EP0664838B1 - Procede de galvanisation en continu - Google Patents

Procede de galvanisation en continu Download PDF

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Publication number
EP0664838B1
EP0664838B1 EP93922530A EP93922530A EP0664838B1 EP 0664838 B1 EP0664838 B1 EP 0664838B1 EP 93922530 A EP93922530 A EP 93922530A EP 93922530 A EP93922530 A EP 93922530A EP 0664838 B1 EP0664838 B1 EP 0664838B1
Authority
EP
European Patent Office
Prior art keywords
bath
zinc
alloy
aluminium
silicon
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 - Lifetime
Application number
EP93922530A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0664838A1 (fr
Inventor
Richard Bruno Sokolowski
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 NV SA
Original Assignee
Union Miniere 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 Union Miniere NV SA filed Critical Union Miniere NV SA
Publication of EP0664838A1 publication Critical patent/EP0664838A1/fr
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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

Definitions

  • the present invention relates to a method for successively producing steel sheet coated with an iron-zinc alloy and conventional galvanized steel sheet in one and the same continuous galvanizing line without interrupting the operation of this line, along which a quantity of steel sheet coated with an iron-zinc alloy is produced by passing steel sheet through a bath of aluminiferous zinc containing less than about 0.15% by weight of aluminum and by subjecting the zinc-coated sheet thus obtained to a diffusion heat treatment so as to convert the layer of zinc present on the sheet into a zinc-iron alloy, and then we proceed directly to the production of a quantity of sheet conventional galvanized steel by bringing the aluminum content of the bath to more than about 0.15%, continuing to pass sheet steel through the bath and eliminating the heat treatment of diffusion.
  • a bath consisting of zinc and 0.10% - ⁇ 0.15% by weight of aluminum is most often used, or a bath consisting of zinc and > 0.15-0.20% by weight of aluminum.
  • the first type of bath is used when the zinc-coated sheet is subjected, after spinning the coating, to a diffusion heat treatment so as to transform the zinc coating into a coating of an iron-zinc alloy, what is commonly called "galvannealing".
  • the second type of bath is used to produce conventional galvanized, that is to say sheet coated with a thin layer of zinc.
  • the bath contains less than 0.12% aluminum, a whole range of iron-zinc compounds is formed at the interface between iron and zinc as described in the zinc-iron phase diagram, which should be avoided in the production of conventional galvanized.
  • aluminum must in fact be greater than 0.15%. It's here this is why the second type of bath has an aluminum content of more than 0.15%.
  • the first type of bath For an aluminum content of approximately 0.15%, a very thin layer of Fe 2 Al 5 alloy is formed on the surface of the steel which will block any subsequent diffusion. This is the reason why the first type of bath has an aluminum content of less than 0.15%.
  • This first type of bath requires the presence of at least about 0.10% aluminum to slow the reaction between iron and zinc during the passage of the sheet in the bath; otherwise this reaction would result in excessive growth of the coating in the bath.
  • the reaction between iron and zinc Although slowed down by aluminum, the reaction between iron and zinc nevertheless causes the formation of iron-zinc mattes which accumulate at the bottom of the bath and which are therefore called bottom mattes. These base mattes cease to be formed as soon as the aluminum content exceeds 0.15%; they therefore do not form in the second type of bath.
  • part of the aluminum reacts with the iron in the sheet to form Fe 2 Al 5 compounds commonly known as floating mattes.
  • the object of the present invention is to provide a method as defined above, which avoids the drawback of this known method.
  • a bath consisting of zinc, aluminum and silicon is used as the bath of aluminiferous zinc, the silicon content ranging from 0.005% to saturation and the aluminum content being at least 0.05% during the production of the steel sheet coated with an iron-zinc alloy and at most 0.5% during the production of the conventional galvanized steel sheet.
  • documents JP-A-4218655 and JP-A-4235266 describe a process for the production of "galvannealed" sheet, in which use is made of a bath consisting of Zn, 0.001-0.2% Si and 0.05-0.20% Al, because silicon and aluminum would improve the machinability of the sheet. Since the bath used corresponds to that used in the process of the present invention, there should be no formation of bottom mat in this known process; however, this fact is not mentioned in these documents.
  • the aluminum content must be at least 0.05% during the production of "galvannealed" sheet, because there is a risk of forming too thick coatings at lower contents. . It should not exceed 0.5% during the production of conventional galvanized sheet, because otherwise there is a risk of causing defects in the continuity of the coating.
  • a silicon content of at least 0.005% is required to avoid the formation of background and aluminum mattes. The bath cannot be supersaturated with silicon, because a supersaturated bath can lead to coating defects.
  • the bath contains at least 0.10% aluminum during the production of "galvannealed" sheet. It is also desirable that the bath contains at least 0.01% and at most 0.10% silicon.
  • compositions can be used at temperatures from 430 to 510 ° C., that is to say at the temperatures which are normally used in continuous galvanizing. It may however be useful to operate at higher temperatures with the compositions containing more than 0.06% of silicon. Needless to say, the compositions having up to 0.14% Al will be used during the production of "galvannealed" sheet and that those having at least 0.16% Al will be used during the production of conventional galvanized.
  • a bath consisting of zinc, aluminum and silicon used in this application, it is meant a bath which contains only these three metals, the impurities inevitably present in these metals and the impurities introduced into the bath by the passage of the sheet.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Coating With Molten Metal (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Manufacturing Of Magnetic Record Carriers (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Inorganic Insulating Materials (AREA)
  • Pyrane Compounds (AREA)
EP93922530A 1992-10-13 1993-10-08 Procede de galvanisation en continu Expired - Lifetime EP0664838B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9212213A FR2696758B1 (fr) 1992-10-13 1992-10-13 Procédé de galvanisation en continu.
FR9212213 1992-10-13
PCT/EP1993/002754 WO1994009173A1 (fr) 1992-10-13 1993-10-08 Procede de galvanisation en continu

Publications (2)

Publication Number Publication Date
EP0664838A1 EP0664838A1 (fr) 1995-08-02
EP0664838B1 true EP0664838B1 (fr) 1996-08-14

Family

ID=9434478

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93922530A Expired - Lifetime EP0664838B1 (fr) 1992-10-13 1993-10-08 Procede de galvanisation en continu

Country Status (17)

Country Link
US (1) US5882733A (fi)
EP (1) EP0664838B1 (fi)
JP (1) JPH08502098A (fi)
AT (1) ATE141339T1 (fi)
AU (1) AU688281B2 (fi)
BR (1) BR9307186A (fi)
CA (1) CA2144963A1 (fi)
DE (1) DE69304079T2 (fi)
ES (1) ES2092837T3 (fi)
FI (1) FI100475B (fi)
FR (1) FR2696758B1 (fi)
GR (1) GR3021535T3 (fi)
HU (1) HU216338B (fi)
PL (1) PL172723B1 (fi)
RU (1) RU2114930C1 (fi)
SK (1) SK282049B6 (fi)
WO (1) WO1994009173A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007048883A1 (fr) 2005-10-27 2007-05-03 Usinor Procede de fabrication d'une piece a tres hautes caracteristiques mecaniques a partir d'une tole laminee et revetue
WO2008025438A1 (en) * 2006-09-01 2008-03-06 Umicore Silicon-bearing zinc alloy for zinc-quench galvanisation

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU525668B2 (en) * 1980-04-25 1982-11-18 Nippon Steel Corporation Hot dip galvanizing steel strip with zinc based alloys
US4330598A (en) * 1980-06-09 1982-05-18 Inland Steel Company Reduction of loss of zinc by vaporization when heating zinc-aluminum coatings on a ferrous metal base
JPS6152337A (ja) * 1984-08-20 1986-03-15 Nippon Mining Co Ltd 溶融亜鉛めつき用亜鉛合金
JPS6240352A (ja) * 1985-08-14 1987-02-21 Sumitomo Metal Ind Ltd 合金化亜鉛めつき鋼板の製造方法
US4987037A (en) * 1987-07-20 1991-01-22 The Ohio State University Galvanic coating with ternary alloys containing aluminum and magnesium
DE3734203A1 (de) * 1987-10-09 1989-04-20 Solms Juergen Verfahren zum feuerverzinken von stahlgegenstaenden mit siliciumgehalten ueber 0,02%
JP2755387B2 (ja) * 1988-04-12 1998-05-20 大洋製鋼株式会社 プレコート鋼板用溶融亜鉛アルミニウム合金めっき鋼板の製造方法およびプレコート鋼板
JP2765078B2 (ja) * 1989-08-03 1998-06-11 住友金属工業株式会社 合金化溶融めっき鋼板およびその製造方法
JP2825675B2 (ja) * 1990-11-14 1998-11-18 新日本製鐵株式会社 加工性に優れた合金化溶融亜鉛めっき鋼板の製造方法
JPH04235266A (ja) * 1991-01-09 1992-08-24 Nippon Steel Corp 加工性及び耐食性に優れた合金化溶融亜鉛めっき鋼板の製造方法

Also Published As

Publication number Publication date
PL172723B1 (pl) 1997-11-28
PL308269A1 (en) 1995-07-24
GR3021535T3 (en) 1997-02-28
FI951700A (fi) 1995-04-10
WO1994009173A1 (fr) 1994-04-28
FI100475B (fi) 1997-12-15
US5882733A (en) 1999-03-16
DE69304079T2 (de) 1997-04-03
AU5149893A (en) 1994-05-09
RU2114930C1 (ru) 1998-07-10
HUT73031A (en) 1996-06-28
FR2696758B1 (fr) 1994-12-16
DE69304079D1 (de) 1996-09-19
FI951700A0 (fi) 1995-04-10
ATE141339T1 (de) 1996-08-15
HU216338B (hu) 1999-06-28
BR9307186A (pt) 1999-03-30
EP0664838A1 (fr) 1995-08-02
CA2144963A1 (fr) 1994-04-28
SK282049B6 (sk) 2001-10-08
ES2092837T3 (es) 1996-12-01
AU688281B2 (en) 1998-03-12
HU9501070D0 (en) 1995-06-28
SK41095A3 (en) 1996-02-07
FR2696758A1 (fr) 1994-04-15
JPH08502098A (ja) 1996-03-05

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