EP2318566A1 - Prétraitement progressif anticorrosion de surfaces métalliques dans un procédé en plusieurs étapes - Google Patents

Prétraitement progressif anticorrosion de surfaces métalliques dans un procédé en plusieurs étapes

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Publication number
EP2318566A1
EP2318566A1 EP09781448A EP09781448A EP2318566A1 EP 2318566 A1 EP2318566 A1 EP 2318566A1 EP 09781448 A EP09781448 A EP 09781448A EP 09781448 A EP09781448 A EP 09781448A EP 2318566 A1 EP2318566 A1 EP 2318566A1
Authority
EP
European Patent Office
Prior art keywords
water
rinse
rinsing
stage
treatment
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
EP09781448A
Other languages
German (de)
English (en)
Other versions
EP2318566B1 (fr
Inventor
Franz-Adolf Czika
Sophie Cornen
Jens KRÖMER
Michael Frank
Nicole TEUBERT
Jan-Willem Brouwer
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 PL09781448T priority Critical patent/PL2318566T3/pl
Publication of EP2318566A1 publication Critical patent/EP2318566A1/fr
Application granted granted Critical
Publication of EP2318566B1 publication Critical patent/EP2318566B1/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
    • 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
    • C23C22/05—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
    • C23C22/36—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 containing also phosphates
    • C23C22/361—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 containing also phosphates containing titanium, zirconium or hafnium compounds
    • 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
    • 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
    • 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
    • C23C22/77—Controlling or regulating of the coating 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
    • 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
    • C23C22/78—Pretreatment of the material to be coated
    • C23C22/80—Pretreatment of the material to be coated with solutions containing titanium or zirconium compounds

Definitions

  • the present invention relates to a method for optimizing the corrosion-protective pretreatment of metal surfaces and to the resource-saving use of rinse water in such a corrosion-protective pretreatment comprising a conversion treatment step with an aqueous composition containing at least 50 ppm of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds at a pH of 3 to 5.5, wherein a minimum proportion of 10 ppm of the elements B, Si, Ti, Zr and / or Hf is realized in the form of water-soluble compounds in the pre-rinse stage immediately before the actual conversion treatment, and a part of the aqueous composition of the conversion treatment step is contained in the first post-rinse step.
  • the present invention comprises a metallic component which has been treated according to such a method and its use in a process for applying a multi-layer system, in particular a lacquer system containing an organic binder, in industrial production.
  • a metallic component is suitable for the production of white goods, electronic housings, in the construction and architectural sectors, as well as for the production of bodies in automotive production.
  • Corrosion inhibitors which are an acidic aqueous solution of water-soluble compounds of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds, in particular in the form of fluoro complexes have long been known. They are increasingly used as a replacement for chromating, which are increasingly less used because of the toxicological properties of chromium compounds. As a rule, such contain Solutions of water-soluble compounds of elements B, Si, Ti, Zr and / or Hf further anti-corrosive agents that further improve the corrosion protection and paint adhesion.
  • a common process sequence in the anticorrosive pretreatment is the cleaning and degreasing of the metallic surfaces, followed by one or more rinsing stages with different water quality, before the actual conversion treatment takes place. These in turn are followed by one or more rinsing stages for the removal of adhering to the components components of the conversion treatment solution.
  • the coating follows with the organic binder system, which is typically an electrodeposition coating.
  • German Patent Application 198 54 431 describes a method for saving rinse water in the phosphating.
  • the phosphatizing bath overflow and / or the rinsing water are subjected to a treatment process such as reverse osmosis, ion exchange, nanofiltration, electrodialysis and / or heavy metal precipitation and the water phase depleted in metal ions as rinsing water for rinsing the water to be phosphated Metal parts is used after their cleaning.
  • German patent application 102 36 293 has set itself the task to return in the cleaning solution and / or in the first rinse water active ingredients of phosphating in the phosphating solution.
  • suitable process management should additionally preferably a further saving of Rinse water are made possible, so that the phosphating can be operated almost wastewater-free.
  • the prior art thus contains numerous suggestions for saving rinsing water and for recycling valuable substances from the rinsing water after phosphating in the phosphating solution.
  • active ingredients of the conversion treatment solution reach the first rinse water or the cleaning solution.
  • the object of the present invention is now to the corrosion-protective effect of an aqueous pretreatment containing the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds at a pH of 3 to 5.5 in a procedure for pretreatment optimize and thereby establish a resource-saving process as possible.
  • Such a cascading is to be set such that in the stationary state in the pre-rinsing stage (C) the concentration according to the invention of active components of not less than 10 ppm of the elements B, Si, Ti, Zr and / or Hf is realized in the form of water-soluble compounds.
  • the present invention comprises a process for the corrosion-protective pretreatment of metal surfaces in a process sequence comprising a conversion treatment step (D) with an aqueous composition (1) containing in total at least 50 ppm of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds at a pH of from 3 to 5.5, characterized in that the metallic surface successively passes through the following treatment steps:
  • Metallic surfaces in the context of the present invention are surfaces of zinc, galvanized and alloy-galvanized steel, aluminum and its alloys, and steel or iron.
  • effective corrosion protection can be achieved with minimal consumption of rinse water.
  • steel and iron surfaces results in the process sequence according to the invention significantly improved corrosion protection compared to a method without cascading the rinse water.
  • those metal surfaces or joined metallic components are preferred, which at least partially represent or have surfaces of steel and / or iron, particularly preferably those which exclusively represent or have surfaces of steel and / or iron.
  • the process sequence associated with the method according to the invention which consists in the fact that the metallic component to be treated passes successively at least the treatment stages (C), (D) and (E), requires in each case one part of the aqueous composition of the respective treatment stage in the respectively following one Treatment level is abducted.
  • This so-called drag-over is based on the fact that the liquid film adhering to the treated metallic component passes into the respective subsequent treatment stage, but this transfer of aqueous adhesive medium into the respective next treatment stage may be dependent on the
  • the shape and type of components to be treated vary. For example, automotive ballasted squares also have complex geometries that tend to delay more treatment than is the case with pure adhesive water.
  • a carry-over value typical for the pretreatment of automobile bodies is approximately 100 ml of aqueous medium per m 2 of the treated component.
  • the treatment of a first series of metallic components in a process sequence and in a processing as in the method according to the invention can initially be used to delay the respective aqueous compositions of the treatment stages in cascading recycling of the rinse water until all technical parameters of the inventive method with respect Compositions of the treatment steps fulfilled.
  • Such a first series of pretreated components will, as long as the required composition of the treatment stage (C) of the process according to the invention has not yet been achieved, have a poorer corrosion protection, especially on steel and / or iron surfaces.
  • treatment step for the application of an aqueous composition to a metallic component for a defined technical purpose.
  • the conventional conversion treatment containing as active components water-soluble compounds of elements B, Si, Ti, Zr and / or Hf
  • the upstream treatment stages serve the degreasing and cleaning of the components and the liberation of residues from the purification stage and a treatment in the pre-rinse (C) preparatory to the conventional conversion treatment (D).
  • C pre-rinse
  • each treatment stage can independently of one another have one of these two types of application.
  • a method according to the invention is preferred in which the metallic component is brought into contact with the respective aqueous compositions in all the treatment stages in the dipping process.
  • the cascading recycling of aqueous medium from the last rinsing stage to the first rinsing stage carried out in the preferred process according to the invention involves the discharge of a portion of the aqueous medium from the respective treatment stage into the respective treatment stage upstream of the process sequence, but the treatment stage (D) containing the composition (1) is excluded from cascading for a conventional conversion treatment.
  • the cascading according to the invention therefore relates only to rinse water with different composition and function.
  • An optional feed of aqueous composition (1) from the treatment stage (D) into the pre-rinse stage (C) merely serves to adapt and maintain the concentration of the active components in the pre-rinse stage according to the invention, in particular when the method according to the invention is put into operation.
  • cascading is a special technical measure for the active recycling of volumes from the final rinsing stages to the pre-rinsing stages, ie opposite to the process sequence according to the invention Method is preferred such a cascaded recycling of aqueous medium from the last rinse stage to the first rinse stage, which takes place continuously and in particular with a constant volume flow.
  • the rinsing water recirculated via the cascading, which accumulates in the first rinsing stage, can preferably either be discharged into the sewage system via the means of an overflow or be processed from the overflow by means of upstream ultrafiltration and subsequent ion exchange process and / or reverse osmosis and into the last rinsing stage be fed back so that there is a closed rinse water cycle for this case.
  • An advantage of the preferred method according to the invention is therefore that due to the cascading recycling of rinse water from the last Rinsing stage in the first rinse stage less wastewater from the individual treatment stages for metal surface treatment discharged and correspondingly less fresh water must be supplied. This saves resources and increases profitability.
  • a content of conversion treatment solution which is built up by carryover and cascaded recycling, primarily in the first post-rinse stage (E) and the pre-rinse stage (C), has an advantageous effect on the formation of the conversion coating that both the anti-corrosive effect and the paint adhesion, especially on steel and / or iron surfaces, are significantly improved.
  • a total of at least 20 ppm, preferably at least 50 ppm of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds in the pre-rinse (C) are included.
  • this can be achieved by correspondingly setting the cascaded recycling of rinsing water while at the same time carrying over parts of the conversion treatment solution into the final rinsing stages. If the content of elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds is less than 10 ppm, no improvement in the corrosion properties of the treated metallic components can be ascertained and only considerable amounts of rinsing water can be saved.
  • the anticorrosive effect achieved in the process according to the invention is significantly improved over a process sequence which requires only the cascading recycle to the first post-rinse step (E. ) completes.
  • the proportion of elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds in the pre-rinse step (C) is not more than 20%, preferably not more than 10% based on the proportion of the respective element in the conversion treatment step (D), since otherwise the tendency for sludge formation in the rinsing step (C) is increased, which must be counteracted with further technical measures, this would be justified by no significant improvement in the corrosion protection and in the paint adhesion of the treated in the process according to the invention metallic components.
  • the content of active components consisting of the constituents of the aqueous composition (1) of treatment stage (D) in the first post-rinse stage (E) in the process according to the invention due to the continuous carryover of conversion treatment solution by means of the treated metallic components and the concurrent cascading recycling of rinse water this Nachêtstistististi (E) at least equal to the content of these active components in the last pre-rinse (C).
  • the proportion of water-soluble compounds of elements B, Si, Ti, Zr and / or Hf is usually slightly lower than in the first post-rinse step (E).
  • the higher pH values in the last pre-rinse step (C), which tend to be higher than the first post-rinse step, are due to the carry-over of components of the cleaning and degreasing stage, which preferably consists of an alkaline cleaner system.
  • components of the acidic aqueous composition (1) are mainly carried off into the first post-rinse stage (E).
  • the aqueous composition of the conversion treatment step (D) preferably contains more than 100 ppm, more preferably totally more than 400 ppm, but preferably not more than 1500 ppm, more preferably not more than altogether, for a faster and more effective corrosion-protecting conversion of the metal surface 1000 ppm of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds.
  • the sludge formation which is due to the recirculated rinse water also caused by considerable amounts of iron ions and optionally also zinc and aluminum ions, which in turn pass through the pickling attack on the metallic component during the conversion treatment in the treatment stage (D) and can be entrained there in the Nachêtlien, can also be largely suppressed in a preferred embodiment.
  • insoluble metal hydroxides from the recirculating medium of the post-rinse steps thus allows a precise adjustment of the proportion of elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds in the pre-rinse step (C).
  • aqueous compositions (1) bound with fluorine in the form of fluorocomplexes of elements B, Si, Ti, Zr and / or Hf or in excess and unbound in the form of free fluoride A proportion of fluorine in excess and unbound in the form of free fluoride means that more fluoride ions are contained in the solutions than are needed to complex the elements B, Si, Ti, Zr and / or Hf.
  • fluorine-containing water-soluble compounds of the elements B, Si, Ti, Zr and / or Hf exerts an increased pickling attack on the metallic component, which results in a faster and more complete conversion of the metal surface.
  • fluorine-containing aqueous compositions are used in the process according to the invention, certain pH ranges can be defined for the aqueous compositions of the pre-rinse stage and the first post-rinse stage, for which a sufficient stability of the elements B, Si, Ti, Zr and / or Hf in Form of water-soluble compounds containing each composition of the rinsing step and an optimal corrosion protection treatment of the metallic components is given.
  • a pH range of 5.0 to 7.0, in particular 5.8 to 6.2 is preferably set, whereas in the pre-rinse stage (E) it is preferably in the range of 4.0 and 5 , 5 and in particular in the range of 4.8 and 5.2.
  • Higher alkalinity in the rinsing steps either cause the precipitation of hydroxides of the heavy metals, which are entrained during the treatment of the metallic component according to the invention in the rinsing stages, such as iron, or cause the active components in the form of the water-soluble compounds of the elements B, Si , Ti, Zr and / or Hf are partly or completely precipitated with and are thus no longer available in the process according to the invention.
  • the cascaded recycling of aqueous medium from the last rinsing stage to the first rinsing stage is carried out so as to selectively separate iron ions from the fluorine-containing rinse water to be recycled such that at least part of the elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds containing and attributable medium from the Vietnamese Songstinum (E) in the Pre-rinse step (C) does not directly feed back, and one adjusts this portion of the medium to be returned a) with an alkaline solution containing no calcium ions to a pH greater than 5.0, preferably greater than 5.5, b ) separates a forming precipitate from the rinse water, and then fed back the so treated rinse water as part of the returned medium then also in the Vor Meetingch (C).
  • this part of the returned medium no longer contains iron ions, so that the sludge formation in the pre-rinse stage (C) is largely suppressed.
  • the proportion of elements B, Si, Ti, Zr and / or Hf in the form of water-soluble compounds, which are fluoro complexes remains largely unaffected in the aqueous medium by this alkaline treatment.
  • care must be taken that the alkalinity of the portion of the aqueous medium to be recycled does not tend to leave the optimum pH range for the rinse stage (C).
  • the adjustment of the pH in step a) of the selective separation of iron ions from the recirculating fluorine-containing rinse water to values of not greater than 8.0, preferably not greater than 7.0 and more preferably not greater than 6, 0th
  • the separation of the precipitated sludge from the rinse water is possible with conventional techniques such as filtration or centrifugation and sedimentation methods. For example, bag or gravel filters can be used for this purpose.
  • the rinse water freed in this way from soluble heavy metal compounds and the active components can now optionally be subjected to a process known per se, which supplies substantially low-salt or desalted water.
  • This may be an ion exchange method or a reverse osmosis known as such in the art for desalting water.
  • the aqueous solution of Ca (OH) 2 for complete precipitation of the heavy metals and the active components in step a) contains from 0.001 to 0.14% by weight of Ca (OH) 2 .
  • This concentration range is particularly favorable in order to comply with the inventively sought limits of pH and electrical conductivity in the portion of the recirculating rinse water from the Nach Hughespad (E), which is not fed back directly into the pre-rinse (C) at pH-controlled automatic dosing.
  • the present invention relates to a metallic component that has been pretreated in a corrosion-protective manner according to one or more of the preceding claims and its use in a process for applying a multi-layer system, in particular a coating system comprising an organic binder in industrial production.
  • a metallic component is suitable for the production of white goods, electronic housings in the construction and architectural sectors, as well as for the production of bodies in automotive manufacturing.
  • laboratory scale steel sheets were treated in two process chains P1 and P2 with different composition of the individual treatment stages, with the process chains not cascaded and the carryover of conversion treatment solution from stage (D) limited (Table 1). After pretreatment, the sheets were provided with an electrodeposition paint and examined for corrosion and paint adhesion.
  • the process chain P1 simulates a stationary state of the method according to the invention with cascading recycling of rinsing water.
  • the process chain P2 simulates a stationary state of an overrun first rinsing stage (E) without cascading return to the pre-rinsing stages, in which just as much active components are removed in the overflow per time interval as are introduced by carryover per time interval, the proportion of water-soluble compounds of the Elements B, Si, Ti, Zr and / or Hf in the Nachêtch (E) is negligible.
  • Scoring tool Sikkens; Assessment according to Daimler Chrysler PAPP PWT 3002

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  • Chemical & Material Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

La présente invention porte sur un procédé d'optimisation du prétraitement anticorrosion de surfaces métalliques, ainsi que d'utilisation, économisatrice de ressources, d'eau de rinçage lors d'un tel prétraitement anticorrosion. Ce procédé comprend un étage de traitement par conversion par une composition aqueuse contenant au moins 50 ppm des éléments B, Si, Ti, Zr et/ou Hf sous forme de composés solubles dans l'eau à un pH de 3 à 5,5, en présence d'une proportion minimale de 10 ppm des éléments B, Si, Ti, Zr et/ou Hf sous forme de composés solubles dans l'eau dans le dernier étage de pré-rinçage, et une partie de la composition aqueuse de l'étage de traitement par conversion étant présente dans le premier étage de post-rinçage. L'utilisation économisatrice de ressources de l'eau de rinçage est selon l'invention réalisée par recyclage en cascade de l'eau de rinçage, du dernier étage de rinçage au premier étage de rinçage. En outre, la présente invention comprend un composant métallique, qui a été traité par le procédé selon l'invention, et son utilisation dans un procédé d'application d'un système multicouches, en particulier d'un système de peinture contenant un liant organique, lors d'une fabrication industrielle.
EP09781448.7A 2008-08-12 2009-08-04 Prétraitement progressif anticorrosion de surfaces métalliques dans un procédé en plusieurs étapes Active EP2318566B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL09781448T PL2318566T3 (pl) 2008-08-12 2009-08-04 Sukcesywna, przed korozją chroniąca obróbka wstępna powierzchni metalowych w procesie wielostopniowym

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DE102008038653A DE102008038653A1 (de) 2008-08-12 2008-08-12 Sukzessive korrosionsschützende Vorbehandlung von Metalloberflächen in einem Mehrstufenprozess
PCT/EP2009/060063 WO2010018102A1 (fr) 2008-08-12 2009-08-04 Prétraitement progressif anticorrosion de surfaces métalliques dans un procédé en plusieurs étapes

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EP4112773A1 (fr) 2021-07-02 2023-01-04 Henkel AG & Co. KGaA Procédé de construction séquentielle d'une couche de conversion sur des composants comprenant des surfaces en acier

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EP4112773A1 (fr) 2021-07-02 2023-01-04 Henkel AG & Co. KGaA Procédé de construction séquentielle d'une couche de conversion sur des composants comprenant des surfaces en acier
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BRPI0914553B1 (pt) 2019-05-14
PL2318566T3 (pl) 2015-08-31
EP2318566B1 (fr) 2015-03-18
DE102008038653A1 (de) 2010-03-25
CN102124144B (zh) 2014-08-06
ES2539576T3 (es) 2015-07-02
CA2733977C (fr) 2016-06-28
CN102124144A (zh) 2011-07-13
HUE026110T2 (en) 2016-05-30
CA2733977A1 (fr) 2010-02-18
BRPI0914553A2 (pt) 2015-12-15
WO2010018102A1 (fr) 2010-02-18
US8679586B2 (en) 2014-03-25
US20110189401A1 (en) 2011-08-04

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