EP0594520B1 - Feuerverzinkte Stahlgegenstände und Verfahren zur Herstellung - Google Patents

Feuerverzinkte Stahlgegenstände und Verfahren zur Herstellung Download PDF

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Publication number
EP0594520B1
EP0594520B1 EP93470023A EP93470023A EP0594520B1 EP 0594520 B1 EP0594520 B1 EP 0594520B1 EP 93470023 A EP93470023 A EP 93470023A EP 93470023 A EP93470023 A EP 93470023A EP 0594520 B1 EP0594520 B1 EP 0594520B1
Authority
EP
European Patent Office
Prior art keywords
bath
coating
steel
magnesium
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
EP93470023A
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English (en)
French (fr)
Other versions
EP0594520A1 (de
Inventor
Marc Dauzat
Joel Roualdes
Xavier Berjat
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.)
Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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 Sollac SA, Lorraine de Laminage Continu SA SOLLAC filed Critical Sollac SA
Publication of EP0594520A1 publication Critical patent/EP0594520A1/de
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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 invention relates to the coating of steel products, such as steel strips, by immersion of these products in a zinc-based molten metal bath.
  • the continuous galvanizing treatments of the steel strips consist of passing the strips through a container containing a molten metal alloy essentially consisting of zinc, to which variable amounts of aluminum are generally added. A layer of alloy is thus deposited on the strip. On leaving the bath, the thickness of the coating is standardized by a wringing device comprising rollers or, more often, nozzles projecting a gas jet onto the coated strip, while the zinc alloy layer does not has not yet completed its solidification.
  • the document FR 1446872 recommends, in particular, to use a galvanizing bath comprising from 1 to 4% by weight of magnesium and from 0.05 to 5% by weight of aluminum to obtain a coating which is strongly adherent to the product, and it giving good resistance to corrosion.
  • a galvanizing bath comprising from 1 to 4% by weight of magnesium and from 0.05 to 5% by weight of aluminum to obtain a coating which is strongly adherent to the product, and it giving good resistance to corrosion.
  • GALFAN ® comprising a coating containing from 4 to 5% of aluminum can be improved by incorporating up to 1.8% of magnesium into the coating.
  • Document WO-A-89 09 844 describes a process with a molten bath of Zn alloy comprising from 0.3 - 3.5% Al by weight, 100 ppm or less of Pb, 1/100 - 1 part of Si per part of A1 and optionally comprising 0.01 - 1.5% by weight of one or more of metals selected from the group comprising Mg, Mn and Cu.
  • the coatings thus obtained have serious defects, in this case the presence on the coated product of areas comprising "lack of coating” of several »m wide, that is to say areas where the substrate remains bare. . It is likely that the presence of these gaps is due to a phenomenon of partial dewetting of the steel surface during cooling. This is the counterpart of the low wettability of the steel strip by the liquid bath rich in magnesium and of obtaining a thin coating of regular thickness which it promotes.
  • the object of the invention is to galvanize the steel strips with a thin and evenly distributed coating, having good anti-corrosion properties and the thickness of which does not require uniformity, after deposition, by an additional device. .
  • the subject of the invention is a process for galvanizing steel products according to which the coating of said products is carried out by soaking in a molten bath of zinc alloy, characterized in that said alloy comprises in weight percentages 1 to 3 , 5% magnesium, 0.5 to 1.5% aluminum and 0.0010 to 0.0060% silicon.
  • the subject of the invention is also a steel product coated according to this process.
  • the invention consists in adding a small amount of silicon to a zinc alloy bath of the composition indicated above, having favorable employment properties. This resolves the coating quality problems mentioned above, while retaining the possibility of not using a thickness regulating device.
  • micrographic observation of the sample shows that in fact, the coating 2 is distributed over the substrate 1 irregularly. On ranges 3 whose width can vary from 10 to 100 ⁇ m, it can be seen that the coating has only a very small thickness, or is even completely absent.
  • FIG. 2 clearly shows that the addition of silicon to the galvanizing bath results in a spectacular improvement in the quality of the coating 4 deposited on the steel substrate 5 compared to the previous case. Thickness of the covering 4 is always about 10 "m, but this time it has an extremely regular external surface, completely free of the gaps which affected the sample of FIG. 1. On the other hand the external surface of the covering 4 is not disturbed by the irregularities of the surface of the substrate 5. In addition, this coating 4 has remarkable qualities of adhesion to the substrate 5, and very good resistance to folding. Finally, it is checked that it gives a completely satisfactory corrosion resistance to the sample: a salt spray test shows a formation of white rust uniformly distributed over the entire surface of the sample. If a scratch is made on the coating 4 exposing the steel, it does not form red rust but white rust: zinc plays its role of sacrificial protection.

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 (3)

  1. Verfahren zur Feuerverzinkung von Stahlgegenständen, bei dem die Beschichtung der Gegenstände in einem Schmelzbad aus einer Zinklegierung erfolgt, dadurch gekennzeichnet, daß die Legierung, in Gewichtsprozenten, 1 bis 3,5 % Magnesium, 0,5 bis 1,5 % Aluminium und 0,0010 bis 0,0060 % Silizium enthält.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Schmelzbad auf einer Temperatur von 400 bis 450°C gehalten wird und daß der Gegenstand bei einer Temperatur von 350 bis 600°C in dieses Bad getaucht wird.
  3. Stahlgegenstand (5), der mit einer Schicht einer Zinklegierung beschichtet ist, dadurch gekennzeichnet, daß die Legierung, in Gewichtsprozenten, 1 bis 3,5 % Magnesium, 0,5 bis 1,5 % Aluminium und 0,0010 bis 0,0060 % Silizium enthält.
EP93470023A 1992-10-21 1993-09-24 Feuerverzinkte Stahlgegenstände und Verfahren zur Herstellung Expired - Lifetime EP0594520B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9212829A FR2697031B1 (fr) 1992-10-21 1992-10-21 Procédé de galvanisation de produits sidérurgiques et produits sidérurgiques ainsi obtenus.
FR9212829 1992-10-21

Publications (2)

Publication Number Publication Date
EP0594520A1 EP0594520A1 (de) 1994-04-27
EP0594520B1 true EP0594520B1 (de) 1995-12-06

Family

ID=9434910

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93470023A Expired - Lifetime EP0594520B1 (de) 1992-10-21 1993-09-24 Feuerverzinkte Stahlgegenstände und Verfahren zur Herstellung

Country Status (5)

Country Link
EP (1) EP0594520B1 (de)
AT (1) ATE131214T1 (de)
DE (1) DE69300964T2 (de)
ES (1) ES2082617T3 (de)
FR (1) FR2697031B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055799A1 (de) 2007-11-05 2009-05-06 ThyssenKrupp Steel AG Stahlflachprodukt mit einem vor Korrosion schützenden metallischen Überzug und Verfahren zum Erzeugen eines vor Korrosion schützenden metallischen Zn-Mg Überzugs auf einem Stahlflachprodukt

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2571521C (en) * 2004-06-29 2010-05-04 Corus Staal B.V. Steel sheet with hot dip galvanized zinc alloy coating and process to produce it
EP1621645A1 (de) * 2004-07-28 2006-02-01 Corus Staal BV Legiertes heissgetauchtes galvanisiertes Stahlband
RU2470088C2 (ru) * 2010-10-29 2012-12-20 Российская Федерация, от имени которой выступает Министерство промышленности и торговли Российской Федерации (Минпромторг России) Расплав на основе цинка для нанесения защитных покрытий на стальную полосу горячим погружением
WO2012141659A1 (en) 2011-04-13 2012-10-18 U.S. STEEL KOŠICE, s.r.o. Method of production of hot dip galvanized flat steel products with improved corrosion resistance
KR101439694B1 (ko) 2012-12-26 2014-09-12 주식회사 포스코 Zn-Mg 합금도금강판 및 그의 제조방법
WO2015055285A1 (en) * 2013-10-15 2015-04-23 Tata Steel Ijmuiden B.V. Steel substrate with zinc alloy coating
JP7257955B2 (ja) * 2016-08-08 2023-04-14 コロラド・スクール・オブ・マインズ 低い液相線温度を有する改変された溶融亜鉛めっき被膜、その製造方法及び使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56152955A (en) * 1980-04-25 1981-11-26 Nippon Steel Corp Hot dipping composition for steel sheet coated with zinc alloy by hot dipping
JPS6052569A (ja) * 1983-08-31 1985-03-25 Taiyo Seikou Kk カラー亜鉛鉄板用メッキ鋼板の製造方法
JPS60177158A (ja) * 1984-02-23 1985-09-11 Nippon Mining Co Ltd 溶融亜鉛めつき用亜鉛合金
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
JPH0353051A (ja) * 1989-07-21 1991-03-07 Sumitomo Metal Mining Co Ltd 溶融亜鉛めっき処理用のめっき浴

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2055799A1 (de) 2007-11-05 2009-05-06 ThyssenKrupp Steel AG Stahlflachprodukt mit einem vor Korrosion schützenden metallischen Überzug und Verfahren zum Erzeugen eines vor Korrosion schützenden metallischen Zn-Mg Überzugs auf einem Stahlflachprodukt

Also Published As

Publication number Publication date
FR2697031A1 (fr) 1994-04-22
ES2082617T3 (es) 1996-03-16
DE69300964D1 (de) 1996-01-18
FR2697031B1 (fr) 1994-12-16
EP0594520A1 (de) 1994-04-27
DE69300964T2 (de) 1996-07-18
ATE131214T1 (de) 1995-12-15

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