EP3230491B1 - Réception de métaux légers dans un procédé de prétraitement et de décapage de l'acier - Google Patents

Réception de métaux légers dans un procédé de prétraitement et de décapage de l'acier Download PDF

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Publication number
EP3230491B1
EP3230491B1 EP15804762.1A EP15804762A EP3230491B1 EP 3230491 B1 EP3230491 B1 EP 3230491B1 EP 15804762 A EP15804762 A EP 15804762A EP 3230491 B1 EP3230491 B1 EP 3230491B1
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EP
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Prior art keywords
components
iron
bath solution
reaction rinse
aluminum
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EP15804762.1A
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German (de)
English (en)
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EP3230491A1 (fr
Inventor
Andreas Richard BENDER
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Henkel AG and Co KGaA
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Henkel AG and Co KGaA
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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
    • 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
    • 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
    • C23C22/73—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 characterised by the process
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/08—Iron or steel
    • C23G1/081—Iron or steel solutions containing H2SO4

Definitions

  • the present invention relates to a process for wet-chemical pretreatment of a plurality of iron components and a plurality of aluminum components in series.
  • iron components especially steel components, processed and manufactured.
  • these components are pickled and applied a conversion layer.
  • the components undergo established production lines with a specific sequence of different immersion baths, which are adapted to the chemical composition of the iron components.
  • more and more iron components are replaced by components made of light metal such as aluminum or magnesium.
  • the production lines designed for iron components can not pass through light metals such as aluminum or magnesium because of their properties other than iron.
  • certain dipping baths which are integrated into production lines for iron components and adapted to these components, a very low pH (pH ⁇ 1), so that when passing through such baths, the etching of the light metal components is too large.
  • EP-A-1 571 237 discloses a method for conversion treatment of metal parts made of steel, galvanized steel or aluminum in series.
  • the metal parts are treated with a solution containing 5-5000 ppm of Ti or Zr and 0.1 to 100 ppm of free fluoride and having a pH of 2-6.
  • the invention relates in a first aspect to a process for the wet-chemical pretreatment of a plurality of iron components and a plurality of aluminum components in series, in which each of the iron components passes through first a pickle (1) and subsequently a reaction nozzle (2), successively each of the aluminum components also undergoes the same reaction rinse (2) but without having undergone a pickle (1), the method being characterized in that the pickle (1) is contacted by contacting with a sulfuric acid aqueous bath solution (A) a pH below 1.0 and the reaction rinse (2) by contacting with a sulfuric acid aqueous bath solution (B) containing a total of at least 0.02 g / kg of water-soluble compounds of the elements zirconium and / or titanium, respectively based on the respective elements and their pH is not less than 1.0, takes place.
  • a sulfuric acid aqueous bath solution A
  • the reaction rinse (2) by contacting with a sulfuric acid aqueous bath solution (B) containing a total of at least 0.02
  • the entrained bath solution (A) and the iron ions contained therein have an advantageous effect on the reaction rinse (2), since the iron ions accelerate the formation of the conversion layer on the light metal components and the bath solution (A) the bath solution (B) also acidified, ie can keep a favorable pH in the bath solution (B) constant or at least contributes to the maintenance of the advantageous pH, but this does not fall below a value of 1.0. It has surprisingly been found that a relatively high content of iron ions in the bath solution (B) of up to 10 g per kg bath solution (B) has no negative effect on the bath solution (B) or on the formation of the conversion layer on the light metal components ,
  • the pretreatment according to the invention serves to apply a corrosion-protecting first coating as a primer for organic coatings.
  • the pretreatment therefore always ends with the application of a first organic coating (primer, dip paint, powder coating), which itself is not a pretreatment step in the sense of the present invention.
  • a “variety” as used herein refers to 2 or more, for example, 2, 3, 4, 5, 6, 7, 8, 9, 10, 100, 200, 300, 400 or more.
  • the inventive method relates to a wet chemical pretreatment of a plurality of iron components and a plurality of aluminum components in series.
  • pretreatment in series is the bringing into contact of a large number of components with bath solutions stored in system tanks for pickle (1) and / or reaction blister (2) and / or further wet chemical treatment steps, wherein the individual components are brought into contact one after the other and thus separated in time.
  • wet chemical describes that a change in the chemical finish of at least one of the metallic surfaces of the component to be treated is effected by contact with a liquid, which liquid is usually substantially water.
  • a treatment step is then "wet-chemical” if, during its course, at least one metallic surface brought into contact with the liquid undergoes a pickling removal of at least 0.5 g / m 2 or the liquid contains at least 10 g / kg of organic compounds having a molecular weight of contains at least 100 g / mol or a significant surface coverage is effected with metallic or semi-metallic foreign elements.
  • Foreign elements in this context are metallic or semi-metallic elements whose surface portion in the contact area of the component with the liquid immediately before contacting is less than 5 At .-% measured by X-ray photoelectron spectroscopy (Al-K ⁇ radiation and 54.7 ° angle between the beam incidence and the detector , so-called "Magic Angle").
  • a significant surface coverage is present if the proportion of metallic or semi-metallic foreign elements on at least one metallic surface of the component immediately after the treatment step is greater than 1 mg / m 2 based on the respective foreign element.
  • the pickling (1) or reaction (2) are therefore typical wet chemical treatment steps as well as the activation (3) and the phosphating (4).
  • the iron components used according to the method essentially have surfaces of steel and / or iron, preferably more than 60%, particularly preferably more than 80%, particularly preferably more than 90% of all metallic surfaces of the iron components are surfaces of steel and / or iron.
  • all metallic surfaces of the iron components are surfaces of steel and / or iron.
  • the iron component may optionally contain additives of other metals and / or non-metals. These additives may be selected from the group comprising carbon, silicon, chromium, nickel, manganese, molybdenum, tungsten, and mixtures of the foregoing, but the group is not limited thereto.
  • Aluminum members as used herein have substantially surfaces of aluminum and / or aluminum alloys, preferably more than 60%, more preferably more than 80%, most preferably more than 90% of all metallic surfaces of the Aluminum components Surfaces of aluminum and / or its alloys. In a particularly preferred embodiment of the method according to the invention, all metallic surfaces of the aluminum components are surfaces of aluminum and / or its alloys.
  • the aluminum components may optionally include additives of other metals and / or non-metals. Such additives may be selected from the group comprising silicon, beryllium, magnesium, copper, nickel, zinc, manganese and mixtures of the foregoing, but the group is not limited thereto.
  • each of the iron components passes immediately after a pickle (1) and then a reaction rinse (2), whereas each of the aluminum components through the same reaction rinse (2), but without having the stain (1) to go through.
  • Process steps for a component in the context of serial pretreatment then follow each other "directly" if they are not interrupted by another than the respectively provided subsequent wet-chemical treatment or a rinsing step.
  • the stain (1) is made by contacting the iron component with a sulfuric acid bath solution (A) having a pH below 1.0.
  • the pH is in the range of 0 to ⁇ 1.
  • the bath solution (A) contains water as the main component and sulfuric acid to adjust the desired pH.
  • pH corresponds to the negative decadic logarithm of the hydronium ion activity at 20 ° C and can be determined by pH-sensitive glass electrodes.
  • the plurality of iron components is pickled, wherein on the surface of the component iron in the form of iron ions goes into solution.
  • the bath solution (A) of the stain (1) has a free acid content in points of at least 50, particularly preferably at least 130 to 200, but preferably not more than 400.
  • the "free acidity" in points is determined in accordance with the consumption of 0.1 N sodium hydroxide solution in milliliters until a pH of 4.0 at a withdrawn volume of the respective bath solution of 10 ml and a dilution in the ratio of 1: 5 ,
  • the stain (1) contains not more than 80 g / kg, preferably not more than 60 g / kg of iron ions, but preferably at least 1.0 g / kg of iron ions in each case based on the bath solution (A).
  • the reaction rinse (2) is carried out by bringing the component into contact with a sulfuric acid bath solution (B).
  • Bath solution (B) has a pH not lower than 1.0.
  • the bath solution (B) has a pH of less than 2.5, and more preferably less than 1.8.
  • the preferred pH range of the bath solution (B) is thus 1.0 to ⁇ 1.8.
  • the main component of bath solution (B) is water.
  • the desired pH of the bath solution (B) can be adjusted with the aid of acids, in particular a mixture of sulfuric acid and hydrofluoric acid. In various embodiments, this mixture may comprise at least 0.5% by weight, particularly preferably at least 1% by weight, of sulfuric acid and 1 to 200 ppm, preferably 5 to 50 ppm of hydrofluoric acid.
  • the bath solution (B) of the reaction bowl (2) preferably contains a free acid content in points of at least 3, more preferably of at least 10, but preferably of not more than 30.
  • the reaction bowl (2) additionally contains iron ions in an amount of at least 0.1 g / kg, in particular at least 1 g / kg, but preferably not more than 10 g / kg, more preferably not more than 6 g / kg in each case based on the bath solution (B).
  • the bath solution (B) further comprises a total of at least 0.02 g / kg of water-soluble compounds of the elements zirconium and / or titanium in each case based on the respective elements.
  • the reaction rinse (2) comprises a total of less than 1 g / kg, preferably less than 0.6 g / kg, more preferably less than 0.3 g / kg, but preferably at least 0.1 g / kg, most preferably at least 0.2 g / kg of water-soluble compounds of the elements zirconium and / or titanium in each case based on the respective elements.
  • the water-soluble compounds may be any of the water-soluble compounds of these metals known in the art and suitable for this purpose.
  • compounds are "water-soluble" if their solubility in deionized water having a conductivity of not more than 1 ⁇ Scm -1 at a temperature of 20 ° C. is at least 1 g / L.
  • the water-soluble titanium compounds which can be used according to the invention include in particular salts and esters of titanic acid, the so-called titanates.
  • titanates For example, H 4 TiO 4 and the corresponding alkoxides, such as tetraethyl titanate, can be used for this purpose.
  • titanium (IV) and titanium (III) halides such as TiCl 3 and TiCl 4 can be used.
  • the hexafluoroacids of titanium H 2 TiF 6 and their water-soluble salts can be used, such as (NH 4 ) 2 TiF 6 , Li 2 TiF 6 , K 2 TiF 6 and Na 2 TiF 6 .
  • (NH 4 ) 2 Zr (CO 3 ) 2 (OH) 2 zirconium acetates, zirconium halides such as ZrCl 4 and hexafluorozirconic acid and their salts such as (NH 4 ) 2 ZrF 6 , Li 2 ZrF 6 , K 2 ZrF 6 and Na 2 ZrF 6 are used.
  • H 2 ZrF 6 and their water-soluble salts are suitable.
  • the bath solution (B) it is generally preferred for rapid conversion of the metal surfaces of the components that the bath solution (B) have a minimum level of free fluoride of 5 ppm.
  • the bath solution (B) has an aluminum content of less than 5 g / l. Should this value be reached or exceeded, it may be necessary to lower the aluminum content, for example by partial or complete replacement of the bath solution.
  • the "bringing into contact" of the components with the respective bath solutions in the method according to the invention comprises any such time-limited technical measure due to which a wetting of the components is achieved with the respective bath solution.
  • These measures include, but are not limited to, immersion, spraying, printing, and / or coating with the particular bath solution.
  • the bringing into contact of the plurality of iron or aluminum components with the bath solutions in the pickling (1) and / or the reaction rinse (2) can be carried out over a period of 0.01 min to 10 min, preferably 0.05 min to 5 minutes, more preferably from 0.25 minutes to 3 minutes.
  • contacting may occur at an elevated temperature of the respective bath solution (s).
  • the contacting is carried out at elevated temperature of the bath solutions (A) and (B).
  • the contacting is carried out at a temperature of from 5 ° C to 90 ° C, preferably from 10 ° C to 65 ° C, more preferably from 15 ° C to 40 ° C, and most preferably at 20 ° C up to 30 ° C performed.
  • the stain (1) and the reaction bowl (2) it is possible for the stain (1) and the reaction bowl (2) to be carried out at different temperatures for different lengths of time depending on the respective component, such as composition and size of the surface, and the bath solutions (A) and (B) ,
  • the aluminum components pass through the same reaction bowl (2)
  • the method according to the invention may comprise further steps.
  • the plurality of iron components after the reaction column (2) undergo a wet chemical conversion layer formation, for example on the basis of the same water-soluble compounds as used in the reaction column (2), but at a pH in the range of 2.5. 4,0, or based on a phosphating.
  • the plurality of iron components after the reaction rinse (2) preferably undergo activation (3) followed by phosphating (4).
  • the phosphating (4) is preferably a zinc phosphating.
  • Activation (3), phosphating (4) and zinc phosphating are well established in the art and can be carried out by known methods and chemicals.
  • Activation (3) increases the number of phosphate crystals growing per unit of metal surface during phosphating. Furthermore, the sizes of the single crystals in the final phosphate layer are in some cases considerably reduced, the basis weight of the phosphate layer is reduced, and the time required to cover the metal surface with phosphate crystals is shortened.
  • the activation additionally fixes crystal nuclei on the metal surface, which serve as phosphate nucleation points.
  • the activation may be carried out by any methods and chemicals known in the art and suitable for this purpose.
  • the iron component can be treated with a dispersion of titanium phosphate, tertiary zinc phosphate and / or tertiary iron (II) zinc phosphate.
  • the phosphating (4) can be carried out with the aid of a phosphate-containing solution.
  • the provision of the phosphate-containing solution can be carried out by adding, for example, phosphoric acid and / or salts of phosphoric acid, such as Na 3 PO 4 , K 3 PO 4 , Ca 3 (PO 4 ) 2 or mixtures thereof to water or an aqueous solution.
  • the phosphating (4) is a zinc phosphating
  • the phosphate-containing solution further contains zinc ions.
  • other known in the art agents such as accelerators and heavy metal cations selected from manganese, copper, nickel and / or cobalt ions can be added.
  • the aluminum parts after the reaction rinse (2) do not undergo the phosphating (4), preferably neither the activation (3) nor the phosphating (4), particularly preferably no phosphating, and in particular preferably no further wet-chemical pretreatment but preferably at least one, preferably two rinse steps.
  • a "rinsing step”, as used in the context of the invention, is not a wet chemical treatment step and serves solely to completely or partially remove water-soluble residues, particles and kneading components adhered to the component from a previous wet chemical treatment step, without the component to be treated In the rinsing liquid itself active components are included. So the flushing liquid can only be city water.
  • active components are understood to be exclusively components which have a significant surface coverage of the components with metallic or semimetallic foreign elements, ie elements whose surface portion in the contact region of the component with the liquid containing the active components is less than 5 At immediately before contacting .-% measured by X-ray photoelectron spectroscopy is (Al-K ⁇ radiation and 54.7 ° angle between the beam incidence and detector), or cause organic compounds and thereby consume.
  • a significant surface coverage is in any case when the proportion of metallic or semi-metallic foreign elements on the surfaces of the component immediately after the treatment step is on average greater than 1 mg / m 2 based on the foreign element.
  • the aluminum and iron components before the reaction rinse (2) undergo an alkaline degreasing and cleaning.
  • the aluminum and iron components preferably undergo the same alkaline degreasing and cleaning, whereby the iron components always undergo said degreasing and cleaning before the stain (1).
  • This alkaline degreasing and cleaning can be carried out using any degreasing and cleaning method known in the art and suitable for this purpose. These include, but are not limited to, the treatment with solutions containing agents selected from the group of surfactant-active substances and soaps Group are limited. Alternatively, organic solvents, such as. As alcohols, are used for degreasing and cleaning.
  • a plurality of magnesium components are treated in series, wherein each of the magnesium components also the same reaction rinse (2) as the iron and aluminum components passes through, but without having a stain (1) to go through.
  • Magnetic components have substantially surfaces of magnesium and / or magnesium alloys, preferably more than 60%, more preferably more than 80%, most preferably more than 90% of all metallic surfaces of the magnesium components surfaces of magnesium and / or its alloys.
  • all metallic surfaces of the magnesium components are surfaces of magnesium and / or its alloys.
  • the bath solution (B) of the reaction bowl (2) may be advantageous for the bath solution (B) of the reaction bowl (2) to have a slightly higher pH than the values indicated above as preferred, for example in the range from 2 to 2.5.
  • the period and temperature of the reaction bowl (2), as indicated above for the iron and aluminum components, are transferable to the magnesium components which are subjected to the reaction bowl (2).
  • a method is preferred in which the same undergo no further wet chemical pretreatment, which is a phosphating, preferably no further wet chemical pretreatment, but preferably at least one, more preferably at least two rinsing steps.
  • a rinsing step in the context of the present invention is not a wet-chemical treatment step and serves solely to completely or even partially remove the agent with which the component has previously been treated.
  • Such rinsing steps are known in principle in the prior art.
  • the rinsing step can be adapted to the rinsing step performed before and after. Thus, for example, such a rinsing step with water without additives optionally be carried out at elevated temperature.
  • Water but also additives, such as acids, alkalis, washing-active substances or soaps are added. Further, the components may also be cleaned by means of organic solvents such as alcohols or organic solvent mixtures.
  • the rinsing step may be accomplished by contacting as defined herein.

Claims (14)

  1. Procédé de prétraitement chimique par voie humide d'une pluralité de composants en fer et une pluralité de composants en aluminium en série, dans lequel chacun des composants en fer subit d'abord un décapage (1) puis, immédiatement après, un rinçage de réaction (2), et dans lequel chacun des composants en aluminium subit également le même rinçage de réaction (2), mais sans avoir à subir le décapage (1), caractérisé en ce que le décapage (1) est effectué par mise en contact avec une solution aqueuse de bain d'acide sulfurique (A) présentant un pH inférieur à 1,0 et en ce que le rinçage de réaction (2) s'effectue par mise en contact avec une solution aqueuse de bain d'acide sulfurique (B) contenant au total au moins 0,02 g/kg de composés hydrosolubles des éléments Zr et/ou Ti, rapporté dans chaque cas aux éléments correspondants, et présentant un pH d'au moins 1,0.
  2. Procédé selon la revendication 1, caractérisé en ce que la solution de bain (A) utilisée pour le décapage (1) présente une teneur en acide libre, exprimée en points, d'au moins 50, de manière particulièrement préférée d'au moins 130 à 200, mais de préférence d'au plus 400.
  3. Procédé selon l'une des revendications précédentes ou les deux revendications précédentes, caractérisé en ce que la solution de décapage (1) ne contient pas plus de 80 g/kg, de préférence pas plus de 60 g/kg d'ions fer, mais de préférence au moins 1,0 g/kg d'ions fer, rapporté dans chaque cas à la solution de bain (A).
  4. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que la solution de bain (B) utilisée pour le rinçage de réaction (2) présente une teneur en acide libre, exprimée en points, d'au moins 3, de manière particulièrement préférée d'au moins 10, mais de préférence d'au plus 30.
  5. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que la solution de bain (B) utilisée pour le rinçage de réaction (2) présente un pH supérieur à 1,0, mais de préférence inférieur à 2,5, et de manière particulièrement préférée inférieur à 1,8.
  6. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que la solution de rinçage de réaction (2) contient au total moins de 1 g/kg, de préférence moins de 0,6 g/kg, de manière particulièrement préférée moins de 0,3 g/kg, mais de préférence au moins 0,1 g/kg, et de manière particulièrement préférée au moins 0,2 g/kg de composés hydrosolubles des éléments Zr et/ou Ti, rapporté dans chaque cas aux éléments correspondants et à la solution de bain (B).
  7. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que la solution de rinçage de réaction (2) contient en outre des ions fer en une quantité d'au moins 0,1 g/kg, de préférence d'au moins 1 g/kg, mais de préférence d'au plus 10 g/kg, et de manière particulièrement préférée d'au plus 6 g/kg d'ions fer, rapporté dans chaque cas à la solution de bain (B).
  8. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que les composants en fer subissent, après le rinçage de réaction (2), une activation (3) suivie d'une phosphatation (4), qui consiste de préférence en une phosphatation au zinc.
  9. Procédé selon la revendication 8, caractérisé en ce qu'après le rinçage de réaction (2), les pièces en aluminium ne subissent pas la phosphatation (4), de préférence ni l'activation (3) ni la phosphatation (4), mais de préférence au moins une, et de préférence deux étapes de rinçage.
  10. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'après le rinçage de réaction (2), les composants en aluminium ne subissent aucun autre prétraitement chimique par voie humide, mais de préférence au moins une, et de préférence deux étapes de rinçage.
  11. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'avant le rinçage de réaction (2), les composants en aluminium et en fer subissent un dégraissage alcalin et un nettoyage, de préférence les mêmes dégraissage alcalin et nettoyage, les composants en fer subissant toujours ce dégraissage alcalin et ce nettoyage avant le décapage (1) également.
  12. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce qu'une pluralité de composants en magnésium sont en outre traités en série, chacun des composants en magnésium subissant également le même rinçage de réaction (2) que les composants en fer et en aluminium, mais sans avoir à subir le décapage (1).
  13. Procédé selon la revendication 12, caractérisé en ce qu'après le rinçage de réaction (2), les composants en magnésium ne subissent aucun autre prétraitement chimique par voie humide qui soit une phosphatation, de préférence aucun autre prétraitement chimique par voie humide, mais de préférence au moins une, et de manière particulièrement préférée au moins deux étapes de rinçage.
  14. Procédé selon une ou plusieurs des revendications précédentes, caractérisé en ce que toutes les étapes de traitement chimique par voie humide que subit un composant selon l'invention, certes successivement, mais non immédiatement les unes après les autres, sont entrecoupées d'étapes de rinçage intermédiaires.
EP15804762.1A 2014-12-09 2015-12-03 Réception de métaux légers dans un procédé de prétraitement et de décapage de l'acier Active EP3230491B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014225237.7A DE102014225237B3 (de) 2014-12-09 2014-12-09 Verfahren zur nasschemischen Vorbehandlung einer Vielzahl von Eisen- und Aluminiumbauteilen in Serie
PCT/EP2015/078466 WO2016091703A1 (fr) 2014-12-09 2015-12-03 Réception de métaux légers dans un procédé de prétraitement et de décapage de l'acier

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EP3569743A1 (fr) * 2018-05-16 2019-11-20 Henkel AG & Co. KGaA Nettoyage de charriot dans un cycle d'opération de laquage par électro-immersion
EP4223906A1 (fr) * 2022-02-02 2023-08-09 Henkel AG & Co. KGaA Séquence de procédé pour le dérochage et la passivation d'acier

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WO2016091703A1 (fr) 2016-06-16

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