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EP2326736A1 - Passivation par refroidissement rapide de pièces en aluminium coulé sous pression - Google Patents

Passivation par refroidissement rapide de pièces en aluminium coulé sous pression

Info

Publication number
EP2326736A1
EP2326736A1 EP09781449A EP09781449A EP2326736A1 EP 2326736 A1 EP2326736 A1 EP 2326736A1 EP 09781449 A EP09781449 A EP 09781449A EP 09781449 A EP09781449 A EP 09781449A EP 2326736 A1 EP2326736 A1 EP 2326736A1
Authority
EP
European Patent Office
Prior art keywords
casting
aluminum
aqueous composition
water
soluble
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.)
Withdrawn
Application number
EP09781449A
Other languages
German (de)
English (en)
Inventor
Ulrich JÜPTNER
Stefan Kohler
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Henkel AG and Co KGaA filed Critical Henkel AG and Co KGaA
Publication of EP2326736A1 publication Critical patent/EP2326736A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • 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
    • C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
    • C23C22/56—Treatment of aluminium or alloys based thereon
    • 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
    • C23C22/60—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 alkaline aqueous solutions with pH greater than 8
    • C23C22/66—Treatment of aluminium or alloys based thereon
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F11/00—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
    • C23F11/08—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids
    • C23F11/10—Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent in other liquids using organic inhibitors
    • C23F11/167—Phosphorus-containing compounds
    • C23F11/1676—Phosphonic acids
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/56—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering characterised by the quenching agents
    • C21D1/60—Aqueous agents

Definitions

  • the present invention relates to a method for passivating cast parts made of aluminum and / or its alloys, in which the casting, which is solidified after the liquid casting and removed from the molding, is transferred directly into a quench bath with a passivating aqueous composition.
  • the present invention also encompasses a process for the anticorrosive treatment of castings made of aluminum and / or its alloys, in which the solidified and dissolved out of the molding casting having a temperature of more than 300 0 C with a passivating aqueous composition for quenching the casting in contact is brought, after which a mechanical treatment of the casting and a subsequent cleaning and degreasing step, a further passivating treatment is carried out before the casting is optionally coated with an organic topcoat.
  • the passivating aqueous composition of the quench bath preferably contains at least in total 10 ppm of water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo and / or W based on the respective elements in the processes according to the invention.
  • the present invention comprises a casting of aluminum and / or its alloys, which has been treated in a method according to the invention for passivation or anti-corrosive treatment and the use of such a casting of aluminum and / or its alloys in a process for applying further anti-corrosion layers and / or decorative layer pads.
  • quenching quenching
  • various compositions for the quench bath which, on the one hand, have an optimized cooling rate in the Quenching and on the other to provide temporary protection against corrosion of the quenched casting.
  • German laid-open specification DE 3220931 discloses aqueous quenching media for metals, in particular for iron alloys, which contain from 0.1 to 30% by weight of polyoxyalkylene glycol ethers. On the basis of temperature / time curves for the quenching process, a positive influence of the addition of polyoxyalkylene glycol ethers on the cooling process could be demonstrated, which is that the cooling rate during cooling is maximized via steam skin formation and the cooling rate during cooling under nucleate boiling is minimized.
  • DE 3220931 also discloses corrosion inhibitors based on salts of organic oxo acids with alkanolamines, which additionally influence the cooling characteristic. Further, in DE 3220931 further polymeric additives from the prior art are cited, which can be used for the optimization of the quenching process. These include, for example, polyvinyl alcohols, polyamides and salts of polyacrylic acid.
  • No. 4,595,425 describes nitht-free corrosion-inhibiting quench baths for steel in the form of aqueous compositions containing aromatic carboxylic acids with nitrogen-containing substituents which additionally contain the polymeric compounds known in the prior art as aids for an optimized cooling rate.
  • quench media previously described in the prior art is suitable for providing a durable passivation of the surface of a casting of aluminum and / or its alloys that is also capable of being directly coated with an organic overcoat.
  • the metallic castings solidified after liquid casting are usually mechanically reworked after deburring for deburring, so that in the prior art the conventional passivating pretreatment is carried out only after the cleaning and degreasing of the casting, so that the addition of inhibitors in the quenching medium is only for the Suppression of flash rust and only for the quenching of ferrous metals is made.
  • the addition of inhibitors to the quenching medium in the treatment of cast aluminum parts exclusively for the temporary corrosion protection up to the actual passivation after the mechanical processing of the casting is completely dispensed with because of the sufficient protective effect of the thermal oxide on the aluminum surface.
  • the object of the present invention is thus to improve the temporary corrosion protection by a durable passivation of castings made of aluminum and its alloys, without introducing additional treatment steps in existing processes from the production of the casting to the painting of the same with a decorative or corrosion-protective coating.
  • the solution of the object of the present invention is therefore to perform a passivating treatment of the surface of the casting during the quenching of the solidified after the liquid casting and removed from the molding aluminum casting, so even before a mechanical processing of the casting.
  • Pore formation is due to gases dissolved in the liquid aluminum and / or in the liquid alloy which form bubbles when the pressure of the dissolved gases is greater than the metallostatic pressure. Likewise, gases can cause blistering, which arise as reaction gases of the liquid metal with its molding or come from the evaporation of moisture from the molding during liquid casting.
  • Gas bubbles in die castings are primarily caused by entrained in the mold filling and vortexed air that rise during the solidification process in the form of body and near the surface, i. usually in the upper part, but also inside the casting, to be enclosed. Basically, the blistering or pore formation in metal casting process can not be completely avoided even with high technical effort. Rather, it is necessary to reduce the technical effort that directly determines the production costs as possible.
  • aluminum castings are also understood to mean castings made of aluminum alloys.
  • Preferred main alloying constituents of the aluminum casting alloy are Si, Mg, Cu and Zn.
  • those aluminum moldings are understood which have arisen from a shaping process by filling a shaped body with liquid metal under the influence of gravity, centrifugal force or under pressure and by solidification in the molded body.
  • the casting can be produced, for example, in the sand, mold, pressure and continuous casting.
  • the liquid metal is pressed under high pressure into divided metallic permanent molds.
  • high flow velocities occur in the die, wherein after completion of mold filling, the liquid metal is compressed according to the applied filling pressure.
  • one of the particular advantages of die casting is the very accurate contour reproduction of the molded part, so that especially thin-walled and dimensionally accurate molded parts are accessible.
  • the manufacturing process by means of shared permanent molds and the high contour accuracy in Pressure die casting inevitably means that the castings have to be deburred, ie mechanically reworked.
  • the present invention is particularly suitable for cast aluminum castings, as these have a burr at the mating surface of the moldings, which must be removed mechanically, so that any previous corrosion-protective passivation of the casting at these locations must be renewed. For this purpose, cleaning and degreasing of the casting to remove lubricants from the mechanical treatment is always necessary before any additional corrosion-protective treatment can take place.
  • a conventional passivation which takes place exclusively after deburring and after the cleaning and degreasing step, does not provide sufficient protection against corrosion, since the inner surface of the pores or bubbles in particular after the contact with the lubricant and the subsequent degreasing solution is only insufficiently wetted with the passivating treatment solution.
  • a passivating pretreatment or a passivation of the casting which already takes place before the cleaning and degreasing of the machined casting and in particular during the quenching of the cast aluminum after the liquid casting and removed from the molding, is then within the meaning of the present invention, if a at least temporary corrosion protection is effected by chemical conversion of the surface of the casting of aluminum.
  • the chemical conversion of the surface of the aluminum casting therefore involves the change in the chemical composition of the intermediate layer which separates the interior of the casting and the surrounding medium.
  • the chemical conversion may consist in particular in a conversion of the natural oxide layer into another essentially inorganic covering layer, wherein the inorganic covering layer is at least partially composed of metal cations of the conversion treatment solution.
  • This type of passivating treatment corresponds with it a typical conversion treatment such as occurs in the phosphating of aluminum surfaces.
  • passivating pretreatments are generally not covered by the present invention, which form outer layers, in particular crystalline outer layers with a layer coverage of more than 0.5 g / m 2 .
  • Such a conversion treatment in the sense of a passivating pretreatment is preferably used in the process according to the invention by quench baths with aqueous compositions containing at least 10 ppm, preferably at least 50 ppm, of water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo and / or W. achieved the respective elements.
  • the passivating pretreatment may consist in effecting, by contact with a composition containing organic polymers, an additional coating of the surface of the casting with a thin coating layer of less than 100 mg / m 2 of polymer layer support.
  • quench baths with aqueous compositions are provided for such a passivating pretreatment, containing as main active component water-soluble and / or water-dispersible organic polymers and / or copolymers which at least partially phosphonic acid and / or phosphoric acid groups and their esters.
  • the conversion of the surface of aluminum may alternatively be effected by chemisorption of surface-active compounds to form a monomolecular or multimolecular layer of a few nanometers thickness.
  • quench baths containing aqueous compositions containing at least one organophosphoric acid or organophosphonic acid having more than 3 carbon atoms are preferred for this purpose.
  • organophosphoric acids or organophosphonic acids disclosed in international application WO 200220873 are particularly preference is given here to the organophosphoric acids or organophosphonic acids disclosed in international application WO 200220873.
  • unbranched alkylphosphoric acids and alkylphosphonic acids having not less than 8 and not more than 14 carbon atoms and their salts and the corresponding ones are particularly suitable terminally selected from -P (O) (OH) 2 , -O-P (O) (OH) 2 , -OH, -COOH, -NH 2 and -NRH groups, wherein R is alkyl of less than 6 Carbon atoms, functionalized alkylphosphoric acids and alkylphosphonic acids and their salts.
  • the present invention therefore preferably relates to a method for passivating cast aluminum parts, in which the aluminum casting which has solidified after the liquid casting and is removed from the molding is transferred directly to a quench bath having an aqueous composition, characterized in that the aqueous composition has at least one of the following conditions: a ) -c): a) the composition contains at least a total of 10 ppm of water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo, and / or W, more preferably of the elements Ti and / or Zr, based on the respective ones Elements; b) the composition contains at least 0.01 g / l of water-soluble and / or water-dispersible organic polymers and / or organic copolymers which at least partially partially phosphonic acid and / or phosphoric acid groups and their esters have; c) the composition contains at least a total of 10 ppm of water-soluble organophosphoric acids and / or organophosphonic acids having more than
  • the aqueous composition of the quench bath in the process according to the invention already contains at least 10 ppm of water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo, and / or W with respect to the respective elements, then at least condition a) is fulfilled
  • fluorocomplexes In the presence of fluorocomplexes, the pickling effect of the aqueous composition on aluminum is increased, so that a complete conversion of the aluminum surface can be achieved even with short quenching times.
  • the total content of water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo and / or W based on the respective elements in the aqueous composition of the quenching bath is preferable not more than 50 g / l, more preferably not more than 10 g / l.
  • the aqueous composition of the quenching bath contains a certain proportion of water-soluble and / or water-dispersible organic polymers and / or organic copolymers having at least partially phosphonic acid and / or phosphoric acid groups and their esters
  • further organic polymers may be present in the aqueous composition of the quench bath, which positively influence the quenching characteristics of the aqueous treatment solution or are used as dispersing aids, but which do not contain phosphonic acid and / or phosphoric acid groups and their esters.
  • the water-soluble polymeric fractions intended for the dispersion are preferably composed of monomers which are selected from acrylic acid, methacrylic acid and / or maleic acid and the respective ester.
  • the preferred molecular weight of these water-soluble polymers is at least 1000 g / mol, and does not exceed 10,000 g / mol.
  • the total amount of organic polymers and / or organic copolymers in the aqueous composition of the quenching bath which on the one hand satisfies condition (b) and, on the other hand, is preferably additives of water-soluble polymers as quenching agents which do not contain phosphonic acid and / or phosphoric acid groups and their esters at not more than 50 g / l, preferably not more than 10 g / l. Higher levels can lead to a filming of these organic polymers on the surface of the casting, which in turn adversely affects the process of the invention optionally subsequent conversion treatment and / or coating with a organic topcoat can affect.
  • preferred are those aqueous compositions which, during the quenching process of the solidified casting, produce a polymeric passive layer with a layer coverage of less than 0.5 g / m 2 .
  • condition (c) which implies that the aqueous composition of the quench bath contains at least a total of 1 ppm of water-soluble organophosphoric acids and / or organophosphonic acids having more than 3 carbon atoms and salts thereof with respect to the element phosphorus
  • those methods are preferred according to the invention in which Content of water-soluble organophosphoric acids and / or organophosphonic acids based on the element phosphorus in the composition is not more than 1 g / l, preferably not more than 0.1 g / l.
  • the aqueous composition contains no other than alkyl and / or aralkylphosphonic acids as such, which satisfy the condition c).
  • the aqueous composition which satisfies at least the condition a) and thus contains water-soluble compounds of the elements Ti, Zr, Hf, Si, Mn, Mo and / or W
  • the aqueous composition additionally contains free fluoride ions in a concentration of not more than 500 ppm. This gives a uniform result in terms of inorganic conversion of the aluminum surface. Free fluoride ions are the unbound and not in the form of fluorocomplexes present proportion of fluoride ions.
  • This proportion can be determined potentiomethsch by means of ion-selective electrodes in the aqueous composition. Since free fluoride ions are able to completely dissolve the natural thermal oxide layer on the aluminum casting, their presence is indicative of passivation in the aqueous compositions containing only the Conditions b) and / or c) and thus cause a conversion of the surface by chemisorption of the respective active components on the oxidic surface, disadvantageous and not provided for the corresponding inventive method.
  • the aqueous composition in the process according to the invention additionally contain at least one surface-active substance which satisfies neither condition b) nor condition c).
  • Such surface-active substances promote wetting, in particular in the pores of the surface of the casting, and thus facilitate the formation of a passive layer.
  • the proportion of surface-active substances, in particular of the abovementioned ethoxylated fatty amines is preferably at least 0.1 g / l, but not more than 5 g / l.
  • the defogging bath and thus the aqueous composition are preferably additionally defoamers based on a fatty alcohol ethoxylate / propoxylate or an addition of an alkyl group having 4 to 8 carbon atoms end phenomenonver usen addition product of 7 to 12 moles of ethylene oxide to fatty alcohols having 8 to 18 carbon atoms added ,
  • the solidified casting which preferably has a temperature of at least 300 ° C., particularly preferably of at least 400 ° C., is quenched to temperatures of not more than 80 ° C. within a very short time in order to increase the specific crystallite structure of the solidified casting conserve and precipitates of, for example, alloying constituents prevent. Accordingly, temperatures of the quench bath and thus of the aqueous composition of not more than 80 ° C. are preferred, in particular temperatures of not more than 60 ° C., more preferably of not more than 40 ° C.
  • the process according to the invention is preferably carried out as a dipping process, in which the entire casting which has solidified after the liquid casting is immersed in the aqueous composition of the quenching bath which satisfies at least one of the abovementioned conditions a) -c).
  • a method for the corrosion-protective treatment of aluminum castings comprising the following method steps according to the invention: i) contacting the cast part, which has solidified after the liquid casting and dissolved out of the molded part, which has a temperature of more than 300 0 C, preferably more than 400 0 C, with an aqueous composition for quenching the casting, wherein the aqueous composition causes a passivation of the aluminum surface to form a passive layer, but which is neither crystalline nor a layer support of at least 0.5 g / m 2 has; ii) mechanical machining of the casting, which preferably does not constitute abrasive machining of the entire surface of the casting with a material removal of at least 5 kg / m 2 ; iii) contacting the casting with a cleaning and / or degreasing solution; iv) contacting a conventional passivating treatment solution; v) if necessary, coating with an organic topcoat
  • Mechanical processing ii) in the sense of the present invention is understood to mean those mechanical working steps which take place immediately after the quenching of i) the solidified casting made of aluminum and before conventional conversion treatment iv) in order to remedy casting defects with regard to the shape of the casting.
  • the mechanical processing preferably comprises exclusively the local processing such as the deburring of non-conforming areas.
  • Abrasive machining of the entire surface of the casting by means of abrasive media with a material removal of less than 5 kg / m 2 is preferred in the process according to the invention, since at higher removal rates, the passivation, which is brought about in the quench bath in step i), by abrasive machining of the entire Surface is largely removed and also new pores, which were previously enclosed close to the surface inside the casting, be exposed.
  • Such a method in which an abrasive treatment of the entire surface of the casting takes place with a removal of at least 5 kg / m 2 , has over a conventional passivation process in which during the quenching of the solidified casting in step i) a passivating pretreatment is omitted markedly reduced technical advantage with regard to the effectiveness of the temporary corrosion protection or possibly the effectiveness of the adhesion of the topcoat coating.
  • a conventional passivating treatment solution in step iii) also comprises all of the aforementioned passivating pretreatments, which occur even before the cleaning and degreasing of the machined casting and in particular during the quenching of the cast aluminum after the liquid casting and removed from the molding in step i), in particular those in which the aqueous composition for passivating treatment is formulated according to the aforementioned conditions a) -c).
  • series coating weights, in particular of crystalline layer coatings, of at least 0.5 g / m 2 are achieved, such as the crystalline zinc phosphating of aluminum.
  • the temperature of the aqueous composition of the quench bath in step i) is preferably not greater than 80 ° C., more preferably not greater than 60 ° C., and in particular not greater than 40 ° C.
  • the present invention comprises an aluminum casting which has been treated according to one of the previously described methods for passivating or anticorrosive treatment of aluminum castings and the use of such a casting in a method for applying further anticorrosive coatings and / or decorative overlays.
  • Table 1 shows examples according to the invention for the passivation of aluminum die cast (Al Si 7 wa) in the quench bath.
  • the corrosion results of the die castings treated according to the examples are taken from the CASS test, which is relevant to the material aluminum.
  • the quenching took place for a period of about 1 min within which the temperature of the solidified die cast part of about 500 0 C dropped to bath temperature, the temperature of the quench bath was about 24 0 C.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

L'invention concerne un procédé de passivation de pièces coulées en aluminium et/ou en alliages d'aluminium, selon lequel la pièce coulée solidifiée est mise dans un bain de trempe contenant une composition aqueuse de passivation. L'invention concerne également un procédé de traitement anticorrosion de pièces coulées en aluminium et/ou en alliages d'aluminium, selon lequel la pièce coulée durcie et extraite du moule, d'une température supérieure à 300°C, est mise en contact avec une composition aqueuse de passivation destinée au refroidissement rapide de ladite pièce coulée, puis, après un traitement mécanique de la pièce coulée et une opération subséquente de dégraissage et de nettoyage, la pièce coulée est soumise à un traitement de passivation avant d'être éventuellement recouverte d'une couche de finition organique. L'invention porte également sur une pièce coulée en aluminium et/ou en alliages d'aluminium, qui a été soumise à un traitement de passivation ou anticorrosion selon l'invention, ainsi que sur l'utilisation d'une telle pièce coulée dans un procédé visant à l'application de couches anticorrosion supplémentaires et/ou de couches de décoration.
EP09781449A 2008-09-23 2009-08-04 Passivation par refroidissement rapide de pièces en aluminium coulé sous pression Withdrawn EP2326736A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008048596A DE102008048596A1 (de) 2008-09-23 2008-09-23 Quenchpassivierung von Aluminiumdruckgussteilen
PCT/EP2009/060064 WO2010034553A1 (fr) 2008-09-23 2009-08-04 Passivation par refroidissement rapide de pièces en aluminium coulé sous pression

Publications (1)

Publication Number Publication Date
EP2326736A1 true EP2326736A1 (fr) 2011-06-01

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EP09781449A Withdrawn EP2326736A1 (fr) 2008-09-23 2009-08-04 Passivation par refroidissement rapide de pièces en aluminium coulé sous pression

Country Status (3)

Country Link
EP (1) EP2326736A1 (fr)
DE (1) DE102008048596A1 (fr)
WO (1) WO2010034553A1 (fr)

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CN114481112A (zh) * 2021-12-27 2022-05-13 湖北安登环保科技有限公司 一种无氟无锆铝合金钝化剂制备方法及使用工艺
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