EP0584096B1 - Verfahren zum ein- oder beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl - Google Patents

Verfahren zum ein- oder beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl Download PDF

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Publication number
EP0584096B1
EP0584096B1 EP92908752A EP92908752A EP0584096B1 EP 0584096 B1 EP0584096 B1 EP 0584096B1 EP 92908752 A EP92908752 A EP 92908752A EP 92908752 A EP92908752 A EP 92908752A EP 0584096 B1 EP0584096 B1 EP 0584096B1
Authority
EP
European Patent Office
Prior art keywords
zinc
iron
electrolyte
electrolytic liquid
fact
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
EP92908752A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0584096A1 (de
Inventor
Ulrich Krupicka
Gerald Maresch
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.)
Andritz Patentverwaltungs GmbH
Original Assignee
Andritz Patentverwaltungs GmbH
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 Andritz Patentverwaltungs GmbH filed Critical Andritz Patentverwaltungs GmbH
Publication of EP0584096A1 publication Critical patent/EP0584096A1/de
Application granted granted Critical
Publication of EP0584096B1 publication Critical patent/EP0584096B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/12—Process control or regulation
    • C25D21/14—Controlled addition of electrolyte components
    • 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
    • C25D3/22—Electroplating: Baths therefor from solutions of zinc
    • 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 one-sided and two-sided electrolytic coating of an object connected as a cathode made of steel, preferably a steel strip, or of hot-dip galvanized steel, preferably a hot-dip galvanized steel strip, with zinc or a zinc-iron alloy in a galvanic cell from an aqueous solution of Zinc chloride and iron chloride with a pH of 0.1 to 3.0, preferably 1.0 to 2.0, as the electrolytic liquid using insoluble anodes.
  • Zinc electrolytes of the chloride type in combination with soluble anodes and zinc electrolytes of the sulfate type in combination with soluble and insoluble anodes are used. Examples of such processes are described, for example, in EP-OS 151 235 or DE-OS 34 28 277.
  • the advantages of zinc chloride electrolytes in connection with soluble anodes are described in detail in the literature and essentially concern the improved conductivity and the somewhat better current efficiency compared to sulfate electrolytes. Iron contained in the electrolyte liquid does not get into the coating, or only slightly.
  • WO 91/04359 describes a process for the electrolytic coating of a metal object with zinc or a zinc-iron alloy using insoluble electrodes and an electrolyte of the chloride type, the addition of the content of zinc and or iron in the electrolyte via regeneration tanks he follows.
  • the electrolyte is passed through these containers filled with iron and / or zinc, metal dissolving, after which the regenerated electrolyte liquid is fed back to the coating unit.
  • the object of the present invention is a method of the type specified in the introduction, in which a continuous coating of the object is possible in a simple and economical manner.
  • the object is rinsed electrolessly with the electrolyte liquid prior to the galvanic coating, zinc dissolving, and the electrolyte liquid is fed to the galvanic cell after the object has been rinsed.
  • the currentless rinsing of the object before coating with the electrolyte liquid provided for the coating improves the adhesion of the applied coating on the one hand and furthermore the object itself serves as a source for supplementing the metal content in the electrolyte liquid, so that additional regeneration tanks filled with the metal to be supplemented are used or dissolving columns can be avoided.
  • the zinc coatings deposited according to the above conditions or the zinc-iron coatings show a uniform appearance in the entire current density range used (10 to approx. 200 A / dm) and excellent adhesion and excellent deep-drawing properties were found in deep-drawing tests according to Erichsen.
  • the temperature of the electrolyte liquid is advantageously 20 to 80 ° C., preferably 50 to 60 ° C.
  • the cathodic efficiency of the process according to the invention is between 98 and 100%, and according to an additional feature of the invention, the conductivity of the electrolytic liquid can be increased by adding neutral salts, for example sodium, potassium, ammonium or aluminum chloride with a concentration of 0 to 100 g / l, preferably 30 to 60 g / l, can be improved.
  • neutral salts for example sodium, potassium, ammonium or aluminum chloride with a concentration of 0 to 100 g / l, preferably 30 to 60 g / l, can be improved.
  • the bath voltage is reduced by up to 40% using the conductive salts.
  • a steel strip 1 is provided with a zinc coating in a galvanic section 2 using a zinc electrolyte based on chloride.
  • the electroplating section 2 is filled from a work tank 3, and the electrolyte runs back into this tank 3.
  • part of the electrolyte from the working tank 3 is circulated through a dissolving column 4 which is filled with iron. This replenishes the iron deposited on the steel strip from the electrolyte.
  • Fig. 2 shows schematically a galvanic cell for carrying out the invention, in which the steel strip or the hot-dip galvanized steel strip 1 runs into the cell via a cathodically connected current roller 6, guided vertically to a lower deflection roller 7, and from this again to one above arranged further current roller 6 runs the cell.
  • the current supply to the anodes 8 takes place through insulated pipes or shafts 10.
  • the insoluble anodes 8 consist of a carrier material 8a, on which a coating 8b is applied.
  • the power supply lines 11 are located outside the cell and above the electrolyte bath level 9 and in order to achieve the desired distance of the anode top edge from the bath level 9, the anodes 8 are covered with an insulator 12 in their upper region. It is thereby achieved that the actual anode, namely the section of the entire anode construction which has an effective deposition, is in the desired state Extent is below the liquid level 9 of the electrolyte.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
EP92908752A 1991-05-13 1992-05-13 Verfahren zum ein- oder beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl Expired - Lifetime EP0584096B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0098091A AT397663B (de) 1991-05-13 1991-05-13 Verfahren und vorrichtung zum ein- und beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl
AT980/91 1991-05-13
PCT/AT1992/000068 WO1992020839A1 (de) 1991-05-13 1992-05-13 Verfahren und vorrichtung zum ein- oder beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl

Publications (2)

Publication Number Publication Date
EP0584096A1 EP0584096A1 (de) 1994-03-02
EP0584096B1 true EP0584096B1 (de) 1996-01-10

Family

ID=3504193

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92908752A Expired - Lifetime EP0584096B1 (de) 1991-05-13 1992-05-13 Verfahren zum ein- oder beidseitigen elektrolytischen beschichten eines gegenstandes aus stahl

Country Status (8)

Country Link
US (1) US5637205A (ja)
EP (1) EP0584096B1 (ja)
JP (1) JP2719046B2 (ja)
KR (1) KR100232084B1 (ja)
AT (1) AT397663B (ja)
BR (1) BR9205997A (ja)
DE (1) DE59205029D1 (ja)
WO (1) WO1992020839A1 (ja)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11177763B2 (en) * 2017-06-14 2021-11-16 Thomas E. RUSSELL Metallurgical steel post design for solar farm foundations and increased guardrail durability
JP7111068B2 (ja) * 2019-06-13 2022-08-02 株式会社村田製作所 めっき装置およびめっき方法

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA569442A (en) * 1959-01-20 S. Johnston Samuel Electroplating
US4444629A (en) * 1982-05-24 1984-04-24 Omi International Corporation Zinc-iron alloy electroplating baths and process
JPS60121293A (ja) * 1983-12-03 1985-06-28 Kawasaki Steel Corp Ζｎ−Ｆｅ合金を主体とするΖｎ−Ｆｅ系合金電気めっき鋼板の製造方法
US5246563A (en) * 1988-09-14 1993-09-21 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Process for the electrolytic zinc coating of stainless steel
AT392089B (de) * 1988-09-14 1991-01-25 Andritz Ag Maschf Verfahren zum ein- und beidseitigen elektrolytischen verzinken von edelstahl
GB8921439D0 (en) * 1989-09-22 1989-11-08 Electricity Council Improvements in or relating to the electrodeposition of zinc or zinc alloy coatings

Also Published As

Publication number Publication date
DE59205029D1 (de) 1996-02-22
JPH06507205A (ja) 1994-08-11
AT397663B (de) 1994-06-27
WO1992020839A1 (de) 1992-11-26
BR9205997A (pt) 1995-11-14
EP0584096A1 (de) 1994-03-02
US5637205A (en) 1997-06-10
KR100232084B1 (ko) 1999-12-01
JP2719046B2 (ja) 1998-02-25
ATA98091A (de) 1993-10-15

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