EP0453432B1 - Verfahren zur Bildung eines Zink-Aluminium-Überzuges auf ein Stahlband - Google Patents

Verfahren zur Bildung eines Zink-Aluminium-Überzuges auf ein Stahlband Download PDF

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Publication number
EP0453432B1
EP0453432B1 EP91870059A EP91870059A EP0453432B1 EP 0453432 B1 EP0453432 B1 EP 0453432B1 EP 91870059 A EP91870059 A EP 91870059A EP 91870059 A EP91870059 A EP 91870059A EP 0453432 B1 EP0453432 B1 EP 0453432B1
Authority
EP
European Patent Office
Prior art keywords
zinc
strip
coating
steel strip
thin layer
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
EP91870059A
Other languages
English (en)
French (fr)
Other versions
EP0453432A1 (de
Inventor
Marcel Lamberigts
Jean-Pierre Servais
Vincent Leroy
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.)
Centre de Recherches Metallurgiques CRM ASBL
Original Assignee
Centre de Recherches Metallurgiques CRM ASBL
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 Centre de Recherches Metallurgiques CRM ASBL filed Critical Centre de Recherches Metallurgiques CRM ASBL
Publication of EP0453432A1 publication Critical patent/EP0453432A1/de
Application granted granted Critical
Publication of EP0453432B1 publication Critical patent/EP0453432B1/de
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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/022—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating
    • C23C2/0222—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by heating in a reactive atmosphere, e.g. oxidising or reducing atmosphere
    • 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
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/026—Deposition of sublayers, e.g. adhesion layers or pre-applied alloying elements or corrosion protection

Definitions

  • the present invention relates to a method for forming a zinc-aluminum dip coating on a steel strip.
  • the dip coating of a continuous steel strip is a technique which has been known and widely applied for many years. Essentially, it consists of running a strip of steel through a bath of molten metal or alloy, then solidifying the coating after adjusting its thickness. Generally, the dip coating operation is preceded by annealing under a reducing atmosphere, in order to rid the surface of the strip of any trace of oxide which may compromise the adhesion of the coating.
  • zinc-aluminum alloys are commonly used, typically containing, by weight, in addition to zinc, 55% of aluminum as well as 1.6% of silicon.
  • Such alloys combine the high corrosion resistance of aluminum and the cathodic protection provided by zinc.
  • the purpose of the addition of silicon is to moderate the reaction between the iron of the steel strip and the aluminum of the coating. In the absence of silicon, this reaction leads in fact to a very significant loss of iron and to a coating completely transformed into Fe-Al which has no adhesion.
  • the coatings have a structure, essentially composed of a metastable mixture of two phases which do not solidify simultaneously; thus zones rich in aluminum and zones rich in zinc appear, which have distinct physical properties and are the seat of internal constraints.
  • a layer of fragile intermetallic particles is formed at the interface between the steel substrate and the zinc-aluminum coating, which degrades adhesion.
  • the silicon added to moderate the reaction between iron and aluminum does not remain entirely in solution; on cooling, it precipitates in the form of needles which are the source of stress concentrations and cause the fragility of the coating.
  • the present invention provides a process for forming a zinc-aluminum dip coating on a steel strip which does not give rise to the aforementioned drawbacks and which allows, by simple and economically acceptable means in industrial operation, to give this coating excellent adhesion and ductility properties without altering its corrosion protection power.
  • a method for forming a zinc-aluminum dip coating on a steel strip consists of electrolytically depositing on said strip, a thin layer of a metal chosen from nickel, cobalt and chromium, annealing said strip, provided with said thin layer, under a protective atmosphere, and then passing said strip thus coated through a zinc bath having a content of aluminum of about 55% by weight and free of silicon.
  • the electrolytic deposition of said thin layer is carried out with a current density of at least 300 A / dm2, and preferably between 350 and 450 A / dm2.
  • the thin layer of metal has in particular the effect of slowing down or preventing the exchanges between the steel substrate on the one hand and the zinc-aluminum coating on the other hand. It thus attenuates the reaction between the iron of the substrate and the aluminum of the coating and contributes to improving the adhesion of the latter. In addition, it avoids the presence of silicon in the zinc-aluminum bath; the zinc-aluminum coating therefore no longer contains embrittling silicon precipitates and its ductility is markedly improved.
  • nickel was deposited in a thin layer, corresponding to approximately 3 g Ni / m2 in double face, on steel panels.
  • An electrolytic solution containing 260 g / l of NiSO4.6H2O and 35 g / l of H3BO3 was used for this purpose, the pH of which was adjusted to 2.5 by addition of sulfuric acid.
  • the current density was 330 A / dm2.
  • the panels were then annealed at 720 ° C under an atmosphere of N2 - 5% H2 for 3 minutes, then they were coated by immersion in a zinc bath containing 55% by weight of aluminum and no silicon.
  • the innermost layers of the reaction zone consist essentially of Fe-Al, with very low percentages of nickel and zinc.
  • the actual coating that is to say the outer layer, consists of two main phases, respectively enriched with aluminum and zinc, which still contain traces of iron. In places, the coating also has particles very rich in nickel.
  • This structure is very resistant to bending at 180 ° over twice the thickness of the panel, as well as to profiling, without notable cracking or chipping.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Coating With Molten Metal (AREA)
  • Heat Treatment Of Sheet Steel (AREA)

Claims (2)

  1. Verfahren zur Bildung eines anhaftenden Überzugs aus Zink-Aluminium auf Stahlband, wobei man eine dünne Schicht eines unter Nickel, Kobalt und Chrom ausgewählten Metalls elektrolytisch auf dem Stahlband abscheidet, das mit der besagten dünnen Schicht versehene Band unter einer Schutzgasatmosphäre glüht und es danach durch ein siliziumfreies Zinkbad mit einem Aluminiumgehalt von etwa 55 Gew.-% laufen laßt.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man die elektrolytische Abscheidung der besagten dünnen Schicht bei einer Stromdichte von mindestens 300 A/dm² durchführt.
EP91870059A 1990-04-17 1991-04-12 Verfahren zur Bildung eines Zink-Aluminium-Überzuges auf ein Stahlband Expired - Lifetime EP0453432B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE9000428A BE1004079A6 (fr) 1990-04-17 1990-04-17 Procede pour former un revetement de zinc-aluminium sur une bande d'acier.
BE9000428 1990-04-17

Publications (2)

Publication Number Publication Date
EP0453432A1 EP0453432A1 (de) 1991-10-23
EP0453432B1 true EP0453432B1 (de) 1994-11-30

Family

ID=3884763

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91870059A Expired - Lifetime EP0453432B1 (de) 1990-04-17 1991-04-12 Verfahren zur Bildung eines Zink-Aluminium-Überzuges auf ein Stahlband

Country Status (5)

Country Link
EP (1) EP0453432B1 (de)
JP (1) JPH0726357A (de)
AT (1) ATE114739T1 (de)
BE (1) BE1004079A6 (de)
DE (1) DE69105340D1 (de)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1521824A (fr) * 1966-05-04 1968-04-19 M & T Chemicals Inc Procédé de dépôt de chrome sur des bandes métalliques
SE393403B (sv) * 1972-08-09 1977-05-09 Bethlehem Steel Corp Sett att overdraga ytan av en jernstreng med en al-zn-legering
SE378118B (de) * 1974-03-14 1975-08-18 Nordstjernan Rederi Ab

Also Published As

Publication number Publication date
DE69105340D1 (de) 1995-01-12
JPH0726357A (ja) 1995-01-27
BE1004079A6 (fr) 1992-09-22
EP0453432A1 (de) 1991-10-23
ATE114739T1 (de) 1994-12-15

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