EP0026757B1 - Verfahren zum Feuerverzinken von Eisen- oder Stahlgegenständen - Google Patents

Verfahren zum Feuerverzinken von Eisen- oder Stahlgegenständen Download PDF

Info

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
Authority
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)
French (fr)
Other versions
EP0026757A1 (de
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/de
Application granted granted Critical
Publication of EP0026757B1 publication Critical patent/EP0026757B1/de
Expired legal-status Critical Current

Links

Images

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.

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 Verfahren zum Feuerverzinken von Eisen- oder Stahlgegenständen Expired EP0026757B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

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

Family

ID=3584968

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80890108A Expired EP0026757B1 (de) 1979-09-26 1980-09-24 Verfahren zum Feuerverzinken von Eisen- oder Stahlgegenständen

Country Status (6)

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

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 (de) 2021-07-09 2023-01-11 Matro GmbH Verfahren und anlage zum verzinken von eisen- und stahlwerkstücken

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
KR20110103469A (ko) * 2009-01-21 2011-09-20 수미도모 메탈 인더스트리즈, 리미티드 굽힘 가공 금속재 및 그 제조 방법

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 (cs) * 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 (de) 2021-07-09 2023-01-11 Matro GmbH Verfahren und anlage zum verzinken von eisen- und stahlwerkstücken

Also Published As

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

Similar Documents

Publication Publication Date Title
DE102004059566B3 (de) Verfahren zum Schmelztauchbeschichten eines Bandes aus höherfestem Stahl
WO2009047183A1 (de) Verfahren zum herstellen eines stahlbauteils durch warmformen und durch warmformen hergestelltes stahlbauteil
DE2743655B2 (de) Legierung zum Tauchgalvanisieren von Stühlen und Anwendung derselben
DE2510328C2 (de) Verfahren zur Verbesserung der Korrosions-Widerstandsfähigkeit von Formkörpern aus Stahl oder Eisen
DE102008005605A1 (de) Verfahren zum Beschichten eines 6 - 30 Gew. % Mn enthaltenden warm- oder kaltgewalzten Stahlflachprodukts mit einer metallischen Schutzschicht
EP2010690A1 (de) Verfahren zum schmelztauchbeschichten eines stahlflachproduktes aus höherfestem stahl
EP3749793B1 (de) Verfahren zur herstellung eines stahlbandes mit verbesserter haftung metallischer schmelztauchüberzüge
DE3444540A1 (de) Feuerverzinkte staehle und verfahren zu deren herstellung
DE3242625C2 (de) Verfahren zur Herstellung von feuerverzinkten Stahlblechen und Feuerverzinkungsschmelze
DE2754801A1 (de) Verfahren und vorrichtung zur erzeugung eines - insbesondere blattartigen - materials aus nicht oxydierbarem stahl
WO2006045570A1 (de) Verfahren zum herstellen eines korrosionsgeschützten stahlblechs
DE68912019T2 (de) Methode zur Herstellung eines geglühten Stahlbands.
DE69201689T2 (de) Verfahren zur Heisstauch-Beschichtung von Chrom enthaltendem Strahl.
EP0026757B1 (de) Verfahren zum Feuerverzinken von Eisen- oder Stahlgegenständen
DE69404933T2 (de) Mit Eisenzink-Aluminium-Legierung beschichteter Stahldraht und Verfahren zur Herstellung
DE69701070T2 (de) Feuerverzinktes Stahlblech und Herstellungsverfahren dafür
DE69300964T2 (de) Feuerverzinkte Stahlgegenstände und Verfahren zur Herstellung.
DE2258589A1 (de) Verfahren zum aufbringen von schutzueberzuegen auf stahlblech oder -band durch tauchen
DE69501386T2 (de) Verfahren zur Heisstauch-Beschichtung ohne Legieren einer Stahlplatte mit einem geringen Gehalt an Zwischengitteratomen
DE2941850C2 (de) Kontinuierliches Verfahren zur Überalterung von heißtauchüberzogenem Stahlblech oder -band
EP1252354B1 (de) Verfahren zum herstellen eines mit einer zinkbeschichtung versehenen stahlbandes
DE1521317A1 (de) Schutzueberzug
DE19646362C2 (de) Verfahren zum Wärmebehandeln von ZnAl-schmelztauchbeschichtetem Feinblech
DE69500797T2 (de) Verfahren zur Feuertauchbad-Aluminium eines Stahlbandes, enthaltend mindestens 0,1% Mangan, insbesondere rostfreies und/oder legiertes Stahl
DE69304028T2 (de) Silizidschicht beständig gegen geschmolzene Metalle

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LU NL

17P Request for examination filed

Effective date: 19810408

ITF It: translation for a ep patent filed
GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): BE CH DE FR GB IT LI LU NL

REF Corresponds to:

Ref document number: 3070214

Country of ref document: DE

Date of ref document: 19850328

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19850930

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19860930

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LI

Effective date: 19870930

Ref country code: CH

Effective date: 19870930

Ref country code: BE

Effective date: 19870930

BERE Be: lapsed

Owner name: VOEST-ALPINE A.G.

Effective date: 19870930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19880401

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19880531

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19880601

GBPC Gb: european patent ceased through non-payment of renewal fee
REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19881118