EP1694880B1 - Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier - Google Patents

Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier Download PDF

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Publication number
EP1694880B1
EP1694880B1 EP04817552A EP04817552A EP1694880B1 EP 1694880 B1 EP1694880 B1 EP 1694880B1 EP 04817552 A EP04817552 A EP 04817552A EP 04817552 A EP04817552 A EP 04817552A EP 1694880 B1 EP1694880 B1 EP 1694880B1
Authority
EP
European Patent Office
Prior art keywords
flux
steel
zinc
zncl
articles
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.)
Not-in-force
Application number
EP04817552A
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German (de)
English (en)
Other versions
EP1694880A2 (fr
Inventor
Michael Gilles
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.)
UMICORE ZINC ALLOYS BELGIUM
Original Assignee
Umicore NV 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 Umicore NV SA filed Critical Umicore NV SA
Priority to EP04817552A priority Critical patent/EP1694880B1/fr
Publication of EP1694880A2 publication Critical patent/EP1694880A2/fr
Application granted granted Critical
Publication of EP1694880B1 publication Critical patent/EP1694880B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C23C2/30—Fluxes or coverings on molten baths

Definitions

  • the thermal stress problem is moreover exacerbated when galvanising with recently developed highly wetting alloys.
  • Such alloys typically containing tin or bismuth, have been introduced to avoid so-called "black spots", i.e. small areas on the steel surface that remain uncovered after the galvanising process.
  • black spots i.e. small areas on the steel surface that remain uncovered after the galvanising process.
  • These alloys are particularly useful, as they tend to stabilise the thickness of the galvanised layer for a wide range of steel types.
  • their good wetting capability increases the heat transfer, which leads to accelerated warm-up of articles being dipped and to increased thermal stress as a direct consequence.
  • the influence of flux and alloy on the thermal stress is evaluated by measuring the heating rate inside a fluxed steel article upon its immersion into a zinc alloy bath. To standardise this measurement, use is made of a probe consisting of a small hollow steel chamber with a wall thickness of 1.3 mm, equipped with a thermocouple brazed against the inner surface of a wall. Upon immersion in the molten alloy at a descent rate of 2.5 cm/s, the temperature rise is recorded and the rate of heating is calculated (°C/s). The descent rate is sufficiently high to ensure that it is nor a critical nor a limiting parameter. The highest rate of heating reached during the immersion phase is reported. It is assumed that this rate is closely related to the maximal thermal stress endured during dipping and to the ensuing damages.

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)

Claims (7)

  1. Flux à base d'eau pour galvanisation dans un bain d'immersion à chaud d'articles en acier, comprenant, au total, 200 à 600 g/l de ZnCl2 et NH4Cl, avec un rapport molaire de NH4Cl à ZnCl2 de 1,7 à à 3,3, caractérisé en ce que le flux comprend 8 à 80 g/l de AlCl3.
  2. Flux à base d'eau selon la revendication 1, caractérisé en ce que le flux comprend 10 à 50 g/l de AlCl3.
  3. Flux à base d'eau selon la revendication 1 ou 2, caractérisé en ce que le flux comprend 250 à 600 g/l du sel double ZnCl2.2NH4Cl.
  4. Flux à base d'eau selon l'une quelconque des revendications 1 à 3, caractérisé en ce que le flux comprend entre 200 à 500 g/l du sel triple ZnCl2.3NH4Cl.
  5. Flux à base d'eau selon l'une quelconque des revendications 1 à 4, caractérisé en ce que le flux comprend moins de 15 g/l de Fe, et de préférence moins de 10 g/l de Fe.
  6. Procédé de galvanisation par immersion à chaud d'un article en acier, comprenant les étapes de :
    - fluxage de l'article avec un flux selon l'une quelconque des revendications 1 à 5 ;
    - séchage de l'article ; et
    - immersion de l'article dans un bain fondu d'un alliage de zinc comprenant, en poids, 0,1 à moins de 5 % de l'un ou l'autre de Bi et Sn ou des deux.
  7. Procédé selon la revendication 6, caractérisé en ce que l'alliage de zinc comprend, en poids, 0,5 à 5 % de l'un ou l'autre de Sn et Bi ou des deux, 0 à la teneur à saturation de Pb, 0,025 à 0, 200 % de l'un au moins parmi V, Ni, Cr et Mn, 0 à 0,05 % de l'un au moins parmi Al, Ca et Mg, le reste étant du zinc et des impuretés inévitables.
EP04817552A 2003-12-09 2004-12-09 Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier Not-in-force EP1694880B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04817552A EP1694880B1 (fr) 2003-12-09 2004-12-09 Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP03078869 2003-12-09
US52994603P 2003-12-17 2003-12-17
PCT/EP2004/014154 WO2005056867A2 (fr) 2003-12-09 2004-12-09 Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier
EP04817552A EP1694880B1 (fr) 2003-12-09 2004-12-09 Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier

Publications (2)

Publication Number Publication Date
EP1694880A2 EP1694880A2 (fr) 2006-08-30
EP1694880B1 true EP1694880B1 (fr) 2007-06-13

Family

ID=34924029

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04817552A Not-in-force EP1694880B1 (fr) 2003-12-09 2004-12-09 Flux limitant le transfert de chaleur et son utilisation dans la galvanisation de l'acier

Country Status (3)

Country Link
EP (1) EP1694880B1 (fr)
AT (1) ATE364732T1 (fr)
WO (1) WO2005056867A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108884545A (zh) * 2016-03-21 2018-11-23 方丹控股有限公司 热浸镀锌系统和热浸镀锌方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2894255B1 (fr) * 2005-12-01 2008-04-04 Electro Rech Sarl Bain de galvanisation a chaud de pieces en une nuance d'acier quelconque
DE102016111725A1 (de) 2016-06-13 2017-12-14 Fontaine Holdings Nv Verfahren und Flussmittel für die Feuerverzinkung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2245226A (en) * 1940-01-23 1941-06-10 Robert F Renkin Method of coating metal
GB830258A (en) * 1956-01-10 1960-03-16 Crittall Mfg Co Ltd Galvanizing process
BE795632A (fr) * 1972-02-23 1973-08-20 Basf Ag Fondant pour galvanisation a chaud
US3943270A (en) * 1973-03-01 1976-03-09 Foseco International Limited Aqueous flux for hot dip galvanising process
DE2417791C2 (de) * 1974-04-11 1976-04-01 Basf Ag, 6700 Ludwigshafen Flußmittel für die Feuerverzinkung -Verzinnung und -verbleiuhg
JPS6199664A (ja) * 1984-10-19 1986-05-17 Kobe Steel Ltd 溶融亜鉛−アルミニウム合金めつき法
LU86339A1 (fr) * 1986-03-04 1987-11-11 Foridienne Chimie N V Compositions de flux sans fluorures pour la galvanisation a chaud dans des bains de zinc aluminies
SI1003921T1 (en) * 1997-05-23 2003-02-28 N.V. Umicore S.A. Alloy and process for galvanizing steel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108884545A (zh) * 2016-03-21 2018-11-23 方丹控股有限公司 热浸镀锌系统和热浸镀锌方法
CN108884545B (zh) * 2016-03-21 2020-09-18 方丹控股有限公司 热浸镀锌系统和热浸镀锌方法

Also Published As

Publication number Publication date
EP1694880A2 (fr) 2006-08-30
ATE364732T1 (de) 2007-07-15
WO2005056867A3 (fr) 2005-11-24
WO2005056867A2 (fr) 2005-06-23

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