of the blowing fan.
EP83400345A 1983-02-18 1983-02-18 Process and apparatus for making metallic composite coatings on metallic strips Withdrawn EP0117958A1 (en)

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DE198383400345T DE117958T1 (en) 1983-02-18 1983-02-18 METHOD AND DEVICE FOR PRODUCING METAL COMPOSITE COATINGS ON METAL STRIPS.
EP83400345A EP0117958A1 (en) 1983-02-18 1983-02-18 Process and apparatus for making metallic composite coatings on metallic strips

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155530A (en) * 1959-05-25 1964-11-03 Armco Steel Corp Process for producing protected metal surfaces
FR1446335A (en) * 1965-04-09 1966-07-22 Strasbourg Forges Improvements in the manufacture of products and in particular hot-dip galvanized sheets
FR2065305A5 (en) * 1969-10-09 1971-07-23 British Steel Corp
US4111154A (en) * 1977-04-11 1978-09-05 Heurtey Metallurgie Apparatus for the surface treatment of galvanized sheet-iron
EP0066523A1 (en) * 1981-06-03 1982-12-08 Stein Heurtey Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3155530A (en) * 1959-05-25 1964-11-03 Armco Steel Corp Process for producing protected metal surfaces
FR1446335A (en) * 1965-04-09 1966-07-22 Strasbourg Forges Improvements in the manufacture of products and in particular hot-dip galvanized sheets
FR2065305A5 (en) * 1969-10-09 1971-07-23 British Steel Corp
US4111154A (en) * 1977-04-11 1978-09-05 Heurtey Metallurgie Apparatus for the surface treatment of galvanized sheet-iron
EP0066523A1 (en) * 1981-06-03 1982-12-08 Stein Heurtey Apparatus for the surface treatment of galvanized sheet iron in a confined atmosphere

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* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 92, no. 10, mars 1980, page 256, no. 80479a, Columbus, Ohio, US & JP - A - 54 100 942 (HITACHI SHIPBUILDING AND ENGINEERING CO., LTD.) 09-08-1979 *
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 173, 29 novembre 1980, page 655 C-32 & JP - A - 55 110 766 (SHIN NIPPON) 26-08-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 19, 3 février 1982, page 897 C 90 *

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