EP0026757B1 - 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
EP0026757B1
EP0026757B1 EP80890108A EP80890108A EP0026757B1 EP 0026757 B1 EP0026757 B1 EP 0026757B1 EP 80890108 A EP80890108 A EP 80890108A EP 80890108 A EP80890108 A EP 80890108A EP 0026757 B1 EP0026757 B1 EP 0026757B1
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EP
European Patent Office
Prior art keywords
zinc
bath
tubes
kept
galvanized
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.)
Expired
Application number
EP80890108A
Other languages
German (de)
English (en)
Other versions
EP0026757A1 (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
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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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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
    • C23C2/26—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 pipes in automatic galvanizing plants, in which the pipes to be galvanized are immersed in a zinc bath after degreasing, pickling, rinsing, application of fluxing agents and optionally drying and after removal from the zinc bath blown off and quenched.
  • the required zinc coating in qlm 2 is prescribed especially for use in drinking water pipes.
  • the zinc coating also includes all iron-zinc alloys that occur due to diffusion processes.
  • 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 at least 450 to 465 ° C., and in the case of steel tubes 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.
  • a time of about 10 s is required before immersion 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 specific 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 consists in that the pipes to be galvanized are immersed in the zinc bath until a quantity of zinc / m 2 is absorbed, which corresponds to a weight per unit area of the zinc coating / m 2 after blowing off with air and / or water vapor, which is less than the desired weight per unit area of the zinc coating / M 2 and at most 95% of the desired weight per unit area of the zinc coating / M 2 corresponds to the fact that the galvanized pipes after they have been removed from the zinc bath at temperatures of over 250 ° C.
  • the immersion time in the zinc bath is chosen so that after blowing off a zinc amount / 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 and at most 95% of the desired weight per unit area of the zinc coating / m 2 corresponds, it is achieved that less zinc is applied from the bath.
  • the dipping time is thus shortened compared to the known methods, and strong blowing off 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 objects are preferably immersed in the zinc bath until a quantity of zinc / m 2 is absorbed which, after being blown off with air and / or water vapor, is about 85% of the desired Basis weight of the zinc coating / m z corresponds. In this way, savings of up to 15% in zinc are readily possible, although this consideration does not take into account that the lower contamination of the zinc bath by iron also results in a significant improvement in economy.
  • 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 objects 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, for at least 75% of the layer thickness of the zinc coating.
  • the formation of the iron-zinc alloy layer can preferably extend over at least 80%, in particular 90%, of the layer thickness of the zinc coating, the upper limit being given only by the fact that an outermost layer of the zinc coating, preferably with a layer thickness of at most 5% of the
  • the total thickness of the zinc coating, which is to be formed from pure zinc, is to 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 water vapor atmosphere. It has proven to be particularly advantageous if the holding time at temperatures above 250 ° C. after the objects have been removed from the zinc bath is longer than 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 significantly lower temperatures enter the zinc bath than after. a drying oven would be the case. Since diffusion processes only start at 250 ° C, the time until which diffusion processes in the zinc bath cannot yet take place is extended in this way. 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 an addition of aluminum largely suppresses the diffusion processes and thus the formation of alloys 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.
  • the invention is further illustrated by the diagrams shown in the figures of the drawing explained in more detail, in which, in addition to the zinc coating determined, the distribution of the zinc coatings over the length of the tube can also be seen at different holding times at temperatures above 250 ° C.
  • the zinc coating in g / m 2 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.
  • a stripping pressure of 1.2 bar and a blow-out pressure of 5 bar were observed with a blow-out time of 0.8 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.

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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)
  • Physics & Mathematics (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Thermal Sciences (AREA)
  • Coating With Molten Metal (AREA)

Claims (12)

1. Procédé de galvanisation à chaud de tuyaux de fer ou d'acier dans des installations de galvanisation automatiques, dans lequel les tuyaux à galvaniser, après dégraissage, décapage, rinçage, application de fondants et le cas échéant séchage, sont plongés dans un bain de zinc et, après leur retrait du bain de zinc, sont soufflés et trempés, caractérisé en ce que les tuyaux à galvaniser sont plongés dans le bain de zinc jusqu'à la fixation d'une quantité de zinc/m2 qui, après le soufflage avec de l'air et/ou de la vapeur d'eau, correspond à une masse surfacique du dépôt de zinc/m2 qui est plus faible que la masse surfacique du dépôt de zinc/m2 souhaitée et correspond au plus à 95 % de la masse surfacique du dépôt de zinc/m2 souhaitée, en ce que les tuyaux galvanisés, après leur retrait du bain de zinc, sont maintenus à des températures de plus de 250 °C jusqu'à l'accroissement du dépôt de zinc à la masse surfacique/m2 souhaitée, une couche intermétallique d'alliage zinc-fer étant obtenue dans un domaine partiel d'au moins 60 % de l'épaisseur de couche du dépôt de zinc par diffusion de fer dans le zinc et une couche la plus externe du dépôt de zinc en zinc pur étant formée et en ce que les tuyaux galvanisés sont ensuite trempés d'une manière connue en soi.
2. Procédé suivant la revendication 1, caractérisé en ce que les tuyaux sont plongés dans le bain de zinc jusqu'à la fixation d'une quantité de zinc/m2 qui correspond, après soufflage à l'air et/ou à la vapeur d'eau, à environ 85 % de la masse surfacique du dépôt de zinc/m2 souhaité.
3. Procédé suivant les revendications 1 ou 2, caractérisé en ce que les tuyaux galvanisés sont maintenus après leur retrait jusqu'à un accroissement du dépôt de zinc/m2 d'au moins 10 %, de préférence d'au moins 15 %, à des températures de plus de 250 °C.
4. Procédé suivant les revendications 1, 2 ou 3, caractérisé en ce que les tuyaux galvanisés, après leur retrait du bain de zinc sont maintenus jusqu'à la formation d'une couche d'alliage intermétallique zinc-fer supérieure à au moins 75 % de l'épaisseur de couche du dépôt de zinc à des températures de plus de 250 °C.
5. Procédé suivant l'une des revendications 1 à 4, caractérisé en ce que le temps de maintien à une température de plus de 250 °C après le retrait des tuyaux du bain de zinc est choisi pour l'obtention d'une épaisseur de couche de l'alliage intermétallique d'au moins 80 %, de préférence d'au moins 90 % de l'épaisseur de couche du dépôt de zinc.
6. Procédé suivant l'une des revendications 1 à 5, caractérisé en ce que la durée maxima du temps de maintien des tuyaux après leur retrait du bain de zinc à une température de plus de 250 °C est fixée de telle sorte que la couche la plus externe, en zinc pur, est formée avec une épaisseur de couche de 5 % au maximum de l'épaisseur totale du dépôt de zinc.
7. Procédé suivant l'une des revendications 1 à 6, caractérisé en ce que les tuyaux, après leur retrait du bain de zinc, sont maintenus entre 10 et 120 s, de préférence au moins 20 s, en particulier 60 à 90 s, à des températures de plus de 250 °C, de préférence au-dessus de 300 °C.
8. Procédé suivant l'une des revendications 1 à 7, caractérisé en ce que les tuyaux sont plongés 20 à 180 s, de préférence 20 à 120 s, dans le bain de zinc, puis sont maintenus en dehors du bain de zinc jusqu'à la trempe 20 à 120 s à des températures au-dessus de 250 °C.
9. Procédé suivant l'une des revendications 1 à 8, caractérisé en ce que les tuyaux sont maintenus pendant le temps du maintien dans l'air au repos ou dans une atmosphère de vapeur d'eau.
10. Procédé suivant l'une des revendications 1 à 9, caractérisé en ce que le temps de maintien à des températures au-dessus de 250 °C après le retrait des tuyaux du bain de zinc est plus long que le temps d'immersion des objets dans le bain de zinc.
11. Procédé suivant l'une des revendications 1 à 10, caractérisé en ce que le procédé est effectué sous forme de galvanisation humide.
12. Procédé suivant l'une des revendications 1 à 11, caractérisé en ce qu'on utilise un bain de zinc avec une addition d'aluminium de 0,08 à 0,5, de préférence 0,2 % en poids.
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 EP0026757A1 (fr) 1981-04-08
EP0026757B1 true EP0026757B1 (fr) 1985-02-20

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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
DE19646362A1 (de) * 1996-11-09 1998-05-14 Thyssen Stahl Ag Verfahren zum Wärmebehandeln von ZnAl-schmelztauchbeschichtetem Feinblech
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

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0679449B2 (ja) * 1982-12-24 1994-10-05 住友電気工業株式会社 耐熱亜鉛被覆ａｃｓｒ用鉄合金線
DE19628544C1 (de) * 1996-07-16 1998-02-26 Sachsenring Automobiltechnik Kugelgelenk und Verfahren zum Beschichten desselben
US6634252B2 (en) 2001-06-14 2003-10-21 Teleflex Incorporated Support for motion transmitting cable assembly
AU2010207269B2 (en) * 2009-01-21 2013-08-29 Nippon Steel Corporation Bent metal member and a method for its manufacture

Family Cites Families (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
LU74569A1 (fr) * 1976-03-16 1977-09-27

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
"Chem. Technologie", v. K. Winneck und L. Küchler, 1973, S. 641 *
"Hütte, Taschenbuch für Eisenhüttenleute", 1961, S. 1156 *
"Lueger Lexikon der Technik", 1968, Bd. 9, S. 70/71 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19646362A1 (de) * 1996-11-09 1998-05-14 Thyssen Stahl Ag Verfahren zum Wärmebehandeln von ZnAl-schmelztauchbeschichtetem Feinblech
DE19646362C2 (de) * 1996-11-09 2000-07-06 Thyssen Stahl Ag Verfahren zum Wärmebehandeln von ZnAl-schmelztauchbeschichtetem Feinblech
US6231695B1 (en) 1996-11-09 2001-05-15 Thyssen Stahl Ag Method of heat-treating a thin sheet coated with ZnAL by hot dip galvanization
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

Also Published As

Publication number Publication date
AT365243B (de) 1981-12-28
DD153135A5 (de) 1981-12-23
CS212726B2 (en) 1982-03-26
HU183217B (en) 1984-04-28
ATA630679A (de) 1981-05-15
DE3070214D1 (en) 1985-03-28
EP0026757A1 (fr) 1981-04-08

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