EP0061130B1 - Procédé de dépôt galvanique d'une couche d'alliage zinc-nickel sur un objet métallique, en particulier sur une bande en acier - Google Patents

Procédé de dépôt galvanique d'une couche d'alliage zinc-nickel sur un objet métallique, en particulier sur une bande en acier Download PDF

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Publication number
EP0061130B1
EP0061130B1 EP82102134A EP82102134A EP0061130B1 EP 0061130 B1 EP0061130 B1 EP 0061130B1 EP 82102134 A EP82102134 A EP 82102134A EP 82102134 A EP82102134 A EP 82102134A EP 0061130 B1 EP0061130 B1 EP 0061130B1
Authority
EP
European Patent Office
Prior art keywords
nickel
alloy
zinc
metal object
anodes
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
Application number
EP82102134A
Other languages
German (de)
English (en)
Other versions
EP0061130A1 (fr
Inventor
Richard Elzer
Karl-Heinz Kilian
Johannes Siewert
Hans-Ulrich Weigel
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.)
Rasselstein AG
Original Assignee
Rasselstein 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 Rasselstein AG filed Critical Rasselstein AG
Priority to AT82102134T priority Critical patent/ATE11796T1/de
Publication of EP0061130A1 publication Critical patent/EP0061130A1/fr
Application granted granted Critical
Publication of EP0061130B1 publication Critical patent/EP0061130B1/fr
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/36—Pretreatment of metallic surfaces to be electroplated of iron or steel
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc

Definitions

  • the invention relates to a method for the electrodeposition of a zinc-nickel alloy coating on a metal object, in particular on steel strip, using soluble anodes containing the alloying elements.
  • Strip steels with zinc-nickel alloy coatings are used when corrosion resistance is required. It is important that they retain good corrosion resistance even when deformed. In this regard, known galvanic deposition methods lead to unsatisfactory results.
  • the alloy coating contains a predetermined constant percentage composition of the alloying elements.
  • the deposition of an alloy coating with a constant composition depends on various factors, primarily on the concentration of the various alloy elements in the electrolyte. A simple control of the concentration of the different alloying elements in the electrolyte has so far been practically impossible.
  • the invention has for its object to provide a method for the galvanic deposition of a zinc-nickel alloy coating on a metal object, especially on steel strip, of the type mentioned, which leads to alloy coatings with good corrosion resistance even in the deformed state. Furthermore, it should be possible in a simple manner to control the concentration of the different alloying elements in the electrolyte and thus to deposit a zinc-nickel alloy coating with a desired constant percentage composition.
  • the object is achieved according to the invention in that prior to the galvanic deposition of the alloy coating, an intensive currentless pretreatment of the metal object with the electrolyte at a relative flow rate of at least 2 m / s. and a treatment time of at least 5 seconds.
  • Controlling the concentration of the different alloy elements in the electrolyte and thus the deposition of an alloy coating with a desired constant percentage composition is achieved by connecting the anodes containing different alloy elements to separate power supplies and controlling the current at the anodes separately.
  • the method is expediently carried out in such a way that in each case several anodes of an alloy element, for. B. zinc, arranged in a common anode basket and this to its own, from power supplies to anode baskets, the anodes of another alloy element, for. B. contain nickel, separate power supply connects.
  • an alloy element for. B. zinc
  • the anodes of another alloy element for. B. contain nickel
  • the drawing schematically shows a system for the galvanic deposition of a zinc-nickel alloy coating on a steel strip 1.
  • This steel strip 1 is to be provided with such an alloy coating on one side.
  • the steel strip 1 is connected via the current supply rollers 2 as a cathode.
  • the steel strip 1 Before the steel strip 1 runs through the electrolyte tanks, it is subjected to a pretreatment at 20 on the side to be coated by being electrolessly sprayed with it in order to deposit a zinc-nickel-containing thin primary layer on the strip.
  • An anode basket 4 which is filled with zinc anodes 5, is arranged in a first tank 3 filled with a suitable electrolyte.
  • This anode basket is connected to a power supply 6.
  • the electrical circuit 7 the structure of which is known per se, the current can be controlled as a function of the coating thickness, the belt speed, the belt width and the desired composition of the alloy coating.
  • the current supply 11 to the second anode basket 9 is independent of the first current supply 6.
  • the current at the anode basket 9 can be regulated independently of the anode basket 4 via a circuit 12 corresponding to the circuit 7.
  • Zinc is first dissolved in tank 3 on the steel belt 1 passing through the system from right to left. Nickel is then dissolved in tank 8. The metal is deposited in both tanks 3, 8 as an alloy. The separate current control on the anode baskets 4 and 9 influences the concentration of zinc and nickel in the electrolyte, thereby keeping the composition of the deposited alloy constant in the desired ratio.
  • the electrolyte is the same in both tanks 3, 8 and is supplied to the tanks 3, 8 from a common storage container 13.
  • each anode basket 4 or 9 it would also be conceivable to provide an electrically insulated construction of each anode basket 4 or 9 according to the inlet and outlet strand of the strip 1.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (4)

1. Procédé de dépôt galvanique d'un revêtement d'alliage de zinc-nickel sur un objet métallique, en particulier, sur une bande en acier, en utilisant des anodes solubles contenant les éléments d'alliage, caractérisé en ce que, avant le dépôt galvanique du revêtement d'alliage, on soumet l'objet métallique à un traitement préalable intensif sans courant avec l'électrolyte à une vitesse d'écoulement relative d'au moins 2 m/s et avec un temps de traitement d'au moins 5 secondes.
2. Procédé selon la revendication 1, caractérisé en ce qu'on effectue le traitement préalable en faisant passer l'objet métallique à travers un bain d'électrolyte.
3. Procédé selon la revendication 1, caractérisé en ce qu'on effectue le traitement préalable en pulvérisant l'électrolyte sur l'objet métallique.
4. Procédé selon une des revendications 1 à 3 en utilisant des anodes solubles qui ne contiennent chaque fois qu'un élément d'alliage et que l'ion raccorde à des circuits de courant séparés, caractérisé en ce qu'on règle séparément le courant appliqué aux anodes contenant des éléments d'alliage différents.
EP82102134A 1981-03-17 1982-03-16 Procédé de dépôt galvanique d'une couche d'alliage zinc-nickel sur un objet métallique, en particulier sur une bande en acier Expired EP0061130B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82102134T ATE11796T1 (de) 1981-03-17 1982-03-16 Verfahren zum galvanischen abscheiden eines zink- nickel-legierungsueberzuges auf einem metallgegenstand, insbesondere auf bandstahl.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3110317 1981-03-17
DE3110317 1981-03-17

Publications (2)

Publication Number Publication Date
EP0061130A1 EP0061130A1 (fr) 1982-09-29
EP0061130B1 true EP0061130B1 (fr) 1985-02-13

Family

ID=6127531

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82102134A Expired EP0061130B1 (fr) 1981-03-17 1982-03-16 Procédé de dépôt galvanique d'une couche d'alliage zinc-nickel sur un objet métallique, en particulier sur une bande en acier

Country Status (4)

Country Link
EP (1) EP0061130B1 (fr)
AT (1) ATE11796T1 (fr)
DE (1) DE3262272D1 (fr)
WO (1) WO1982003232A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035233A1 (de) * 2006-07-26 2008-01-31 Mahle International Gmbh Galvanische Oberflächenbeschichtung eines Bauteils

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60228693A (ja) * 1984-04-25 1985-11-13 Kawasaki Steel Corp Ｚｎ−Ｎｉ合金めつき鋼板の製造方法
US4834845A (en) * 1987-08-28 1989-05-30 Kawasaki Steel Corp. Preparation of Zn-Ni alloy plated steel strip
FR2623821B1 (fr) * 1987-11-27 1990-04-20 Renault Couche superficielle protectrice a faible coefficient de frottement
US4822457A (en) * 1988-01-25 1989-04-18 Usx Corporation Method of eliminating a fern-like pattern during electroplating of metal strip
DE3816419C1 (fr) * 1988-05-13 1989-04-06 Rasselstein Ag, 5450 Neuwied, De

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR654734A (fr) * 1927-06-20 1929-04-10 Procédé de chromage des pièces de fonte
US2778787A (en) * 1954-03-15 1957-01-22 British Iron Steel Research Electrodeposition of iron zinc alloys
GB1041761A (en) * 1964-08-13 1966-09-07 Pyrene Co Ltd Improvements in the coating of metals
US4313802A (en) * 1979-02-15 1982-02-02 Sumitomo Metal Industries, Ltd. Method of plating steel strip with nickel-zinc alloy

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006035233A1 (de) * 2006-07-26 2008-01-31 Mahle International Gmbh Galvanische Oberflächenbeschichtung eines Bauteils

Also Published As

Publication number Publication date
DE3262272D1 (en) 1985-03-28
ATE11796T1 (de) 1985-02-15
EP0061130A1 (fr) 1982-09-29
WO1982003232A1 (fr) 1982-09-30

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