EP2224037A1 - Procédé de passivation de bandes de substrat métallique - Google Patents

Procédé de passivation de bandes de substrat métallique Download PDF

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Publication number
EP2224037A1
EP2224037A1 EP09002068A EP09002068A EP2224037A1 EP 2224037 A1 EP2224037 A1 EP 2224037A1 EP 09002068 A EP09002068 A EP 09002068A EP 09002068 A EP09002068 A EP 09002068A EP 2224037 A1 EP2224037 A1 EP 2224037A1
Authority
EP
European Patent Office
Prior art keywords
bath
chromium
passivation
metal substrate
iii
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.)
Ceased
Application number
EP09002068A
Other languages
German (de)
English (en)
Inventor
Heinz Walter Siekmann
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.)
Hd Lenzen Bandverzinkung & Co KG GmbH
Original Assignee
Hd Lenzen Bandverzinkung & Co KG 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 Hd Lenzen Bandverzinkung & Co KG GmbH filed Critical Hd Lenzen Bandverzinkung & Co KG GmbH
Priority to EP09002068A priority Critical patent/EP2224037A1/fr
Publication of EP2224037A1 publication Critical patent/EP2224037A1/fr
Ceased legal-status Critical Current

Links

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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/48—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/53—Treatment of zinc or alloys based thereon
    • 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
    • C25D5/48—After-treatment of electroplated surfaces
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/10—Use of solutions containing trivalent chromium but free of hexavalent chromium

Definitions

  • the invention relates to a method for the passivation of metal substrate strips, in particular galvanized steel strips in a continuous process.
  • the corrosion protection of zinc is based on the fact that it is less noble than the metallic material itself and therefore initially corroded itself, whereby the steel strip itself remains intact.
  • the surfaces are regularly subjected to an additional passivation treatment. Part of it dissolves of protective metal and is integrated into an oxide film on the metal surface. This film is called a passivation layer.
  • passivation layers are comparatively thin and usually have a thickness of up to 3 ⁇ m.
  • the invention aims to remedy this situation.
  • the invention has for its object to provide a method for passivation of metal substrate strips, in particular of galvanized steel strips in a continuous process, which when using chromium (III) solutions at least equivalent corrosion protection previous chromium "VI" -based passivation process allows. According to the invention, this object is solved by the features of the characterizing part of patent claim 1.
  • the invention provides a method for passivating metal substrate strips by means of chromium (III) -based passivation systems, which allows at least equivalent corrosion resistance to previous chromium (VI) -based passivation methods.
  • the bath temperature is heated via a plastic heat exchanger. It has been found that conventional stainless steel heat exchangers in such baths have only a very short service life.
  • the belt is at a speed of between 25 and 35 m / min. moved through the bathroom. Good results were obtained at a speed of 30 m / min. scored per second.
  • the bath is adjusted to a temperature of between 35 ° C and 40 ° C. In this temperature range, good layer properties can be achieved.
  • the stated object is further achieved by a device for carrying out the aforementioned method.
  • the device comprises at least one chromating bath, in which at least one plastic heat exchanger is arranged.
  • the plastic heat exchanger allows a uniform setting of the temperature to the preferred temperature range between 35 ° and 40 °.
  • the chromating bath is heated to a temperature of 35 ° C via a plastic heat exchanger placed in the bath.
  • the galvanized steel strip is passed through the bath at a speed of 30 meters per minute. Subsequently, the steel strip is rinsed several times with running water and then fed to a drying stage.
  • the applied passivation layer has a bluish color and is chromium (VI) free.
  • the passivated steel strip was subsequently subjected to a corrosion test according to DIN 50 021, whereby the achieved corrosion protection performance amounted to 72 hours. In contrast to the chromium (VI) process used to date for the passivation of steel strips, which achieve a corrosion protection performance of 48 hours, this means an increase in corrosion performance to 150%.
  • Previous chromium (III) processes used in continuous passband steel passivation which are carried out at room temperature, only allow a corrosion rate of 6 hours (based on white rust in each case).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)
EP09002068A 2009-02-13 2009-02-13 Procédé de passivation de bandes de substrat métallique Ceased EP2224037A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09002068A EP2224037A1 (fr) 2009-02-13 2009-02-13 Procédé de passivation de bandes de substrat métallique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP09002068A EP2224037A1 (fr) 2009-02-13 2009-02-13 Procédé de passivation de bandes de substrat métallique

Publications (1)

Publication Number Publication Date
EP2224037A1 true EP2224037A1 (fr) 2010-09-01

Family

ID=40756219

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09002068A Ceased EP2224037A1 (fr) 2009-02-13 2009-02-13 Procédé de passivation de bandes de substrat métallique

Country Status (1)

Country Link
EP (1) EP2224037A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2351153A1 (de) * 1972-11-29 1974-06-12 Parker Sangyo Co Ltd Verfahren zur verhinderung einer ablagerung von schlamm an der oberflaeche von teilen einer anlage zur behandlung von metalloberflaechen
GB2144773A (en) * 1983-07-19 1985-03-13 Omi Int Corp Non-peroxide trivalent chromium passivation
US4578122A (en) * 1984-11-14 1986-03-25 Omi International Corporation Non-peroxide trivalent chromium passivate composition and process
US20030145909A1 (en) * 2002-01-24 2003-08-07 Pavco, Inc. Trivalent chromate conversion coating
WO2003083171A1 (fr) * 2002-04-02 2003-10-09 Seamless Plating (Uk) Limited Solution de revetement par conversion
DE10309908B4 (de) * 2003-03-07 2006-12-14 Benteler Stahl/Rohr Gmbh Verfahren zur Herstellung eines verzinkten und mit einem Polymer beschichteten Stahlrohrs

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2351153A1 (de) * 1972-11-29 1974-06-12 Parker Sangyo Co Ltd Verfahren zur verhinderung einer ablagerung von schlamm an der oberflaeche von teilen einer anlage zur behandlung von metalloberflaechen
GB2144773A (en) * 1983-07-19 1985-03-13 Omi Int Corp Non-peroxide trivalent chromium passivation
US4578122A (en) * 1984-11-14 1986-03-25 Omi International Corporation Non-peroxide trivalent chromium passivate composition and process
US20030145909A1 (en) * 2002-01-24 2003-08-07 Pavco, Inc. Trivalent chromate conversion coating
WO2003083171A1 (fr) * 2002-04-02 2003-10-09 Seamless Plating (Uk) Limited Solution de revetement par conversion
DE10309908B4 (de) * 2003-03-07 2006-12-14 Benteler Stahl/Rohr Gmbh Verfahren zur Herstellung eines verzinkten und mit einem Polymer beschichteten Stahlrohrs

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