EP1531012B1 - Protection supplémentaire contre la corrosion pour des piéces de tôle métallique disposant déjà d'un revêtement organique - Google Patents

Protection supplémentaire contre la corrosion pour des piéces de tôle métallique disposant déjà d'un revêtement organique Download PDF

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Publication number
EP1531012B1
EP1531012B1 EP04022644A EP04022644A EP1531012B1 EP 1531012 B1 EP1531012 B1 EP 1531012B1 EP 04022644 A EP04022644 A EP 04022644A EP 04022644 A EP04022644 A EP 04022644A EP 1531012 B1 EP1531012 B1 EP 1531012B1
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EP
European Patent Office
Prior art keywords
organic polymers
component
galvanized steel
coating based
metal
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EP04022644A
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German (de)
English (en)
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EP1531012A3 (fr
EP1531012A2 (fr
Inventor
Heike Quellhorst
Patrick Droniou
Alina Monica Koch
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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Publication of EP1531012A3 publication Critical patent/EP1531012A3/fr
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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
    • B05D7/14—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
    • 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
    • B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
    • 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
    • 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
    • C23C22/34—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 containing fluorides or complex fluorides
    • 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
    • C23C22/82—After-treatment
    • C23C22/83—Chemical after-treatment
    • 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
    • B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding

Definitions

  • the invention relates to a corrosion protection method for use in the production of painted metallic components from organically pre-coated metal sheets.
  • a corrosion protection layer which also serves as a primer for the subsequent painting.
  • a permanent corrosion-protective coating can be produced consisting of a conversion layer and a coating layer after assembly of the metallic components.
  • a well-known example of this is the process sequence phosphating and painting, as is common, for example, in the automotive industry.
  • the actual phosphating is only one step in a treatment sequence, which generally includes, in addition to cleaning and rinsing stages, activation before phosphating, the actual phosphating and often post-passivation after phosphating. Thereafter, join several paint on.
  • the pre-treatment before painting therefore requires several treatment steps, which in turn make a correspondingly extensive and thus costly pretreatment plant required.
  • heavy metal-containing waste which must be disposed of costly.
  • conversion layer is understood to mean a layer on a metal surface which is formed by “conversion treatment” under the action of a “conversion solution” and which both Contains elements of the metal surface as well as from the conversion solution.
  • conversion solution Typical examples are phosphate layers or chromate layers.
  • further conversion treatment methods are known, for example with conversion solutions based on complex fluorides of boron, silicon, titanium or zirconium. Most of these complex fluorides are used together with organic polymers. Examples of such conversion treatments are in DE-A-101 31 723 and the literature cited there. However, none of these alternative methods has been able to displace the phosphating pretreatment before painting in the automotive industry.
  • pre-coated metal strips are already offered on the market. On the one hand, these can be pre-phosphated, ie they can carry a phosphate layer but no further coating based on organic polymers. In the automotive and household appliance industry, metal strips are increasingly being processed which are already provided with a corrosion protection layer by the manufacturer of the strips.
  • Such materials are known, for example, under the names Granocoat R , Durasteel R , Bonazinc R and Durazinc R. They carry a thin organic coating over a conversion layer, for example a chromating or phosphating layer.
  • the organic coating consists of polymer systems such as epoxy or polyurethane resins, polyamides and polyacrylates. Solid additives such as silicic acids, zinc dust and soot improve the corrosion protection and, due to their electrical conductivity, allow the metal parts coated with layers of about 0.3 to about 10 ⁇ m, preferably up to about 5 ⁇ m, to be electrically welded and electrolytically painted.
  • the coating of the substrate materials is generally carried out in a two-stage process, in which first the inorganic conversion layer is produced and subsequently the organic polymer film is applied in a second treatment stage. More information can be found here DE-A-100 22 075 and the literature cited therein.
  • metal sheets provided in the band method with a coating based on organic polymers are already partially used in the construction of vehicle bodies, household appliances and furnishing articles.
  • the strictest requirements with regard to corrosion protection and adhesion of a subsequently applied Paints since vehicles are exposed to the strongest corrosion stresses.
  • no vehicle bodies are produced exclusively from organically pre-coated metal sheets. Rather, this material is possibly installed together with non-pre-coated sheets to the vehicle bodies.
  • the assembled bodies therefore currently undergo the usual pretreatment process before painting, ie they are subjected to the complex process sequence of phosphating.
  • the phosphating process could be replaced by a less expensive pretreatment process if the vehicle bodies were produced exclusively from organically precoated metal substrate.
  • the problem must be solved that inevitably arise in the assembly of bodies made of organically pre-coated metal sheets in places where the organic precoating is damaged or completely missing. This is the case, for example, at cut edges, at weld points and at cut points.
  • organically precoated metal substrates are frequently used in vehicle construction, in which serves as a metal substrate electrolytically galvanized or hot-dip galvanized steel.
  • the sites mentioned with a damaged organic layer are particularly difficult to treat, since they differ from the usual metal surfaces in terms of their electrochemical potentials and their chemical reactivity.
  • damaged areas are usually both shares of the steel substrate (ie iron) and the zinc coating bare.
  • a high local area ratio of steel (iron) to zinc may be present, for example a ratio of> 9: 1. This is particularly the case with cut edges, which represent a cross section through the coated steel substrate.
  • the corrosion conditions deviate from the other conditions on the homogeneous surface at these boundary areas, which combine zinc and iron. Depending on the local ratio of zinc to iron at the exposed metal sites, a different electrochemical potential arises between the potentials of zinc and iron. Furthermore, when machining the bodies grounded areas that have special conditions and thus special electrochemical potentials. Because the grinding process creates an activated interface of steel (iron) with finely divided reactive zinc.
  • the object of the invention is to provide, as part of a process for the production of painted metallic components which are composed of metal sheets pre-coated with organic polymers, a simpler method than phosphating which can be used to produce corrosion protection and lacquer adhesion at the damaged areas discussed
  • the present invention relates in a first aspect to a "claim 1".
  • All metal parts of the component should accordingly consist of organically pre-coated galvanized steel.
  • the component may still contain plastic components, as may be the case for example in the automotive industry.
  • the metallic components made of organically pre-coated galvanized steel can be assembled with plastic parts.
  • galvanized steel includes hot dip galvanized steels and electrolytically galvanized steels. Furthermore, alloy-galvanized steels are included, in which the coating For example, may consist of a zinc-nickel alloy or a zinc-aluminum alloy. The steels may be tempered to form an iron-zinc alloy at the interface between steel and zinc.
  • the joining of the sheets to the component in step a) can be carried out by the usual methods known in the art, for example by gluing, flanging, riveting, flanging and / or welding, in particular by arc welding.
  • joining by welding due to the associated damage to the coating based on organic polymers to more locations on the component arise that are not covered by the coating based on organic polymers.
  • passivated in sub-step c) as well as bare metal areas that result from grinding.
  • the process according to the invention is particularly suitable for the production of components with organically precoated metal sheets which have a coating based on organic polymers with a thickness in the range from 1 to 10 ⁇ m, the coating containing electrically conductive particles in addition to the organic polymers. Due to these characteristics of the organic coating, the components can be joined together by arc welding. Examples of such coatings are in DE-A-197 48 764 . DE-A-199 51 113 . DE-A-100 22 075 and in the literature cited therein. As mentioned in the introduction, metal strips with such coatings are commercially available under different trade names.
  • the passivation layer produced in sub-step c) should thus not represent a conventional zinc phosphate layer since, according to the present task, a process sequence which is shorter than that of zinc phosphating and thus more economical is to be used.
  • a zinc phosphate layer does not form if the treatment solution does not concurrently contain at least 0.3 g / l zinc ion and at least 3 g / l phosphate ion (as phosphoric acid or any protolysis step thereof).
  • the assembled component can be brought into contact in different ways with the acidic aqueous treatment solution, for example by immersion in the treatment solution or by spraying with the treatment solution. After this step you can rinse with water, but you do not have to. Ie. the method can be used as a "rinse” or "no-rinse” method.
  • the treatment according to sub-step c) does not represent a post-passivation of a preceding major conversion layer formation, but it is the only treatment step after the assembly of the components which produces a passivation layer on the bare metal sites.
  • the method sequence according to the invention can be used in the manufacture of vehicle bodies, household appliances, pieces of furniture, or in each case a part thereof.
  • the aqueous treatment solution in sub-step c) preferably has a pH of at least 2, in particular of at least 2.5, to at most 5, in particular to at most 4.
  • a pH of at least 2 in particular of at least 2.5, to at most 5, in particular to at most 4.
  • the pickling attack is increasingly too weak, so that only an insufficient passivation layer is formed.
  • the transitions in practice are fluent.
  • chromium-free acidic aqueous treatment solutions can be used, which are known in the art for the large-scale treatment of uncoated metal parts or metal strips.
  • a treatment solution is used, the total of at least 0.01 g / l, preferably at least 0.025 g / l, and up to 10 g / l, preferably up to 1 g / l, in particular to 0.5 g / l Ti- and or Zr and / or Si ions and at least one such amount of fluoride contains that the atomic ratio of Ti to F and / or Zr to F and / or Si to F in the range of 1: 1 to 1: 6, and which additionally contains at least 0.005 g / l, preferably at least 0.01 g / l, and up to 20 g / l, preferably up to 1 g / l of organic polymers.
  • the Ti, Zr and / or Si ions mentioned may be mentioned completely in the form of Hexafluorokomplexen such as the hexafluoroacids or their water in said concentration range salts such as the sodium salts. In this case, the atomic ratio is 1: 6.
  • complex compounds in which less than six fluoride ions in each case are connected to the central elements Ti, Zr or Si can form themselves in the treatment solution if hexafluoro complexes of at least one of the central elements Ti, Zr or Si and also at least one further compound of one of these central elements are added to it.
  • the treatment solution may be hexafluorozirconates and (preferably colloidal) silica (SiO 2 ) or their reaction products. Unreacted silica may be suspended in the treatment solution.
  • a treatment solution can also be obtained by using hydrofluoric acid or its (optionally acidic) salts together with those compounds of Ti, Zr and / or Si which can form fluorocomplexes herewith. Examples are the already mentioned nitrates, carbonates, hydroxides and / or oxides.
  • such an amount of Ti, Zr and / or Si is used as the central metal and such an amount of fluoride that the atomic ratio of central metal to fluoride is less than or equal to 1 to 2, in particular less than or equal to 1 to 3.
  • the atomic ratio may also become less than 1 to 6 when the treating solution contains more fluoride, for example in the form of hydrofluoric acid or its salts, than is stoichiometrically required to form the hexafluorocomplexes of the central metals Ti, Zr and / or Si.
  • the atomic ratio may become as small as 1 to 12 or 1:18, or even less, by employing a corresponding excess of fluoride, ie, two or three times or even more times what is necessary to complete formation of the hexafluoro complexes.
  • Suitable homopolymers or copolymers of vinylpyrrolidone are, for example, the polymers or polymers listed in Table 1 of the monomers mentioned there. Copolymers of vinylpyrrolidone with monomers having caprolactam or imidazole groups are particularly preferred.
  • the preferred treatment solutions described above preferably have a temperature in the range from 20 to 45 ° C, in particular from 30 to 40 ° C.
  • This treatment solution is preferably contacted with the cleaned assembled member for a period of time in the range of 1 to 5 minutes, more preferably 2 to 3 minutes.
  • the treatment solutions to be used should be free of chromium. It is further preferred that the acidic aqueous treatment solution except metals of the 4th subgroup of the periodic table (for example in the form of complex fluorides of Ti and / or Zr) contains no other subgroup metals ("transition metals"). As a result, the treatment of wastewater is simplified.
  • the metallic component pretreated in sub-step c), with or without intermediate rinsing as sub-step d), can be coated with a lacquer customary for the intended use.
  • a lacquer customary for the intended use For example, it may be selected from a dip paint, an electrodeposition paint or a powder paint.
  • the present invention relates to a painted component comprising galvanized steel metal parts obtainable by the method described above.
  • galvanized steel metal parts obtainable by the method described above.
  • this is understood to mean that all metal parts of the component consist of organically precoated galvanized steel.
  • the component may still contain plastic components, as may be the case for example in the automotive industry.
  • Example 1 Conversion treatment of molded parts (Material: Electrogalvanized with Granocoat ® ZE coating)
  • Gramocoat ® products are coating systems for galvanized steel on the basis of organic polymers and conductive pigments, as they are explained in detail in the foregoing description. These products are described in patent applications DE-A-100 22 075 (Granocoat ® ZE) and DE-A-100 22 075 Described (Granocoat ® S).)
  • Comparative Example 1 zinc phosphating of molded parts (material: Electrolytically galvanized with Granocoat ® coating ZE)
  • Example 2 Conversion treatment of molded parts (material: electrolytically galvanized with Granocoat ® S coating)
  • Example 3 Conversion treatment of molded parts (Material: Hot dip galvanized steel with Granocoat ® ZE coating)
  • Comparative Example 3 zinc phosphating of molded parts (material: fire galvanized steel with Granocoat ® coating ZE)
  • test results show that with the shorter process sequence according to the invention at least the same results as with a zinc phosphating.
  • the results according to the method of the invention tend to be even better than those achieved with zinc phosphating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Procédé pour la fabrication d'un composant vernis ou laqué contenant des pièces métalliques en acier zingué, dans lequel
    a) on soumet des tôles en acier zingué, qui portent une enduction à base de polymères organiques, à une découpe et/ou à un emboutissage et/ou à un façonnement et on assemble les pièces métalliques ainsi obtenues pour la fabrication du composant, processus au cours duquel apparaissent des zones de la surface métallique de l'acier zingué qui ne sont pas recouvertes par l'enduction à base de polymères organiques et qui présentent un rapport surfacique de l'acier au zinc qui est supérieur à 9:1 ;
    b) on nettoie le composant assemblé ;
    c) on met le composant assemblé nettoyé en contact avec une solution de traitement aqueuse acide exempte de chrome qui génère, sur les zones de la surface métallique, apparues au cours de l'étape partielle a), qui n'ont pas été recouvertes par l'enduction à base de polymères organiques, une couche de passivation qui ne représente pas de couche de phosphate de zinc ;
    d) si on le souhaite, mais sans y être obligé, on rince avec de l'eau à une ou plusieurs reprises le composant traité à l'étape partielle c) ;
    e) on l'enduit d'une couche de laque ou de vernis ;
    procédé dans lequel toutes les pièces métalliques du composant, lors de la mise en oeuvre des étapes partielles b) à e), sont constituées à titre exclusif par les tôles en acier zingué qui portent une enduction à base de polymères organiques, et dans lequel l'étape partielle c) représente la seule étape de traitement, après l'étape partielle a), qui génère une couche de passivation sur les zones de la surface métallique, qui apparaissent au cours de l'étape partielle a), et qui ne sont pas recouvertes par l'enduction à base de polymères organiques.
  2. Procédé selon la revendication 1, caractérisé en ce qu'il s'agit, en ce qui concerne le composant métallique, d'une carrosserie de véhicule, d'un appareil ménager, d'un meuble ou respectivement d'une partie des éléments que l'on vient de citer.
  3. Procédé selon l'une quelconque des revendications 1 ou 2 ou les deux, caractérisé en ce que l'enduction à base de polymères organiques présente une épaisseur dans la plage de 1 à 10 µm et contient en plus des polymères organiques, des particules électroconductrices.
  4. Procédé selon une ou plusieurs des revendications 1 à 3, caractérisé en ce que la solution de traitement aqueuse acide à l'étape partielle c) présente une valeur de pH dans la plage d'au moins 2, de préférence d'au moins 2,5 jusqu'à une valeur maximale de 5, de préférence jusqu'à une valeur maximale de 4.
  5. Procédé selon une ou plusieurs des revendications 1 à 4, caractérisé en ce que la solution de traitement aqueuse acide contient au total des ions Ti et/ou Zr et/ou Si à concurrence d'au moins 0,01 g/l, de préférence à concurrence d'au moins 0,025 g/l, et jusqu'à 10 g/l, de préférence jusqu'à 1 g/l, en particulier jusqu'à 0,5 g/l, et au moins une quantité de fluorure telle que le rapport atomique Ti à F et/ou Zr à F et/ou Si à F se situe dans la plage de 1:1 à 1:6, et en ce que la solution de traitement contient en outre des polymères organiques à concurrence d'au moins 0,005 g/l, de préférence à concurrence d'au moins 0,01 g/l, et jusqu'à 20 g/l, de préférence jusqu'à 1 g/l.
  6. Procédé selon la revendication 5, caractérisé en ce que les polymères organiques sont choisis parmi des homopolymères et des copolymères de vinylpyrrolidone.
  7. Procédé selon une ou plusieurs des revendications 4 à 6, caractérisé en ce qu'on met la solution de traitement aqueuse acide en contact avec le composant assemblé nettoyé à une température dans la plage de 20 à 45 °C, de préférence de 30 à 40 °C pendant un laps de temps dans la plage de 1 à 5 minutes, de préférence de 2 à 3 minutes.
  8. Procédé selon une ou plusieurs des revendications 1 à 7, caractérisé en ce que la solution de traitement aqueuse acide ne contient, en dehors de métaux du quatrième sous-groupe du système périodique, aucun autre métal de sous-groupe (« métaux de transition »).
  9. Procédé selon une ou plusieurs des revendications 1 à 8, caractérisé en ce qu'on enduit le composant métallique à l'étape partielle e) avec une laque ou un vernis qui est choisi parmi un vernis à immersion, une laque appliquée par électrodéposition ou une laque en poudre.
  10. Composant vernis ou laqué contenant des pièces métalliques en acier zingué, que l'on peut obtenir conformément au procédé selon une ou plusieurs des revendications 1 à 9.
  11. Utilisation d'une solution de traitement aqueuse acide contenant des ions Ti et/ou Zr et/ou Si à concurrence d'au moins 0,01 g/l et jusqu'à 10 g/l, et au moins une quantité de fluorure telle que le rapport atomique Ti à F et/ou Zr à F et/ou Si à F se situe dans la plage de 1:1 à 1:6, et qui contient en outre des polymères organiques à concurrence d'au moins 0,005 g/l et jusqu'à 1 g/l, pour un procédé destiné à la fabrication d'un composant vernis ou laqué contenant des pièces métalliques en acier zingué, procédé dans lequel
    a) on soumet des tôles en acier zingué, qui portent une enduction à base de polymères organiques, à une découpe et/ou à un emboutissage et/ou à un façonnement et on assemble les pièces métalliques ainsi obtenues pour la fabrication du composant, processus au cours duquel apparaissent des zones de la surface métallique de l'acier zingué qui ne sont pas recouvertes par l'enduction à base de polymères organiques et qui présentent un rapport surfacique de l'acier au zinc qui est supérieur à 9:1 ;
    b) on nettoie le composant assemblé ;
    c) on met le composant assemblé nettoyé en contact avec la solution de traitement aqueuse acide exempte de chrome qui génère, sur les zones de la surface métallique, apparues au cours de l'étape partielle a), qui n'ont pas été recouvertes par l'enduction à base de polymères organiques, une couche de passivation qui ne représente pas de couche de phosphate de zinc ;
    d) si on le souhaite, mais sans y être obligé, on rince avec de l'eau à une ou plusieurs reprises le composant traité à l'étape partielle c) ; et
    e) on l'enduit d'une couche de laque ou de vernis ;
    toutes les pièces métalliques du composant, lors de la mise en oeuvre des étapes partielles b) à e), étant constituées à titre exclusif par les tôles en acier zingué qui portent une enduction à base de polymères organiques et l'étape partielle c) représentant la seule étape de traitement, après l'étape partielle a), qui génère une couche de passivation sur les zones de la surface métallique, que l'on obtient à l'étape partielle a), qui ne sont pas recouvertes par l'enduction à base de polymères organiques.
EP04022644A 2003-11-14 2004-09-23 Protection supplémentaire contre la corrosion pour des piéces de tôle métallique disposant déjà d'un revêtement organique Expired - Lifetime EP1531012B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10353149 2003-11-14
DE10353149A DE10353149A1 (de) 2003-11-14 2003-11-14 Ergänzender Korrosionsschutz für Bauteile aus organisch vorbeschichteten Metallblechen

Publications (3)

Publication Number Publication Date
EP1531012A2 EP1531012A2 (fr) 2005-05-18
EP1531012A3 EP1531012A3 (fr) 2006-04-05
EP1531012B1 true EP1531012B1 (fr) 2011-07-13

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US (1) US20050121113A1 (fr)
EP (1) EP1531012B1 (fr)
AT (1) ATE516088T1 (fr)
DE (1) DE10353149A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10125424B2 (en) 2012-08-29 2018-11-13 Ppg Industries Ohio, Inc. Zirconium pretreatment compositions containing molybdenum, associated methods for treating metal substrates, and related coated metal substrates

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9347134B2 (en) 2010-06-04 2016-05-24 Prc-Desoto International, Inc. Corrosion resistant metallate compositions
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US10920324B2 (en) 2012-08-29 2021-02-16 Ppg Industries Ohio, Inc. Zirconium pretreatment compositions containing molybdenum, associated methods for treating metal substrates, and related coated metal substrates

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US20050121113A1 (en) 2005-06-09
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ATE516088T1 (de) 2011-07-15
DE10353149A1 (de) 2005-06-16

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