EP0202870A1 - Apparatus and method for anodic treatment - Google Patents

Apparatus and method for anodic treatment Download PDF

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Publication number
EP0202870A1
EP0202870A1 EP86303710A EP86303710A EP0202870A1 EP 0202870 A1 EP0202870 A1 EP 0202870A1 EP 86303710 A EP86303710 A EP 86303710A EP 86303710 A EP86303710 A EP 86303710A EP 0202870 A1 EP0202870 A1 EP 0202870A1
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EP
European Patent Office
Prior art keywords
dilute
electrodes
treatment
electrical current
salts
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.)
Withdrawn
Application number
EP86303710A
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German (de)
English (en)
French (fr)
Inventor
David Reznik
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0202870A1 publication Critical patent/EP0202870A1/en
Withdrawn legal-status Critical Current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
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/06—Wires; Strips; Foils
    • C25D7/0614—Strips or foils
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/005—Apparatus specially adapted for electrolytic conversion coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
    • C25D11/02—Anodisation
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F1/00—Electrolytic cleaning, degreasing, pickling or descaling

Definitions

  • the present invention relates to methods and apparatus for surface treatment of metal surfaces and more particularly to surface treatment which enhances adhesion and prevents blistering of organic coatings applied thereto.
  • Applicant's U.S. Patent 4,448,475 recommends the provision of a direct anodic electrical connection to the metal surface to be treated and the placement of anodes in the treatment solution. It indicates the possibility of treatment also without such electrical connections.
  • the present invention seeks to provide a highly efficient and cost effective technique for surface treatment of metals.
  • This treatment may be applied advantageously to any metal surface for enhancing the adhesion of coating thereon and may be applied simultaneously with other treatments, when suitable.
  • a method for anodic surface treatment of metal surfaces comprising the steps of providing a treatment container containing a treatment solution comprising one or more of the following substances: tap water, dilute nitrate'salts, dilute hydrochloric acid, dilute nitrite salts, dilute sulfuric acid, stannous and stannic salts and dilute nitric acid, positioning at least first and second electrodes in the treatment container, applying AC electrical current across the electrodes and causing a metal element to be located in the treatment container during application of the AC electrical current across the electrodes.
  • apparatus for surface treatment of metal surfaces comprising a treatment container containing a treatment solution comprising one or more of the following substances: tap water, dilute nitrate salts, dilute hydrochloric acid, dilute nitrite salts, dilute sulfuric acid, stannous and stannic salts and dilute nitric acid, at least first and second electrodes disposed in the treatment container, means for applying AC electrical current across the electrodes and means for causing a metal element to be located in the treatment container during application of the AC electrical current across the electrodes.
  • the metal element comprises a web of metal, such as rolled plate steel, tinned or untinned, and there are provided electrodes adjacent both sides of the web to provide treatment of both metal surfaces.
  • the AC electrical current is provided at line voltage or higher and at a frequency of the mains, e.g. 60 Hz.
  • the treatment solution can be a tin plating solution such as a tin salt solution such a sodium stannate Na Sn0 .
  • a tin salt solution such as sodium stannate Na Sn0 .
  • the surface treatment may occur simultaneously with a tin coating step.
  • the metal element may be maintained uncoupled to a fixed source of electrical potential and thus "floating".
  • non-conductive rollers may be employed for feeding and guiding coil of metal to be treated.
  • a method for anodic surface treatment of metal surfaces comprising the steps of providing a treatment container containing a treatment solution comprising one or more of the following substances: tap water, dilute nitrate salts, dilute hydrochloric acid, dilute nitrite salts, dilute sulfuric acid, stannous and stannic salts and dilute nitric acid, positioning at least first and second electrodes in the treatment container applying DC electrical current across the electrodes at a voltage in excess of Volts, and causing a metal element to be located in the treatment container during application of the AC electrical current across the electrodes.
  • Fig. 1 illustrates apparatus for surface treatment constructed and operative in accordance with a preferred embodiment of the invention.
  • a strip of sheet metal 10 such as a tinplate or uncoated steel, disposed in a bath 12 containing a treatment solution 14.
  • the sheet metal is typically left "floating", not being coupled to a source of electrical potential and thus may be guided by ordinary non-conductive rollers 16, which may be formed of rubber or of any other suitable material.
  • the electrodes are normally distributed so as to lie adjacent both surfaces of the sheet metal 10, so as to provide treatment of both of these surfaces.
  • AC current is applied across one or both pairs of electrodes A,B and C,D.
  • DC current is used. If for example the C electrode is coupled to a positive voltage and the D electrode is coupled to a negative voltage, the metal surface facing the D electrode, i.e. the negative electrode, receives the surface treatment.
  • electrical current of 5 - 150 Amps at a voltage of 12 - 500 Volts and a frequency of 60 - 440 Hz is supplied by a suitable power supply 20 or directly from the mains across the electrodes.
  • the metal sheet may be fed through the bath at a typical speed of 600 meters per minute so as to have a typical dwell time of 0.05 - 0.5 seconds.
  • Example II Under the same conditions as in Example I, a treatment solution of 1:2 stannate industrial tinning solution was employed, providing efficient surface treatment.

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  • 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)
EP86303710A 1985-05-17 1986-05-15 Apparatus and method for anodic treatment Withdrawn EP0202870A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73536785A 1985-05-17 1985-05-17
US735367 1985-05-17

Publications (1)

Publication Number Publication Date
EP0202870A1 true EP0202870A1 (en) 1986-11-26

Family

ID=24955457

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86303710A Withdrawn EP0202870A1 (en) 1985-05-17 1986-05-15 Apparatus and method for anodic treatment

Country Status (4)

Country Link
EP (1) EP0202870A1 (xx)
JP (1) JPS6217198A (xx)
AU (1) AU5751686A (xx)
ZA (1) ZA863692B (xx)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006231A2 (fr) * 1990-10-08 1992-04-16 Le Four Industriel Belge S.A. Procede et dispositif de decapage, ainsi que procede et installation de galvanisation
WO2010055145A1 (de) * 2008-11-13 2010-05-20 Voestalpine Stahl Gmbh Verfahren zum herstellen eines elektrolytisch verzinkten hochfesten stahlbleches
DE102011002836A1 (de) 2011-01-18 2012-07-19 Henkel Ag & Co. Kgaa Vorbehandlung von Weißblech vor einer Lackierung
DE102011002837A1 (de) 2011-01-18 2012-07-19 Henkel Ag & Co. Kgaa Mehrstufige Vorbehandlung von Weißblech vor einer Lackierung

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1496808A1 (de) * 1965-04-30 1970-09-10 Gen Dynamics Corp Verfahren zur elektrolytischen Entfernung von Zunder oder einer Walzhaut von Metalloberflaechen
DE2646697A1 (de) * 1975-10-15 1977-04-28 Nat Steel Corp Verfahren zum behandeln von verzinktem metallband
US4448475A (en) * 1981-07-07 1984-05-15 David Reznick Method and apparatus for treatment of tinned metal surfaces and treated tinned metal surface

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1496808A1 (de) * 1965-04-30 1970-09-10 Gen Dynamics Corp Verfahren zur elektrolytischen Entfernung von Zunder oder einer Walzhaut von Metalloberflaechen
DE2646697A1 (de) * 1975-10-15 1977-04-28 Nat Steel Corp Verfahren zum behandeln von verzinktem metallband
US4448475A (en) * 1981-07-07 1984-05-15 David Reznick Method and apparatus for treatment of tinned metal surfaces and treated tinned metal surface

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, unexamined applications, C field, vol. 8, no. 193, September 5, 1984 THE PATENT OFFICE JAPANESE GOVERNMENT page 94 C 241 * JP-A 59 85 893 (SHIN NIPPON SEITETSU K.K.) * *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992006231A2 (fr) * 1990-10-08 1992-04-16 Le Four Industriel Belge S.A. Procede et dispositif de decapage, ainsi que procede et installation de galvanisation
WO1992006231A3 (fr) * 1990-10-08 1992-11-26 Four Industriel Belge Procede et dispositif de decapage, ainsi que procede et installation de galvanisation
US5449447A (en) * 1990-10-08 1995-09-12 Le Four Industriel Belge S.A. Method and device for pickling and galvanizing
WO2010055145A1 (de) * 2008-11-13 2010-05-20 Voestalpine Stahl Gmbh Verfahren zum herstellen eines elektrolytisch verzinkten hochfesten stahlbleches
DE102011002836A1 (de) 2011-01-18 2012-07-19 Henkel Ag & Co. Kgaa Vorbehandlung von Weißblech vor einer Lackierung
DE102011002837A1 (de) 2011-01-18 2012-07-19 Henkel Ag & Co. Kgaa Mehrstufige Vorbehandlung von Weißblech vor einer Lackierung
WO2012097926A1 (de) 2011-01-18 2012-07-26 Henkel Ag & Co. Kgaa VORBEHANDLUNG VON WEIßBLECH VOR EINER LACKIERUNG
WO2012097927A1 (de) 2011-01-18 2012-07-26 Henkel Ag & Co. Kgaa Mehrstufige vorbehandlung von weissblech vor einer lackierung
CN103429795A (zh) * 2011-01-18 2013-12-04 汉高股份有限及两合公司 用漆涂布之前的马口铁的多级预处理
CN103429795B (zh) * 2011-01-18 2016-04-20 汉高股份有限及两合公司 用漆涂布之前的马口铁的多级预处理
US9909227B2 (en) 2011-01-18 2018-03-06 Henkel Ag & Co. Kgaa Pretreatment of tinplate prior to the coating thereof with lacquer
US10011915B2 (en) 2011-01-18 2018-07-03 Henkel Ag & Co. Kgaa Multistage pretreatment of tinplate prior to the coating thereof with lacquer

Also Published As

Publication number Publication date
JPS6217198A (ja) 1987-01-26
ZA863692B (en) 1987-03-25
AU5751686A (en) 1986-11-20

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