EP0026757A1 - Procédé de zingage à chaud d'articles en fer ou en acier - Google Patents

Procédé de zingage à chaud d'articles en fer ou en acier Download PDF

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Publication number
EP0026757A1
EP0026757A1 EP80890108A EP80890108A EP0026757A1 EP 0026757 A1 EP0026757 A1 EP 0026757A1 EP 80890108 A EP80890108 A EP 80890108A EP 80890108 A EP80890108 A EP 80890108A EP 0026757 A1 EP0026757 A1 EP 0026757A1
Authority
EP
European Patent Office
Prior art keywords
zinc
bath
objects
galvanized
zinc bath
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
Application number
EP80890108A
Other languages
German (de)
English (en)
Other versions
EP0026757B1 (fr
Inventor
Walter Hans
Hans Moschinger
Reiner Spreitzhofer
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.)
Voestalpine AG
Original Assignee
Voestalpine AG
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 Voestalpine AG filed Critical Voestalpine AG
Publication of EP0026757A1 publication Critical patent/EP0026757A1/fr
Application granted granted Critical
Publication of EP0026757B1 publication Critical patent/EP0026757B1/fr
Expired legal-status Critical Current

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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
    • C23C2/04—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
    • C23C2/26—After-treatment
    • C23C2/261—After-treatment in a gas atmosphere, e.g. inert or reducing atmosphere
    • 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
    • C23C2/28—Thermal after-treatment, e.g. treatment in oil bath
    • C23C2/29—Cooling or quenching

Definitions

  • the invention relates to a method for hot-dip galvanizing iron or steel objects, in particular pipes, wires, sheets or the like, in automatic galvanizing plants, in which the objects to be galvanized after degreasing, pickling, rinsing, applying flux and optionally drying, be immersed in a zinc bath and, after being discharged from the zinc bath, blown off and quenched.
  • the required zinc coating in g / m is prescribed especially for use in drinking water pipes. With every zinc coating determination, not only the pure zinc layer of the zinc coating is determined. Rather, all iron-zinc alloy layers occurring through diffusion processes are co-determined in such determinations, and the total zinc coating thus includes all alloy layers in addition to the pure zinc layer.
  • the surfaces of the objects to be galvanized are prepared by pickling, applying fluxes and optionally drying in a drying oven, after which they are introduced into the zinc bath.
  • the zinc bath temperature is usually 450 to 465 ° C. and in the case of steel pipes, a dip in the zinc bath of approximately 120 s is usually maintained. After the pipes have been removed from the zinc bath, they are blown off with compressed air and blown out with steam. Usually due to the required handling time and in order to achieve a smooth and shiny surface, 'takes about 10 s to immerse in the water quenching bath.
  • the water quench bath usually has a temperature of about 50 to 60 ° C.
  • the present invention now aims to keep the zinc consumption, that is to say the amount of zinc taken up from the zinc bath, in order to achieve a certain zinc coating in g / m 2 as low as possible without sacrificing corrosion resistance.
  • the invention further aims to keep the risk of diffusion of iron from the objects to be galvanized into the zinc of the bath as low as possible and also to reduce the zinc consumption in order to achieve a certain zinc coating.
  • the invention essentially consists in that the. galvanizing objects are immersed in the zinc bath until a quantity of zinc / m 2 is absorbed which, after being blown off with air and / or steam, corresponds to a weight per unit area of the zinc coating / m 2 which is less than the desired weight per unit area of the zinc coating / m 2 , that the galvanized objects are kept after the application from the zinc bath at temperatures of above 250 ° C until the zinc coating grows to the desired basis weight / m 2 , an intermetallic zinc-iron alloy layer covering part of the layer thickness of the zinc coating by diffusion of Iron is obtained in the zinc and that the galvanized objects are then quenched in a manner known per se.
  • the immersion time in the zinc bath is selected so that after the blow-off, a quantity of zinc / m 2 remains on the object to be galvanized, which is less than the desired weight per unit area of the zinc coating / m 2 is initially evident Lich that less zinc is removed from the bath by this measure.
  • the dipping time is thus shortened compared to the known methods, and a strong blowing or stripping of the zinc adhering to the surface of the objects to be galvanized can also be achieved by increased blower outputs.
  • the objects are then kept at temperatures above 250 ° C.
  • the articles in the zinc bath are immersed an amount of zinc / m 2 to the recording, which, l a ge / m 2, corresponds to the blowing off with air and / or water vapor at most 95%, preferably about 85% of the desired weight per unit area of the Zinnnie-.
  • the holding time at temperatures above 250 ° C. is preferably such that the zinc coating / m 2 increases by at least 10 % , preferably at least 15%, by alloy formation.
  • the galvanized articles can preferably be kept at temperatures above 250 ° C. after they have been removed from the zinc bath until an intermetallic zinc-iron alloy layer has formed, at least 60%, preferably at least 75%, of the layer thickness of the zinc coating.
  • the formation of the iron-zinc alloy layer may preferably over at least 80%, 'in particular 90%, the layer thickness of the Z iniserlage extend, wherein the upper limit is given merely in that an outermost layer of the zinc coating, preferably with a layer thickness of at most 5 %, the total thickness of the zinc coating which is to be formed from pure zinc, should be retained.
  • the articles are preferably kept at temperatures of above 250 ° C., preferably above 300 ° C., for 10 to 120 s, preferably at least 20 s, in particular 60 to 90 s, after they have been removed from the zinc bath.
  • diving times of 20 to 180 s, preferably 20 to 120 s, are possible, after which the galvanized objects are kept in heated, still air or in a steam atmosphere. It has proven to be particularly advantageous if the holding time at temperatures above 250 ° C. is longer after the objects have been removed from the zinc bath. is measured as the immersion time of the objects in the zinc bath. This ensures minimal zinc consumption.
  • the method is advantageously carried out as wet galvanizing.
  • wet galvanizing for example, pipes with much lower temperatures enter the zinc bath than would be the case after a drying oven. Because diffusions Only use processes at 250 ° C, in this way the time until which diffusion processes in the zinc bath cannot yet take place is extended. The diffusion processes in the bath should be kept as low as possible and only take place outside the zinc bath over the holding time. It is therefore advantageous according to the invention to use a zinc bath with an addition of aluminum in the amount of 0.08 to 0.5, preferably 0.2% by weight, since such addition of aluminum largely suppresses the diffusion processes and thus the alloying in the bath .
  • the process according to the invention thus controls the ratio of the alloy layer to the pure zinc layer when the zinc coating is applied, and the proportion of the alloy layer in the total zinc coating which is substantially higher than known processes saves zinc during the galvanizing process.
  • Pipes of various dimensions were galvanized once without extended alloying times and once with extended holding times after they had been removed from the zinc bath. The increase in the zinc coating in percent was then determined when the holding time was extended outside and inside. The distribution of the zinc coating on the outside and inside of pipes was also determined, and surprisingly, with larger pipe dimensions, the distribution on the outside and inside was evened out. The results are summarized in Table 1 below.
  • Fig. 1 the ratios for a 1/2 inch tube, in Fig. 2 for a 3/4 inch tube, in Fig. 3 for a 6/4 inch tube, in Fig. 4 for a 3 inch tube and in Fig. 5 again shown for a 1/2 inch tube.
  • the zinc coating in g / m2 is plotted on the ordinate and the length of the pipe is plotted on the abscissa, 1 corresponding to the pipe start and 12 to the pipe end.
  • a uniform diving time of 110 s was observed for better comparability.
  • the pull-out speed from the bath was uniformly 0.7 m / s.
  • the curves labeled 1 represent the values for the zinc coating, which were achieved by quenching 12 s after removal from the bath.
  • the solid line shows the values measured on the outside of the pipe, while the corresponding dashed curve shows the values inside the pipe.
  • the sample length was measured uniformly at 500 mm.
  • curves 4 again show the values measured outside and inside after quenching 13 s after being removed from the bath.
  • Curves 5 correspond to the values after a holding time of 60 s, the solid lines in turn corresponding to the values measured on the outside and the broken line corresponding to the values measured on the inside.
  • Curves 6 represent the external and internal values of the zinc coating in the manner already described after quenching 10 s after being removed from the bath.
  • Curves 7 show the conditions after a holding time of 75 s.
  • Curves 10 illustrate the values which were measured after quenching 10 s after removal, while curves 11 represent the values obtained after a holding time of 90 s.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)
EP80890108A 1979-09-26 1980-09-24 Procédé de zingage à chaud d'articles en fer ou en acier Expired EP0026757B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6306/79 1979-09-26
AT0630679A AT365243B (de) 1979-09-26 1979-09-26 Verfahren zum feuerverzinken von eisen- oder stahlgegenstaenden

Publications (2)

Publication Number Publication Date
EP0026757A1 true EP0026757A1 (fr) 1981-04-08
EP0026757B1 EP0026757B1 (fr) 1985-02-20

Family

ID=3584968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80890108A Expired EP0026757B1 (fr) 1979-09-26 1980-09-24 Procédé de zingage à chaud d'articles en fer ou en acier

Country Status (6)

Country Link
EP (1) EP0026757B1 (fr)
AT (1) AT365243B (fr)
CS (1) CS212726B2 (fr)
DD (1) DD153135A5 (fr)
DE (1) DE3070214D1 (fr)
HU (1) HU183217B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113255A2 (fr) * 1982-12-24 1984-07-11 Sumitomo Electric Industries Limited Fil d'acier galvanisé résistant à la chaleur
EP0819598A2 (fr) * 1996-07-16 1998-01-21 Sachsenring Automobiltechnik AG Joint à rotule et procédé pour son revêtement
US20130280548A1 (en) * 2009-01-21 2013-10-24 Toyomitsu Nakamura Bent metal member and a method for its manufacture

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646362C2 (de) 1996-11-09 2000-07-06 Thyssen Stahl Ag Verfahren zum Wärmebehandeln von ZnAl-schmelztauchbeschichtetem Feinblech
US6634252B2 (en) 2001-06-14 2003-10-21 Teleflex Incorporated Support for motion transmitting cable assembly
DE102007026061A1 (de) * 2007-06-01 2008-12-18 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verschleiß- und korrosionsbeständiges Bauteil und Verfahren zu seiner Herstellung
EP4116456A1 (fr) 2021-07-09 2023-01-11 Matro GmbH Procédé et installation de galvanisation de pièces en fer et en acier

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521004A1 (de) * 1966-02-11 1969-08-14 Siemens Ag Verfahren zur Herstellung von gegen Spannungskorrosion bestaendigen Metallteilen
DE2711041A1 (de) * 1976-03-16 1977-09-29 Arbed Verfahren zur herstellung von verzinkten blechen und vorrichtung zur durchfuehrung des verfahrens

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1521004A1 (de) * 1966-02-11 1969-08-14 Siemens Ag Verfahren zur Herstellung von gegen Spannungskorrosion bestaendigen Metallteilen
DE2711041A1 (de) * 1976-03-16 1977-09-29 Arbed Verfahren zur herstellung von verzinkten blechen und vorrichtung zur durchfuehrung des verfahrens

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0113255A2 (fr) * 1982-12-24 1984-07-11 Sumitomo Electric Industries Limited Fil d'acier galvanisé résistant à la chaleur
EP0113255A3 (en) * 1982-12-24 1985-04-24 Sumitomo Electric Industries Limited Heat-resistant galvanized iron alloy wire
EP0819598A2 (fr) * 1996-07-16 1998-01-21 Sachsenring Automobiltechnik AG Joint à rotule et procédé pour son revêtement
EP0819598A3 (fr) * 1996-07-16 1998-08-19 Sachsenring Automobiltechnik AG Joint à rotule et procédé pour son revêtement
US20130280548A1 (en) * 2009-01-21 2013-10-24 Toyomitsu Nakamura Bent metal member and a method for its manufacture

Also Published As

Publication number Publication date
ATA630679A (de) 1981-05-15
HU183217B (en) 1984-04-28
CS212726B2 (en) 1982-03-26
DD153135A5 (de) 1981-12-23
DE3070214D1 (en) 1985-03-28
EP0026757B1 (fr) 1985-02-20
AT365243B (de) 1981-12-28

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