EP0401727A2 - Procédé pour modifier la qualité de la surface de matériaux contenant du fer avec un revêtement à base d'un alliage d'aluminium-zinc - Google Patents

Procédé pour modifier la qualité de la surface de matériaux contenant du fer avec un revêtement à base d'un alliage d'aluminium-zinc Download PDF

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Publication number
EP0401727A2
EP0401727A2 EP90110563A EP90110563A EP0401727A2 EP 0401727 A2 EP0401727 A2 EP 0401727A2 EP 90110563 A EP90110563 A EP 90110563A EP 90110563 A EP90110563 A EP 90110563A EP 0401727 A2 EP0401727 A2 EP 0401727A2
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EP
European Patent Office
Prior art keywords
zinc
coating
aluminum
improving
aluminium
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
EP90110563A
Other languages
German (de)
English (en)
Other versions
EP0401727A3 (fr
EP0401727B1 (fr
Inventor
Rene Dipl.-Ing. Theillout
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.)
Krupp Hoesch Stahl AG
Original Assignee
Hoesch Stahl AG
Krupp Hoesch Stahl 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
Application filed by Hoesch Stahl AG, Krupp Hoesch Stahl AG filed Critical Hoesch Stahl AG
Priority to AT90110563T priority Critical patent/ATE101660T1/de
Publication of EP0401727A2 publication Critical patent/EP0401727A2/fr
Publication of EP0401727A3 publication Critical patent/EP0401727A3/fr
Application granted granted Critical
Publication of EP0401727B1 publication Critical patent/EP0401727B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C2/26—After-treatment
    • C23C2/265—After-treatment by applying solid particles to the molten coating

Definitions

  • the invention relates to a method for improving the surface quality of steel sheets and strips, which are coated with a corrosion protection.
  • This corrosion protection is achieved by a coating with an aluminum-zinc alloy, which provides the continuous strip with an intermetallic layer in an immersion bath.
  • US Pat. No. 3,148,081 describes a method for improving the coated steel strips on their surface. Without changing the chemical composition, the zinc flower formation is to be achieved by sudden solidification of the molten coating, the surface then being further treated. However, the melt is a zinc alloy with the addition of lead, cadmium and aluminum.
  • Coatings that contain a high proportion of zinc as an alloy component usually produce large-flowered surface structures, the so-called zinc flowers. These structures can be so pronounced that the possible uses, in particular in the case of sheets and strips, are restricted. There is always a restriction if the tapes are subsequently to be coated or varnished. In this case there is a non-uniform surface with the structures of the zinc flowers shining through.
  • An approximately uniform surface is obtained in particular by spraying finely divided particles of zinc against the zinc coating before its crystallization has taken place.
  • a method for spraying the surface has become known from DE-PS 28 12 370.
  • Powdered zinc is generally used in this process.
  • the zinc particles come into contact with the liquid zinc coating of the sheet by spraying and form an intimate connection.
  • Numerous crystalline nuclei are generated. These germs determine and favor the formation and growth of crystals in large numbers. Because there are many germs, the crystals can only take a very small form.
  • EP-PS 0122 856 has found a process for improving the surface of coated steel strips by using an oxygen-free gas to transport the substance to be sprayed on. Since the substances to be sprayed on generally have a great affinity for oxygen, this is intended to prevent oxidation because the oxides formed act as defects on the strip material.
  • AT-E 30 602 B describes a process for optimizing the solidification of zinc on a steel strip.
  • the subject of this application is a temperature control in order to spray on the zinc dust just before the solidification point of the zinc coating.
  • this is very difficult and very difficult to carry out in a large process with many influencing parameters.
  • the steel strips are galvanized.
  • Another way of preventing the formation of large-area zinc flowers is to produce the above-described microflowers by spraying water or water vapor onto the as yet unconsolidated zinc surface with simultaneous strong cooling.
  • the object of the invention is to improve the surface structures of aluminum-zinc coatings on steel sheets or strips and to standardize them so that the sheets and strips have a uniform surface during a subsequent surface coating. This would represent a decisive improvement in quality that could not be achieved with previously known processes, even with dressing.
  • the object is achieved in that zinc dust is blown onto the strip coming from the melt, onto the surface of the aluminum-zinc coating which has not yet solidified. This zinc dust penetrates the surface and forms a connection with the coating, which prevents the formation of structures. After the zinc dust has been inflated, the coated strip must be cooled at a high cooling rate of at least 25 ° C / s. At the same time, the required properties of the tape are retained with this treatment.
  • the pretreated steel strip (1) runs over a deflection roller (5) through the furnace nose (3) into the liquid melt (2) of the aluminum-zinc alloy.
  • the strip steel (1) is guided out of the melt (2) again via the deflection rollers (4). So that the aluminum-zinc coating receives a defined thickness, is by Blown off the excess nozzles (6).
  • the steel strip (1) then enters the pollination system (7).
  • the still liquid strip coating is additionally blown with zinc dust or a zinc dust mixture.
  • the inflated dust crystallizes with the alloy coating and thus forms an intimate bond with the steel strip.
  • the amount of zinc dust inflated determines the surface of the steel strip.
  • the continuous surface-treated steel strip is cooled. This cooling has to happen very quickly. The cooling rate must therefore be at least 25 ° C / s.
  • the surface is further standardized in a subsequent roll pass. Rapid cooling of the steel strip (12) after dusting causes the alloy to solidify and a structureless surface is obtained.
  • Fig. 2 shows the surface of a normal aluminum-zinc coating. The formation of flowers is clearly visible.
  • Fig. 3 shows the same surface in 100 times magnification. Despite this surface being redesigned, there is no uniform surface. 4 shows a surface of an aluminum-zinc coating, which was additionally blown with zinc dust before solidification. The area is much more uniform, as the enlargement in FIG. 5 shows.
  • FIG. 6 shows very clearly the crystalline structure of a conventional aluminum-zinc coating.
  • FIGS. 7 a, 7 b, 7 c show the same sample, but in this case as an edge grinding with a 500-fold magnification.
  • the aluminum-rich dendrites (8) in the alloy layer are clearly visible here.
  • the zinc-rich interdendrite areas which are still very small in this sample, are located between the dendrites (8) due to the low proportion of alloys.
  • Fig. 7 c also makes it clear that the formation of the Si particles (11) in the coating and in the intermetallic alloy layer (10) at the coating / steel interface is not influenced by the zinc dusting.
  • 8 shows a microstructure at the same magnification ratios, which is achieved by dusting with zinc dust.
  • the zinc-rich intendendrite area (9) has become significantly larger, which results in a unification of the surface.

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)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Golf Clubs (AREA)
  • Chemically Coating (AREA)
  • Prevention Of Electric Corrosion (AREA)
EP90110563A 1989-06-07 1990-06-05 Procédé pour modifier la qualité de la surface de matériaux contenant du fer avec un revêtement à base d'un alliage d'aluminium-zinc Expired - Lifetime EP0401727B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90110563T ATE101660T1 (de) 1989-06-07 1990-06-05 Verfahren zur verbesserung der oberflaechenbeschaffenheit von eisenhaltigen materialien mit einem aluminium-zinklegierungs¨berzug.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3918503 1989-06-07
DE3918503 1989-06-07

Publications (3)

Publication Number Publication Date
EP0401727A2 true EP0401727A2 (fr) 1990-12-12
EP0401727A3 EP0401727A3 (fr) 1991-09-25
EP0401727B1 EP0401727B1 (fr) 1994-02-16

Family

ID=6382217

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110563A Expired - Lifetime EP0401727B1 (fr) 1989-06-07 1990-06-05 Procédé pour modifier la qualité de la surface de matériaux contenant du fer avec un revêtement à base d'un alliage d'aluminium-zinc

Country Status (4)

Country Link
EP (1) EP0401727B1 (fr)
AT (1) ATE101660T1 (fr)
DE (2) DE4008738C1 (fr)
ES (1) ES2019264T3 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148081A (en) * 1962-01-02 1964-09-08 Nat Steel Corp Galvanized flat rolled product and its manufacture
DE1521148B2 (de) * 1964-07-14 1975-09-18 Bethlehem Steel Corp., Bethlehem, Pa. (V.St.A.) Eisenhaltiger Metallgegenstand mit einem Aluminium-Zink-Legierungsüberzug und Verfahren zu seiner Herstellung
DE2812370C2 (de) * 1977-04-11 1985-05-30 Heurtey Métallurgie, Paris Vorrichtung zur Oberflächenbehandlung von verzinkten Blechen
EP0122856B1 (fr) * 1983-04-13 1988-06-01 Galvanor Ziegler Procédé et installation pour le revêtement en continu d'une bande à l'aide d'un revêtement oxydable

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2566432A1 (fr) * 1984-06-22 1985-12-27 Usinor Procede et dispositif d'optimisation dans un procede de reduction de la dimension du fleurage d'une bande d'acier galvanise

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3148081A (en) * 1962-01-02 1964-09-08 Nat Steel Corp Galvanized flat rolled product and its manufacture
DE1521148B2 (de) * 1964-07-14 1975-09-18 Bethlehem Steel Corp., Bethlehem, Pa. (V.St.A.) Eisenhaltiger Metallgegenstand mit einem Aluminium-Zink-Legierungsüberzug und Verfahren zu seiner Herstellung
DE2812370C2 (de) * 1977-04-11 1985-05-30 Heurtey Métallurgie, Paris Vorrichtung zur Oberflächenbehandlung von verzinkten Blechen
EP0122856B1 (fr) * 1983-04-13 1988-06-01 Galvanor Ziegler Procédé et installation pour le revêtement en continu d'une bande à l'aide d'un revêtement oxydable

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
DERWENT ACCESSION NO. 79-08 824B (05), Questel Telesystems WPI, DERWENT PUBLICATION LTD., London *
PATENT ABSTRACTS OF JAPAN, unexamined applications, C Feld, Band 7, Nr. 69 (C-158)(1214), 23. MÛrz 1983 THE PATENT OFFICE JAPANESE GOVERNMENT *

Also Published As

Publication number Publication date
DE59004581D1 (de) 1994-03-24
ES2019264T3 (es) 1994-06-01
EP0401727A3 (fr) 1991-09-25
DE4008738C1 (en) 1990-11-08
EP0401727B1 (fr) 1994-02-16
ATE101660T1 (de) 1994-03-15
ES2019264A4 (es) 1991-06-16

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