EP0674951A1 - Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained - Google Patents

Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained Download PDF

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Publication number
EP0674951A1
EP0674951A1 EP94400639A EP94400639A EP0674951A1 EP 0674951 A1 EP0674951 A1 EP 0674951A1 EP 94400639 A EP94400639 A EP 94400639A EP 94400639 A EP94400639 A EP 94400639A EP 0674951 A1 EP0674951 A1 EP 0674951A1
Authority
EP
European Patent Office
Prior art keywords
coating
varnish
metallic
parts
acrylic varnish
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
EP94400639A
Other languages
German (de)
French (fr)
Other versions
EP0674951B1 (en
Inventor
Alice Joseph
Alain Le Marchand
Pierre-Noel Rollin
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.)
Ateliers Reunis Caddie SA
Original Assignee
Ateliers Reunis Caddie 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
Priority to FR9211868A priority Critical patent/FR2696371B1/en
Priority to US08/200,951 priority patent/US6242105B1/en
Application filed by Ateliers Reunis Caddie SA filed Critical Ateliers Reunis Caddie SA
Priority to ES94400639T priority patent/ES2122183T3/en
Priority to DE69412233T priority patent/DE69412233T2/en
Priority to AT94400639T priority patent/ATE169249T1/en
Priority to EP94400639A priority patent/EP0674951B1/en
Priority to DK94400639T priority patent/DK0674951T3/en
Priority to ZA942181A priority patent/ZA942181B/en
Priority to IL109176A priority patent/IL109176A/en
Priority to AU59311/94A priority patent/AU679718B2/en
Priority to CZ94801A priority patent/CZ285173B6/en
Priority to HU9400978A priority patent/HU213992B/en
Priority to JP6092964A priority patent/JPH07275797A/en
Priority to CN94104602A priority patent/CN1087664C/en
Publication of EP0674951A1 publication Critical patent/EP0674951A1/en
Application granted granted Critical
Publication of EP0674951B1 publication Critical patent/EP0674951B1/en
Priority to HK98114811A priority patent/HK1013406A1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B05D7/52—Two layers
    • B05D7/54—No clear coat specified
    • B05D7/546—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
    • B05D7/16—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 using synthetic lacquers or varnishes
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • 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
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • 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
    • B05D2502/00—Acrylic polymers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12375—All metal or with adjacent metals having member which crosses the plane of another member [e.g., T or X cross section, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12542—More than one such component
    • Y10T428/12549—Adjacent to each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12535—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.] with additional, spatially distinct nonmetal component
    • Y10T428/12556—Organic component
    • Y10T428/12569—Synthetic resin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/12—All metal or with adjacent metals
    • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
    • Y10T428/12771—Transition metal-base component
    • Y10T428/12785—Group IIB metal-base component
    • Y10T428/12792—Zn-base component
    • Y10T428/12799—Next to Fe-base component [e.g., galvanized]

Definitions

  • the present invention relates to methods of covering metal parts or structures by means of a coating consisting of a thermosetting powder, based on polyester or epoxy resin or a mixture of the two, as well as the metal products thus coated.
  • the purpose of adding such a coating is in particular to improve the aesthetic appearance of the corresponding parts and to ensure their protection against the risks of corrosion.
  • the application of the coating thus provided is carried out by spraying the thermosetting powder, by means of an electrostatic gun, on the parts to be covered, then passage of the latter in an oven heated to a temperature of the order of 220 ° C to ensure the polymerization of the coating.
  • the coating thus applied has the disadvantage of having insufficient resistance to impact as well as to abrasion. This is therefore a particularly annoying drawback when such a coating is provided on objects essentially consisting of assembled wires, liable to be subjected to impacts or friction as is the case, for example, for supermarket trolleys , transport baskets, etc ... Furthermore, this type of coating has insufficient resistance against the risk of corrosion under the effect of chemicals or even simply atmospheric agents.
  • the subject of the present invention is a method of covering parts or structures. essentially made of assembled wires, which is designed to significantly improve the adhesion conditions of the coating of the type in question and consequently its impact resistance and its abrasion resistance.
  • the invention also relates to a metallic product, in particular assembled by welding of metallic wires, coated by a coating process.
  • this sub-layer has the advantage, not only of ensuring a very strong bond of the external coating with the corresponding metal part, but also of improving in considerable proportions the behavior of the external coating with respect to impacts and risk of abrasion.
  • This is due in particular to the fact that this intermediate layer which is significantly less hard than the galvanized metal alone, serves as a sort of damping buffer between the external coating and the supporting metal part.
  • the external coating can more easily resist the risks of cracking, breakage or peeling existing in the case of a direct application of such a coating to a metal part.
  • composition of the acrylic varnish used as an intermediate layer may for example be the following composition: BUTANOL 13.4% XYLENE 35%
  • the intermediate layer thus formed can play its role effectively, its thickness should be between 5 and 25 microns, if the thickness of the external coating is itself of the order of 50 to 200 microns.
  • the intermediate layer should have a lower hardness than that of the galvanized metal so that it is a good sufficient bonding agent to avoid the risk of cracking, breaking or peeling of the coating, when the parts are subject to impact or abrasion.
  • the external coating can be produced by means of thermosetting powders such as the powder sold under the brand "POLYDROX” by the lich Industrielle de Voisins (69). But this is only an indicative example because it is possible to use numerous other types of composition for thermosetting coating powders, based on polyester resin or epoxy resin, or a mixture of the two.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Paints Or Removers (AREA)
  • Laminated Bodies (AREA)
  • Chemically Coating (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Macromonomer-Based Addition Polymer (AREA)

Abstract

In coating metal units or structures with a heat-hardening powder based on a polyester resin and/or an epoxy resin, which is sprayed on by means of an electrostatic spray gun and then polymerised in an oven, the pieces to be coated are pre-treated by: (a) an electrolytic zinc plating; and (b) application of a coat of varnish, followed by drying, baking or polymerisation of the varnish. This coating acts as a bonding underlayer between the metal and the polyester and/or epoxy resin outer coating. Pref. the varnish is acrylic and is polymerised in an oven. The thickness of the varnish layer is 2-30 (5-15) microns. The varnish is applied by dipping or spraying.

Description

La présente invention concerne les procédés de recouvrement de pièces ou de structures métalliques au moyen d'un revêtement constitué par une poudre thermodurcissable, à base de résine polyester ou époxy ou d'un mélange des deux, ainsi que les produits métalliques ainsi revêtus.The present invention relates to methods of covering metal parts or structures by means of a coating consisting of a thermosetting powder, based on polyester or epoxy resin or a mixture of the two, as well as the metal products thus coated.

L'adjonction d'un tel revêtement a notamment pour but d'améliorer l'aspect esthétique des pièces correspondantes et d'assurer leur protection à l'encontre des risques de corrosion. Dans ce double but, il est courant de prévoir un tel revêtement sur de nombreuses pièces ou structures métalliques, par exemple sur des chariots de supermarchés, des corbeilles de transport, des éléments de rayonnages... L'application du revêtement ainsi prévu est réalisé par projection de la poudre thermodurcissable, au moyen d'un pistolet électrostatique, sur les pièces à recouvrir, puis passage de ces dernières dans un four chauffé à une température de l'ordre de 220°C pour assurer la polymérisation du revêtement.The purpose of adding such a coating is in particular to improve the aesthetic appearance of the corresponding parts and to ensure their protection against the risks of corrosion. For this double purpose, it is common to provide such a coating on many metal parts or structures, for example on supermarket trolleys, transport baskets, shelving elements ... The application of the coating thus provided is carried out by spraying the thermosetting powder, by means of an electrostatic gun, on the parts to be covered, then passage of the latter in an oven heated to a temperature of the order of 220 ° C to ensure the polymerization of the coating.

Cependant, le revêtement ainsi appliqué à l'inconvénient de présenter une résistance insuffisante à l'encontre des chocs ainsi qu'à l'abrasion. Il s'agit donc là d'un inconvénient particulièrement gênant lorsqu'un tel revêtement est prévu sur des objets essentiellement constitués de fils assemblés, susceptibles de subir des chocs ou des frottements comme cela est le cas, par exemple, pour des chariots de supermarchés, des corbeilles de transport, etc...Par ailleurs, ce type de revêtement présente une résistance insuffisante à l'encontre des risques de corrosion sous l'effet de produits chimiques ou même simplement des agents atmosphériques.However, the coating thus applied has the disadvantage of having insufficient resistance to impact as well as to abrasion. This is therefore a particularly annoying drawback when such a coating is provided on objects essentially consisting of assembled wires, liable to be subjected to impacts or friction as is the case, for example, for supermarket trolleys , transport baskets, etc ... Furthermore, this type of coating has insufficient resistance against the risk of corrosion under the effect of chemicals or even simply atmospheric agents.

C'est pourquoi, la présente invention a pour objet un procédé de recouvrement de pièces ou de structures métalliques essentiellement constituées de fils assemblés, qui est conçu de façon à améliorer sensiblement les conditions d'adhérence du revêtement du type en cause et par conséquent sa tenue aux chocs et sa résistance à l'abrasion.This is why, the subject of the present invention is a method of covering parts or structures. essentially made of assembled wires, which is designed to significantly improve the adhesion conditions of the coating of the type in question and consequently its impact resistance and its abrasion resistance.

A cet effet, ce procédé est caractérisé en ce qu'avant la projection de la poudre thermodurcissable destinée à constituer le revêtement externe, on effectue successivement les deux opérations suivantes sur les pièces à recouvrir :

  • a.- traitement initial de zingage par procédé électrolytique,
  • b.- application d'une couche d'un vernis puis après séchage ou cuisson ou polymérisation de ce revêtement de vernis, ce revêtement intermédiaire étant apte à servir de sous-couche de liaison entre le métal et le revêtement externe à base de résine polyester, de résine époxy, ou d'un mélange des deux.
To this end, this process is characterized in that before the projection of the thermosetting powder intended to constitute the external coating, the following two operations are carried out successively on the parts to be covered:
  • a.- initial treatment of zinc plating by electrolytic process,
  • b.- application of a layer of a varnish then after drying or curing or polymerization of this coating of varnish, this intermediate coating being able to serve as a bonding sublayer between the metal and the external coating based on polyester resin , epoxy resin, or a mixture of the two.

Selon d'autres caractéristiques de l'invention :

  • l'épaisseur du revêtement est comprise entre 2 et 30 micromètres et de préférence entre 5 et 25 micromètres,
  • l'application de la couche d'un vernis acrylique est effectuée au trempé, par trempage des pièces dans un bain dudit vernis,
  • l'application de la couche d'un vernis acrylique est effectuée par pulvérisation.
  • la polymérisation du vernis acrylique est faite dans un four.
According to other characteristics of the invention:
  • the thickness of the coating is between 2 and 30 micrometers and preferably between 5 and 25 micrometers,
  • the application of the layer of an acrylic varnish is carried out by dipping, by dipping the parts in a bath of said varnish,
  • the application of the layer of an acrylic varnish is carried out by spraying.
  • the acrylic varnish is polymerized in an oven.

L'invention a également pour objet un produit métallique, notamment assemblé par soudage de fils métalliques, revêtu par un procédé de revêtement.The invention also relates to a metallic product, in particular assembled by welding of metallic wires, coated by a coating process.

Cependant, cette sous-couche a pour avantage, non seulement d'assurer une liaison très forte du revêtement externe avec la pièce métallique correspondante, mais également d'améliorer dans des proportions considérables la tenue du revêtement externe à l'égard des chocs et des risques d'abrasion. Ceci est dû notamment au fait que cette couche intermédiaire qui est nettement moins dure que le métal zingué seul, sert en quelque sorte de tampon amortisseur entre le revêtement externe et la pièce métallique porteuse. Ainsi, en cas de choc, le revêtement externe peut plus facilement résister aux risques de fendillage, de cassure ou de pelage existant dans le cas d'une application directe d'un tel revêtement sur une pièce métallique.However, this sub-layer has the advantage, not only of ensuring a very strong bond of the external coating with the corresponding metal part, but also of improving in considerable proportions the behavior of the external coating with respect to impacts and risk of abrasion. This is due in particular to the fact that this intermediate layer which is significantly less hard than the galvanized metal alone, serves as a sort of damping buffer between the external coating and the supporting metal part. Thus, in the event of an impact, the external coating can more easily resist the risks of cracking, breakage or peeling existing in the case of a direct application of such a coating to a metal part.

D'une façon générale, les avantages des pièces comportant un revêtement réalisé par le procédé selon l'invention portent essentiellement sur les trois points suivants :

  • a.- excellente tenue du revêtement externe à l'égard des chocs et de l'abrasion, pour les raisons indiquées précédemment.
  • b.- très forte liaison du revêtement externe avec les pièces revêtues et ce, du fait de la qualité de la liaison de ce revêtement avec le vernis acrylique intermédiaire qui présente lui-même une très forte liaison avec les pièces métalliques préalablement zinguées.
  • c.- très bonne tenue de l'ensemble à l'encontre des risques de corrosion résultant de produits chimiques ainsi que de l'action des agents atmosphériques.
In general, the advantages of parts comprising a coating produced by the method according to the invention relate essentially to the following three points:
  • a.- excellent resistance of the external coating with regard to impact and abrasion, for the reasons indicated above.
  • b.- very strong bond of the external coating with the coated parts, due to the quality of the bond of this coating with the intermediate acrylic varnish which itself has a very strong bond with the previously galvanized metal parts.
  • c.- very good performance of the assembly against the risks of corrosion resulting from chemicals as well as the action of atmospheric agents.

Ces avantages ont du reste été mis en évidence par des essais comparatifs qui ont été effectués avec trois lots distincts des pièces métalliques comportant respectivement : l'application directe d'un revêtement externe du type en cause, l'application de ce revêtement sur des pièces ayant seulement reçu un traitement préalable de zingage et l'application d'un tel revêtement sur des pièces ayant préalablement subi à la fois un traitement de zingage et leur revêtement au moyen d'un vernis acrylique. En effet, ces essais comparatifs ont démontré que les pièces de ce dernier lot présentent des avantages très nets sur ces différents points par rapport aux pièces des deux autres lots.These advantages have moreover been demonstrated by comparative tests which have been carried out with three separate batches of metal parts comprising respectively: the direct application of an external coating of the type in question, the application of this coating on parts having only received a prior zinc treatment and the application of such a coating on parts having previously undergone both a zinc treatment and their coating by means of an acrylic varnish. Indeed, these comparative tests have shown that the pieces of this last batch have very clear advantages on these different points compared to the pieces of the other two lots.

Pour la mise en oeuvre du procédé selon l'invention, on effectue successivement les opérations suivantes :

  • 1.- les pièces à recouvrir sont tout d'abord revêtues d'un zingage par procédé électrolytique et ce, après avoir subi les traitements préalables nécessaires tels que décapage, dégraissage, etc...
  • 2. - les pièces zinguées sont pourvues d'un revêtement en vernis acrylique, et ce par trempage dans un bain d'un tel vernis. Puis ces pièces sont transférées dans un four chauffé à une température de l'ordre de 220°C afin d'assurer la polymérisation du vernis acrylique.
  • 3.- les pièces à recouvrir reçoivent ensuite leur revêtement externe par projection de celui-ci au moyen d'un pistolet électrostatique. Ce revêtement externe consiste en une poudre thermodurcissable à base de résine polyester ou résine époxy ou d'un mélange des deux. Enfin, les pièces sont à nouveau transférées dans un four chauffé à une température de l'ordre de 220°C pour assurer la polymérisation de ce revêtement externe.
For the implementation of the method according to the invention, the following operations are carried out successively:
  • 1.- the parts to be covered are first coated with zinc plating by electrolytic process and this, after having undergone the necessary preliminary treatments such as pickling, degreasing, etc ...
  • 2. - the galvanized parts are provided with a coating of acrylic varnish, and this by soaking in a bath of such a varnish. Then these parts are transferred to an oven heated to a temperature of about 220 ° C to ensure the polymerization of the acrylic varnish.
  • 3.- the parts to be covered then receive their external coating by projection of it by means of an electrostatic gun. This external coating consists of a thermosetting powder based on polyester resin or epoxy resin or a mixture of the two. Finally, the parts are again transferred to an oven heated to a temperature of the order of 220 ° C. to ensure the polymerization of this external coating.

La composition du vernis acrylique utilisé comme couche intermédiaire peut être par exemple la composition suivante : BUTANOL 13,4% XYLENE 35% The composition of the acrylic varnish used as an intermediate layer may for example be the following composition: BUTANOL 13.4% XYLENE 35%

De préférence pour que la couche intermédiaire ainsi constituée puisse jouer efficacement son rôle, il convient que son épaisseur soit comprise entre 5 et 25 microns, si l'épaisseur du revêtement externe est lui-même de l'ordre de 50 à 200 microns.Preferably so that the intermediate layer thus formed can play its role effectively, its thickness should be between 5 and 25 microns, if the thickness of the external coating is itself of the order of 50 to 200 microns.

En tout état de cause, il convient que la couche intermédiaire ait une dureté inférieure à celle du métal zingué afin qu'elle soit un bon agent de liaison suffisante pour éviter des risques de fendillage, de cassure ou de pelage du revêtement, lorsque les pièces correspondantes sont soumises à des chocs ou à une abrasion.In any case, the intermediate layer should have a lower hardness than that of the galvanized metal so that it is a good sufficient bonding agent to avoid the risk of cracking, breaking or peeling of the coating, when the parts are subject to impact or abrasion.

Le revêtement externe peut être réalisé au moyen de poudres thermodurcissables telles que la poudre commercialisée sous la marque "POLYDROX" par la Société Industrielle de Voisins (69). Mais il ne s'agit là que d'un exemple indicatif car il est possible d'utiliser de nombreux autres types de composition de poudres thermodurcissantes de revêtement, à base de résine polyester ou de résine époxy, ou d'un mélange des deux.The external coating can be produced by means of thermosetting powders such as the powder sold under the brand "POLYDROX" by the Société Industrielle de Voisins (69). But this is only an indicative example because it is possible to use numerous other types of composition for thermosetting coating powders, based on polyester resin or epoxy resin, or a mixture of the two.

Claims (6)

Procédé de revêtement de pièces métalliques, ou de structures métalliques essentiellement constituées de fils assemblés, où l'on applique à l'aide d'un pistolet électrostatique, une poudre thermodurcissable, à base d'une résine polyester, d'une résine époxy ou d'un mélange des deux, que l'on polymérise ensuite dans un four, caractérisé en ce qu'avant la projection de cette poudre, on effectue successivement les deux opérations suivantes : a.- effectuer un traitement initial de zingage de la pièce ou structure métallique par un procédé électrolytique, b.- appliquer une couche d'un vernis acrylique, puis effectuer un séchage, une cuisson ou une polymérisation de ce revêtement de vernis, ce revêtement intermédiaire étant apte à servir de sous-couche de liaison entre le métal et le revêtement externe à base de résine polyester, de résine époxy, ou d'un mélange des deux. Method for coating metallic parts, or metallic structures essentially made up of assembled wires, where a thermosetting powder is applied using an electrostatic gun, based on a polyester resin, an epoxy resin or of a mixture of the two, which is then polymerized in an oven, characterized in that before the projection of this powder, the following two operations are carried out successively: a.- carry out an initial treatment of zinc coating of the metal part or structure by an electrolytic process, b.- apply a layer of an acrylic varnish, then carry out a drying, curing or polymerization of this varnish coating, this intermediate coating being able to serve as a bonding undercoat between the metal and the external coating based polyester resin, epoxy resin, or a mixture of the two. Procédé de revêtement caractérisé en ce que le vernis acrylique est polymérisé dans un four.Coating process characterized in that the acrylic varnish is polymerized in an oven. Procédé de revêtement selon la revendication 1 ou 2, caractérisé en ce que l'épaisseur du revêtement intermédiaire en vernis acrylique est comprise entre 2 et 30 micromètres, et de préférence entre 5 et 25 micromètres.Coating method according to claim 1 or 2, characterized in that the thickness of the intermediate coating in acrylic varnish is between 2 and 30 micrometers, and preferably between 5 and 25 micrometers. Procédé de revêtement selon l'une des revendications 1 à 3, caractérisé en ce que l'application de la couche de vernis acrylique est effectuée au trempé, par trempage des pièces dans un bain dudit vernis.Coating method according to one of claims 1 to 3, characterized in that the application of the layer of acrylic varnish is carried out by dipping, by dipping the parts in a bath of said varnish. Procédé de revêtement selon l'une des revendications 1 à 3, caractérisé en ce que l'application de la couche de vernis acrylique est effectuée par pulvérisation.Coating method according to one of claims 1 to 3, characterized in that the application of the layer of acrylic varnish is carried out by spraying. Produit métallique, notamment assemblé par soudage de fils métalliques, revêtu par un procédé selon l'une quelconque des revendications 1 à 5.Metallic product, in particular assembled by welding of metallic wires, coated by a process according to any one of Claims 1 to 5.
EP94400639A 1992-10-07 1994-03-25 Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained Expired - Lifetime EP0674951B1 (en)

Priority Applications (15)

Application Number Priority Date Filing Date Title
FR9211868A FR2696371B1 (en) 1992-10-07 1992-10-07 Process for coating metal parts or structures using a thermosetting powder, based on polyester or epoxy resin or a mixture of the two and metal product thus coated.
US08/200,951 US6242105B1 (en) 1992-10-07 1994-02-23 Process for coating metallic parts and metallic product thus coated
ES94400639T ES2122183T3 (en) 1992-10-07 1994-03-25 PROCEDURE FOR COATING PARTS OR METALLIC STRUCTURES WITH A THERMO-CURE POWDER AND METAL PRODUCT SO OBTAINED.
DE69412233T DE69412233T2 (en) 1992-10-07 1994-03-25 Process for coating on metallic materials or structures, a thermosetting powder and objects manufactured in this way
AT94400639T ATE169249T1 (en) 1992-10-07 1994-03-25 METHOD FOR COATING ON METAL MATERIALS OR STRUCTURES, A HOME SETTING POWDER AND ITEMS SO PRODUCED
EP94400639A EP0674951B1 (en) 1992-10-07 1994-03-25 Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained
DK94400639T DK0674951T3 (en) 1992-10-07 1994-03-25 Process for coating metallic articles or structures with a thermosetting powder, and thus obtained metal
ZA942181A ZA942181B (en) 1992-10-07 1994-03-28 Process for coating metallic parts and metallic product thus coasted
IL109176A IL109176A (en) 1992-10-07 1994-03-30 Process for coating metallic parts and metallic product thus coated
AU59311/94A AU679718B2 (en) 1992-10-07 1994-04-06 Process for coating metallic parts and metallic product thuscoated
CZ94801A CZ285173B6 (en) 1992-10-07 1994-04-06 Process of coating metallic parts and a metallic product coated in such a manner
HU9400978A HU213992B (en) 1992-10-07 1994-04-06 Process for coating metallic parts and metallic product thus coated
JP6092964A JPH07275797A (en) 1992-10-07 1994-04-06 Method of coating metal part and metal article coated by said method
CN94104602A CN1087664C (en) 1992-10-07 1994-04-07 Process for coating metallic parts and metallic product thus coated
HK98114811A HK1013406A1 (en) 1992-10-07 1998-12-22 Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained

Applications Claiming Priority (9)

Application Number Priority Date Filing Date Title
FR9211868A FR2696371B1 (en) 1992-10-07 1992-10-07 Process for coating metal parts or structures using a thermosetting powder, based on polyester or epoxy resin or a mixture of the two and metal product thus coated.
US08/200,951 US6242105B1 (en) 1992-10-07 1994-02-23 Process for coating metallic parts and metallic product thus coated
EP94400639A EP0674951B1 (en) 1992-10-07 1994-03-25 Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained
ZA942181A ZA942181B (en) 1992-10-07 1994-03-28 Process for coating metallic parts and metallic product thus coasted
IL109176A IL109176A (en) 1992-10-07 1994-03-30 Process for coating metallic parts and metallic product thus coated
CZ94801A CZ285173B6 (en) 1992-10-07 1994-04-06 Process of coating metallic parts and a metallic product coated in such a manner
AU59311/94A AU679718B2 (en) 1992-10-07 1994-04-06 Process for coating metallic parts and metallic product thuscoated
JP6092964A JPH07275797A (en) 1992-10-07 1994-04-06 Method of coating metal part and metal article coated by said method
CN94104602A CN1087664C (en) 1992-10-07 1994-04-07 Process for coating metallic parts and metallic product thus coated

Publications (2)

Publication Number Publication Date
EP0674951A1 true EP0674951A1 (en) 1995-10-04
EP0674951B1 EP0674951B1 (en) 1998-08-05

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EP94400639A Expired - Lifetime EP0674951B1 (en) 1992-10-07 1994-03-25 Process for coating metallic workpieces or structure with a thermosetting powder and metallic product thus obtained

Country Status (15)

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US (1) US6242105B1 (en)
EP (1) EP0674951B1 (en)
JP (1) JPH07275797A (en)
CN (1) CN1087664C (en)
AT (1) ATE169249T1 (en)
AU (1) AU679718B2 (en)
CZ (1) CZ285173B6 (en)
DE (1) DE69412233T2 (en)
DK (1) DK0674951T3 (en)
ES (1) ES2122183T3 (en)
FR (1) FR2696371B1 (en)
HK (1) HK1013406A1 (en)
HU (1) HU213992B (en)
IL (1) IL109176A (en)
ZA (1) ZA942181B (en)

Cited By (1)

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CN105080808A (en) * 2015-07-02 2015-11-25 柳州市亿瑞物资有限责任公司 Coating method for polyurethane paint

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FR2696371B1 (en) 1992-10-07 1994-10-28 Caddie Atel Reunis Process for coating metal parts or structures using a thermosetting powder, based on polyester or epoxy resin or a mixture of the two and metal product thus coated.
US6174426B1 (en) 1999-08-12 2001-01-16 Usx Corporation Tin-plated steel with adhesion promoter
JP2001300407A (en) * 2000-04-27 2001-10-30 Dainippon Toryo Co Ltd Method for coating wire material assembly
EP1294595B1 (en) * 2000-06-28 2006-08-23 N.V. Bekaert S.A. Reinforced wiper element
CN1321747C (en) * 2005-09-06 2007-06-20 贵州科盛彩色喷涂有限公司 Outdoor metal surface double coating antiseptic chromatic spray painting method
CN101108942B (en) * 2007-08-14 2011-02-09 上海造漆厂 Process for producing solvent resistant static electricity spraying propenoic acid stoving enamel
UA117592C2 (en) 2013-08-01 2018-08-27 Арселорміттал PAINTED GALVANIZED STEEL SHEET AND METHOD OF MANUFACTURING
CN110624787A (en) * 2019-09-11 2019-12-31 中山市天青色厨卫科技有限公司 Manufacturing process of environment-friendly anhydrous electroplating base material

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Also Published As

Publication number Publication date
HK1013406A1 (en) 1999-08-27
ZA942181B (en) 1995-01-16
DE69412233D1 (en) 1998-09-10
FR2696371A1 (en) 1994-04-08
EP0674951B1 (en) 1998-08-05
HU9400978D0 (en) 1994-06-28
DE69412233T2 (en) 1999-01-21
ATE169249T1 (en) 1998-08-15
CN1087664C (en) 2002-07-17
JPH07275797A (en) 1995-10-24
CZ80194A3 (en) 1996-01-17
AU5931194A (en) 1995-10-26
CN1110195A (en) 1995-10-18
HU213992B (en) 1997-11-28
ES2122183T3 (en) 1998-12-16
FR2696371B1 (en) 1994-10-28
IL109176A (en) 1998-06-15
DK0674951T3 (en) 1999-05-03
IL109176A0 (en) 1994-06-24
AU679718B2 (en) 1997-07-10
US6242105B1 (en) 2001-06-05
HUT70995A (en) 1995-11-28
CZ285173B6 (en) 1999-06-16

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