EP1070552B1 - Procédé pour revêtir des supports en fer ou en acier - Google Patents

Procédé pour revêtir des supports en fer ou en acier Download PDF

Info

Publication number
EP1070552B1
EP1070552B1 EP00114504A EP00114504A EP1070552B1 EP 1070552 B1 EP1070552 B1 EP 1070552B1 EP 00114504 A EP00114504 A EP 00114504A EP 00114504 A EP00114504 A EP 00114504A EP 1070552 B1 EP1070552 B1 EP 1070552B1
Authority
EP
European Patent Office
Prior art keywords
powder
process according
coat
coating
fix
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
EP00114504A
Other languages
German (de)
English (en)
Other versions
EP1070552A1 (fr
Inventor
Stefan Weissenmayer
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.)
Mueller Dieter
Original Assignee
Mueller Dieter
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 Mueller Dieter filed Critical Mueller Dieter
Publication of EP1070552A1 publication Critical patent/EP1070552A1/fr
Application granted granted Critical
Publication of EP1070552B1 publication Critical patent/EP1070552B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/56—Three layers or more
    • B05D7/58—No clear coat specified
    • B05D7/586—No clear coat specified each layer being cured, at least partially, separately
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies

Definitions

  • the invention relates to a method for coating the surfaces of Workpieces made of iron and steel and using such a method coated objects.
  • a layer of a highly weather-resistant polyester or Polyurethane powder applied As a single layer or in the case of a multilayer structure as a top layer preferably a layer of a highly weather-resistant polyester or Polyurethane powder applied. Powder coatings on this basis are in almost lightfast and UV stabilized version available and lend the coated article has a high weather resistance.
  • EP-A-0 030 762 describes the application of a base layer made of zinc / epoxy resin and a cover layer made of synthetic resin to a surface to be protected.
  • the object of the invention was therefore to provide a coating system for iron and To create steel parts that are primarily high Corrosion protection requirements of German railways and road construction are not is only fair at the moment but also withstands long-term.
  • the goal was, among other things, to obtain corrosion protection, that of galvanizing at least equals without their disadvantages such as outgassing, zinc flowers, to have to accept rough surfaces etc.
  • the aim was furthermore a visually appealing and decorative surface that the designers and enables architects to create elegant steel structures in one to design an appealing shade.
  • the surface should be in its Structure to be improved so far that they have a powder coating Aluminum equals.
  • polyester or polyurethane powder is additionally used an intermediate layer of pure between these two layers Epoxy resin powder provided.
  • An epoxy powder is used for this intermediate layer, which forms a Layer with high pore tightness leads.
  • the Pore tightness of this pure epoxy resin layer causes moisture and liquid or liquid pollutants are very difficult to Diffuse underground and can damage the steel, which by the Mixing layer of zinc powder and epoxy resin not to the same extent is guaranteed. This is particularly important in the area of elevated Pollution such as road salt attacks and sea air influences.
  • the basic property of the epoxy resin ensures a extraordinarily high chemical resistance and gives an additional Guarantee that aggressive media will not penetrate the coating and Destroy underground.
  • the pure epoxy resin layer also forms a microscopically rough and matt Surface that is a very good, adhesive surface for the subsequent Represents top layer of polyester or polyurethane powder.
  • the powder is preferably applied to the workpiece conventional way by spraying the powder in the electrostatic field instead of.
  • the production of the surface, which is as clean as possible, as a substrate is usually done by blasting, especially sandblasting. in this connection a surface roughness of 40-80 ⁇ m should be achieved. A such roughening improves the adhesion of zinc powder and Epoxy resin base layer. Roughness depths of more than 80 ⁇ m are too avoid, because otherwise the metal tips, which result from the sandblasting, can no longer be covered by the zinc powder.
  • Sandblasting should be carried out according to SA 3, DIN 55928, Part 4, rust removal sharp-edged grain made to the surface of oxides, scale, rust etc. to free. Applying the base layer of zinc powder and Epoxy resin should be applied immediately after sandblasting so that prepared surface area not disadvantageous again in the meantime Undergoes changes.
  • Epoxy resin is used, which has a relatively high zinc content, namely one Contains 60-85 wt .-%. This high proportion is appropriate to the cathodic protection achieved by hot-dip galvanizing if possible come close. As with a conventional galvanizing, this Layer of steel cathodically protected in the event of surface damage. The good adhesion of the epoxy resin to the steel prevents this Infiltration of the coating by foreign substances. The microscopic rough and matte surface of the powder provides an excellent primer for the subsequent intermediate layer made of pure epoxy powder.
  • the thickness of the thermally treated base layer should be in the range of 30-200 ⁇ m. This layer thickness specification also applies in the same way to the intermediate layer made of pure epoxy powder.
  • the thickness of the highly weather-resistant top layer made of polyester or polyurethane powder is preferably chosen somewhat higher than that of the basic and Interlayer. It is preferably between 45 and 300 ⁇ m after thermal treatment.
  • the top layer is intended to cover the entire system Protect weather influences. The top layer can, depending on requirements, with different optical effects are generated. Almost every color and any surface character is possible here.
  • the thermal treatment of the workpiece to fix the individual Powder layers take place between about 150 ° C and 250 ° C.
  • the thermal treatment is expediently in a hot air chamber performed.
  • the workpiece must always be the specified one Reach temperatures.
  • a pure surface heating of the applied Powder layer may not be enough to fix it properly.
  • the duration of each thermal treatment can be up to 60 minutes.
  • the finished coating preferably has an overall thickness in the range of 100-700 ⁇ m.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Laminated Bodies (AREA)
  • Paints Or Removers (AREA)
  • Compounds Of Iron (AREA)

Claims (10)

  1. Procédé pour le revêtement de surfaces de pièces en fer ou en acier présentant les étapes de procédé suivantes :
    a) préparation d'une surface métalliquement la plus pure possible,
    b) application d'une couche de base constituée d'un mélange d'une poudre de zinc et d'une poudre époxy thermiquement durcissable et traitement thermique de la pièce pour la fixation de la couche de base,
    c) application d'une couche intermédiaire constituée d'une poudre époxy thermiquement durcissable et traitement thermique de la pièce pour la fixation de la couche intermédiaire ainsi qu'
    d) application d'une couche de recouvrement constituée d'une poudre en matériau de revêtement thermiquement durcissable, en particulier à base de polyester ou de polyuréthane et traitement thermique de la pièce pour la fixation de la couche de recouvrement.
  2. Procédé selon la revendication 1, caractérisé en ce que les pièces sont revêtues électrostatiquement avec chaque poudre.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la surface métalliquement la plus pure possible est réalisée par sablage.
  4. Procédé selon la revendication 3, caractérisé en ce que le sablage est réalisé à une profondeur de rugosité de 40 à 80 µm.
  5. Procédé selon la revendication 3 ou 4, caractérisé en ce que le sablage est réalisé selon la norme SA 3, DIN 55928, 4ème partie, dérouillage, avec des grains à arête vive.
  6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'on utilise pour la couche de base un mélange de poudre de zinc et de poudre de résine époxyde, qui contient 60 à 85% en poids de poudre de zinc.
  7. Procédé selon l'une quelconque des revendications 1 à 6, caractérisé en ce que la couche de base est produite avec une épaisseur finale de 30 à 200 µm.
  8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la couche intermédiaire en résine époxyde est produite avec une épaisseur finale de 30 à 200 µm.
  9. Procédé selon l'une quelconque des revendications 1 à 8, caractérisé en ce que la couche de recouvrement est produite avec une épaisseur finale de 45 à 300 µm.
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que les traitements thermiques de la pièce pour fixer les différentes couches sont réalisés jusqu'à 60 minutes à 150 jusqu'à 250°C.
EP00114504A 1999-07-17 2000-07-06 Procédé pour revêtir des supports en fer ou en acier Expired - Lifetime EP1070552B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19933698 1999-07-17
DE19933698A DE19933698A1 (de) 1999-07-17 1999-07-17 Verfahren zum Beschichten von Eisen- und Stahluntergründen

Publications (2)

Publication Number Publication Date
EP1070552A1 EP1070552A1 (fr) 2001-01-24
EP1070552B1 true EP1070552B1 (fr) 2002-10-16

Family

ID=7915223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00114504A Expired - Lifetime EP1070552B1 (fr) 1999-07-17 2000-07-06 Procédé pour revêtir des supports en fer ou en acier

Country Status (5)

Country Link
EP (1) EP1070552B1 (fr)
AT (1) ATE226116T1 (fr)
DE (2) DE19933698A1 (fr)
ES (1) ES2185532T3 (fr)
PT (1) PT1070552E (fr)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2353701C3 (de) * 1973-10-26 1982-01-07 Inmont GmbH, 5300 Bonn Zinkstaubprimersystem für verformbares Stahlblech
NL171333C (nl) * 1975-10-14 1983-03-16 Akzo Nv Werkwijze voor het onder water bekleden van metaaloppervlakken.
FR2452327A1 (fr) * 1979-03-29 1980-10-24 Cauwenberghe Helic Van Procede d'application d'un revetement anticorrosif sur des objets metalliques, notamment sur des bouteilles de gaz liquefie
NL7909016A (nl) * 1979-12-14 1981-07-16 Akzo Nv Werkwijze voor het aanbrengen van een corrosiewerend 2-lagen systeem op staal.
DE3531370A1 (de) * 1985-09-03 1987-03-05 Iris Lacke Baumann Gmbh Lacksystem fuer eine korrosions- und schlagfeste lackierung

Also Published As

Publication number Publication date
ES2185532T3 (es) 2003-05-01
EP1070552A1 (fr) 2001-01-24
DE50000635D1 (de) 2002-11-21
PT1070552E (pt) 2003-03-31
DE19933698A1 (de) 2001-01-18
ATE226116T1 (de) 2002-11-15

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