EP1060290A1 - Solution aqueuse et procede pour phosphater des surfaces metalliques - Google Patents

Solution aqueuse et procede pour phosphater des surfaces metalliques

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Publication number
EP1060290A1
EP1060290A1 EP99911702A EP99911702A EP1060290A1 EP 1060290 A1 EP1060290 A1 EP 1060290A1 EP 99911702 A EP99911702 A EP 99911702A EP 99911702 A EP99911702 A EP 99911702A EP 1060290 A1 EP1060290 A1 EP 1060290A1
Authority
EP
European Patent Office
Prior art keywords
phosphating
aqueous
nitroguanidine
phosphate
aqueous solution
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
EP99911702A
Other languages
German (de)
English (en)
Other versions
EP1060290B1 (fr
Inventor
Peter Schubach
Joachim Heitbaum
Thomas Kolberg
Margit Fleischhacker-Jeworrek
Peter Jörns
Michael Deemer
Ralf Stickler
Jürgen SPECHT
Michael Lenhard
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.)
Chemetall GmbH
Original Assignee
Chemetall GmbH
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Filing date
Publication date
Application filed by Chemetall GmbH filed Critical Chemetall GmbH
Publication of EP1060290A1 publication Critical patent/EP1060290A1/fr
Application granted granted Critical
Publication of EP1060290B1 publication Critical patent/EP1060290B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/18—Orthophosphates containing manganese cations
    • C23C22/182—Orthophosphates containing manganese cations containing also zinc cations
    • 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C23C22/13—Orthophosphates containing zinc cations containing also nitrate or nitrite anions
    • 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/18—Orthophosphates containing manganese cations
    • C23C22/182—Orthophosphates containing manganese cations containing also zinc cations
    • C23C22/184—Orthophosphates containing manganese cations containing also zinc cations containing also nickel cations
    • 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
    • C23C22/07—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 phosphates
    • C23C22/08—Orthophosphates
    • C23C22/18—Orthophosphates containing manganese cations
    • C23C22/186—Orthophosphates containing manganese cations containing also copper cations
    • 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
    • C23C22/364—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 also manganese cations
    • C23C22/365—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 also manganese cations containing also zinc and nickel cations
    • 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
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/82—After-treatment
    • 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
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/20—Use of solutions containing silanes

Definitions

  • the invention relates to an aqueous, phosphate-containing solution for producing phosphate layers on metallic surfaces made of iron, steel, zinc, zinc alloys, aluminum or aluminum alloys.
  • the invention further relates to a method for phosphating metallic surfaces using an aqueous phosphating solution.
  • the invention has for its object to improve the aqueous, phosphate-containing solution and the method for phosphating, which were proposed in German patent application 196 34 685.1, so that the maximum edge length of the crystallites present in the phosphate layers produced is significantly ⁇ 15 microns that the phosphate layers produced have a layer weight of 2 to 4 g / l and that the phosphate layers produced are constant or uniform with regard to the layer weight and the edge length of the crystallites even during a longer operating time of the phosphating bath.
  • the essence of the invention is therefore that the solution proposed in the cited German patent application contains not only the accelerator nitroguanidine but also the accelerator hydroxylamine in a low concentration, the nitroguanidine concentration of the solution according to the invention compared to the nitroguanidine concentration proposed in the German patent application Solution was significantly lowered.
  • a solution which contains 0.1 to 1.5 g nitroguanidine / l and 0.1 to 0.4 g hydroxylamine / l is particularly advantageous and preferred.
  • optimal phosphating results are achieved.
  • EP-B 0 315 059 discloses a solution for phosphating iron surfaces, which has a zinc concentration of 0.2 to 2 g / 1 and which, as accelerators, contains hydroxylamine, hydroxylamine salts or hydroxylamine complexes contains, which give the solution a hydroxylamine concentration of 0.5 to 50 g / 1, preferably 1 to 10 g / 1, and although on the other hand from EP-B 0 633 950 a solution for the production of copper-containing phosphate layers on metal surfaces made of steel, galvanized steel, alloy-galvanized steel, aluminum and its alloys, which has a zinc concentration of 0.2 to 2 g / 1, a copper concentration of 0.5 to 25 mg / 1, a P 2 0 5 -Concentration of 5 to 30 g / 1, which contains hydroxylamine, hydroxylamine salts and hydroxylamine complexes as accelerators, which give the solution a hydroxylamine concentration of 0.5 to 5 g /
  • the solution according to the invention is also not disclosed or suggested to the person skilled in the art by the prior art cited above, because compared to the solution proposed in German patent application 196 34 685.1, the solution according to the invention only uses the lower nitroguanidine concentrations and additionally hydroxylamine and compared to the solutions which are known from the two European patents cited, the solution according to the invention uses hydroxylamine concentrations which are lower than the hydroxylamine concentrations disclosed in the cited prior art, wherein, in addition, the use of nitroguanidine as in both European patents cited Accelerator is not disclosed and that both European patents cited require the person skilled in the art to use high hydroxylamine concentrations, because according to the document EP-B 0 315 059 a hydroxylamine concentration of 1 b is 10 g / 1 as preferred and according to Example 1 of EP-B 0 633 950, a hydroxylamine concentration of 1.7 g / 1 is used.
  • the solution contains 0.3 to 3 g of Zn 2+ / l.
  • the solution is therefore particularly suitable for use in the context of low-zinc technology.
  • the solution additionally contains 0.5 to 20 g / N0 3 " / l, that the solution additionally contains 0.01 to 3 g Mn 2+ / l and / or 0.01 to 3 g Ni 2+ / l and / or 1 to 100 mg Cu 2+ / l and / or 0.01 to 3 g Co 2+ / l.
  • the copper content of 1 to 100 mg Cu + / 1 is responsible in particular for that high-quality phosphate layers are produced in the absence of nickel.
  • the solution contains 0.01 to 3 g F " / l and / or 0.05 to 3.5 g / 1 contains at least one complex fluoride.
  • the solution contains as complex fluoride (SiF s ) 2 ⁇ or (BF 4 ) W
  • the nitrate content according to the invention advantageously favors maintaining a constant layer weight.
  • the nitrate is added to the phosphating solution in the form of alkali metal nitrates and / or by the cations present in the system, for example as zinc nitrate and / or as HN0 3 . Since the nitrate-free aqueous solution also delivers good phosphating results, the known acceleration effect of the nitrate is in most cases of minor importance in the present case.
  • the metal ions Mn + , Ni 2+ , Cu 2+ and Co + added to the phosphating solution are built into the phosphate layer and improve paint adhesion and corrosion protection.
  • the free fluoride is added to the phosphating solution if metallic ones consisting of aluminum or aluminum alloys 6
  • the complex fluorides are added to the phosphating solution, especially to improve the phosphating result on galvanized surfaces.
  • the object underlying the invention is further achieved by the creation of a method for phosphating metallic surfaces, in which the metallic surfaces are cleaned, then with the aqueous, phosphate-containing phosphating solution for a period of 5 seconds to 10 minutes at a temperature of 15 to 70 ° C treated and finally rinsed with water.
  • This process can be carried out using simple technical means and is extremely reliable.
  • the phosphate layers produced by the process have a consistently good quality, which does not decrease even with a longer operating time of the phosphating bath.
  • the minimum phosphating time in the process according to the invention is less than in known low-zinc processes which work with the usual accelerators.
  • the minimum phosphating time is the time in which the surface is phosphated when closed. It has surprisingly been found that the process parameters which have proven advantageous in the process proposed in German patent application 196 34 685.1 can generally also be used in the process according to the invention.
  • the treatment of the metallic surfaces with the phosphating solution is carried out by spraying, dipping, splash-dipping or rolling.
  • These working techniques open up a very broad and diverse range of applications for the method according to the invention.
  • the metallic surfaces are treated after cleaning with an activating agent which contains a titanium-containing phosphate. This supports the formation of a closed, crystalline phosphate layer. It is also provided according to the invention that the metallic surfaces are aftertreated with a passivating agent after the rinsing process following the phosphating.
  • the passivating agents used can be both Cr-containing and Cr-free.
  • both mechanical impurities and adhering greases are removed from the surface to be phosphated.
  • the cleaning of the metallic surfaces belongs to the known state of the art and can advantageously be carried out with an aqueous alkaline cleaner. It is advisable to rinse the metal surfaces with water after cleaning. The cleaned or phosphated metal surfaces are rinsed either with tap water or with deionized water.
  • the nitroguanidine is introduced into the aqueous solution in the form of a stable, aqueous suspension.
  • the stable, aqueous suspension contains a layered silicate as stabilizer, the Layered Silicates [Mg s (Si 7/4 Al 0 / S ) O 20 (OH) 4 ] Na 0/6 x XH 2 0 or [(Mg 5 4 Li 0 6 ) Si 8 0 20 (OH, F) 4 ] Na 0 6 x XH 2 0 in an amount of 10 to 30 g / 1 nitroguanidine suspension, or it can be done in that the stable, aqueous suspension contains a stabilizer consisting of a polymeric sugar and polyethylene glycol, the Weight ratio of the polymeric sugar to polyethylene glycol is 1: 1 to 1: 3 and the stabilizer is used in an amount of 5 to 20 g / 1 nitroguanidine suspension.
  • nitroguanidine in the phosphating solution in the form of a stabilized suspension avoids the disadvantages which result from the fact that nitroguanidine is in the form of a powder and can only be distributed evenly in the phosphating solution in this form with difficulty.
  • the suspensions produced according to the invention can be easily pumped and are stable over 12 months, which means that the nitroguanidine does not settle even after a long time.
  • the suspensions are prepared by suspending the layered silicate or the organic stabilizer in deionized water and then stirring in the nitroguanidine.
  • the suspension is destroyed and the nitroguanidine is released and dissolved in a fine distribution.
  • the Zn 2+ : P 2 0 5 ratio relates to the total P 2 0 5 .
  • the determination of the total P 2 0 5 is based on the titration of the phosphoric acid and / or the primary phosphates from the equivalence point of the primary phosphate to the equivalence point of the secondary phosphate.
  • the S value indicates the ratio of free acid, calculated as free P 2 0 5 , to total P 2 0 5 .
  • the definitions and determination methods for the total -P 2 0 5 and the free P 2 0 5 are explained in detail in the publication by W. Rausch "The Phosphating of Metals", 1988, pages 289 to 304.
  • the following comparative and exemplary embodiments were carried out using the following process steps: a) The surfaces of metallic objects made of sheet steel were cleaned with a weakly alkaline cleaner (2% strength aqueous solution) for 6 minutes at 60 ° C. and in particular degreased. b) This was followed by rinsing with tap water for 0.5 minutes at room temperature. c) This was followed by activation with a liquid activating agent which contained a titanium phosphate for 0.5 minutes at 50 ° C. d) It was then phosphated by dipping at about 55 ° C. for 3 minutes. e) Finally, it was rinsed with tap water for 0.5 minutes at room temperature. f) The phosphated surfaces were dried in the oven at 80 ° C for 10 minutes.
  • the concentrate I contains, with the exception of hydroxylamine and Cu 2+ , all inorganic components of the
  • Concentrate II consists of a stabilized nitroguanidine suspension.
  • Concentrate III consists of an aqueous solution of hydroxylamine salts, hydroxylamine complexes or hydroxylamine. If a phosphating solution containing Cu 2 * is required, a concentrated Cu 2+ solution is used as concentrate IV. If metallic surfaces made of aluminum or aluminum alloys are to be phosphated, a solution is used as concentrate V which contains free fluoride-forming compounds.
  • the phosphating solution according to the invention is prepared by mixing the concentrates I to V required in each case with the simultaneous addition of water. If the phosphating bath is not used for a long time, the hydroxylamine is often partially decomposed. The resulting hydroxylamine losses are compensated for by adding concentrate III to the phosphating bath.
  • Aqueous solutions of hydroxylamine salts, hydroxylamine complexes or of hydroxylamine are used in a known manner as the hydroxylamine source.
  • NG nitroguanidine
  • g / 1 HA hydroxylamine
  • g / 1 Cu Cu 2+
  • mg / 1 Mn Mn 2+
  • the phosphating according to Comparative Example 1 was carried out with the exclusion of accelerators.
  • comparative example 2 only the accelerator hydroxylamine was present, while in comparative example 3, only the accelerator nitroguanidine was used.
  • Examples 4 to 9 were carried out in the presence of both accelerators, the concentration of both accelerators being in the range preferred according to the invention.
  • the table shows both the layer weights and the crystallite edge lengths which could be achieved when Examples 1 to 9 were carried out. These data show that in Comparative Example 1, which was carried out in the absence of the two accelerators according to the invention, a phosphate layer of insufficient quality resulted, since both the layer weight and the edge length of the crystallites of the phosphate layer are comparatively large. at 12 comparative examples 2 and 3 still tolerable layer weights and sufficiently small crystallite edge lengths were obtained, so that both phosphate layers can be regarded as quite useful. Exemplary embodiments 4 to 9 show that, according to the invention, both optimum layer weights and extraordinarily fine-crystalline phosphate layers could be produced.
  • Examples 4 to 9 thus demonstrate that the invention can be used to produce phosphate layers of very high quality, specifically when using very low concentrations of nitroguanidine and hydroxylamine in the phosphating bath.
  • the phosphate layers produced in accordance with Examples 1 to 9 were closed.
  • the edge lengths of the crystallites given in the table were determined on the basis of electron microscopic images of the individual phosphate layers.

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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)
  • Chemically Coating (AREA)
  • Catalysts (AREA)
EP99911702A 1998-02-27 1999-02-24 Solution aqueuse et procede pour phosphater des surfaces metalliques Expired - Lifetime EP1060290B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19808440A DE19808440C2 (de) 1998-02-27 1998-02-27 Wässrige Lösung und Verfahren zur Phosphatierung metallischer Oberflächen sowie eine Verwendung der Lösung und des Verfahrens
DE19808440 1998-02-27
PCT/EP1999/001186 WO1999043868A1 (fr) 1998-02-27 1999-02-24 Solution aqueuse et procede pour phosphater des surfaces metalliques

Publications (2)

Publication Number Publication Date
EP1060290A1 true EP1060290A1 (fr) 2000-12-20
EP1060290B1 EP1060290B1 (fr) 2002-09-18

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Family Applications (1)

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EP99911702A Expired - Lifetime EP1060290B1 (fr) 1998-02-27 1999-02-24 Solution aqueuse et procede pour phosphater des surfaces metalliques

Country Status (15)

Country Link
US (1) US6497771B1 (fr)
EP (1) EP1060290B1 (fr)
JP (1) JP2002505378A (fr)
KR (1) KR20010041417A (fr)
CN (1) CN1292041A (fr)
AT (1) ATE224466T1 (fr)
AU (1) AU740987B2 (fr)
BR (1) BR9909236A (fr)
CA (1) CA2325012A1 (fr)
DE (2) DE19808440C2 (fr)
PL (1) PL342623A1 (fr)
SI (1) SI20378A (fr)
SK (1) SK12352000A3 (fr)
TR (1) TR200002495T2 (fr)
WO (1) WO1999043868A1 (fr)

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JP4233565B2 (ja) 2002-07-10 2009-03-04 ヒェメタル ゲゼルシャフト ミット ベシュレンクテル ハフツング 金属表面を被覆する方法
US20040118483A1 (en) * 2002-12-24 2004-06-24 Michael Deemer Process and solution for providing a thin corrosion inhibiting coating on a metallic surface
US20040261752A1 (en) * 2003-06-26 2004-12-30 Wolfgang Rein Phosphatized and bushingless piston and connecting rod assembly having an internal gallery and profiled piston pin
US6923153B2 (en) 2003-06-26 2005-08-02 Mahle Technology, Inc. Piston and connecting rod assembly having phosphatized bushingless connecting rod and profiled piston pin
US7581315B2 (en) 2004-11-16 2009-09-01 Mahle Technology, Inc. Connecting rod assembly for an internal combustion engine and method of manufacturing same
US7516546B2 (en) * 2004-11-16 2009-04-14 Mahle Technology, Inc. Method of manufacturing a connecting rod assembly for an internal combustion engine
US8613137B2 (en) 2004-11-16 2013-12-24 Mahle International Gmbh Connecting rod lubrication recess
CN102953055B (zh) * 2012-11-07 2014-05-14 长沙沃尔金属表面技术有限公司 一种黑色磷化液及其使用方法
KR101968836B1 (ko) * 2017-09-26 2019-04-12 현대제철 주식회사 전기아연도금강판 및 이의 제조방법
BR112020015010A2 (pt) * 2018-02-19 2021-01-19 Chemetall Gmbh Método para pré-tratamento químico e fosfatação seletiva, composição de fosfatação de zinco, concentrado, construção de metal compósito, e, uso da construção de metal compósito

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AU740987B2 (en) 2001-11-22
DE59902751D1 (de) 2002-10-24
CA2325012A1 (fr) 1999-09-02
US6497771B1 (en) 2002-12-24
JP2002505378A (ja) 2002-02-19
EP1060290B1 (fr) 2002-09-18
SI20378A (sl) 2001-04-30
WO1999043868A1 (fr) 1999-09-02
BR9909236A (pt) 2000-11-14
CN1292041A (zh) 2001-04-18
PL342623A1 (en) 2001-06-18
SK12352000A3 (sk) 2001-05-10
ATE224466T1 (de) 2002-10-15
AU3029899A (en) 1999-09-15
TR200002495T2 (tr) 2000-12-21
DE19808440C2 (de) 2000-08-24
DE19808440A1 (de) 1999-09-09
KR20010041417A (ko) 2001-05-15

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