EP2851452A1 - Anorganische Karbonat- basierende Konversionssschicht auf verzinktem Stahl - Google Patents

Anorganische Karbonat- basierende Konversionssschicht auf verzinktem Stahl Download PDF

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Publication number
EP2851452A1
EP2851452A1 EP13004572.7A EP13004572A EP2851452A1 EP 2851452 A1 EP2851452 A1 EP 2851452A1 EP 13004572 A EP13004572 A EP 13004572A EP 2851452 A1 EP2851452 A1 EP 2851452A1
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EP
European Patent Office
Prior art keywords
alkali metal
carbonate
suspension
steel sheet
supplier
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EP13004572.7A
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German (de)
English (en)
French (fr)
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EP2851452B1 (de
Inventor
Achim Losch
Jahn Meinrad
Frank Beier
Wibke Geist
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Fuchs SE
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Fuchs Europe Schmierstoffe GmbH and Co KG
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Application filed by Fuchs Europe Schmierstoffe GmbH and Co KG filed Critical Fuchs Europe Schmierstoffe GmbH and Co KG
Priority to ES13004572T priority Critical patent/ES2734456T3/es
Priority to PL13004572T priority patent/PL2851452T3/pl
Priority to EP13004572.7A priority patent/EP2851452B1/de
Priority to PCT/EP2014/002550 priority patent/WO2015039762A1/de
Publication of EP2851452A1 publication Critical patent/EP2851452A1/de
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    • 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
    • C23C22/74—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 for obtaining burned-in conversion coatings
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/60—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH greater than 8
    • 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
    • C23C22/68—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 solutions with pH between 6 and 8
    • 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
    • C23C22/83—Chemical after-treatment

Definitions

  • the present invention relates to a galvanized steel sheet having an inorganic functional layer and a method for producing the coated galvanized steel sheet. Furthermore, the invention relates to the use of a treatment solution for producing the functional layer and the use of the steel sheet for the production of motor vehicle components.
  • Electrolytically galvanized and hot-dip galvanized sheet steel has been established from the mid-1980s until today as an essential pillar of corrosion protection for high-quality car bodies.
  • Zinc-protected surfaces today ensure such high corrosion resistance that the useful life of the entire vehicle is no longer decisively limited by corrosion.
  • Electrolytically galvanized steel has been used for years in the automotive body shop.
  • the surface finish is applied before galvanizing ("temper rolling").
  • the softer zinc layer is subsequently uniformly deposited by electrolysis on the hard base metal.
  • the elo-galvanized strip can be phosphated.
  • Vorphosphatierung acts as a solid lubricant, reduces friction and prevents welding of the zinc on the tool.
  • Prelube oils are used for pre-phosphated sheet metal. Ribbons and sinkers are often washed with low viscosity Prelube oils. A relubrication with drawing oils is only exceptionally necessary.
  • Another possibility for improving the formability is the coating with dry lubricant (Drylube, Hotmelt) instead of the Prelubeöle.
  • Release layers or tribo layers applied to the surface of galvanized steel must be compatible with the raw building adhesives used for automotive use.
  • WO 2005/071140 A1 the use of an aqueous treating solution containing sulfate ions in a concentration of at least 0.01 mol / l is known to treat the surface of a galvanized steel sheet to reduce damage to the coating during forming and for temporarily improved corrosion protection.
  • ArcelorMittal has developed such a tribo coating for fire zinc plates and launched it under the name "NIT". This layer is characterized by a very good friction reduction with good adhesive adhesion.
  • electrolytically galvanized sheet has been proven in addition to oiling a tri-cation tape phosphating. This is similar to the later applied in the Lackierline tri-cation phosphating.
  • DE 102008016050 A1 describes a primer for forming a forming layer, metal substrates coated with this primer and the use of the primer and the coated substrates.
  • the primers contain binders, additives, anticorrosive pigments, crosslinking agents and solvents. Branched polyester resins or other resins may be used as the binder, and anticorrosive pigments may be calcium modified silica, zinc phosphates, aluminum phosphates, aluminum triphosphates, silica-magnesium pigments and mixtures.
  • WO 2004/050808 A1 discloses a lubricant coated sheet metal having improved forming properties.
  • the coating lubricant is a corrosion protection oil, a so-called Prelube oil and / or a dry lubricant (Drylube, Dry Film Lubricant), wherein the metal sheet is a layer which is formed by applying a solution containing an organic phosphoric acid ester on the surface of the sheet.
  • a solution containing the organic phosphoric acid ester is applied to the top and / or bottom of the sheet and then the lubricant is applied to the sheet thus coated.
  • the solution can be applied by dipping, spraying, brushing or knife coating.
  • insufficient process compatibility in automotive engineering still limits the use.
  • the present invention Based on this prior art, the present invention, the object of the time-economic and in existing manufacturing processes, especially in automotive integrable production of a galvanized steel sheet with a functional layer to allow in terms of formability in comparison to only oiled surfaces, especially at high Contact pressures and high temperatures, is significantly improved, and can be economically applied on a large scale and is safe in terms of environment, health and safety.
  • Another object is to provide the galvanized steel sheet with functional layer, which is significantly improved in terms of formability compared to only oiled surfaces, especially at high contact pressures and high temperatures.
  • the functional layer should be insoluble or compatible with subsequently sprayed on lubricating oil.
  • the functional layer should also show a good adhesion of structural adhesive and suitable for body pretreatment (phosphating and phosphate-free process) and KTL-compatible.
  • Claim 12 discloses the use of the coated galvanized steel sheet in automobile construction.
  • claim 13 discloses the use of a solution or suspension to produce the inorganic functional layer on galvanized steel.
  • a method according to the invention for the time-economic production of a galvanized steel sheet having an inorganic functional layer on the surface forming a Umformanges slaughter or part of a Umformologis slaughter begins with the preparation of an aqueous, silane-free (silane-free) solution or suspension containing at least one carbonate Supplier or at least one carbonate supplier and at least one hydroxide supplier.
  • carbonate or “hydroxide supplier” refers to salts which are at least partially soluble in aqueous medium and dissociate, so that the desired zinc salts are formed on the galvanized surface by chemical reaction in the aqueous treatment solution or suspension become.
  • the carbonate supplier (s) are selected from ammonium bicarbonate, ammonium carbonate, alkali metal bicarbonates, alkali metal carbonates, and alkali metal carboxylates
  • the hydroxide source (s) are selected from alkali metal hydroxides, alkali metal oxides, alkali metal alkoxides, and magnesium hydroxide or magnesium oxide.
  • an additional hydroxide supplier can advantageously be dispensed with if the carbonate supplier goes into solution with the formation of hydroxide ions in an aqueous medium, as described, for example, in US Pat. B. with alkali metal bicarbonates and alkali metal carbonates is the case.
  • a concentration of the carbonate supplier (s) required in the solution or suspension to form the conversion layer is in a range from 1 to 5% by weight, preferably from 3 to 5% by weight.
  • the pH of the aqueous solution or suspension is in the range from 7 to 13, preferably from 8 to 12. It has been found that a pH of (9 ⁇ 0.5) leads to particularly suitable conversion layers. Depending on the type of carbonate or hydroxide suppliers selected, the pH of the treatment solution or suspension may already be within the stated range; however, if desired or required, addition of sodium hydroxide and / or potassium hydroxide may be made to adjust the pH.
  • the aqueous solution or suspension is applied to at least one side of the galvanized steel sheet and thus a wet film is produced with a thickness of 1 to 20 microns, so that at the surface a chemical reaction of the metallic coating with the at least partially dissolved in the aqueous medium and Dissociated carbonate suppliers or hydroxide suppliers to form zinc salts takes place.
  • a conversion layer of zinc salts which are at least partially carbonates, is then obtained as the inorganic functional layer.
  • the layer weight of the dry substance after drying of the wet film is advantageously in a range from 25 to 200 mg / m 2 surface, preferably from 40 to 90 mg / m 2 and is thus suitable for the desired further processing.
  • a deposited dry matter of 40 to 90 mg / m 2 surface is obtained, which converts to hydrozincite.
  • the coating weight of the conversion layer is in a range of 190 to 340 mg / m 2 and thus has a favorable and suitable strength for the intended purpose.
  • the hot-dip galvanized or elo-galvanized steel sheets with the functional layer can be economically produced with a small amount of time and equipment.
  • This treatment solution or suspension advantageously contains neither heavy metals nor organic compounds or solvents.
  • alkaline Solutions related risks are known and can be managed well; necessary protective measures against chemical burns are limited.
  • this conversion layer is oil resistant and soluble only in acids. The conversion layer shows good adhesion of raw building adhesives and is suitable for car body pretreatment and KTL-compatible.
  • any alkali element can generally be used as a cation of the carbonate and hydroxide suppliers, but mainly for cost and availability reasons, sodium and / or potassium will preferably be used.
  • Particularly preferred as carbonate suppliers are sodium and / or potassium bicarbonate and / or carbonate and used as hydroxide suppliers sodium or potassium hydroxide.
  • a treatment solution or suspension with these components achieves conversion layers with an optimum combination of friction behavior and bondability.
  • the application of the aqueous solution or suspension to the galvanized steel sheet can generally be done by spraying without squeezing or jetting and stripping with non-driven squeeze rolls.
  • the aqueous solution or suspension by rolling continuously applied to a strip of galvanized sheet steel.
  • a roller coater which usually works per coating side with two or three rollers (scoop roller, application roller and possibly regulating roller), wherein the tape is deflected at the counter-pressure roller.
  • the aqueous solution or suspension can be rolled up in a time-economical manner by means of two squeeze rolls, between which the hot-dip galvanized steel sheet or steel strip is guided, in a simple and thus preferred manner.
  • the aqueous solution or suspension is sprayed in excess onto the squeezing rollers arranged on both sides of the galvanized steel sheet and excess solution or suspension, which drips off the sheet or the rollers, is collected and guided into a feed tank.
  • the squeeze rolls are pressurized against the surfaces of the galvanized steel sheet, thereby stripping the aqueous solution or suspension onto the surfaces of the galvanized steel sheet.
  • the thickness of the wet film is set in a range of 1 to 20 ⁇ m by selecting the setting pressure, a hardness of rubberizing the squeezing rollers, a speed of the squeezing rollers and a speed of the steel sheet and thus a relative speed of the squeezing rollers to the steel sheet.
  • a corrosion protection oil and / or a Prelubeöls or a dry lubricant carried on the conversion layer, so that a lubricating oil layer having a basis weight of 0.2 to 3.0 g / m 2 is obtained.
  • An inventive hot-dip galvanized steel sheet has on the surface an inorganic functional layer which forms a forming auxiliary layer or is part of a forming auxiliary layer.
  • the inorganic functional layer according to the invention is based on an alternative chemical basis. It is a conversion layer formed from zinc and zinc salts, of which at least a part of the Carbonates heard.
  • the conversion layer is obtained by applying a treatment medium to the galvanized sheet steel surface, which is an aqueous solution or suspension free of hydrogen sulphide, which contains at least one carbonate supplier, but preferably at least one carbonate supplier and additionally at least one hydroxide supplier.
  • the zinc salts of the conversion layer may further include zinc hydroxides and zinc oxides; the conversion layer can therefore preferably have a hydrozincite-like mineral structure.
  • the conversion layer with a method according to the invention can be displayed time-economically.
  • the layer weight of the dry substance which leads to the formation of the conversion layer is from 25 to 200 mg / m 2 surface, preferably from 40 to 90 mg / m 2 , a sufficiently good formability is ensured.
  • a tracer system can be provided in the conversion layer, which can be detected by X-ray fluorescence analysis and is selected from potassium, phosphorus, silicon or even tin or titanium compounds.
  • the Umformins slaughter the hot-dip galvanized steel sheet also has a lubricating oil layer, which is applied to the conversion layer, which in itself shows only limited anti-corrosion and lubricating effect.
  • This lubricating oil layer has a basis weight of 0.2 to 3.0 g / m 2 , typically 1.0 -1.5 g / m 2 , and thus meets the current delivery instructions for oiled steel strip.
  • the conversion layer is compatible with subsequently sprayed on corrosion protection oil or Prelube oil or dry lubricants and their suitability for subsequent process steps such as adhesive bonding or removability in automotive shell construction does not affect.
  • the application of corrosion protection or prelube oil or dry lubricant is for corrosion protection and lubrication necessary during forming.
  • the terms "conversion layer” and "functional layer” are used synonymously. While the term “conversion layer” is used more in the context of chemical composition and formation process, the term “functional layer” is more likely to be associated with the effect of this layer (in subsequent process steps).
  • a coated galvanized steel sheet according to the invention can be used in particular for producing a motor vehicle component, wherein the steel sheet is subjected to one or more forming steps.
  • the conversion layer applied to the galvanized sheet steel as a tribo layer is suitable for use in the automotive industry; and also the application of the treatment solution can be industrially implemented in mass production.
  • an aqueous solution or suspension of at least one carbonate supplier or an aqueous solution or suspension of at least one carbonate supplier and at least one hydroxide supplier allows the formation of a conversion layer as an inorganic functional layer or tribo layer on the surface of a galvanized steel sheet.
  • the carbonate supplier (s) are selected from ammonium bicarbonate, ammonium carbonate, alkali metal hydrogencarbonates, alkali metal carbonates, and alkali metal carboxylates
  • the hydroxide source (s) are selected from alkali metal hydroxides, alkali metal oxides, alkali metal alcoholates, and magnesium hydroxides or magnesium oxide.
  • solids with a lattice structure should be particularly suitable for reducing the solid-state friction, in which the combination of the structure-forming layers with one another is significantly weaker in one spatial direction than in the layer plane. This property is found z.
  • MoS 2 molybdenum disulfide
  • h-BN hexagonal boron nitride
  • such solids are generally not suitable for use on sheet metal surfaces for automobile bodies, since they exert a separating effect on the adhesives used in the shell.
  • the above-mentioned substances have low surface energies and are insoluble in the treatment baths used for cleaning and pretreating the body panels, which would lead to poor results in the structure of the paint job.
  • a suitable mineral is brucite, which consists of magnesium hydroxide, Mg (OH) 2 . It forms a layer grid of the Cdl 2 type (where the iodide ions form a hexagonal close-packed spherical packing, the octahedral gaps of every second interlayer space are completely filled with cadmium ions) with pronounced cleavage in one spatial direction, but in contrast to graphite, molybdenum disulfide or hexagonal boron nitride has no markedly low surface energies and is soluble in processing baths because of its predominantly ionic bonding character.
  • the functional or conversion layer to be produced on the galvanized steel surface ensures the reduction of the friction during forming of the steel sheet.
  • the conversion layer is formed by the reaction of the surface-dried solution described above with the metal surface.
  • the thickness of the conversion layer thus results from the concentration of the treatment solution and the thickness of the applied wet film.
  • the basis weight of the dry substance is 25 to 200 mg / m 2 , preferably 40 to 90 mg / m 2 .
  • the pH of the treatment solution or suspension should be 7 to 13, in particular 8 to 12.
  • the solutions or suspensions of the carbonate or hydroxide suppliers may contain cations of the elements lithium, sodium, potassium, rubidium, cesium, but preferably sodium and potassium, and magnesium hydroxide or oxide.
  • the treatment solution may contain as an additive a tracer system which, although not required to obtain the tribological effect, serves as an indicator for the quantitative detection of the applied amount and does not hinder the formation of the conversion layer.
  • a tracer system which, although not required to obtain the tribological effect, serves as an indicator for the quantitative detection of the applied amount and does not hinder the formation of the conversion layer.
  • substances of the following elements can be used: potassium, phosphorus, silicon, tin or titanium. These elements can be detected more easily than the element sodium by X-ray fluorescence analysis (RFA).
  • the compounds potassium carbonate / bicarbonate, Na / K phosphate or Na / K di- (tri-phosphates, alkali silicate (especially sodium silicate, potassium silicate) tin carbonate / bicarbonate may preferably be used for this purpose to 1.5 wt .-% of the respective tracer system, preferably 0.05 to 1 wt .-%.
  • the application of the solution or suspension can generally be done by dipping, spraying, spraying / squeezing, roller coater or combinations of these methods with subsequent drying - of course, or thermally assisted.
  • the galvanized sheet steel coated according to the invention has a reduced coefficient of friction, wherein in addition the stick-slip behavior is avoided or at least reduced. Furthermore, the transfer of material from the workpiece to the tool and the formation of metal abrasion is reduced. On the other hand, the paintability and adhesiveness of the surface is retained.
  • the galvanized sheet steel coated according to the invention is wash-resistant to wash oils, while the conversion layer is very readily wettable with water.
  • the Fig. 1 shows a preferred simple method for producing a friction-reducing coated steel sheet according to the invention.
  • the sketched for carrying out the process plant can be roughly divided into three steps, jetting, squeezing and drying.
  • the galvanized steel strip 1 is moved in accordance with the feed direction a and guided between the rubberized squeegee rollers 10, which are located above and below the Steel strip 1 are located.
  • the treatment solution L (or suspension) is sprayed in excess onto the rubber coating 11 of the squeeze rollers 10.
  • the excess of the processing solution L at the squeegee 10 above the steel strip 1 flows first onto the steel strip 1, then over the strip edge in the receiver 13, while the excess of the treatment solution L at the squeegee 10 below the steel strip 1 directly from the roller 10 back into the storage container 13 passes. From the reservoir 13, the treatment solution L is supplied to the appropriate application lines 14 the application devices 12.
  • the self-propelled squeeze rolls 10 are placed on the surfaces of the steel strip 1 with pneumatic or hydraulic pressure and strip the excess processing solution L thereon.
  • the upper roller serves as an abutment for the lower roller and vice versa.
  • the Anstelldrucks the hardness of the rubber coating 11, the relative speed of the squeeze rollers 10, which rotate at speed b, the steel strip 1 and the speed a of the steel strip 1 wet films 2 'of 1 to 20 microns, but preferably 2 to 3 microns produced become. Thinner wet films may be preferred as they allow shorter dryer runs, lower belt temperatures, or faster belt speeds.
  • the wet film 2 ' is dried in a circulating air dryer 15, so that the functional layer 2 is obtained on the hot-dip galvanized steel strip surface. Between outlet squeeze rollers 10 and outlet circulating air dryer 15, the steel strip 1 is tensioned without support.
  • the wet film can also be air-dried.
  • Construction and arrangement of the application device may well differ from the example shown.
  • roller coater As an alternative to the example shown, the application by a equipped with two or three rollers Rollcoater conceivable that greater freedom in the Allow design of the wet film regardless of the belt speed. Rollcoaters are also part of the standard equipment for many systems, especially for the inline coating of antifinger printing. However, since roller coater cause significantly higher investment, maintenance and operating costs, they are used for simple post-treatments, as it represents the application of the treatment solution according to the invention, less frequently.
  • sodium and potassium carbonate and bicarbonate or sodium and potassium bicarbonate and hydroxide are selected with a total concentration in the treatment solution of 3 to 5 wt .-% and the pH in a range of 7 to 13, preferably 8 to 12, more preferably set to 9.
  • the pH of the treatment solution should be in a range from 7 to 13, preferably 8 to 12, more preferably about 9, and is optionally adjusted, preferably with NaOH or KOH.
  • the exemplary process described here of forming conversion layers by the action of basic alkali metal carbonates on galvanized steel surfaces provides for the formation of structures which resemble the hydrozincite Zn 5 [(OH) 6
  • the wet film applied to the metal surface according to the invention is dried and subsequently not rinsed with water. Therefore, all non-volatile components remain on the surface.
  • the layer weight of the dry substance is in a range of 25 to 200 mg / m 2, preferably 40 to 90 mg / m 2 .
  • the layer weight of the forming conversion layer is correspondingly larger due to corrosion and incorporation of the zinc, aluminum or magnesium from the sheet surface.
  • the coating weight of the dry substance can be determined by the thickness of the wet film as a function of the concentration of the treatment solution. For example, a wet film of a 3% solution is to be applied 1.3 to 3.0 ⁇ m thick in order to achieve the preferred basis weight of the dry matter of 40 to 90 mg / m 2 .
  • the layer thickness can be checked by X-ray fluorescence analysis of the added to the solution and present in the dry substance tracer elements potassium, phosphorus, sulfur or silicon, tin, titanium.
  • the friction-reducing effect of the conversion layer can be detected, for example, by strip drawing experiments based on VDA 230-213 and by cup draw tests, as described below with reference to FIGS FIGS. 2 to 4 will be shown.
  • treatment solutions used to treat the sheets for strip pulling tests and cupping tests are listed in the table below.
  • Table 1 Examples of treatment solutions: description
  • Treatment or aqueous treatment solution FG TS [mg / m 2 ] EMERGENCY untreated - NC 5% by weight NaHCO 3 / NaOH, pH 9 70 KC 5% by weight KHCO 3 / KOH, pH 9 70 NC + KC 4.25% NaHCO 3 + 0.75% KHCO 3 / NaOH, pH 9 70 NC + PH 4.25% NaHCO 3 + 0.75% Na tripolyphosphate / NaOH, pH 9 70 NC + S 4.25% NaHCO 3 + 0.75% Na 2 SO 4 / NaOH, pH 9 70 NC + Si 4.25% NaHCO 3 + 0.75% Na metasilicate / NaOH, pH 9 70 NC + SiO 2 4.25% NaHCO 3 + 0.75% SiO 2 dispersion Aerodisp W 7520 N (Evonik, Hanau) / NaOH, pH 9 70 H 2
  • the 5% strength by weight treatment solution having a pH of 9 is obtained by dissolving 50 g of NaHCO 3 in 950 g of demineralized water and then the solution with sodium hydroxide solution (eg with 50% by weight of NaOH) pH 9 is adjusted.
  • Fig. 2 shows in a graph in which the friction coefficient is plotted against the contact pressure, results for flat-strip stripping experiments, on a treated with 5 wt .-% NaHCO 3 / NaOH aqueous solution (pH 9) NC sheet and a 5 wt. % KHCO 3 / KOH aqueous solution (pH 9) treated sheet KC (see Table 1) and for comparison on an untreated sheet NOT according to VDA 230-213 were performed.
  • the maximum punch force on the untreated sheet NOT is plotted against the differently pretreated sheet according to Table 1.
  • Both treated sheets NC pH 11.5 and NC pH 8.6 surprisingly require a significantly reduced maximum punch force in the cup drawing test in comparison to that Untreated sheet NOT, wherein the treated at pH 8.6 sheet NC pH 8.6 performs even better than the treated at pH 11.5 sheet NC pH 11.5, resulting from the fact that at pH 8.6 the formation of the tribological particularly effective hydrozincite Zn 5 [(OH) 6 (CO 3 ) 2 ] thermodynamically preferred, while at pH 11.5, the formation of the less effective zinc oxide and hydroxide takes place.
  • the conversion layer is compatible with a subsequent manufacturing process of a car body shell:
  • the temporary corrosion protection of the steel sheet is indispensable for the storage and transport of steel coils and still unpainted pressed parts. This is usually achieved by applying anti-corrosive or Prelube oils or waxy hotmelt dry lubricants in the rolling mill.
  • the proof of the corrosion protection properties can be carried out by way of example by means of a condensed water climate test, as described in the test specification VDA 230-213.
  • the Prelube Anticorit PL 3802-39 S used for lubrication has been used for years for coil lubrication in the German steel and automotive industry. It can therefore be assumed that the conversion coatings are suitable for the temporary corrosion protection of coils and pressed parts.
  • a good adhesion of the adhesives used is essential for the carcass shell.
  • the compatibility of the conversion layer with such structural adhesives can be investigated by way of example with an adhesive bead test.
  • the adhesive bead is mechanically peeled off and the surfaces of the sheet and the removed bead are examined.
  • a retention of adhesive residues on the metal surface indicates good adhesion of adhesive metal.
  • Such good adhesion is accompanied by a rough, and thus whitish surface of the adhesive bead.
  • the adhesives used were, for example, the products Betamate TM 1496 F and Betamate TM 1040 from Dow Automotive.
  • the adhesion properties of the test sheets with conversion layer advantageously correspond to those without such pretreatment (NOT).
  • a cohesive (CF) or near-surface cohesive (SCF) fracture pattern was achieved in all cases.
  • the adhesive beads cured on the sheets were subjected to corrosion before peeling.
  • moisture loads were carried out over a period of 504 h at 50 ° C and 95% relative humidity. It was found that the fracture pattern after the corrosion load is also cohesive (CF) or near-surface cohesive (SCF).
EP13004572.7A 2013-09-19 2013-09-19 Anorganische Funktionsschicht auf feuerverzinktem Stahl als Umformhilfe Active EP2851452B1 (de)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES13004572T ES2734456T3 (es) 2013-09-19 2013-09-19 Capa funcional inorgánica sobre acero galvanizado por inmersión en caliente como ayuda para la conformación
PL13004572T PL2851452T3 (pl) 2013-09-19 2013-09-19 Nieorganiczna powłoka funkcyjna na stali ocynkowanej ogniowo jako pomocna przy formowaniu
EP13004572.7A EP2851452B1 (de) 2013-09-19 2013-09-19 Anorganische Funktionsschicht auf feuerverzinktem Stahl als Umformhilfe
PCT/EP2014/002550 WO2015039762A1 (de) 2013-09-19 2014-09-19 Anorganische karbonat- basierende konversionssschicht auf verzinktem stahl

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WO2015197430A1 (en) * 2014-06-27 2015-12-30 Henkel Ag & Co. Kgaa Dry lubricant for zinc coated steel
WO2017125131A1 (de) 2016-01-19 2017-07-27 Thyssenkrupp Steel Europe Ag Verfahren zum herstellen eines stahlprodukts mit einer zn-beschichtung und einer darauf aufgetragenen tribologisch aktiven schicht sowie entsprechend beschaffenes stahlprodukt
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CN110546303A (zh) 2017-03-30 2019-12-06 塔塔钢铁艾默伊登有限责任公司 用于处理金属表面的含水酸性组合物、使用这种组合物的处理方法和经处理的金属表面的用途

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WO2015197430A1 (en) * 2014-06-27 2015-12-30 Henkel Ag & Co. Kgaa Dry lubricant for zinc coated steel
EP3161176B1 (en) 2014-06-27 2018-12-19 Henkel AG & Co. KGaA Dry lubricant for zinc coated steel
US10287665B2 (en) 2014-06-27 2019-05-14 Henkel Ag & Co. Kgaa Dry lubricant for zinc coated steel
WO2017125131A1 (de) 2016-01-19 2017-07-27 Thyssenkrupp Steel Europe Ag Verfahren zum herstellen eines stahlprodukts mit einer zn-beschichtung und einer darauf aufgetragenen tribologisch aktiven schicht sowie entsprechend beschaffenes stahlprodukt
US11078573B2 (en) 2016-01-19 2021-08-03 Thyssenkrupp Ag Method for producing a steel product with a Zn coating and a tribologically active layer deposited on the coating, and a steel product produced according to said method
WO2020064548A1 (de) 2018-09-24 2020-04-02 Thyssenkrupp Steel Europe Ag Verfahren zur verbesserung der phosphatierbarkeit von metallischen oberflächen, welche mit einer temporären vor- bzw. nachbehandlung versehen werden

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WO2015039762A1 (de) 2015-03-26
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PL2851452T3 (pl) 2019-10-31

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