EP2145031A2 - Prétraitement de métallisation de surfaces de zinc - Google Patents

Prétraitement de métallisation de surfaces de zinc

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Publication number
EP2145031A2
EP2145031A2 EP08749904A EP08749904A EP2145031A2 EP 2145031 A2 EP2145031 A2 EP 2145031A2 EP 08749904 A EP08749904 A EP 08749904A EP 08749904 A EP08749904 A EP 08749904A EP 2145031 A2 EP2145031 A2 EP 2145031A2
Authority
EP
European Patent Office
Prior art keywords
metal
cations
compounds
galvanized
agent
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
EP08749904A
Other languages
German (de)
English (en)
Other versions
EP2145031B1 (fr
Inventor
Karsten Hackbarth
Michael Wolpers
Wolfgang Lorenz
Peter Kuhm
Kevin Meagher
Christian Rosenkranz
Marcel Roth
Reiner Wark
Guadalupe Sanchis Otero
Eva Wilke
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.)
Henkel AG and Co KGaA
Original Assignee
Henkel AG and Co KGaA
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Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Priority to EP10187987.2A priority Critical patent/EP2292808B1/fr
Publication of EP2145031A2 publication Critical patent/EP2145031A2/fr
Application granted granted Critical
Publication of EP2145031B1 publication Critical patent/EP2145031B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/54—Contact plating, i.e. electroless electrochemical plating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/48—After-treatment of electroplated surfaces
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
    • C23C2/26—After-treatment
    • 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
    • C23C22/78—Pretreatment of the material to be coated
    • 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
    • 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
    • C23C28/02—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 only coatings only including layers of metallic material
    • C23C28/021—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 only coatings only including layers of metallic material including at least one metal alloy layer
    • 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
    • C23C28/02—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 only coatings only including layers of metallic material
    • C23C28/023—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 only coatings only including layers of metallic material only coatings of metal elements only
    • 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
    • C23C28/02—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 only coatings only including layers of metallic material
    • C23C28/023—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 only coatings only including layers of metallic material only coatings of metal elements only
    • C23C28/025—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 only coatings only including layers of metallic material only coatings of metal elements only with at least one zinc-based layer
    • 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 a process for the metallizing pretreatment of galvanized and / or alloy-galvanized steel surfaces or assembled metallic components, which at least partially comprise surfaces of zinc, in a surface treatment comprising a plurality of process steps.
  • metallic layer deposits of in particular not more than 100 mg / m 2 of molybdenum, tungsten, cobalt, nickel, lead, tin and / or iron are preferably produced on the treated zinc surfaces.
  • Such metallized zinc surfaces are outstandingly suitable as starting material for subsequent passivation and coating steps ( Figure 1, method MV) and cause a significantly higher efficiency of the anti-corrosion coating, in particular after the pretreatment of galvanized metal surfaces according to the invention.
  • the invention therefore comprises an uncoated or subsequently coated metallic component which has been given a metallizing pretreatment according to the invention, as well as the use of such a component in vehicle body construction in automobile manufacturing, shipbuilding, construction and for the production of white goods.
  • the galvanic coupling between core material and metallic coating brings about an active, unimpeded local dissolution of the coating material, which in turn constitutes an activation point for the corrosive infiltration of the organic barrier layer.
  • An essential strategy is to improve the paint adhesion of the organic barrier layer on the surface-treated steel strip.
  • German patent application DE19733972 which includes a method for the alkaline passivating pretreatment of galvanized and alloy-galvanized steel surfaces in strip lines.
  • the surface-treated steel strip is brought into contact with an alkaline treatment agent containing magnesium ions, iron (III) ions and a complexing agent.
  • the zinc surface is passivated thereby forming the corrosion protection layer.
  • Such a passivated surface already offers, according to the teaching of DE19733972, a paint adhesion which is comparable with nickel- and cobalt-containing processes.
  • this pretreatment can be followed by further treatment steps such as chromium-free post-passivation to improve the corrosion protection before the paint system is applied. Nevertheless, it appears that this pretreatment system can not satisfactorily suppress the paint peeling caused by the corrosion at the cut edges.
  • This object was achieved by a method for metallizing pretreatment of galvanized and alloy-galvanized steel surfaces, wherein the zinc surface with a aqueous agent (1) is brought into contact whose pH is not greater than 9, characterized in that cations and / or compounds of a metal (A) in the means (1) are included, the redox potential E Re ciox measured on a Metal electrode of the metal (A) at a predetermined process temperature and concentration of cations and / or compounds of the metal (A) in the aqueous medium (1) is anodic than the electrode potential E Zn of the galvanized or alloy-galvanized steel surface in contact with an aqueous agent (2), which differs from the agent (1) only in that it contains no cations and / or compounds of the metal (A).
  • the method according to the invention is suitable for all metal surfaces, for example strip steel, and / or assembled metallic components, which at least partially also consist of zinc surfaces, for example automobile bodies.
  • the material combination of iron-containing surfaces and zinc surfaces is preferred.
  • pretreatment is defined as the passivation by means of inorganic barrier layers (for example phosphating, chromating) or a process step preceding the lacquer coating for conditioning the cleaned metallic surface.
  • inorganic barrier layers for example phosphating, chromating
  • a process step preceding the lacquer coating for conditioning the cleaned metallic surface.
  • Such conditioning of the surface results in an improvement of the corrosion protection and the paint adhesion for the entire layer system resulting at the end of a process chain for corrosion-protecting surface treatment.
  • FIG. 1 summarizes typical process chains for the purposes of the present invention, which benefit to a particular degree from the pretreatment according to the invention.
  • the specifying designation of the pretreatment as "metallizing” is to be understood as a pretreatment process which directly effects a metallic deposition of metal cations (A) on the zinc surface, after metallizing pretreatment corresponding to at least 50 at.% Of the element (A) the analytical method defined in the example part of this application on the zinc surface in the metallic state.
  • the redox potential E Re.sub.XX is obtained directly on the average (1) on a metal electrode of the metal (A) in relation to a standard commercial reference electrode, eg, silver. Silver chloride electrode, measured.
  • a metal electrode of the metal (A) in relation to a standard commercial reference electrode, eg, silver. Silver chloride electrode, measured.
  • a standard commercial reference electrode eg, silver. Silver chloride electrode
  • E Zn which is determined at a zinc electrode in the middle (2), which differs from the agent (1) only by the absence of cations and / or compounds of the metal (A), compared to a standard commercial reference electrode:
  • the inventive method is characterized by the fact that a metallizing pretreatment of the zinc surface takes place when the redox potential ERedox is more anodic than the electrode potential E 2n - This is the case when E Re cio ⁇ -Ezn> 0.
  • EMF electromotive force
  • EMF is less than +50 mV
  • sufficient metallization of the galvanized surface can not be achieved in technically relevant contact times, so that in a subsequent passivating conversion treatment the metal deposit of the metal (A) is completely removed from the galvanized surface and the effect of the pretreatment therewith will be annulled.
  • an excessively high EMF of more than +800 mV in short times can lead to a complete and massive occupation of the galvanized surface with the metal (A), so that the desired formation of an inorganic corrosion-inhibiting and adhesion-promoting layer does not occur or at least in a subsequent conversion treatment is hindered.
  • metallization is particularly effective when the concentration of cations and / or compounds of the metal (A) is at least 0.001M and preferably at least 0.01M, but does not exceed 0.2M, preferably 0.1M ,
  • the cations and / or compounds of the metal (A), which is deposited on the galvanized surface according to the pretreatment in the metallic state, are preferably selected from cations and / or compounds of iron, molybdenum, tungsten, cobalt, nickel, lead, and / or tin, with iron in the form of iron (II) ions and / or iron (II) compounds being particularly preferred, for example Iron (II) sulfate.
  • the organic salts iron (II) lactate and / or iron (II) gluconate are particularly preferred because of the lower corrosivity of the anions as a source of iron (II) cations.
  • an agent (1) which is suitable for the method according to the invention then contains at least one species of a metal (A) for which the condition regarding the redox potential E Re cio x is fulfilled as defined above.
  • the cathodic is than the normal potential EV of the standard hydrogen electrode (SHE), preferably more than 100 mV, more preferably more than 200 mV more cathodic than the normal potential E ° H2 , whereby the standard potential E ° Me of the metal (A) on the reversible Redox reaction Me 0 -> Me ⁇ + + ne " in an aqueous solution of the metal cation Me ⁇ + with the activity 1 at 25 0 C refers.
  • accelerators with a reducing action are oxo acids of phosphorus or nitrogen and their salts in question, wherein at least one phosphorus atom or nitrogen atom must be present in a middle oxidation state.
  • Such accelerators are, for example, hyposalphous acid, hypo nitric acid, nitrous acid, hypophosphoric acid, hypodiphosphonic acid, diphosphorus (III, V) acid, phosphonic acid, diphosphonic acid and particularly preferably phosphinic acid and salts thereof.
  • accelerators known to the person skilled in the art in phosphating In addition to their reduction properties, these also have depolarizing properties, ie they act as hydrogen scavengers, thus additionally promoting the metallization of the galvanized steel surface. These include hydrazine, hydroxylamine, nitroguanidine, N-methylmorpholine-N-oxide, glucoheptonate, ascorbic acid and reducing sugars.
  • the molar ratio of accelerator to the concentration of the cations and / or compounds of the metal (A) in the aqueous medium (1) is preferably not greater than 2: 1, more preferably not greater than 1: 1 and preferably not below 1: 5.
  • the aqueous agent (1) in the process according to the invention additionally contain small amounts of copper (II) cations, which can also be deposited metallically on the galvanized surface simultaneously with the cations and / or compounds of the metal (A).
  • the aqueous agent (1) should additionally contain not more than 50 ppm, preferably not more than 10 ppm, but at least 0.1 ppm of copper (II) cations.
  • the aqueous agent (1) for the metallizing pretreatment may additionally contain surfactants which are able to liberate the metallic surface from impurities without itself inhibiting the surface by forming compact adsorbate layers for the metallization.
  • Nonionic surfactants with average HLB values of at least 8 and at most 14 may be used for this purpose.
  • the pH of the aqueous composition should not be less than 2 and not greater than 6, preferably not greater than 4, on the one hand to prevent over-pickling of the galvanized steel surface at low pH, as this inhibits the metallization of the surface, and on the other hand, to ensure the stability of the ferrous ions in the treatment solution.
  • the iron (II) -containing treatment solution may also contain chelating complexing agents with oxygen and / or nitrogen ligands for stabilization. Such a treatment solution is additionally useful for increasing the EMF for metallization since iron (II) ions are less complexed by such ligands than zinc (II) ions.
  • the increase in the emf via the addition of the complexing agents is important for the setting of a shorter treatment time and an optimal iron coverage of the galvanized surface.
  • Suitable chelating complexing agents are in particular those which are selected from triethanolamine, diethanolamine, monoethanolamine, monoisopropanolamine, aminoethylethanolamine, 1-amino-2,3,4,5,6-pentahydroxyhexane, N- (hydroxyethyl) ethylenediaminetriacetic acid, ethylenediaminetetraacetic acid, Diethylenetriaminepentaacetic acid, 1, 2-diaminopropanetetraacetic acid, 1, 3-diaminopropanetetraacetic acid, tartaric acid, lactic acid, mucic acid, gallic acid, gluconic acid and / or glucoheptonic acid and their salts and stereoisomers as well as sorbitol, glucose and glucamine and their stereoisomers.
  • a particularly effective formulation of the aqueous agent (1) with the aforementioned complexing agents is at a molar ratio of chelating complexing agent to the concentration of cations and / or bivalent iron compounds of not greater than 5: 1, preferably not greater than 2: 1, but given at least 1: 5.
  • Lower molar ratios than 1: 5 change the EMF for metallization only insignificantly.
  • higher molar ratios than 5: 1 in which a high proportion of free complexing agent is present, so that the EMF for metallization remains virtually unaffected and results in an uneconomical procedure.
  • poly (5-vinyl-2-hydroxy-N-benzyl-N-glucamine) to use because of its pronounced complexing effect.
  • Analogous to the complexation of the iron (II) ions with low molecular weight complexing agents for the polymeric compounds is a molar ratio of chelating complexing agent, defined as the concentration of monomer units of the water-soluble and / or water-dispersible polymeric compound to the concentration of cations and / or compounds of the metal (A ), not greater than 5: 1, preferably not greater than 2: 1, but at least 1: 5 particularly effective.
  • the pH of the aqueous agent (1) is preferably not less than 4 and preferably not greater than 8, more preferably not larger than 6.
  • the application methods customary in strip steel production and strip steel finishing are practicable. These include, in particular, dipping and spraying processes.
  • the contact time or pretreatment time with the aqueous agent (1) should be at least 1 second but not longer than 30 seconds, preferably not longer than 10 seconds.
  • the metallic layer support is defined in the sense of the present invention as the area-related mass fraction of the element (A) on the galvanized or alloy-galvanized steel surface immediately after the pretreatment according to the invention.
  • Both the preferred contact times and layer conditions as well as the preferred application methods also apply to the pretreatment according to the invention of components assembled from a plurality of metallic materials insofar as these at least partially have zinc surfaces.
  • the present invention also includes those combinations of alloy-galvanized steel surfaces and aqueous compositions (1) in which an alloying constituent of the galvanized steel surface is the same element (A) as the metal (A) in the form of its cations and / or compounds in the aqueous medium (1).
  • an alloying constituent of the galvanized steel surface is the same element (A) as the metal (A) in the form of its cations and / or compounds in the aqueous medium (1).
  • hot-dip galvannealed ® -Feinblech according to the invention with a means (1) ferrous ions are pre-treated with the consequence containing that result in a subsequent application of corrosion protective coatings easily improved corrosion and infiltration characteristics.
  • the pretreatment process according to the invention is adapted to the subsequent process steps of the surface treatment of galvanized and / or alloy-galvanized steel surfaces with regard to optimized corrosion protection and outstanding paint adhesion, especially at cut edges, surface defects and bimetal contacts. Consequently, the present invention encompasses various aftertreatment processes, ie conversion and lacquer coatings, which, in conjunction with the pretreatment described above, provide the desired results in terms of corrosion protection.
  • Figure 1 illustrates various preferred within the meaning of the present invention process chains for anti-corrosive coating of metallic surfaces in automotive manufacturing, which already started at the steel producer ("Coil Industry") and continued and completed in the paint shop (“Paint Shop”) at the car manufacturer.
  • the invention therefore relates in a further aspect to the production of a passivating conversion coating on the metallized pretreated galvanized and / or alloy-galvanized steel surface with or without intermediate rinsing and / or drying step ( Figure 1, method IIa).
  • a chromium-containing or preferably chromium-free conversion solution can be used.
  • Preferred conversion solutions with which the metal surfaces pretreated according to the present invention can be treated prior to the application of a permanent corrosion-protective organic coating can be found in DE-A-199 23 084 and in the literature cited therein.
  • a chromium-free aqueous conversion agent besides hexafluoro anions of Ti, Si and / or Zr may contain as further active ingredients: phosphoric acid, one or more compounds of Co, Ni, V, Fe, Mn, Mo or W, a water-soluble or water-dispersible film-forming organic polymer or copolymer and organophosphonic acids that have complexing properties.
  • water-soluble and / or water-dispersible polymeric complexing agents with oxygen and / or nitrogen ligands based on Mannich addition products of polyvinylphenols with formaldehyde and aliphatic amino alcohols may be present.
  • Such polymers are disclosed in US Pat. No. 5,298,289.
  • the process parameters for a conversion treatment in the context of this invention are to be chosen such that a conversion layer is produced, the per m 2 surface at least 0.05, preferably at least 0.2, but not more than 3, Contains 5, preferably not more than 2.0 and more preferably not more than 1, 0 mmol of the metal M, which is the essential component of the conversion solution.
  • metals M are Cr (III), B, Si, Ti, Zr, Hf.
  • the coverage of the zinc surface with the metal M can be determined, for example, by an X-ray fluorescence method.
  • the chromium-free conversion medium additionally contains copper ions.
  • the molar ratio of metal atoms M selected from zirconium and / or titanium to copper atoms in such a conversion agent is preferably chosen such that it produces a conversion layer in which at least 0.1, preferably at least 0.3, but not more than 2 mmol Copper are also included.
  • the present invention therefore also relates to a process (IIa) which comprises the following process steps, including the metallizing pretreatment and a conversion treatment of the galvanized and / or alloy-galvanized steel surface: i) optionally cleaning / degreasing the material surface ii) metallizing pretreatment with an aqueous agent (1) according to the present invention, iii) optionally, rinsing and / or drying step iv) chromium (VI) -free conversion treatment in which a conversion layer is produced, which contains from 0.05 to 3.5 mmol of metal m per m 2 surface, the essential the Component of the conversion solution, wherein the metals M are selected from Cr (III), B, Si, Ti, Zr, Hf.
  • a method (IIa) in which the metallizing pretreatment is followed by a conversion treatment to form a thin amorphous inorganic coating
  • a method ( Figure 1, IIb) may also be employed in which the metallization of the invention comprises zinc phosphating to form a crystalline phosphate layer a preferred coating weight of not less than 3 g / m 2 follows.
  • the metallizing pretreatment and the subsequent conversion treatment usually follow further process steps for the application of additional layers, in particular organic paints or coating systems ( Figure 1, method IM-V).
  • the present invention therefore relates in a further aspect to a method (IM) which extends the process chain (i-iv) of process (M), wherein an organic coating agent (1) is applied, which dissolved or dispersed in an organic solvent or solvent mixture contains organic resin components, characterized in that the coating composition (1) contains at least the following organic resin components: a) as a hydroxyl-containing polyether epoxy resin based on a bisphenol-epichlorohydrin polycondensation product, b) blocked aliphatic polyisocyanate, c) unblocked aliphatic polyisocyanate, d) at least one reaction component selected from hydroxyl-containing polyesters and hydroxyl-containing poly (meth) acrylates.
  • organic resin components a) as a hydroxyl-containing polyether epoxy resin based on a bisphenol-epichlorohydrin polycondensation product, b) blocked aliphatic polyisocyanate, c) unblocked aliphatic polyisocyanate, d
  • Component a) is a fully reacted polycondensation product of epichlorohydrin and a bisphenol. This essentially has no epoxide groups as reactive groups more.
  • the polymer is then in the form of a hydroxyl-containing polyether, which can undergo crosslinking reactions with, for example, polyisocyanates via these hydroxyl groups.
  • the bisphenol component of this polymer can be selected, for example, from bisphenol A and bisphenol F.
  • the average molar mass (according to the manufacturer, for example determinable by gel permeation chromatography) is preferably in the range from 20,000 to 60,000, in particular in the range from 30,000 to 50,000.
  • the OH number is preferably in the range from 170 to 210 and in particular in the range from 180 to 200.
  • polymers are preferred whose hydroxyl content based on the Estherharz in the range of 5 to 7 wt .-%.
  • the aliphatic polyisocyanates b) and c) are preferably based on HDI, in particular on HDI trimer.
  • the customary polyisocyanate blocking agents may be used as blocking agents in the blocked aliphatic polyisocyanate b.
  • the customary polyisocyanate blocking agents may be used. Examples which may be mentioned are: butanone oxime, dimethylpyrazole, malonic esters, diisopropylamine / malonic esters, diisopropylamine / triazole and e-caprolactam.
  • a combination of malonic ester and diisopropylamine is used as the blocking agent.
  • the content of blocked NCO groups of component b) is preferably in the range from 8 to 10% by weight, in particular in the range from 8.5 to 9.5% by weight.
  • the equivalent weight is preferably in the range of 350 to 600, in particular in the range of 450 to 500 g / mol.
  • the non-blocked aliphatic polyisocyanate c) preferably has an equivalent weight in the range of 200 to 250 g / mol and an NCO content in the range of 15 to 23 wt%.
  • an aliphatic polyisocyanate can be selected which has an equivalent weight in the range of 200 to 230 g / mol, in particular in the range of 210 to 220 g / mol and an NCO content in the range of 18 to 22 wt .-%, preferably in the range from 19 to 21% by weight.
  • Another suitable aliphatic polyisocyanate has for example an equivalent weight in the range of 220 to 250 g / mol, in particular in the range of 230 to 240 g / mol and an NCO content in the range of 15 to 20 wt .-%, preferably in the range of 16 , 5 to 19 wt .-%.
  • Each of these aliphatic polyisocyanates mentioned may be component c). However, a mixture of these two polyisocyanates can also be present as component c). If a mixture of the two mentioned polyisocyanates is used, the ratio of the first-mentioned polyisocyanate to the last-mentioned polyisocyanate for component c) is preferably in the range from 1: 1 to 1: 3.
  • Component d) is selected from hydroxyl-containing polyesters and hydroxyl-containing poly (meth) acrylates.
  • a hydroxyl-containing poly (meth) acrylate having an acid number in the range of 3 to 12, in particular in the range of 4 to 9 mg KOH / g can be used.
  • the content of hydroxyl groups is preferably in the range of 1 to 5 and in particular in the range of 2 to 4 wt .-%.
  • the equivalent weight is preferably in the range of 500 to 700, in particular in the range of 550 to 600 g / mol.
  • a hydroxyl-containing polyester is used as component d
  • a branched polyester having an equivalent weight in the range from 200 to 300, in particular in the range from 240 to 280 g / mol can be selected for this purpose.
  • a weakly branched polyester having an equivalent weight in the range of 300 to 500, in particular in the range of 350 to 450 g / mol is suitable.
  • These different types of polyester can form component d) either alone or as a mixture.
  • a mixture of hydroxyl-containing polyesters and hydroxyl-containing poly (meth) acrylates may also be present as component d).
  • the coating composition (1) in process (III) according to the invention thus contains both a blocked aliphatic polyisocyanate b) and an unblocked aliphatic polyisocyanate c).
  • the hydroxyl-containing components a) and d) are available. Possible reaction of each of components a) and d) with each of components b) and c) produces a complex polymer network of polyurethanes during curing of the agent (2).
  • hydroxyl-containing poly (meth) acrylates are used as component d)
  • further crosslinking via the double bonds of these components occur.
  • component d) consists at least partially of hydroxyl-containing poly (meth) acrylates.
  • the coating composition (1) is cured in the process (III) according to the invention, it is to be expected that initially the non-blocked aliphatic polyisocyanate c) reacts with one or both of components a) and d). If the hydroxyl groups of the components d) are more reactive than those of the component a), during curing, first of all, a reaction of the component c) with the component d) occurs.
  • the blocked aliphatic polyisocyanate b) only reacts with one or both of the components a) and d) when the deblocking temperature is reached.
  • Polyurethane formation is then only that of the reactants a) and d) available, which has the less reactive OH groups.
  • the coating composition (1) contains, in addition to the components a) to d), a conductive pigment or a mixture of conductive pigments. These may have a relatively low density, such as carbon black and graphite, or a relatively high density, such as metallic iron.
  • the absolute content of the coating composition (1) of the conductivity pigments depends on their density, since it depends less on the mass fraction than on the volume fraction of the conductive pigment in the cured coating for the effect as a conductive pigment.
  • the coating composition (1) based on the total mass of the composition, contains (0.8 to 8) p% by weight of conductive pigment, where p is the density of the conductive pigment or the average density of the mixture of conductive pigments in g / cm 3 means.
  • the coating composition (1) based on its total mass (2 to 6) p wt .-% of conductive pigment.
  • the coating composition (1) based on its total mass, preferably contains at least 6.32, in particular at least 15.8 wt .-% and not more than 63 , 2, in particular not more than 47.4 wt .-% Accordingly, the Gew.-proportions are calculated, if as a conductive pigment, for example, exclusively MoS 2 with a density of 4.8 g / cm3, aluminum with a density of 2.7 g / cm 3 or zinc with a density of 7.1 g / cm 3 is used.
  • the coating composition (1) contains not only a single conductive pigment but a mixture of at least two conductive pigments, which then differ greatly in their density.
  • a mixture can be used in which the first mixing partner is a light conductive pigment such as carbon black, graphite or aluminum and the second partner of the mixture is a heavy conductive pigment such as zinc or iron.
  • the average density of the mixture is used, which can be calculated from the weight percentages of the components in the mixture and from their respective density.
  • a specific embodiment of a coating agent (1) in the process (NIb) is characterized in that it contains both a conductive pigment having a density of less than 3 g / cm 3 and a conductive pigment having a density of greater than 4 g / cm 3 in which the total amount of conductive pigment, based on the total mass of the agent (2), is (0.8 to 8) p% by weight, p being the average density of the mixture of conductive pigments in g / cm 3 .
  • the coating agent (1) as a conductive pigment, a mixture of carbon black or graphite on the one hand and iron powder on the other hand.
  • the coating composition (1) may therefore contain aluminum flakes, graphite and / or carbon black as a light electrically conductive pigment.
  • the use of graphite and / or carbon black is preferred.
  • Carbon black, and especially graphite not only provide electrical conductivity of the resultant coating, but also contribute to this layer having a desirable low Mohs hardness of not more than 4 and being readily reshapeable.
  • the lubricating effect of graphite contributes to a reduced wear of the forming tools. This effect can be further promoted by additionally using pigments with a lubricating effect such as molybdenum sulfide with.
  • the coating agent (1) may contain waxes and / or Teflon.
  • the electrically conductive pigment having a specific weight of at most 3 g / cm 3 may be in the form of small spheres or aggregates of such spheres. It is preferred that the balls or the aggregates of these balls have a diameter of less than 2 microns. However, these electrically conductive pigments are preferably in the form of platelets whose thickness is preferably less than 2 ⁇ m.
  • the coating composition (1) in the process (IM) according to the invention contains at least the resin components described above and also solvents.
  • the resin components a) to d) are usually present in their commercial form as a solution or dispersion in organic solvents.
  • the coating composition (1) prepared therefrom then also contains these solvents.
  • the electrically conductive pigment such as, for example, graphite and optionally further pigments such as, in particular, anticorrosive pigments to set a viscosity which allows the coating agent (1) to be applied to the substrate in the coil coating process.
  • additional solvent can be added.
  • the chemical nature of the solvents is usually dictated by the choice of raw materials containing the appropriate solvent.
  • Cyclohexanone may be present as a solvent: Cyclohexanone, diacetone alcohol, diethylene glycol monobutyl ether acetate, diethylene glycol, propylene glycol methyl ether, propylene glycol n-butyl ether, methoxypropyl acetate, n-butyl acetate, xylene, dimethyl glutarate, dimethyl adipate and / or dimethyl succinate.
  • the preferred proportion of solvent, on the one hand, and organic resin components, on the other hand, in the coating agent (1) depends, when expressed in weight percent, on the proportion of conductive pigment in weight percent in the coating agent (1).
  • the preferred weight percentages of solvent and resin components therefore depend on the density p of the conductivity pigment used or the mean density p of a mixture of conductive pigments.
  • the coating means (1) in the inventive method (IM) that is preferably, based on the total mass of the coating composition (1) [(25 to 60) ⁇ adaptation factor] wt .-%, preferably [(35 to 55) ⁇ adjustment factor ] wt% organic solvent and [(20 to 45) ⁇ adjustment factor ] wt%, preferably [(25 to 40) ⁇ adjustment factor] wt%, containing organic resin components, the sum of the weight percentages of organic Resin component and solvent not greater than [93 ⁇ adjustment factor] wt .-%, preferably not greater than [87 ⁇ adaptation factor] wt .-% and wherein the adjustment factor [100-2,8p]: 93.85 and p is the density of the conductive pigment or the average density of the mixture of conductive pigments in g / cm 3 .
  • the coating agent (1) based on the total mass of the coating agent (1), be [(2 to 8) ⁇ adjustment factor ]% by weight, preferably [(3 to 5) ⁇ adjustment factor ] Wt .-% of the resin component a), wherein the adjustment factor [100-2,8p]: 93.85 and p is the density of the conductive pigment or the average density of the mixture of conductive pigments in g / cm 3 . From the proportion of the resin component a) can be with the above-mentioned preferred ratios of the individual resin components, the preferred proportions of the resin components b) to d) in the coating agent (1).
  • the proportion of components b) in the total mass of the coating agent [(2 to 9) can be ⁇ adjustment factor ]% by weight, preferably [(3 to 6) ⁇ adaptation factor]% by weight, the proportion of resin components c) [ (4 to 18) ⁇ Adjustment factor] Wt%, preferably [(6 to 12) ⁇ Adjustment factor] Wt% and the proportion of resin components d) [(7 to 30) ⁇ Adjustment factor] Wt%, preferably [ (10 to 20) ⁇ Adjustment factor ] wt%.
  • the layer b) additionally contains corrosion inhibitors and / or anticorrosion pigments, in which case corrosion inhibitors or anticorrosive pigments which are known in the prior art for this purpose can be used
  • corrosion inhibitors or anticorrosive pigments which are known in the prior art for this purpose can be used
  • Magnesium oxide pigments, in particular in nanoscale form, finely divided and very finely divided barium sulfate or anticorrosive pigments are based on calcium silicate
  • the preferred weight fraction of the anticorrosion pigments on the total mass of the coating composition (1) depends in turn on the density of the anticorrosive pigments used.
  • the mechanical and chemical properties of the coating obtained after the baking of the coating agent (1) in process (III) according to the invention can be further improved by additionally containing fillers.
  • these may be selected from silicas or silicas (optionally hydrophobed), alumina (including basic alumina), titania and barium sulfate.
  • the coating composition is (1) [(0.1 to 3) ⁇ adaptation factor ] wt .-%, preferably [(0.4 to 2) ⁇ adjustment factor ] wt .-% filler selected from silicas or Silicon oxide, aluminum oxide, titanium dioxide and barium sulfate, where the adjustment factor is [100-2.8 p]: 93.85 and p is the density of the conductive pigment or the average density of the mixture of conductive pigments in g / cm 3 .
  • the coating agent (1) based on its total weight, lubricants or forming, preferably selected from waxes, molybdenum sulfide and Teflon, preferably in an amount of [(0.5 to 20) ⁇ Adjustment factor], especially in an amount of [(1 to 10) ⁇ adjustment factor] wt%, where the adjustment factor is [100-2.8p]: 93.85 and p is the density of the conductive pigment or the average density of the mixture of conductive pigments in g / cm 3 .
  • the process (III) according to the invention which comprises the application of organic paints, accordingly consists of the following process chain: i) optionally cleaning / degreasing the material surface ii) metallizing pretreatment with an aqueous agent (1) according to the present invention iii) optionally rinsing and / or drying step iv) chromium (VI) -free conversion treatment in which a conversion layer is produced, which contains 0.01 to 0.7 mmol of metal m per m 2 surface, that is the essential component of the conversion solution, the metals m selected are made of Cr (III), B, Si, Ti, Zr, Hf. v) optionally rinsing and / or drying step vi) coating with a coating agent (1) as described above and curing at a substrate temperature in the range 120-260 0 C, preferably in the range of 150 to 170 0 C.
  • steps (i-vi) are carried out as a strip treatment method, wherein the liquid coating composition (1) is applied in step (vi) in such an amount that, after curing, the desired layer thickness is in the range from 0.5 to 10 receives ⁇ m.
  • the coating agent (1) is applied in the so-called CoN coating process.
  • continuous metal strips are continuously coated.
  • the coating agent (1) can be applied by different methods, which are familiar in the prior art. For example, applicator rolls can be used to directly adjust the desired wet film thickness. Alternatively, one can the metal strip in the coating agent (1) immerse or spray it with the coating agent (1), after which the desired wet film thickness is adjusted by means of squeeze rolls.
  • step (ii) If metal strips coated immediately before with a metal coating, for example with zinc or zinc alloys, electrolytically or by hot dip coating, it is not necessary to clean the metal surfaces prior to performing the metallizing pretreatment (ii). However, if the metal strips have already been stored and in particular provided with corrosion protection oils, a purification step (i) is necessary before carrying out step (ii).
  • the coated sheet is heated to the required drying or crosslinking temperature for the organic coating.
  • Such pre-coated metal sheets are tailored and converted in the automotive production for the production of bodies accordingly.
  • the assembled component or the assembled body shell therefore has unprotected edges, which must be treated in addition corrosion protection.
  • the so-called "paint shop” therefore, there is a further corrosion-protective treatment and, ultimately, the realization of the automobile-typical paint structure.
  • the present invention therefore relates, in a further aspect, to a process (IV) which extends the process chain (i-vi) of process (III), wherein a crystalline phosphate layer is first deposited on the exposed metal surfaces, in particular on the cut edges, in order to subsequently by means of dip paint a final corrosion protection, in particular protection against infiltration of the paint system at the cutting edges realize.
  • IM initial coating in process
  • organic coating agent (1) the entire metallic component, including the phosphated cut edges and the first-coated areas in the process (IM) can be electrocoated (Figure 1, Methods IVb).
  • the initial coating is not sufficiently conductive, only the phosphated cutting edges are electrocoated, without any further coating being applied on the first coated surfaces.
  • the cut edges are not phosphated but coated with a self-depositing dip (AC) ( Figure 1, procedure IVc).
  • the present invention is distinguished by the fact that the zinc surfaces pretreated in a metallizing manner according to the invention in particular excellently prevent edge corrosion.
  • the present invention relates to the galvanized and / or alloy-galvanized steel surface and the metallic component, which consists at least partially of a zinc surface which has been pretreated by metallizing in accordance with the process according to the invention with the aqueous agent (1) or subsequently this pretreatment with further passivating Conversion layers and / or paints, eg according to the inventive method (M-IV), coated.
  • Such a treated steel surface or treated component is used in body construction in automotive manufacturing, shipbuilding, construction and for the production of white goods.
  • the measuring chain consists of two galvanic half cells, one half cell containing the agent (1) containing cations and / or compounds of one metal (A), while the other half cell contains the means (2) differing from the agent (1), that it does not have any of cations and / or compounds of a metal (A). Both half-cells are connected to a salt bridge and the voltage difference between a metal electrode of the metal (A) in the middle (1) and a zinc electrode in the middle (2) is measured without current.
  • a positive EMF means that the redox potential E Re cio x of the cations and / or compounds of the metal (A) on average (1) is anodic than the electrode potential E 2n -
  • the EMF is measured according to a measuring chain analogous to Figure 2 documents for an agent (1) containing iron (II) cations, which is suitable for the metallizing pretreatment according to the invention.
  • the electrolytically galvanized sheet steel (ZE) is treated with alkaline cleaners (eg Ridoline ® C 72, Ridoline ® 1340; dip, spray cleaning products of the applicant) degreased,
  • alkaline cleaners eg Ridoline ® C 72, Ridoline ® 1340; dip, spray cleaning products of the applicant
  • B1 27.8 g / l FeSO 4 TH 2 O
  • B2 13.9 g / l FeSO 4 TH 2 O.
  • rinsing step by immersing the pretreated sheet in city water;
  • a commercial coating composition (1) containing graphite as a conductive pigment based on the composition given in the German application (DE 102007001654.0) in the example (see Example 1) is applied with a chemcoater on the pretreated sheets and by heating in a drying oven at 160 0 C substrate temperature cured.
  • the application of the coating agent provides dry film thicknesses of 1, 8 microns
  • the layer coating of iron on the electrolytically galvanized steel surface can be brought into solution immediately after the process step (ii) wet-chemically in 10 wt .-% hydrochloric acid and determined by atomic absorption spectroscopy (AAS) or alternatively in comparative experiments on pure zinc substrates (99, 9% Zn) by means of X-ray fluorescence analysis (RFA).
  • AAS atomic absorption spectroscopy
  • RMA X-ray fluorescence analysis
  • the process (III) according to the invention is modified in such a way that the process step (ii), ie the metallizing pretreatment, is omitted.
  • inventive method (III) is modified in such a way that instead of the process step (ii) an alkaline passivating pretreatment with the commercial product of the applicant (Granodine ® 1303) according to the German laid-open specification DE19733972 (see there Tab.1, Ex ) based on iron (III) nitrate.
  • Tab. 2 shows the results regarding corrosive paint infiltration at the cutting edge after 10 weeks of alternating climate test. Since the coating infiltration progresses differently at different points of the cut edge, Table 2 contains the respective maximum infiltration in mm for the corresponding coating system.
  • the corrosive infiltration at the Ritz also demonstrates the advantages of the pretreatment according to the invention ("icing" of the zinc surface) as shown in Figure 5.
  • the lower corrosive infiltration compared to merely phosphated and provided with a dip galvanized steel surfaces (V3) on the invention pretreated and coated zinc surfaces (B1) according to a process chain IIa ⁇ lilac ⁇ IVb (see Figure 1)
  • the elimination of the pretreatment according to the invention according to process step I (see Figure 1) in one Treatment method according to Example V1 leads to particularly negative infiltration properties of the overall coating at the scribe.
  • the galvanized steel sheets (ZE, Z) were first cleaned and degreased according to the procedure described above, and then after intermediate rinsing with deionized water ( ⁇ ⁇ 1 ⁇ Scm ⁇ 1 ) according to the invention with an agent which is composed according to Example B1 to be pretreated at a specific pH for 2 sec and a temperature of 50 ° C. ( Figure 1, method I).
  • the conversion treatment carried out after an intermediate rinsing with deionized water was carried out in an acidic aqueous composition of
  • Figures 6 and 7 again show from the X-ray photoelectronic (XPS) detail spectra of Fe (2p 3/2 ) that the thin iron coating applied in the process according to the invention has a metallic character and significantly more than 50 at% of the iron atoms are present in metallic form. Qualitatively, this is evident from the significant shift in the overall peak intensity in favor of peak 1 ( Figure 7) at lower binding energies compared to the intensity of this single peak in alkaline passivation (V2).
  • the quantification is done by default using a numerical fit process of the XP detail spectrum using Gaussian single peaks, which allow the determination of the single peak area.
  • Table 4 gives quantitatively the chemical bonding state of the iron overlay immediately after the respective exemplary (V2) or inventive (B1) pretreatments. Table 4
  • Example Fe metallic / At.% Fe, oxidic / At. -%

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  • General Chemical & Material Sciences (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
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  • Coating With Molten Metal (AREA)
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Abstract

La présente invention concerne un procédé de prétraitement de métallisation de surfaces d'acier galvanisées et/ou galvanisées par alliage ou de composants métalliques assemblés qui présentent au moins partiellement des surfaces de zinc, au cours d'un traitement de surface comprenant plusieurs étapes de processus. Selon ce procédé, des couches métalliques comprenant en particulier pas plus de 100 mg/m2 de molybdène, de tungstène, de cobalt, de nickel, de plomb, d'étain et/ou de préférence de fer sont appliquées sur les surfaces de zinc traitées. Un autre aspect de l'invention concerne un composant métallique, non revêtu ou revêtu ultérieurement, auquel le prétraitement de métallisation selon l'invention a été conféré, ainsi que l'utilisation d'un tel composant dans la fabrication de carrosseries pour la construction automobile, dans la construction navale, dans l'industrie du bâtiment et dans la fabrication de gros appareils électroménagers.
EP08749904.2A 2007-05-04 2008-04-30 Prétraitement de métallisation de surfaces de zinc Active EP2145031B1 (fr)

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DE102007021364A DE102007021364A1 (de) 2007-05-04 2007-05-04 Metallisierende Vorbehandlung von Zinkoberflächen
PCT/EP2008/055308 WO2008135478A2 (fr) 2007-05-04 2008-04-30 Prétraitement de métallisation de surfaces de zinc

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US8293334B2 (en) 2012-10-23
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US20100209732A1 (en) 2010-08-19
PL2292808T3 (pl) 2016-12-30
CN101675181A (zh) 2010-03-17
AU2008248694A1 (en) 2008-11-13
RU2482220C2 (ru) 2013-05-20
EP2145031B1 (fr) 2016-03-16
PL2145031T3 (pl) 2016-09-30
ZA200907724B (en) 2011-04-28
JP2016074985A (ja) 2016-05-12
BRPI0811537A2 (pt) 2014-11-18
HUE028450T2 (en) 2016-12-28
AU2008248694B2 (en) 2012-10-04
EP2292808A1 (fr) 2011-03-09
PT2145031E (pt) 2016-06-16
PT2292808T (pt) 2016-09-08
KR20100028542A (ko) 2010-03-12
ES2575993T3 (es) 2016-07-04
CN101675181B (zh) 2012-10-24
MX2009011876A (es) 2010-02-24
JP5917802B2 (ja) 2016-05-18
EP2292808B1 (fr) 2016-06-08
DE102007021364A1 (de) 2008-11-06
CA2686380A1 (fr) 2008-11-13
ES2589380T3 (es) 2016-11-14
CA2686380C (fr) 2016-04-05
JP2010526206A (ja) 2010-07-29
RU2009144881A (ru) 2011-06-10
WO2008135478A2 (fr) 2008-11-13
WO2008135478A3 (fr) 2009-01-08

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