EP1518004A1 - Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud - Google Patents

Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud

Info

Publication number
EP1518004A1
EP1518004A1 EP03714895A EP03714895A EP1518004A1 EP 1518004 A1 EP1518004 A1 EP 1518004A1 EP 03714895 A EP03714895 A EP 03714895A EP 03714895 A EP03714895 A EP 03714895A EP 1518004 A1 EP1518004 A1 EP 1518004A1
Authority
EP
European Patent Office
Prior art keywords
gas
nitrogen
zinc
argon
hot dip
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
EP03714895A
Other languages
German (de)
English (en)
Other versions
EP1518004B1 (fr
Inventor
Walter Trakowski
Rolf Brisberger
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.)
SMS Siemag AG
Original Assignee
SMS Demag 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
Priority claimed from DE10233343A external-priority patent/DE10233343A1/de
Application filed by SMS Demag AG filed Critical SMS Demag AG
Priority to SI200331126T priority Critical patent/SI1518004T1/sl
Publication of EP1518004A1 publication Critical patent/EP1518004A1/fr
Application granted granted Critical
Publication of EP1518004B1 publication Critical patent/EP1518004B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • C23C2/003—Apparatus
    • C23C2/0034—Details related to elements immersed in bath
    • C23C2/00342—Moving elements, e.g. pumps or mixers
    • C23C2/00344—Means for moving substrates, e.g. immersed rollers or immersed bearings
    • 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
    • C23C2/003—Apparatus
    • C23C2/0038—Apparatus characterised by the pre-treatment chambers located immediately upstream of the bath or occurring locally before the dipping process
    • C23C2/004—Snouts
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas

Definitions

  • the invention relates to a method for suppressing zinc evaporation during hot dip coating of a steel strip with zinc or zinc alloys.
  • the effect of sublimation of the coating metal occurs with continuous hot-dip coating and especially hot-dip galvanizing of metal strips. This is particularly critical since sublimation also takes place in the furnace area of the upstream strip annealing and surface activation. A hydrogen / nitrogen atmosphere is usually present in this unit. The sublimate pushes back against the belt run and is deposited in colder places in the oven. This effect is promoted by the presence of hydrogen. This effect is known and leads to surface defects on the metal strip to be coated with increasing sublimation.
  • Document DE 44 00 886 C2 describes a method for suppressing zinc evaporation during hot dip coating of a steel strip with zinc or zinc alloys, the steel strip being formed in a feed area under a protective gas atmosphere from a mixture of an inert gas with hydrogen and / or carbon monoxide as reducing gases and additionally Carbon dioxide located.
  • the protective gas atmosphere should contain up to 20 volume percent hydrogen and up to 10 volume percent carbon monoxide, or 0.05 to 8 volume percent Co 2 should be added to the protective gas atmosphere.
  • Document EP 0 172 681 B1 describes a process for suppressing the development of zinc vapors in a continuous process for hot-dip coating an iron-based metal strip with zinc or zinc alloys, in which the strip is enclosed in an inlet area.
  • Water vapor is introduced into this inlet area to maintain an atmosphere that oxidizes the zinc vapors but does not oxidize the iron strip and that contains at least 264 ppm water vapor and at least 1 volume percent hydrogen.
  • the atmosphere within the inlet area should preferably contain 1 to 8 volume percent hydrogen and 300-4500 volume ppm water vapor, the adjustment being carried out with an inert gas, for example nitrogen.
  • the invention is based on the knowledge that the turbulence of the gas above the surface of the metal bath and its thermal conductivity are included in the amount of sublimation formation. It is therefore important to find a gas that collects above the metal bath and thus prevents turbulence and has poor conductivity.
  • the present invention has set itself the task of suppressing the formation of sublimate and of ensuring that the coating is flawless, regardless of the amount of gas which avoids sublimate.
  • a gas or a gas mixture as separation gas be located above the metal bath, which has poor thermal conductivity and includes the property of turbulence of the gas or gas mixture over the surface of the metal bath reduce or prevent.
  • gases such as carbon dioxide and water vapor (moisture)
  • a noble gas for example argon
  • the advantage of argon is that it has both a high density (low turbulence) and a poorer thermal conductivity than the otherwise used nitrogen.
  • an inert gas it does not have an oxidizing effect.
  • the following gases are also conceivable as separation gases: butane, krypton, propane, sulfur dioxide, hydrogen sulfide, xenon and other gases such as acetylene, arsine, boron trichloride, boron trifluoride, butene, dichlorosilane, disilane, ethylene oxide, tetrafluoromethane, monochlorodifluoromethane, trifluoromethane, trifluoromethane, trifluoromethane , Tetrafluoroethylene, isobutane, nitrogen dioxide, nitrogen trifluoride, nitrogen oxide, phoshpin, propylene, silane, silicon tetrafluoride, silicon tetrachloride, sulfur hexafluoride, sulfur tetrafluoride, tungsten hexafluoride. Any composition of the aforementioned gases to a gas mixture with or without argon can also be used as the separation gas as soon as this gas mixture meets the conditions of
  • the invention is shown schematically in FIG. 1. It can be seen from the drawing that one of the gases mentioned above, for example argon, is used in such a way that, during normal operation, no large amounts of gas are required to be injected into the furnace trunk 1.
  • the furnace trunk 1 through which the metal strip 3 to be coated is guided, dips obliquely into the metal bath 2 in the container 6.
  • the metal strip 3 dips into the metal bath or coating bath 2, is deflected by the deflection roller 7 and emerges from the metal bath at 8.
  • Scraper nozzles 9 are arranged above the exit point.
  • a separating gas layer above the metal bath for example argon 4 as a separating gas between the surface of the metal bath 2 and the gas mixture 5 usually used, consisting of nitrogen and hydrogen.
  • argon 4 as a separating gas between the surface of the metal bath 2 and the gas mixture 5 usually used, consisting of nitrogen and hydrogen.

Landscapes

  • 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)
  • Materials For Medical Uses (AREA)
  • Detergent Compositions (AREA)

Abstract

L'invention concerne un procédé permettant d'empêcher une évaporation du zinc lors du revêtement d'une bande d'acier par immersion à chaud dans un bain de zinc ou d'alliages de zinc. Ce procédé consiste à maintenir au-dessus du bain de métal fondu une couche de gaz de séparation, contenant par exemple un des gaz suivants : argon, butane, krypton, propane, dioxyde de soufre, acide sulfhydrique, xénon, acétylène, arsine, trichlorure de bore, trifluorure de bore, butène, dichlorosilane, disilane, oxyde d'éthylène, tétrafluorométhane, monochlorodifluorométhane, trifluorométhane, hexafluoroéthane, tétrafluoroéthène, isobutane, dioxyde d'azote, trifluorure d'azote, oxyde d'azote, phosphine, propylène, silane, tétrafluorure de silicium, tétrachlorure de silicium, hexafluorure de soufre, tétrafluorure de soufre ou hexafluorure de tungstène, ou n'importe quelle combinaison de ces gaz formant un mélange de gaz, avec ou sans argon. Ces gaz possèdent une mauvaise conductivité et permettent d'empêcher des turbulences gazeuses.
EP03714895A 2002-06-28 2003-03-28 Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud Expired - Lifetime EP1518004B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200331126T SI1518004T1 (sl) 2002-06-28 2003-03-28 Uporaba locevalnega plina pri kontinuiranem oplemenitenju kovin z vrocim omakanjem

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE10229203 2002-06-28
DE10229203 2002-06-28
DE10233343 2002-07-23
DE10233343A DE10233343A1 (de) 2002-06-28 2002-07-23 Trenngaseinsatz bei der kontinuierlichen Schmelztauchveredelung
PCT/EP2003/003219 WO2004003250A1 (fr) 2002-06-28 2003-03-28 Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud

Publications (2)

Publication Number Publication Date
EP1518004A1 true EP1518004A1 (fr) 2005-03-30
EP1518004B1 EP1518004B1 (fr) 2007-12-26

Family

ID=30001492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03714895A Expired - Lifetime EP1518004B1 (fr) 2002-06-28 2003-03-28 Utilisation de gaz de separation lors de la finition en continue de metaux par immersion a chaud

Country Status (13)

Country Link
US (1) US20050233088A1 (fr)
EP (1) EP1518004B1 (fr)
JP (1) JP2005539136A (fr)
CN (1) CN100422378C (fr)
AT (1) ATE382104T1 (fr)
AU (1) AU2003219109B2 (fr)
BR (1) BR0311470A (fr)
DE (1) DE50308889D1 (fr)
ES (1) ES2297143T3 (fr)
MX (1) MXPA04012328A (fr)
PL (1) PL206283B1 (fr)
RU (1) RU2319786C2 (fr)
WO (1) WO2004003250A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013101131A1 (de) * 2013-02-05 2014-08-07 Thyssenkrupp Steel Europe Ag Vorrichtung zum Schmelztauchbeschichten von Metallband
US9956576B2 (en) * 2014-04-22 2018-05-01 Metokote Corporation Zinc rich coating process
CN110639233B (zh) * 2019-08-20 2021-12-07 中船重工（邯郸）派瑞特种气体有限公司 一种去除三氟化氮中二氟二氮、四氟二氮的方法

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE617024C (de) * 1929-06-12 1935-08-10 Karl Daeves Dr Ing Verfahren zur Verhinderung der Bildung weissen Rostes bei verzinkten Waren
AU421751B2 (en) * 1968-03-08 1972-02-25 Australian Wire Industries Pty, Ltd Improved method of and apparatus for wiping galvanised wire or strip
NZ188953A (en) * 1977-12-15 1982-12-21 Australian Wire Ind Pty Coating control of wire emerging from metal bath
GB2050432B (en) * 1979-05-09 1983-12-21 Boc Ltd Use of liquefied gas in hot dip metal coating
US4339480A (en) * 1980-04-11 1982-07-13 Bethlehem Steel Corporation Gas wiping apparatus and method of using
US4557953A (en) * 1984-07-30 1985-12-10 Armco Inc. Process for controlling snout zinc vapor in a hot dip zinc based coating on a ferrous base metal strip
DE3631893A1 (de) * 1986-09-19 1988-03-31 Paul Fontaine Verfahren und vorrichtung zum abstreifen von mit schmelzfluessigem material beschichtetem blech
CN1054622A (zh) * 1991-04-24 1991-09-18 文联煜 氮基保护气氛制气剂
JPH07180014A (ja) * 1993-12-22 1995-07-18 Nippon Steel Corp 溶融金属めっきのスナウト内浴面からのＺｎ蒸発抑制方法
JPH11279730A (ja) * 1998-03-27 1999-10-12 Nisshin Steel Co Ltd Ｚｎの酸化を抑制した溶融めっき方法
FR2782326B1 (fr) * 1998-08-13 2000-09-15 Air Liquide Procede de galvanisation d'une bande metallique
US7129311B2 (en) * 2002-09-18 2006-10-31 Arch Specialty Chemicals, Inc. Additives to prevent degradation of alkyl-hydrogen siloxanes
JP4243209B2 (ja) * 2003-03-28 2009-03-25 富士フイルム株式会社 絶縁膜形成材料及びそれを用いた絶縁膜

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004003250A1 *

Also Published As

Publication number Publication date
ATE382104T1 (de) 2008-01-15
US20050233088A1 (en) 2005-10-20
AU2003219109B2 (en) 2009-01-22
CN1665954A (zh) 2005-09-07
RU2319786C2 (ru) 2008-03-20
DE50308889D1 (de) 2008-02-07
EP1518004B1 (fr) 2007-12-26
MXPA04012328A (es) 2005-04-08
RU2005102086A (ru) 2005-07-20
PL206283B1 (pl) 2010-07-30
AU2003219109A1 (en) 2004-01-19
ES2297143T3 (es) 2008-05-01
BR0311470A (pt) 2005-03-15
JP2005539136A (ja) 2005-12-22
PL372068A1 (en) 2005-07-11
CN100422378C (zh) 2008-10-01
WO2004003250A1 (fr) 2004-01-08

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