EP0410955A1 - Procédé pour revêtir les objets plats sur une face par électrodéposition - Google Patents

Procédé pour revêtir les objets plats sur une face par électrodéposition Download PDF

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Publication number
EP0410955A1
EP0410955A1 EP90890216A EP90890216A EP0410955A1 EP 0410955 A1 EP0410955 A1 EP 0410955A1 EP 90890216 A EP90890216 A EP 90890216A EP 90890216 A EP90890216 A EP 90890216A EP 0410955 A1 EP0410955 A1 EP 0410955A1
Authority
EP
European Patent Office
Prior art keywords
detachment
metal
electrolyte
coating
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.)
Granted
Application number
EP90890216A
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German (de)
English (en)
Other versions
EP0410955B1 (fr
Inventor
Gerald Dr. Dipl.-Ing. Maresch
Ulrich Krupicka
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 AG
Original Assignee
Andritz 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 Andritz AG filed Critical Andritz AG
Publication of EP0410955A1 publication Critical patent/EP0410955A1/fr
Application granted granted Critical
Publication of EP0410955B1 publication Critical patent/EP0410955B1/fr
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
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/02—Electroplating of selected surface areas
    • C25D5/028—Electroplating of selected surface areas one side electroplating, e.g. substrate conveyed in a bath with inhibited background plating
    • 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
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings

Definitions

  • the invention relates to a method for the one-sided electrolytic coating of flat workpieces made of steel, in particular steel strips, with a metal or a metal alloy, in particular with a zinc-nickel alloy.
  • the object of the invention was therefore to provide a method which avoids the above-mentioned disadvantage of cementation on the uncoated side.
  • a method which includes the following steps: applying a thin layer of the same material that is intended for the one-sided coating on both sides of the workpiece; subsequent one-sided coating; and finally electrolytic detachment of the thin layer on the side opposite to the side to be coated permanently.
  • the steel strip After passing through the cleaning system 1 in the first cell or in the inlet part 2 in the electroplating system 3, the steel strip is coated on both sides with a zinc-nickel alloy which is intended to avoid chemical cementation of the nickel on this side in the other cells.
  • the one-sided coating with conventional devices (such as current roll as a contact element for the belt, etc.)
  • the coating applied first is detached again in a further cell 5, the so-called "deplating" cell, which is operated with a special electrolyte.
  • An electrolyte based on an aqueous sodium chloride solution has proven to be particularly advantageous.
  • other soluble metal chlorides such as Potassium chloride, magnesium chloride and the like can be used.
  • These hydroxides precipitated from the electrolyte are produced using known methods such as e.g. Settling and / or filtration and hydrocyclones or centrifugation removed from the solution.
  • FIG. 2 shows a diagram of a "deplating" cell constructed in this way.
  • the belt 10 at least runs through Electrode pair 11, 12 and 11 ', 12', of which a part is anodically and a part is connected cathodically.
  • the side of the strip opposite the anode 11, 11 ' is thereby cathodically polarized and the side opposite the cathode 12, 12' is anodically polarized and the alloy is detached from this side.
  • the current required to dissolve the coating is not the same as the current to the coating, but is approximately two to five times that.
  • Electrodes in the detachment cell it is also necessary that they are always completely covered with electrolyte and that the electrolyte level 13 in the cell is higher than the upper edge of the anode in order to avoid the formation of gaseous chlorine.
  • electrolyte level 13 in the cell is higher than the upper edge of the anode in order to avoid the formation of gaseous chlorine.
  • Both stainless steel and nickel or other known electrode materials can be used as the electrode material for the detachment cell and platinum-coated or iridium oxide-coated titanium sheets can also be used as the anode.
  • the temperature range for the electrolyte in the detachment cell is between 20 and 90 ° C, preferably between 40 and 65 ° C.
  • the belt coming from the detachment cell 5 passes through a further rinsing system 4 'and finally a dryer 6.
  • a steel strip was coated on one side with a zinc-nickel alloy in an electrolytic coil coating system.
  • the uncoated side was discolored brown and chemical cementation of the nickel on the uncoated side could be detected in the scanning electron microscope.
  • the plant was thereupon expanded with a detachment cell according to the invention and electrolytically applied a protective layer in the first cell.
  • An aqueous sodium sulfate solution was used as the electrolyte, and the current was supplied for detachment by an anodically connected current roller. When setting a current that corresponded to the theoretical protective layer, this was only partially removed. Only when the current was increased to three times the band was free of the deposited layer, but the surface was discolored light brown after the rinsing process.
  • the surface was free of zinc-nickel residues only after three times the theoretical amount of electricity, but was slightly discolored in brown and some phosphate crystals could be detected on the surface under the scanning electron microscope.

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)
  • Electroplating And Plating Baths Therefor (AREA)
EP90890216A 1989-07-24 1990-07-24 Procédé pour revêtir les objets plats sur une face par électrodéposition Expired - Lifetime EP0410955B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT1778/89A AT393513B (de) 1989-07-24 1989-07-24 Verfahren zur einseitigen elektrolytischen beschichtung flaechiger werkstuecke aus stahl
AT1778/89 1989-07-24

Publications (2)

Publication Number Publication Date
EP0410955A1 true EP0410955A1 (fr) 1991-01-30
EP0410955B1 EP0410955B1 (fr) 1994-02-02

Family

ID=3520775

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90890216A Expired - Lifetime EP0410955B1 (fr) 1989-07-24 1990-07-24 Procédé pour revêtir les objets plats sur une face par électrodéposition

Country Status (8)

Country Link
EP (1) EP0410955B1 (fr)
JP (1) JPH0361397A (fr)
KR (1) KR910003156A (fr)
AT (1) AT393513B (fr)
BR (1) BR9003557A (fr)
CA (1) CA2021654A1 (fr)
DE (1) DE59004484D1 (fr)
YU (1) YU47229B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992021792A1 (fr) * 1991-05-30 1992-12-10 Sikel N.V. Procede et installation pour preparer en continu une bande d'acier munie d'une couche deposee electrolytiquement
EP1081252A1 (fr) * 1999-09-02 2001-03-07 Enthone-OMI (Benelux) B.V. Procédé de placage sélectif
EP1433544A1 (fr) * 2000-08-18 2004-06-30 Ti Group Automotive Systems Limited Procédé de fabrication d'un tube à parois multiples
CN111519221A (zh) * 2020-04-15 2020-08-11 本钢板材股份有限公司 单面电镀锌的加工方法

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10526742B2 (en) * 2015-06-19 2020-01-07 Samsung Electronics Co., Ltd. Washing machine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959099A (en) * 1975-06-18 1976-05-25 Inland Steel Company Electrolytic method of producing one-side-only coated steel
US4464232A (en) * 1982-11-25 1984-08-07 Sumitomo Metal Industries, Lt. Production of one-side electroplated steel sheet

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1076494B (it) * 1975-10-15 1985-04-27 Nat Steel Corp Procedimento per la produzione di lamiera zincata
JPS58181889A (ja) * 1982-04-17 1983-10-24 Nippon Steel Corp 片面亜鉛系電気メツキ鋼板の製造方法
JPS59116391A (ja) * 1982-12-21 1984-07-05 Sumitomo Metal Ind Ltd 片面電気メツキ鋼板の製造方法
JPS5996292A (ja) * 1982-11-25 1984-06-02 Sumitomo Metal Ind Ltd 片面電気メッキ鋼板の製造方法
DD217541A1 (de) * 1983-09-13 1985-01-16 Orsta Hydraulik Veb K Elektrochemisches entzinken und neutralisieren von verzinkten werkstuecken
DE3727246C1 (de) * 1987-08-15 1989-01-26 Rasselstein Ag Verfahren zum galvanischen Beschichten eines Stahlbandes mit einem UEberzugsmetall,insbesondere Zink oder einer zinkhaltigen Legierung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3959099A (en) * 1975-06-18 1976-05-25 Inland Steel Company Electrolytic method of producing one-side-only coated steel
US4464232A (en) * 1982-11-25 1984-08-07 Sumitomo Metal Industries, Lt. Production of one-side electroplated steel sheet

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, Band 103, Nr. 6, 1985, Seite 514, Zusammenfassung Nr. 44861f, Columbus, Ohio, US; & DD-A-217 541 (FISCHER) 16-01-1985 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992021792A1 (fr) * 1991-05-30 1992-12-10 Sikel N.V. Procede et installation pour preparer en continu une bande d'acier munie d'une couche deposee electrolytiquement
EP1081252A1 (fr) * 1999-09-02 2001-03-07 Enthone-OMI (Benelux) B.V. Procédé de placage sélectif
EP1433544A1 (fr) * 2000-08-18 2004-06-30 Ti Group Automotive Systems Limited Procédé de fabrication d'un tube à parois multiples
US6887364B2 (en) 2000-08-18 2005-05-03 Ti Group Automotive Systems Limited Method for manufacturing a multiple walled tube
CN111519221A (zh) * 2020-04-15 2020-08-11 本钢板材股份有限公司 单面电镀锌的加工方法

Also Published As

Publication number Publication date
EP0410955B1 (fr) 1994-02-02
BR9003557A (pt) 1991-08-27
YU47229B (sh) 1995-01-31
CA2021654A1 (fr) 1991-01-25
AT393513B (de) 1991-11-11
DE59004484D1 (de) 1994-03-17
ATA177889A (de) 1991-04-15
YU140790A (sh) 1993-05-28
JPH0361397A (ja) 1991-03-18
KR910003156A (ko) 1991-02-27

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