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WO1997035041A1 - Procede de galvanisation a chaud sans flux - Google Patents

Procede de galvanisation a chaud sans flux Download PDF

Info

Publication number
WO1997035041A1
WO1997035041A1 PCT/EP1997/001174 EP9701174W WO9735041A1 WO 1997035041 A1 WO1997035041 A1 WO 1997035041A1 EP 9701174 W EP9701174 W EP 9701174W WO 9735041 A1 WO9735041 A1 WO 9735041A1
Authority
WO
WIPO (PCT)
Prior art keywords
articles
process according
water
rinsing
zinc
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
PCT/EP1997/001174
Other languages
English (en)
Inventor
Michael Gilles
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.)
Umicore NV SA
Original Assignee
Union Miniere NV SA
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 Union Miniere NV SA filed Critical Union Miniere NV SA
Priority to AU20965/97A priority Critical patent/AU2096597A/en
Publication of WO1997035041A1 publication Critical patent/WO1997035041A1/fr
Anticipated expiration legal-status Critical
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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • 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
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/02—Pretreatment of the material to be coated, e.g. for coating on selected surface areas
    • C23C2/024—Pretreatment of the material to be coated, e.g. for coating on selected surface areas by cleaning or etching

Definitions

  • the present invention relates to a process of fluxless hot dip galvanizing steel articles comprising the steps of (a) applying a thin metal layer to the articles in an aqueous medium,
  • step (c) consists in subjecting the articles to a drying operation in a drying station.
  • the aim of the present invention is to provide a process such as defined hereinbefore, which avoids the drying operation in a drying station of the known process.
  • step (c) consists in rinsing the articles with a water-miscible organic liquid and any intentional drying treatment of the articles is omitted between the end of step (c) and the beginning of step (d), which means that during their transport from the outlet of the station, wherein step (c) is carried out, to the surface of the galvanizing bath, the articles are only exposed to the temperatures that inevitably prevail in a hot dip galvanizing plant.
  • the articles will enter the galvanizing bath in the dry state, when the time required for the said transport is relatively long and/or when the organic liquid is relatively volatile; they will enter the galvanizing bath, while still covered by a film of the organic liquid, when the said time is relatively short and/or when the organic liquid has a relatively low volatility.
  • the process of the present invention is based on the discovery that excellent results are achieved in step (d), even if the articles entering the galvanizing bath are still covered by a film of the organic liquid.
  • the articles are degreased, pickled and rinsed with water before being subjected to step (a); - in principle, all metals which protect the article surface against oxidation in such a manner that a reaction with the galvanazing bath can take place on the entire article surface are suitable for coating the article with the thin metal layer; suitable metals are, for example, aluminium, lead, cadmium, copper, nickel, cobalt, bismuth, zinc, tin, indium and also alloys of these metals, the thin metal layer can be applied, for example, by electrochemical deposition, cementation or chemically reductive (electroless) deposition, the thin metal layer can be deposited simultaneously with a pickling and/or degreasing operation, - the thickness of the thin metal layer on the articles can be very small; preferably it should be below 1 ⁇ m, it is not necessary for this protective thin metal layer to be free of pores
  • the organic liquid may consist of at least one of methanol (CH 3 OH), ethanol (C 2 H 5 OH), 1 -propanol (CH 3 -CH2-CH 2 OH), 2-propanol (CH 3 -CHOH-CH 3 ), tert-butanol ((CH 3 ) 3 COH), allylalcohol (CH 2 --CH-CH 2 OH), 1 ,2-ethaned ⁇ ol (CH 2 OH-CH 2 OH), glycerol (CH 2 OH-CHOH-CH 2 OH) and acetone (CH 3 -CO-CH 3 ).
  • the process of the present invention has been found to be particularly well adapted to deposit zinc coatings with an aluminium content of at least 0 4 wt%, especially zinc coatings with an Al content of at least 1 %, such as Supergalva (3-7 % Al, 0-3 % Mg, 0-0.1 % Na, rest Zn),
  • Galfan (5% Al, 0 03-0.10% Mischmetall, rest Zn) and Galvalume (55 % Al, 1.6 % Si, rest Zn) The deposition of such coating has always formed a problem, for which up to now no satisfactory solution was available.
  • the process of the invention can be performed batchwise on individual steel articles or continuously on articles such as steel wire or sheet.
  • a steel test piece of 100 x 100 x 4 mm is subjected to the following operations.
  • ® H 2 S0 4 , CUPROBOND 15 being a product that consists essentially of CuS0 4 7H 2 0 and that is manufactured and commercialized by CHEMETALL GmbH, Reuterweg 14, D-6000
  • test piece is covered by a smooth and well adhering Zn-Al coating.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemically Coating (AREA)
  • Coating With Molten Metal (AREA)

Abstract

L'article à galvaniser est revêtu d'une mince couche métallique, par exemple, de cuivre, dans un milieu aqueux, avant d'être rincé avec de l'eau et ensuite avec un liquide organique miscible à l'eau, puis plongé dans un bain de zinc. Ce procédé est particulièrement utile pour déposer des revêtements de Zn-Al.
PCT/EP1997/001174 1996-03-20 1997-03-07 Procede de galvanisation a chaud sans flux Ceased WO1997035041A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU20965/97A AU2096597A (en) 1996-03-20 1997-03-07 A fluxless hot dip galvanizing process

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP96200776 1996-03-20
EP96200776.1 1996-03-20

Publications (1)

Publication Number Publication Date
WO1997035041A1 true WO1997035041A1 (fr) 1997-09-25

Family

ID=8223801

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/001174 Ceased WO1997035041A1 (fr) 1996-03-20 1997-03-07 Procede de galvanisation a chaud sans flux

Country Status (4)

Country Link
AU (1) AU2096597A (fr)
ID (1) ID16367A (fr)
WO (1) WO1997035041A1 (fr)
ZA (1) ZA972338B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7811389B2 (en) 2005-12-20 2010-10-12 Teck Metals Ltd. Flux and process for hot dip galvanization

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE920419C (de) * 1950-12-12 1954-11-22 Wacker Chemie Gmbh Verfahren zum Trocknen von wasserfeuchten Gegenstaenden aus starrem Material
GB995386A (en) * 1962-06-20 1965-06-16 Budavox Budapesti Hiradastechn Pre-tinning of articles consisting of or coated with palladium
DE1297950B (de) * 1965-09-22 1969-06-19 Siemens Ag Verfahren zum Verzinnen von Kupferdraehten
US3708406A (en) * 1970-10-06 1973-01-02 Oakite Prod Inc Tinning high carbon ferrous metals coated with iron using alkaline plating baths with chelating agents
JPS5792169A (en) * 1980-11-27 1982-06-08 Nippon Parkerizing Co Ltd Hot dipping method
DE3639556A1 (de) * 1986-11-20 1988-06-01 Siegener Verzinkerei Gmbh Verfahren zum feuerverzinken von metallgegenstaenden, insbesondere zum feuerverzinken nach dem trockenverfahren
JPH0372060A (ja) * 1989-08-11 1991-03-27 Ndc Co Ltd 厚目付けＰｂ基合金メッキ鋼板ならびにその製造法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE920419C (de) * 1950-12-12 1954-11-22 Wacker Chemie Gmbh Verfahren zum Trocknen von wasserfeuchten Gegenstaenden aus starrem Material
GB995386A (en) * 1962-06-20 1965-06-16 Budavox Budapesti Hiradastechn Pre-tinning of articles consisting of or coated with palladium
DE1297950B (de) * 1965-09-22 1969-06-19 Siemens Ag Verfahren zum Verzinnen von Kupferdraehten
US3708406A (en) * 1970-10-06 1973-01-02 Oakite Prod Inc Tinning high carbon ferrous metals coated with iron using alkaline plating baths with chelating agents
JPS5792169A (en) * 1980-11-27 1982-06-08 Nippon Parkerizing Co Ltd Hot dipping method
DE3639556A1 (de) * 1986-11-20 1988-06-01 Siegener Verzinkerei Gmbh Verfahren zum feuerverzinken von metallgegenstaenden, insbesondere zum feuerverzinken nach dem trockenverfahren
JPH0372060A (ja) * 1989-08-11 1991-03-27 Ndc Co Ltd 厚目付けＰｂ基合金メッキ鋼板ならびにその製造法

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 15, no. 231 (C - 0840) 12 June 1991 (1991-06-12) *
PATENT ABSTRACTS OF JAPAN vol. 6, no. 177 (C - 124) 11 September 1982 (1982-09-11) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7811389B2 (en) 2005-12-20 2010-10-12 Teck Metals Ltd. Flux and process for hot dip galvanization

Also Published As

Publication number Publication date
ID16367A (id) 1997-09-25
AU2096597A (en) 1997-10-10
ZA972338B (en) 1997-09-17

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