EP0117958A1 - Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern - Google Patents

Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern 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
Authority
EP
European Patent Office
Prior art keywords
powder
blowing
metal
box
strip
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP83400345A
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English (en)
French (fr)
Inventor
Robert Wang
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.)
Fives Stein SA
Original Assignee
Stein Heurtey 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 Stein Heurtey SA filed Critical Stein Heurtey SA
Priority to EP83400345A priority Critical patent/EP0117958A1/de
Priority to DE198383400345T priority patent/DE117958T1/de
Publication of EP0117958A1 publication Critical patent/EP0117958A1/de
Withdrawn legal-status Critical Current

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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
    • C23C2/26—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 Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating With Molten Metal (AREA)
EP83400345A 1983-02-18 1983-02-18 Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern Withdrawn EP0117958A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP83400345A EP0117958A1 (de) 1983-02-18 1983-02-18 Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern
DE198383400345T DE117958T1 (de) 1983-02-18 1983-02-18 Verfahren und vorrichtung zur herstellung von metallischen verbundsueberzuegen auf metallbaendern.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83400345A EP0117958A1 (de) 1983-02-18 1983-02-18 Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern

Publications (1)

Publication Number Publication Date
EP0117958A1 true EP0117958A1 (de) 1984-09-12

Family

ID=8191388

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400345A Withdrawn EP0117958A1 (de) 1983-02-18 1983-02-18 Verfahren und Vorrichtung zur Herstellung von metallischen Verbundsüberzügen auf Metallbändern

Country Status (2)

Country Link
EP (1) EP0117958A1 (de)
DE (1) DE117958T1 (de)

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 (fr) * 1965-04-09 1966-07-22 Strasbourg Forges Perfectionnements apportés à la fabrication de produits et notamment de tôles galvanisées à chaud
FR2065305A5 (de) * 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 (de) * 1981-06-03 1982-12-08 Stein Heurtey Vorrichtung zur Oberflächenbehandlung galvanisierter Bleche in einer abgegrenzten Atmosphäre

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 (fr) * 1965-04-09 1966-07-22 Strasbourg Forges Perfectionnements apportés à la fabrication de produits et notamment de tôles galvanisées à chaud
FR2065305A5 (de) * 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 (de) * 1981-06-03 1982-12-08 Stein Heurtey Vorrichtung zur Oberflächenbehandlung galvanisierter Bleche in einer abgegrenzten Atmosphäre

Non-Patent Citations (3)

* 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 *

Also Published As

Publication number Publication date
DE117958T1 (de) 1985-03-07

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