EP1793009A1 - Feuerverzinkungsbad für Stahlteile - Google Patents

Feuerverzinkungsbad für Stahlteile Download PDF

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Publication number
EP1793009A1
EP1793009A1 EP06301135A EP06301135A EP1793009A1 EP 1793009 A1 EP1793009 A1 EP 1793009A1 EP 06301135 A EP06301135 A EP 06301135A EP 06301135 A EP06301135 A EP 06301135A EP 1793009 A1 EP1793009 A1 EP 1793009A1
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EP
European Patent Office
Prior art keywords
weight
hot
steel
galvanizing
galvanizing 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
EP06301135A
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English (en)
French (fr)
Other versions
EP1793009B1 (de
Inventor
Thierry Schmitz
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.)
GROUPE ELECTROPOLI
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GROUPE ELECTROPOLI
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Publication date
Application filed by GROUPE ELECTROPOLI filed Critical GROUPE ELECTROPOLI
Priority to PL06301135T priority Critical patent/PL1793009T3/pl
Publication of EP1793009A1 publication Critical patent/EP1793009A1/de
Application granted granted Critical
Publication of EP1793009B1 publication Critical patent/EP1793009B1/de
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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

Definitions

  • the present invention relates to a hot-dip galvanizing bath of parts in any grade of steel that may or may not contain silicon and / or phosphorus.
  • Galvanizing particularly hot dip galvanizing which consists of covering the parts to be protected with a zinc-based layer is one of the most commonly used methods for obtaining such protection.
  • the parts to be treated are immersed in a bath of zinc or a molten zinc alloy at a temperature of the order of 400 to 500 ° C.
  • This pretreatment conventionally consists of successive stages of degreasing, generally carried out in an alkaline medium, acid pickling combined with an etching inhibitor, and fluxing in a pretreatment bath containing, as a rule, zinc chloride and sodium chloride. ammonium.
  • the parts to be treated are generally rinsed with water.
  • the galvanizing coatings must have a uniform non-marbled and glossy appearance, good adhesion to steel and furthermore a homogeneous thickness generally of the order of 10 to 70 microns.
  • the conventional hot dip galvanizing operation results in obtaining coatings having a greyish appearance unsatisfactory from the point of view of aesthetics, abnormally high thickness, which can go up to 400 or even 500 ⁇ m and furthermore not very adherent and not very resistant to shocks (risk of flaking under occasional shocks).
  • the Sandelin curve is characterized by a thick peak known as the "Sandelin peak" whose presence proves that the growth of the galvanizing layer is very fast approaching an equivalent Si content equal to 0.1%.
  • the conventional hot-dip galvanizing baths make it possible to obtain satisfactory results for so-called "hypo-Sandelin” steel grades with a low silicon or equivalent silicon content (equivalent Si ⁇ 0.01%) but not for grades of steel having a higher equivalent Si content.
  • HLE high-strength
  • THLE very high-limit steels
  • the object of the invention is to propose a hot-dip galvanizing bath of steel parts having a particular composition making it possible to achieve this goal.
  • Such a hot-dip galvanizing bath is suitable for the treatment of parts in any grade of steel having undergone pretreatment prior to degreasing, acid pickling and fluxing.
  • It is characterized in that it contains zinc as well as 0.1 to 1.5% by weight of bismuth and 0.1 to 1.5% by weight of tin.
  • the galvanizing bath also contains at least one metal selected from the group consisting of vanadium, manganese and aluminum.
  • This bath may in particular contain 0.04 to 0.15% by weight of vanadium and / or 0.10 to 0.30% by weight of manganese and / or at least 0.002% by weight of aluminum.
  • the complement to 100% by weight is constituted, besides by bismuth and tin by zinc of commercial purity (quality Z1 or Z2 having a minimum zinc content of 99.995% or 99.95% respectively) .
  • Such a bath makes it possible in parallel to satisfactorily treat steels containing only a low silicon content. and / or in phosphorus and also obtain, on such steels deposits of aesthetic appearance, thickness and adhesion able to meet the requirements.
  • the hot-dip galvanizing bath contains between 0.06 and 0.12% by weight of vanadium.
  • the hot-dip galvanizing bath contains between 0.15 and 0.25% by weight of manganese.
  • the hot-dip galvanizing bath contains between 0.0040 and 0.020% by weight of aluminum.
  • the hot dip galvanizing bath according to the invention may advantageously contain in proportions by weight between 0.5 and 1.5% of bismuth, between 0.5 and 1.5% of tin, between 0.06 and 0.12 % vanadium, between 0.15 and 0.25% manganese and between 0.004 and 0.20% aluminum.
  • the KITAGAWA diagram shows, for a given steel, the variations in the maximum stress at break after a cyclic loading of one million cycles, depending on the thickness of a conventional galvanizing coating.
  • the maximum tensile strength of the steel was 350 MPa in the raw state, and remained essentially constant for galvanizing coatings with a thickness of less than about 80 ⁇ m before decreasing significantly.
  • the maximum permissible thickness of the galvanizing coating was about 80 ⁇ m.
  • the percentage of the fatigue strength loss between the raw and the coated samples was then calculated and defined according to the KITAGAWA diagram the maximum thickness of the galvanizing coating to not affect the fatigue strength.
  • compositions of these steels are specified in Table 3 below.
  • the hot-dip galvanizing deposits thus obtained were then analyzed and in particular their average thicknesses and their weights calculated.

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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)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)
EP06301135A 2005-12-01 2006-11-09 Feuerverzinkungsbad für Stahlteile Not-in-force EP1793009B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL06301135T PL1793009T3 (pl) 2005-12-01 2006-11-09 Kąpiel do galwanizowania ogniowego przedmiotów ze stali dowolnego gatunku

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0553674A FR2894255B1 (fr) 2005-12-01 2005-12-01 Bain de galvanisation a chaud de pieces en une nuance d'acier quelconque

Publications (2)

Publication Number Publication Date
EP1793009A1 true EP1793009A1 (de) 2007-06-06
EP1793009B1 EP1793009B1 (de) 2008-02-20

Family

ID=36790878

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06301135A Not-in-force EP1793009B1 (de) 2005-12-01 2006-11-09 Feuerverzinkungsbad für Stahlteile

Country Status (8)

Country Link
US (1) US20070128067A1 (de)
EP (1) EP1793009B1 (de)
AT (1) ATE386828T1 (de)
CA (1) CA2565931C (de)
DE (1) DE602006000560T2 (de)
ES (1) ES2302313T3 (de)
FR (1) FR2894255B1 (de)
PL (1) PL1793009T3 (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053109A1 (en) * 1997-05-23 1998-11-26 N.V. Union Miniere S.A. Alloy and process for galvanizing steel
WO1998055664A1 (en) * 1997-06-06 1998-12-10 Cominco Ltd. Galvanizing of reactive steels
WO2002033140A2 (en) * 2000-10-16 2002-04-25 Teck Cominco Metals Ltd. Process and alloy for decorative galvanizing of steel
WO2005056867A2 (en) * 2003-12-09 2005-06-23 Umicore Heat transfer limiting flux and its use in galvanising steel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998053109A1 (en) * 1997-05-23 1998-11-26 N.V. Union Miniere S.A. Alloy and process for galvanizing steel
WO1998055664A1 (en) * 1997-06-06 1998-12-10 Cominco Ltd. Galvanizing of reactive steels
WO2002033140A2 (en) * 2000-10-16 2002-04-25 Teck Cominco Metals Ltd. Process and alloy for decorative galvanizing of steel
WO2005056867A2 (en) * 2003-12-09 2005-06-23 Umicore Heat transfer limiting flux and its use in galvanising steel

Also Published As

Publication number Publication date
DE602006000560T2 (de) 2009-03-19
EP1793009B1 (de) 2008-02-20
CA2565931A1 (fr) 2007-06-01
PL1793009T3 (pl) 2008-07-31
DE602006000560D1 (de) 2008-04-03
CA2565931C (fr) 2009-10-13
US20070128067A1 (en) 2007-06-07
ATE386828T1 (de) 2008-03-15
ES2302313T3 (es) 2008-07-01
FR2894255B1 (fr) 2008-04-04
FR2894255A1 (fr) 2007-06-08

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