EP1090160A1 - Commande de poids de couche lors de la phosphatation d'une bande - Google Patents

Commande de poids de couche lors de la phosphatation d'une bande

Info

Publication number
EP1090160A1
EP1090160A1 EP99937820A EP99937820A EP1090160A1 EP 1090160 A1 EP1090160 A1 EP 1090160A1 EP 99937820 A EP99937820 A EP 99937820A EP 99937820 A EP99937820 A EP 99937820A EP 1090160 A1 EP1090160 A1 EP 1090160A1
Authority
EP
European Patent Office
Prior art keywords
phosphating
ions
range
phosphating solution
layer
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
EP99937820A
Other languages
German (de)
English (en)
Other versions
EP1090160B1 (fr
Inventor
Jörg Riesop
Franz-Gerd Ricke
Frank Panter
Dieter Geruhn
Hubertus Peters
Manfred Wessel
Andreas Klare
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
ThyssenKrupp Steel Europe AG
Original Assignee
Henkel AG and Co KGaA
ThyssenKrupp Stahl AG
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, ThyssenKrupp Stahl AG filed Critical Henkel AG and Co KGaA
Publication of EP1090160A1 publication Critical patent/EP1090160A1/fr
Application granted granted Critical
Publication of EP1090160B1 publication Critical patent/EP1090160B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • C23C22/12—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
    • C23C22/12—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
    • C23C22/18—Orthophosphates containing manganese cations
    • C23C22/188—Orthophosphates containing manganese cations containing also magnesium 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
    • C23C22/73—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

Definitions

  • the invention relates to a method for controlling the layer weight in the phosphating of steel strip galvanized on one or both sides.
  • the layer weights can be kept reliably in the desired range from about 1 to about 2 g / m, even when the belt speed and thus the phosphating time or the change in other phosphating parameters change.
  • steel strip is galvanized on one or both sides, this is understood to mean both electrolytically galvanized and hot-dip galvanized steel strip.
  • This also includes alloy-galvanized steel strips.
  • the zinc layer contains additional alloy components such as iron, nickel and / or aluminum.
  • layer weight is common in the field of phosphating metal surfaces.
  • layer weight or more detailed “phosphate layer weight”
  • the terms "layer coating” or "area-related mass” are also used. This is understood to mean the mass of the metal phosphate layer produced on the metal surface by the phosphating, based on a unit area. It is usually given in g / m 2 . It can be determined by weighing a phosphated metal sheet with a known surface, detaching the metal phosphate layer and weighing the metal sheet again. The mass of the metal phosphate layer based on m can be calculated from the determined weight difference, taking into account the surface of the metal sheet. To remove the metal phosphate layer, for example, a 0.5 wt .-% Use chromic acid solution. The method of determining the layer weight is described in more detail in the German standard DIN 50942.
  • the layer weight represents an essential parameter for checking the phosphating result. Depending on the intended use of the phosphated metal parts, layer weights are sought in different areas.
  • the present invention is preferably concerned with sheet metal used in automotive engineering. Layer weights of above 0.8 g / m, but at most about 4 g / m, are aimed for.
  • the layer weights should preferably be below 3 g / m 2 and in particular be about 1 to about 2 g / m 2 .
  • phosphating surfaces made of iron, steel, zinc and their alloys as well as aluminum and its alloys have long been state of the art.
  • the phosphating of the surfaces mentioned serves to increase the adhesive strength of paint layers and to improve corrosion protection.
  • the phosphating is carried out by immersing the metal surfaces in the phosphating solutions or by spraying the metal surfaces with the phosphating solutions. Combined methods are also known.
  • Shaped metal parts such as automobile bodies can be phosphated, but also metal strips in high-speed conveyor systems.
  • the present invention is concerned with such a band phosphating.
  • Belt phosphating differs from partial phosphating in that, because of the high belt speeds, the phosphating, i.e. H. the growth of a closed metal phosphate layer must take place within a short period of time, for example about 2 to about 20 seconds.
  • German patent application DE-A-196 39 596 tries to provide a phosphating process which, on the one hand, solves the problem of speck formation and, on the other hand, makes it possible to also use galvanized steel strips or the non-galvanized side of one-side galvanized steel strips with the short phosphating times customary in strip systems with a to provide a closed crystalline phosphate layer.
  • "Specks” are understood to be whitish corrosion spots on the metal surface that show a crater-like appearance in microscopic images. Such specks often occur on galvanized steel surfaces if the phosphating solution has too high levels of chloride ions and / or nitrate ions.
  • this task becomes solved by a method for phosphating steel strip or steel strip galvanized on one or both sides or galvanized with alloy by spray or dip treatment for a period of time in the range from 2 to 15 seconds with an acidic, zinc and manganese-containing phosphating solution with a temperature in the range from 40 to 70 ° C, characterized in that the phosphating solution 1 to 4 g / 1 zinc ions,
  • DE-A-197 40 953 describes a method for phosphating steel strip or steel strip galvanized on one or both sides or alloy galvanized by spray or dip treatment for a period in the range from 2 to 20
  • Phosphating solution with a temperature in the range of 50 to 70 ° C, characterized in that the phosphating solution is free of nitrate ions and that it
  • free acid and total acid are generally known in the field of phosphating. They are determined by titrating the acid bath sample with 0.1 normal sodium hydroxide solution and measuring its consumption. The consumption in ml is given as a score.
  • the number of free acids means the consumption in ml of 0.1 normal sodium hydroxide solution in order to titrate 10 ml of bath solution, which has been diluted to 50 ml with deionized water, up to a pH of 4.0 .
  • the total acid score indicates consumption in ml up to a pH of 8.2.
  • Various measures are known in the prior art for adjusting the layer weight to the desired range. For example, this can be done with otherwise identical bath parameters by changing the belt speed.
  • the phosphating bath parameters must be set so that they give layer weights in the desired range at the specified belt speed.
  • the belt speeds can fluctuate considerably, for example in the range between approximately 20 and approximately 180 m / min.
  • the following are known as possibilities for regulating the layer weight: change in the temperature of the phosphating bath, change in the free acid, the total acid and / or the concentration of the layer-forming ions.
  • these changes respond very slowly, so that it takes a considerable amount of time to obtain layer weights in the desired range. It is particularly problematic to adjust the layer weight by changing the bath composition. These changes can often only be undone with a considerable time delay. At least they are associated with an additional consumption of phosphating chemicals and thus with additional costs.
  • the invention accordingly relates to a method for controlling the layer weight in the phosphating of steel strip galvanized on one or both sides with a phosphating solution which contains 1 to 6 g / 1 zinc ions and 10 to 30 g / 1 phosphate ions, characterized in that in the phosphating solution a salary 6
  • Fe (II) ions in the range from 3 to 100 mg / 1.
  • This process is based on the surprising observation that, with the process parameters remaining the same, the more iron (II) ions the phosphating bath contains, the lower the layer weight. It was observed that in the case of layer weights in the introductory range with otherwise identical phosphate parameters, the layer weight is reduced by approximately 0.1 g / m 2 if the phosphating bath is between 3 and 20 mg / 1, in particular approximately 5 to approximately 10 mg / 1 iron (II) ions are added. The longer the treatment time, the less iron (II) is sufficient.
  • the preferred procedure is to prepare a stock solution of a soluble iron (II) salt with a known iron concentration and add it to the phosphating bath if necessary.
  • the soluble iron (II) salts used are preferably salts of anions which do not have a negative effect on the phosphating result and corrosion protection. Iron (II) sulfate is particularly suitable for this.
  • the process according to the invention therefore makes it possible to counteract the increase in the layer weight by reducing the belt speed by increasing the concentration of iron (II) ions in the phosphating bath by about 3 to about 20 mg / l, depending on the treatment time, in order to reduce it of the layer weight to reach 0.1 g / m.
  • contents of iron (II) ions in the range between approximately 3 to approximately 100 mg / 1, preferably between approximately 10 and approximately 100 mg / 1 and in particular between approximately 15 and approximately 55 mg / 1 belt speeds in the range of approximately are obtained 20 to about 180 m / min and resulting phosphating times of about 2 to about 15 seconds, reliable layer weights in the range between about 1 and about 2 g / m.
  • the process according to the invention is preferably operated in such a way that the phosphating solution is supplemented with supplementary solutions which contain no iron (II).
  • the iron (II) content of the phosphating bath decreases over time as a result of drag-out or air oxidation, so that the layer weights increase over time. This effect may be desirable as long as the layer weight is in the technically preferred range. An undesirable further increase can then be counteracted by adding the appropriate amount of iron (II) ions to the phosphating bath.
  • Phosphating solutions which contain ions of one or more other divalent metals in addition to zinc ions are currently used for the phosphating of galvanized steel strips.
  • phosphating baths are currently in use which additionally contain one or more of the following cations: 1 to 5 g / 1 manganese ions, 1 to 4 g / 1 magnesium ions, 0.8 to 4.5 g / 1 nickel ions.
  • the method according to the invention can also be applied to such baths.
  • the phosphating solutions contain alkali metal and / or ammonium cations in order to adjust the value of the free acid to the desired range.
  • Phosphating baths usually also contain so-called accelerators. These are substances that react with the hydrogen generated on the metal surface during the pickling reaction. This prevents a so-called polarization of the metal surface by covering it with hydrogen.
  • the accelerators improve the uniform covering of the metal surface with finely divided phosphate crystals, which usually have a size between approximately 1 and approximately 10 ⁇ m.
  • the process according to the invention presupposes that accelerators which oxidize iron (II) to iron (III) are dispensed with.
  • Hydroxylamine is particularly suitable as an accelerator which does not have an oxidizing effect on iron (II). Accordingly, the use of a phosphating solution which additionally contains about 0.1 to about 3 g / 1 hydroxylamine in free, ionic or bound form as accelerator is preferred for the process according to the invention.
  • Hydroxylamine can be used as a free base, as a hydroxylamine-releasing compound such as hydroxylamine complexes and ketoximes or aldoximes or in the form of hydroxylammonium salts. If free hydroxylamine is added to the phosphating bath or a phosphating bath concentrate, it will largely exist as a hydroxylammonium cation due to the acidic nature of these solutions. When used as a hydroxylammonium salt, the sulfates and the phosphates are particularly suitable. In the case of the phosphates, the acid salts are preferred due to the better solubility.
  • a combination of free hydroxylamine and hydroxylammonium sulfate can advantageously be used in order to take economic aspects into account on the one hand and on the other hand not to burden the phosphating baths with too much sulfate ions.
  • Hydroxylamine or its compounds are added to the phosphating solution in amounts such that the calculated concentration of the free hydroxylamine is between about 0.1 to about 3 g / 1, preferably between about 0.15 and about 1 g / 1.
  • the total phosphorus content of the phosphating bath is considered to be present in the form of phosphate ions P0 4 3 ' .
  • the known fact that the pH values of the phosphating baths in the range from about 2.0 to about 3.6, which are in the acidic region, only a very small part of the phosphate is actually in the form is ignored when calculating or determining the concentration the triple negatively charged anions are present.
  • the phosphate is present primarily as a single negatively charged dihydrogen phosphate anion, together with undisociated phosphoric acid and with smaller amounts of double negatively charged hydrogen phosphate anions.
  • a further preferred embodiment of the invention consists in using phosphating solutions which contain up to about 0.8 g / 1 fluoride in free or complex-bound form.
  • the preferred fluoride contents are in the range from 0.0 to about 0.5 g / 1, in particular in the range from about 0.1 to about 0.2 g / 1.
  • the phosphating solutions are generally prepared in the manner known to the person skilled in the art.
  • phosphate is introduced into the phosphating solutions in the form of phosphoric acid.
  • the cations are added in the form of acid-soluble compounds such as, for example, the carbonates, the oxides or the hydroxides of phosphoric acid, so that this is partially neutralized.
  • the further neutralization to the desired pH range is preferably carried out by adding sodium hydroxide or sodium carbonate.
  • Suitable sources of free fluoride anions are, for example, sodium or Potassium fluoride.
  • tetrafluoroborate or hexafluorosilicate can be used as complex fluorides.
  • phosphating solutions are preferably used which have a free acid content in the range from about 0.4 to about 4 points and a total acid content in the range from about 15 to about 45 points.
  • the terms "free acid” and “total acid” and their method of determination have already been explained above.
  • the free acid values are preferably between about 1.5 and about 3.5 and in particular between about 2.0 and about 3.0 points.
  • the total acid levels are preferably in the range of about 25 to about 35 points.
  • the temperature of the phosphating solution in the process according to the invention is preferably in the range from about 50 to about 70 ° C. and in particular between 53 and 65 ° C.
  • the steel strip galvanized on one or both sides is brought into contact with the phosphating solution for a period of time in the range from about 2 to about 30 seconds by spraying the phosphating solution onto the galvanized steel strip or by immersing the galvanized steel strip in the phosphating solution .
  • the spray treatment is technically easier to carry out and is therefore preferred. Treatment times between 3 and 15 seconds are particularly preferred.
  • the phosphating solution is rinsed off with water from the galvanized steel strip.
  • the process according to the invention assumes that iron (II) ions are not introduced into the phosphating solution in an uncontrolled manner. As already mentioned, supplementary solutions that do not contain iron (II) are therefore preferable. Furthermore, at The phosphating of steel strip, which is only galvanized on one side, prevents the non-galvanized steel side from coming into contact with the phosphating solution and iron (II) ions thereby getting into the phosphating solution through a pickling reaction. Accordingly, the process according to the invention is carried out in the case of phosphating single-sided galvanized steel strip in such a way that only the galvanized strip side is brought into contact with the phosphating solution. Appropriate technical measures such as, for example, covering the non-galvanized strip side prevent it from coming into contact with the phosphating solution.
  • the process according to the invention is preferably used to produce phosphate layers with layer weights in the range from 1 to 2 g / m 2.
  • the iron (II) ion content in the phosphating bath is adjusted so that layer weights of 1.5 ⁇ 0.3 g / m are obtained.
  • the iron (II) ion content can be checked using known analytical techniques and particularly simply by immersing corresponding commercially available measuring strips in the treatment solution.
  • the metal surface must be completely water wettable before applying the phosphating solution. This is usually the case in continuously operating conveyor systems. However, if the belt surface is oiled, this oil must be removed by a suitable cleaner before phosphating. The procedures for this are common in the art.
  • activation is usually carried out using activation agents known in the art. Solutions or suspensions are usually used which contain titanium phosphates and sodium phosphates. The activation is followed by the use of the phosphating process according to the invention, which is advantageously followed by a passivating rinse. An intermediate rinse with water usually takes place between phosphating and passivating rinsing. For a passivating rinse. treatment baths containing chromic acid widely spread.
  • the metal strips phosphated according to the invention can be provided directly with an organic coating. However, they can also be assembled in the initially unpainted state after cutting, shaping and joining to form components such as automobile bodies or household appliances. The associated forming processes are facilitated by the phosphate layer. If the corrosive stress on the finished components is low, as is the case with household appliances, for example, the devices assembled from the phosphated metal can be painted directly. For higher corrosion protection requirements, such as those made in automobile construction, it is advantageous to have a phosphating treatment again after assembling the bodies.
  • the method according to the invention for controlling the layer weight was tested in a belt system for the phosphating of galvanized steel on both sides.
  • the electrolytically galvanized metal strips were activated with an activation solution containing titanium phosphate (Fixodine R 950, Henkel KGaA, batch concentration 0.5% by weight) and phosphated under the conditions given in the table.
  • an activation solution containing titanium phosphate (Fixodine R 950, Henkel KGaA, batch concentration 0.5% by weight) and phosphated under the conditions given in the table.
  • the phosphating bath in this example had the following composition:

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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)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Organic Insulating Materials (AREA)
  • Absorbent Articles And Supports Therefor (AREA)
  • Adhesive Tapes (AREA)

Abstract

L'invention concerne un procédé de commande du poids de la couche lors de la phosphatation d'une bande d'acier galvanisée d'un ou des deux côtés à l'aide d'une solution de phosphatation contenant des ions de zinc de 1 à 6 g/l et des ions de phosphate de 10 à 30 g/l. Ce procédé est caractérisé en ce que la teneur en ions de Fe(II) de la solution de phosphatation est réglée entre 3 et 100 mg/l. Plus la teneur en Fe(II) est élevée, plus le poids de la couche est faible. Une modification de la teneur en Fe(II) de 3 à 20 mg/l entraîne une modification du poids de la couche d'environ 0,1 g/m2.
EP99937820A 1998-03-02 1999-02-20 Commande de poids de couche lors de la phosphatation d'une bande Expired - Lifetime EP1090160B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19808755 1998-03-02
DE19808755A DE19808755A1 (de) 1998-03-02 1998-03-02 Schichtgewichtsteuerung bei Bandphosphatierung
PCT/EP1999/001108 WO1999045171A1 (fr) 1998-03-02 1999-02-20 Commande de poids de couche lors de la phosphatation d'une bande

Publications (2)

Publication Number Publication Date
EP1090160A1 true EP1090160A1 (fr) 2001-04-11
EP1090160B1 EP1090160B1 (fr) 2003-05-07

Family

ID=7859391

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99937820A Expired - Lifetime EP1090160B1 (fr) 1998-03-02 1999-02-20 Commande de poids de couche lors de la phosphatation d'une bande

Country Status (8)

Country Link
US (1) US6461450B1 (fr)
EP (1) EP1090160B1 (fr)
JP (1) JP2002505383A (fr)
KR (1) KR20010074665A (fr)
AT (1) ATE239807T1 (fr)
AU (1) AU3253499A (fr)
DE (2) DE19808755A1 (fr)
WO (1) WO1999045171A1 (fr)

Cited By (1)

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DE102018202867A1 (de) * 2018-02-26 2019-08-29 Thyssenkrupp Ag Verfahren zur Anpassung, Homogenisierung und Aktivierung von Oberflächen mit dem Ziel verbesserter Oberflächeneigenschaften

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JP3872621B2 (ja) * 1999-11-05 2007-01-24 新日本製鐵株式会社 自動車車体用亜鉛系メッキ鋼板
JP2001295063A (ja) * 2000-04-10 2001-10-26 Nippon Parkerizing Co Ltd 非鉄金属材料およびめっき鋼板へのりん酸塩被膜の形成方法
RU2258765C2 (ru) * 2001-02-26 2005-08-20 Сумитомо Метал Индастриз, Лтд. Поверхностно-обработанный стальной материал, способ его получения и жидкость для химической конверсионной обработки
US8062435B2 (en) * 2001-06-18 2011-11-22 Henkel Kommanditgesellschaft Auf Aktien Phosphating operation
US7294210B2 (en) * 2001-12-13 2007-11-13 Henkel Kommanditgesellschaft Auf Aktien Use of substituted hydroxylamines in metal phosphating processes
JP5119864B2 (ja) * 2006-10-31 2013-01-16 Ｊｆｅスチール株式会社 リン酸塩処理亜鉛系めっき鋼板及びその製造方法

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DE59905477D1 (de) 2003-06-12
US6461450B1 (en) 2002-10-08
KR20010074665A (ko) 2001-08-08
EP1090160B1 (fr) 2003-05-07
DE19808755A1 (de) 1999-09-09
ATE239807T1 (de) 2003-05-15
AU3253499A (en) 1999-09-20
WO1999045171A1 (fr) 1999-09-10
JP2002505383A (ja) 2002-02-19

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