EP0765952B1 - Verfahren zur Vorbehandlung der metallischen Oberfläche eines Gegenstandes aus Stahl-Blech für die direkte Emaillierung - Google Patents

Verfahren zur Vorbehandlung der metallischen Oberfläche eines Gegenstandes aus Stahl-Blech für die direkte Emaillierung Download PDF

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Publication number
EP0765952B1
EP0765952B1 EP96401848A EP96401848A EP0765952B1 EP 0765952 B1 EP0765952 B1 EP 0765952B1 EP 96401848 A EP96401848 A EP 96401848A EP 96401848 A EP96401848 A EP 96401848A EP 0765952 B1 EP0765952 B1 EP 0765952B1
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EP
European Patent Office
Prior art keywords
sheet
pickling
phosphating
enamel
treatment
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Expired - Lifetime
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EP96401848A
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English (en)
French (fr)
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EP0765952A1 (de
Inventor
Louis Guillot
Vincent Cholet
Daniel Vonner
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Sollac SA
Original Assignee
Sollac SA
Lorraine de Laminage Continu SA SOLLAC
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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
    • C23C22/40—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 molybdates, tungstates or vanadates
    • C23C22/42—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 molybdates, tungstates or vanadates containing also phosphates
    • 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
    • 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
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D3/00—Chemical treatment of the metal surfaces prior to coating

Definitions

  • the invention relates to a surface preparation process. metallic of a sheet steel object for enameling.
  • the mass enamel layer serves as a bonding layer to the sheet.
  • the cover layer is the top layer.
  • a metal surface for direct enameling we know a first process in which the metal surface is scoured then the surface with a sulfate solution containing nickel as a cation diaper trainer; this surface treatment is also called “nickel plating"; pickling and surface treatment are generally carried out by immersion or by sprinkling.
  • Document FR-A-1237493 thus describes a direct enameling process "where only the finishing layer is necessary" (page 1, column 2, line 12) where the surface to be enameled is first pickled in citric acid medium or glycolic at a temperature above 71 ° C; before application of the enamel layer, chemical nickel plating is carried out suitable for depositing between 0.3 and 4 g / m 2 of nickel; as indicated on page 4, column 2, line 23, it may be advantageous to add a small proportion of phosphoric acid to the bath (pickling).
  • the document FR-A-2020356 also describes a method of surface preparation for enamelling in direct mode, in which one pickles at least 20 g / m2 (page 1, lines 11 to 15 - page 6, lines 20 and following) and then treating said surface in two stages: a first stage thin layer phosphating (page 6, lines 12 to 15) then a second nickel plating step; page 6, line 20 and following, we describe a electrolytic pickling process and, under the conditions described, also specifies that a removal of 20 g / m2 is achieved.
  • the disadvantage of this first process is that it requires pickling deep, corresponding to a removal of material greater than 15 g / m2 on the surface to be enameled, to obtain enamels with qualities satisfactory in terms of adhesion and surface appearance.
  • the necessary material removal is commonly of the order of 25 g / m2 of surface to be glazed.
  • This deep pickling is a drawback insofar as it generates very large volumes of sludge to be treated.
  • document FR 2 593 522 proposes to replace the pickling and sulphate treatment by phosphating with a solution essentially containing nickel as a layer-forming cation; but the adhesion of the enamel proved to be very insufficient in this case, and in any case less than that obtained in the case of the first process cited.
  • the treatment effluents then contain heavy metals, in particular molybdenum, and can be expensive to deal with.
  • the object of the invention is to obtain, on the metal surface of an object, made of sheet steel, a enamel with strong adhesion and good surface appearance by a preparation sheet metal generating less voluminous effluents and easier to treat.
  • the invention relates to a process for preparing the metal surface of a sheet steel object, for enameling in direct mode, in which it is stripped and then the said surface is treated, characterized by stripping said surface under conditions suitable for removing not more than 15 grams of steel per square meter of said surface and then treats the pickled surface in two stages, a first so-called “amorphous” phosphating treatment step suitable for forming a layer of at least 0.2 g / m2 on said surface, then a second so-called “nickel plating" treatment step.
  • Strong acids are preferably used for pickling, which reduces the pickling time.
  • a phosphate solution forming a layer for the amorphous phosphating treatment, therefore, a phosphate solution forming a layer; this treatment is known in itself, especially for the preparation of a sheet for stamping.
  • the nickel-plating treatment is known in itself for the preparation of a surface with direct enameling after a deep pickling and corresponds for example in the treatment of the first method of the prior art previously described.
  • the nickel-plating conditions to obtain a deposit of between 0.5 and 2.5 g / m2 on the surface to be glazed.
  • the surface treatment according to the invention which comprises two stages, one of amorphous phosphating, the other of nickel plating, finds that a light pickling is enough to obtain a reproducible an enamel that is both strongly adherent and has an appearance of satisfactory surface.
  • Light stripping means a stripping corresponding to a material removal of at most 15 g / m2, when the surface to be stripped is sheet steel.
  • the quantity of sludge to be treated is therefore limited, avoids the presence of heavy metals in the treatment effluents surface while also obtaining an enamel layer in direct mode adherent only by the first cited process of the prior art, namely a deep pickling followed by a single nickel plating treatment with a sulphate solution.
  • shaping for example by stamping, is deemed destroy the surface preparation for direct enameling, even form before surface preparation; because, a sheet which would be, in reverse order, pickled and then shaped (including oiling and degreasing) no longer has sufficient surface reactivity to make the surface treatment effective.
  • the invention also aims to simplify the method of manufacture of an enamelled sheet object.
  • the invention therefore also relates to a method of manufacture of an enameled sheet steel object in direct mode, which includes a shaping operation, a surface preparation according to the invention, and an enameling operation, characterized in that the shaping operation is carried out after pickling and after first stage of surface treatment called amorphous phosphating.
  • the etched and phosphated surface however retains a sufficient reactivity after shaping to make the treatment effective nickel plating and give the enamel good adhesion and good appearance of surface.
  • This new order of manufacturing operations also provides additional advantage in terms of shaping since, thanks to prior phosphating, the properties are significantly improved tribological of the surface, and therefore the lubrication between the sheet and the tools formatting.
  • an object is taken metallic to enamel.
  • This object is produced by shaping a sheet of sheet steel.
  • the sheet metal is scoured then a first operation is carried out amorphous phosphating surface treatment.
  • composition of the pickling bath is known in itself; for shorten the pickling time, preferably using base baths strong acid, for example sulfuric acid.
  • the pickling conditions are chosen so as to remove at most 15 g / m2 of steel (per side).
  • the amorphous phosphating bath is known in itself.
  • a phosphating solution and suitable application conditions so that the weight of the layer does not exceed not 2 g / m2 per side.
  • a suitable phosphating solution is chosen for obtain a layer based on amorphous sodium phosphate, calcium and of iron.
  • the phosphating solution used does not contain metals heavy and phosphating effluents do not contain either.
  • the second treatment is then carried out. of the preparation process according to the invention.
  • This treatment is of a conventional type of nickel plating with a solution containing nickel cations, known in itself for preparing a metallic surface with direct enameling.
  • the solution contains, for example, sulphate or phosphite anions.
  • the nickel-plating conditions are adapted from a in a manner known per se to obtain a deposit of 0.5 to 2.5 g / m2 at the surface of the object to be glazed.
  • the nickel-plating effluents are those usually found in upstream of the prior art direct enameling installations and do not pose no particular problem for their treatment; an advantage of the invention is that they do not contain heavy metals.
  • the object is coated with a single layer of enamel and covered in a manner known in itself.
  • Light stripping means a stripping corresponding to a material removal of at most 15 g / m2 if the surface of the object to be glazed is made of steel.
  • strong adhesion is meant adhesion at least comparable to that which we would obtain by preparing the surface of the object according to the first cited process of the prior art; this process essentially differs of that of the invention by a greater stripping and by the absence of the phosphating treatment.
  • a quantity of sludge is also generated. pickling much lower than that of the first process cited in the prior art; the quantity of sludge can in particular be reduced by 40%.
  • the effluents for treating surface does not contain heavy metals, unlike the third cited process of the prior art, using treatment solutions containing molybdenum.
  • the invention can also be implemented in the context of a process for manufacturing an object in enamelled sheet in direct mode.
  • the strip of sheet metal is stripped and then a first operation is carried out. amorphous phosphating surface treatment.
  • pickling and phosphating treatment are performed online after work hardening, at high speed, for example at speed of 30 m / min .; pickling time can be significantly reduced compared to the stripping times of art preparation processes anterior: for example 2 to 25 seconds compared to commonly more than five minutes in the prior art.
  • Pickling sludge and phosphating effluents can be treated in effluent treatment facilities provided elsewhere for treating effluents from rolling and work hardening.
  • the pickled and phosphated sheet can be wound and sent to the enamellers, who carry out the shaping and enameling directly after simple nickel plating.
  • the pickled and phosphated sheet can then be considered as a intermediate commercial product, primed for direct enameling.
  • the phosphating treatment provides a temporary protection against corrosion and prepares for shaping.
  • the procedure is so after shaping, before the second surface treatment nickel-plating type.
  • the sheet is oiled, it is shaped, in particular by stamping, and the part formed is degreased, for example in a alkaline solution.
  • the coefficient of friction of the treated sheet against the shaping tools is weaker than with a sheet not treated, which facilitates the shaping operation.
  • the shaped and nickel-plated sheet is now ready for direct enameling.
  • pickling can then be carried out continuously on the sheet metal strip directly downstream of the rolling, on large capacity industrial installations which benefit from widely dimensioned processing facilities effluents and sludge.
  • the amorphous phosphating treatment which is an integral part of preparation for enameling, facilitates shaping.
  • composition of solutions is indicated. treatment and deposits made on the surface of steel sheets; the analytical methods used to obtain these compositions are: chromatonion analysis, atomic absorption and plasma analysis inductively coupled for solution analyzes, as for analyzes of deposit which are carried out after redissolution.
  • the purpose of this example is to illustrate the first process cited in the art previous in which a deep stripping is carried out followed by a single nickel-plating treatment of the metal surface to be glazed.
  • the sheet to be enameled is a decarbonated steel sheet with a thickness of 1 mm, called SOLFER from SOLLAC.
  • the sheet is shaped, then degreased in a solution alkaline.
  • the sheet is then pickled by immersion for 6 to 11 minutes in an acid solution at approximately 70 ° C containing approximately 70 g / l of acid sulfuric.
  • the stripping time is adjusted to obtain a weight loss of the sheet from 20 to 40 g / m2 per side.
  • This weight loss is necessary to obtain the qualities adhesion and surface appearance of the enamel to be deposited.
  • This stripping generates sludge to be treated; the amount of sludge generated is proportional to the target weight loss.
  • the stripped surface is then treated by immersion for 3 to 6 minutes in a nickel-plating solution at around 70 ° C containing 11 g / l approximately nickel sulphate, the pH of which has been adjusted to approximately 2.8 by addition of sulfuric acid.
  • the nickel plating time is adjusted to obtain a nickel plating between 0.5 and 2.5 g / m2 per side.
  • the coated surface is then coated with enamel.
  • the enamel is then baked under specific conditions of its composition, here about 3 minutes at about 820 ° c.
  • the adhesion of the enamel layer to the steel sheet substrate is evaluated. according to standard EN 10209, which defines a scale of five ratings, of the value 1 for excellent adhesion to value 5 for poor adhesion grip.
  • the skilled person assesses the surface quality in a known manner in itself, in particular by visually checking the absence of defects such as bites, broths, nail blemishes.
  • the enamel obtained has a level of adhesion of 1 and an aspect of surface qualified as good.
  • the purpose of this example is to illustrate the third process cited in the art previous in which one carries out a light stripping followed by a single treatment of the metal surface to be glazed with a solution of phosphating containing nickel and molybdenum.
  • the sheet is then pickled by immersion for 4 to 12 minutes in an acid solution at approximately 65 ° C containing 25 g / l of sulfuric acid about.
  • the stripping time is adjusted to obtain a weight loss of the sheet from 5 to 15 g / m2 per side.
  • the weight loss on stripping can be about 50% lower than that of Comparative Example 1 and the quantity of sludge generated by pickling is reduced in the same proportions.
  • the stripped surface is then treated by immersion for 6 to 12 minutes in a phosphate solution at around 60 ° C.
  • the phosphating solution is commercially available under the name VP 10091 of the company CHEMETALL.
  • the treatment time is adjusted to obtain a deposit of between 1 and 1.5 g / m2 per side.
  • the phosphating solution here contains heavy metals, in particular molybdenum, and generates effluents which can be expensive to deal with.
  • the deposit obtained typically contains the following elements: P2O5: 0.1 to 0.2 g / m2 / side - Na: 0.05 to 0.1 g / m2 / side - Ni: 0.05 to 0.1 g / m2 / side - Mo: 0.05 to 0.1 g / m2 / side - Ca: 0.05 to 0.1 g / m2 / side.
  • adhesion 3 - surface appearance: "good”.
  • this process does not allow achieve the same level of adhesion as the first process cited in the art previous (cf. comparative example 1).
  • the purpose of this example is to illustrate the process for preparing surface according to the invention.
  • the sheet is then pickled by immersion for 1.5 to 4.5 minutes in an acid solution at around 70 ° C containing 70 g / l of sulfuric acid about.
  • the stripping time is adjusted to obtain a weight loss of the sheet from 5 to 15 g / m2 per side, with the same advantage in terms of amount of sludge generated as in Comparative Example 2.
  • the stripped surface is then treated by immersion for 0.5 to 6 minutes in a phosphate solution at around 60 ° C.
  • the phosphating solution is commercially available under the name Bonderite 901 from PARKER.
  • This solution mainly contains the following elements: P205: 5 to 15 g / l - sodium: 10 to 20 g / l - nitrates (expressed as NO3-): 0 to 4 g / l - calcium: 5 to 20 g / l - and, for the elements Ni, Mo, Si, Fe, SO4, F: ⁇ 0.05 g / l.
  • the treatment time is adjusted to obtain a deposit of between 0.2 and 2 g / m2 per side.
  • the deposit obtained typically has the following elements: P2O5: 0.02 to 0.5 g / m2 / side - Na: 0.02 to 0.1 g / m2 / side - Ca: 0.2 to 0.5 g / m2 / side; nickel and molybdenum contents are not measurable and are less than 0.005 g / m2 / side.
  • the phosphated surface is then treated by immersion for 3 to 6 minutes in a nickel-plating solution as in the comparative example # 1.
  • adhesion 1 - surface appearance: "good”.
  • the level of grip is comparable to that of the example Comparative 1, that is to say that obtained with the first process mentioned of the prior art.
  • the purpose of this example is to illustrate the process of manufacturing an object enamelled sheet according to the invention, in which it is shaped after pickling, in particular after the phosphating treatment and before nickel plating treatment.
  • the sheet is then pickled by immersion for 5 to 15 seconds in an acid solution at around 100 ° C containing 750 g / l of acid sulfuric approximately.
  • the stripping time is adjusted to obtain a weight loss of the sheet from 5 to 15 g / m2 per side, with the same advantage in terms of amount of sludge generated as in Comparative Example 2.
  • the etched surface is then treated by immersion for 5 to 25 seconds in the same phosphating solution as in Example 1, at 60 ° C approximately.
  • the time of phosphating to obtain a deposit of between 0.2 and 2 g / m2 / side having the same composition approximately.
  • the next step is to shape of the phosphated sheet to form an object, according to a sequence classic including oiling the sheet, shaping properly talk and alkaline degreasing.
  • the implementation shape is facilitated by the preliminary phosphating treatment: indeed observes a decrease in the coefficient of friction compared to the one we would observe with the same oil on the same sheet, raw or straight out of pickling.
  • the metal surface of the object is then treated by immersion for 3 to 6 minutes in a nickel-plating solution as in Comparative Example 1.
  • adhesion 1 - surface appearance: "good”.
  • the level of adhesion and the surface appearance are comparable to those of example 1, which indicates that the shaping did not deteriorate the surface reactivity obtained during pickling, although carried out after pickling.
  • Example 1 the advantages already mentioned of Example 1 are added to the possibility of carrying out the first stages of surface preparation, at know pickling and phosphating, on large industrial lines flow, in particular directly at the rolling outlet, more precisely hardening.
  • the shaping is also facilitated.
  • the purpose of this example is to illustrate, in the process for preparing surface according to the invention, the importance of the phosphating step amorphous to obtain good adhesion, when not prior to a light stripping of not more than 15 g / m2 / side approximately.
  • the curve in Figure 1 represents the adhesion results obtained for the two series of samples (on the ordinate: 1 for a very good adhesion, 5 for poor adhesion) depending on the amount of material removed during stripping (on the abscissa: 0 to 25 g / m2 / face).
  • the curve marked by squares - "phosphated” - corresponds to samples prepared according to the invention
  • the curve marked with diamonds - "not phosphated” - corresponds to samples prepared according to the prior art with simple nickel plating after pickling.
  • FIG. 1 clearly shows that appreciable differences in adhesion between the two preparation processes surface, as soon as the pickling is less than or equal to 20 g / m2 / face, especially when it is at most 15 g / m2 / side.
  • Figure 1 also shows that to obtain adhesion sufficient enamel layer when proceeding according to the invention, it it is advisable that the pre-stripping is preferably greater than or equal to 5 g / m2 / face: the level of adhesion is then 3; to get the same level of adhesion by proceeding without amorphous phosphating, it would be necessary strip the surface at least at the level of 15 g / m2 / face.
  • the purpose of this example is to show that the etched surface then phosphated retains sufficient reactivity after shaping make a direct nickel-plating treatment effective and obtain good adhesion of the enamel layer.
  • shaping a sheet consists of oiling it, deform, in particular by stamping, finally to degrease it.
  • Unprocessed steel is called untreated raw steel.
  • Protective oil is an oil usually used for the temporary corrosion protection, especially for the storage of sheets.
  • Stamping oil is an oil usually used for stamping operations, adapted to improve properties tribological of a sheet surface.
  • the sample to be measured is clamped in a blank greenhouse with a predetermined clamping force F S.
  • the tribological properties are characterized by then measuring the maximum drawing force F d of the sheet in the blank holder.
  • This maximum drawing force F d is obviously proportional to the clamping force F s .
  • Maintaining surface reactivity in the event of friction is illustrated following the example.
  • the "rubbed" areas are areas where the surface has been substantially modified by friction on the stamping tool, where therefore the reactivity of surface may have been degraded.
  • non-rubbed areas are areas that do not appear not have undergone any particular friction and which have retained the appearance that they had before shaping.
  • the shaping therefore does not degrade the surface reactivity, which allows, according to the invention, to nickel directly after shaping, without repeating stripping.

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  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • ing And Chemical Polishing (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (3)

  1. Verfahren zur Vorbereitung einer Metalloberfläche eines Gegenstands aus Stahlblech auf die Direktemaillierung, nach dem die Oberfläche zunächst gebeizt und dann behandelt wird, dadurch
    gekennzeichnet, dass
    die Oberfläche unter solchen Bedingungen gebeizt wird, dass maximal 15 Gramm Stahl pro Quadratmeter der Oberfläche abgetragen wird,
    die gebeizte Oberfläche in zwei Stufen behandelt wird, in einem ersten Schritt durch ein sogenanntes "amorphes" Phosphatieren derart, dass eine Schicht von wenigstens 0,2 g/m2 auf der Oberfläche gebildet wird, dann in einem zweiten Schritt die sogenannte Vernickelung" stattfindet.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass die Vernickelungsbedingungen so eingestellt sind, dass eine Abscheidung von zwischen 0,5 und 2,5 g/m2 auf die Oberfläche des zu emaillierenden Gegenstands erzielt wird.
  3. Verfahren zur Herstellung eines Gegenstands aus direktemailliertem Stahlblech, das einen Formgebungsvorgang, eine Oberflächenvorbehandlung gemäß dem Verfahren nach einem der vorangehenden Ansprüche, und einen Emailliervorgang umfasst, dadurch gekennzeichnet, dass der Formgebungsvorgang nach dem Beizen und nach der ersten Stufe der Oberflächenbehandlung, nämlich dem sogenannten amorphen Phosphatieren, durchgeführt wird.
EP96401848A 1995-09-28 1996-08-29 Verfahren zur Vorbehandlung der metallischen Oberfläche eines Gegenstandes aus Stahl-Blech für die direkte Emaillierung Expired - Lifetime EP0765952B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9511376A FR2739396B1 (fr) 1995-09-28 1995-09-28 Procede de preparation de la surface metallique d'un objet, notamment en tole d'acier, pour emaillage en mode direct
FR9511376 1995-09-28

Publications (2)

Publication Number Publication Date
EP0765952A1 EP0765952A1 (de) 1997-04-02
EP0765952B1 true EP0765952B1 (de) 2001-07-18

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EP96401848A Expired - Lifetime EP0765952B1 (de) 1995-09-28 1996-08-29 Verfahren zur Vorbehandlung der metallischen Oberfläche eines Gegenstandes aus Stahl-Blech für die direkte Emaillierung

Country Status (8)

Country Link
US (1) US5766374A (de)
EP (1) EP0765952B1 (de)
JP (1) JPH09111474A (de)
AT (1) ATE203285T1 (de)
CA (1) CA2186327A1 (de)
DE (1) DE69613923T2 (de)
ES (1) ES2158261T3 (de)
FR (1) FR2739396B1 (de)

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Publication number Priority date Publication date Assignee Title
FR2761082B1 (fr) * 1997-03-21 1999-04-30 Lorraine Laminage Procede de preparation d'un objet en tole d'acier emaille en mode direct
US7514153B1 (en) 2005-03-03 2009-04-07 The United States Of America As Represented By The Secretary Of The Navy Method for deposition of steel protective coating
CN109735853A (zh) * 2019-02-15 2019-05-10 昆山正通铭金属有限公司 卷线的酸洗工艺
DE102021201881A1 (de) * 2021-02-26 2022-09-01 BSH Hausgeräte GmbH Verfahren zum herstellen eines emaillierten stahlbauteils, emailliertes stahlbauteil, sowie verwendung davon

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ATE203285T1 (de) 2001-08-15
DE69613923D1 (de) 2001-08-23
CA2186327A1 (fr) 1997-03-29
FR2739396B1 (fr) 1997-10-24
EP0765952A1 (de) 1997-04-02
JPH09111474A (ja) 1997-04-28
US5766374A (en) 1998-06-16
FR2739396A1 (fr) 1997-04-04
ES2158261T3 (es) 2001-09-01
DE69613923T2 (de) 2001-11-22

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