EP0355272B1 - Für die Aussenseite von Kraftfahrzeugkarosserieteilen bestimmtes mehrfach beschichtetes Stahlblech - Google Patents

Für die Aussenseite von Kraftfahrzeugkarosserieteilen bestimmtes mehrfach beschichtetes Stahlblech Download PDF

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Publication number
EP0355272B1
EP0355272B1 EP89108873A EP89108873A EP0355272B1 EP 0355272 B1 EP0355272 B1 EP 0355272B1 EP 89108873 A EP89108873 A EP 89108873A EP 89108873 A EP89108873 A EP 89108873A EP 0355272 B1 EP0355272 B1 EP 0355272B1
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EP
European Patent Office
Prior art keywords
zinc
steel sheet
coating
coated steel
sheet according
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.)
Expired - Lifetime
Application number
EP89108873A
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German (de)
English (en)
French (fr)
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EP0355272A1 (de
Inventor
Uwe Dr. Dipl.-Chem. Dittebrandt
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.)
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
Original Assignee
Ford Werke GmbH
Ford France SA
Ford Motor Co Ltd
Ford Motor Co
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Publication date
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Application filed by Ford Werke GmbH, Ford France SA, Ford Motor Co Ltd, Ford Motor Co filed Critical Ford Werke GmbH
Publication of EP0355272A1 publication Critical patent/EP0355272A1/de
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/06—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6
    • C23C22/07—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH less than 6 containing phosphates
    • C23C22/08—Orthophosphates
    • C23C22/12—Orthophosphates containing zinc cations
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D13/00—Electrophoretic coating characterised by the process
    • C25D13/20—Pretreatment

Definitions

  • the invention relates to a multi-coated steel sheet for exterior car body parts, a process for its production and its use.
  • coated steel sheets having zinc nickel phosphate layers have improved paint adhesion, corrosion resistance and alkali solubility resistance. It is also described there that a phosphate conversion layer improves the adhesion of the zinc layer to the sheet. This print step also does not give any instructions as to how further layers should be selected on the sheet in order to obtain optimal rockfall behavior.
  • DE-C2-3412234 states that in the case of deformable, coated metal sheets for motor vehicles which are to be further processed in press tools, zinc layers with a thickness of more than about 1.5 ⁇ m are undesirable and are not deformable. For the rest, there is no suggestion for a selection of a combination of layers from the plethora of options for a multi-layer coating on sheet metal.
  • From DE-OS 31 51 121 is a suitable for building material or material for electrical household appliances, surface-treated steel sheet made of a base steel sheet, an iron-zinc film plated thereon in an amount of 0.1 g / m2 with an iron content from 3 to 30% by weight and a film of a silicate resin in an amount of 0.05 to 5.0 g / m2 of an acrylic copolymer, an epoxy resin, a silicon dioxide sol and a trialkoxysilane compound.
  • a silicate resin in an amount of 0.05 to 5.0 g / m2 of an acrylic copolymer, an epoxy resin, a silicon dioxide sol and a trialkoxysilane compound.
  • a problem with multi-coated, deformable sheets is that their stone chip resistance can be improved.
  • the zinc alloy of the first layer a) consists of a Zn-Ni alloy or a Zn-Fe alloy.
  • the further phosphate of the phosphating layer b) consists of nickel or manganese phosphate.
  • the phosphating layer was preferably deposited from an acidic solution containing 0.5 to 1.5 g / l zinc phosphate and at least 2 to 5 times the amount of phosphate of nickel and / or manganese.
  • a layer based on epoxy resin or made of a polyester lacquer in particular a polyurethane-modified polyester resin lacquer, e.g. with 2 to 8% by weight of polyurethane.
  • the sliding primer layer is built up on the basis of an amine-modified epoxy resin.
  • the steel base is preferably made of a mild steel sheet.
  • a multi-coated steel sheet according to the invention is as a stone chip-resistant sheet for the outside of body parts.
  • the coated sheets obtained could be easily punched and shaped into body components without showing any damage. It was completely surprising, however, that such a structure resulted in a significantly superior stone chip resistance, in particular with regard to the splintering in the event of stone chips up to the steel sheet. At the same time, the corrosion resistance and rust resistance of the steel sheet was significantly increased, although several operations could be saved.
  • steel sheet can be considered as the steel base, although in practice mild steel sheets are used for body components and are also preferred in the present case.
  • the first layer applied by the coil coating process consists of a 5 to 8 ⁇ m thick, galvanically deposited layer of zinc or a zinc alloy.
  • zinc-nickel alloys or zinc-iron alloys are suitable as zinc alloys, of which a zinc-nickel alloy is particularly preferred.
  • the galvanic deposition of a layer of zinc or a zinc alloy is well known to the person skilled in the art, the conditions to be used, such as voltage, concentrations and the like, need not be discussed in more detail here.
  • the deposition takes place according to the coil coating process, which means the continuous coating of steel strips, which are delivered in roll or ring form, whereby the continuous mode of operation and the roll form of the sheet is decisive.
  • the thickness of the zinc or zinc alloy layer on the sheet is 5 to 8 ⁇ m, with thicknesses in the range of around 5 ⁇ m being preferred for economic reasons.
  • a phosphating layer with 1.2 to 2.0 g / m 2 of sheet metal is deposited on the galvanically deposited zinc or zinc alloy layer, this layer being deposited from an acidic phosphating solution which, as essential components, has a lower zinc phosphate content and a higher content of another phosphate of a divalent metal.
  • Manganese and nickel have proven to be suitable as another divalent metal for the phosphate, nickel being particularly preferred.
  • the phosphating can be carried out by any method as is common in the art.
  • Layers are then obtained which contain 5 to 10% by weight of a further divalent metal in the zinc / zinc phosphate layer.
  • the sliding primer layer is then applied in a conventional manner to the sheet coated with a zinc and a phosphate layer.
  • slip primer layers usually consist of an organic resin material, preferred as base resins for the application of the same epoxy resins, in particular amine-modified epoxy resins and polyester resin coatings, in particular polyurethane-modified polyester coatings, which have about 2 to 8% by weight of polyurethane.
  • the multi-coated metal sheet produced in this way can then be punched without further ado and pressed, for example, in a three-axis press to the desired body part.
  • These molded body parts can then be coated in the usual way for the top of the coating with colored or pigmented lacquers without deviating from the previous method, since the adhesion of the anti-friction primer for these layers is very good.
  • the invention results in a reduction in the complexity of the processes and investment costs, since the painting methods could be significantly simplified.
  • there is also an improvement in tool service life, for example the three-axis press since the layer structure according to the invention, in particular the sliding primer layer, reduces its wear during deformation.
  • a sheet according to the invention has a steel base 1, on which a zinc or zinc alloy layer 2 is applied, on which there is a phosphating layer 3, which has been deposited from a so-called low zinc phosphating solution, whereby on which the sliding primer layer 4 lies.
  • FIG. 2 schematically shows a top view of the front part of a hood composed of two halves of the laser welding, wherein on the left half 47 a material of the previous coating used for comparison and on the right half 48 the coating according to the invention is present.
  • FIG. 2 shows the appearance of the hood assembled in this way after a puncture damage test.
  • Figure 2 was obtained in accordance with a photograph, in which reference number 5 denotes the front part of the hood, reference number 6 the beveled longitudinal part of the hood, 7 the crease edge and 8 the puncture damage points after the durability test. It can clearly be seen that damage to the right half 48 of the hood, painted according to the invention, could not be detected photographically, while it occurred on the left half 47, the after the previous practice had been coated, are clearly visible.
  • This material was used as the material according to the invention in the subsequent comparison test.
  • test bonnets consisting of one piece were connected and laser welded by laser welding of steel sheets in accordance with previous practice without zinc coating and the multilayer steel sheets according to the invention, so that a compression molding of the hood surface under production conditions was possible in a three-axis press. These so-called bonnet tops were then passed through the usual paint coating system.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP89108873A 1988-08-25 1989-05-17 Für die Aussenseite von Kraftfahrzeugkarosserieteilen bestimmtes mehrfach beschichtetes Stahlblech Expired - Lifetime EP0355272B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3828888 1988-08-25
DE3828888A DE3828888A1 (de) 1988-08-25 1988-08-25 Fuer die aussenseite von kraftfahrzeugkarosserieteilen bestimmtes mehrfach beschichtetes stahlblech

Publications (2)

Publication Number Publication Date
EP0355272A1 EP0355272A1 (de) 1990-02-28
EP0355272B1 true EP0355272B1 (de) 1992-03-18

Family

ID=6361591

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89108873A Expired - Lifetime EP0355272B1 (de) 1988-08-25 1989-05-17 Für die Aussenseite von Kraftfahrzeugkarosserieteilen bestimmtes mehrfach beschichtetes Stahlblech

Country Status (3)

Country Link
EP (1) EP0355272B1 (enrdf_load_stackoverflow)
DE (2) DE3828888A1 (enrdf_load_stackoverflow)
ES (1) ES2029545T3 (enrdf_load_stackoverflow)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2847275B1 (fr) * 2002-11-19 2006-03-31 Usinor Tole d'acier nu ou d'acier zingue revetue d'une couche de zinc ou d'alliage de zinc comprenant un polymere, et procede de fabrication par electrodeposition
ITTO20040182A1 (it) * 2004-03-18 2004-06-18 Idea Project S A G L Procedimento di modifica di elementi strutturali di veicoli sottoposti a trattamenti elettroforetici

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412234C2 (enrdf_load_stackoverflow) * 1984-04-02 1988-10-20 Ici Lacke Farben Gmbh, 4010 Hilden, De

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1287892B (enrdf_load_stackoverflow) * 1965-03-31 Metallgesellschaft Ag
JPS5811513B2 (ja) * 1979-02-13 1983-03-03 日本ペイント株式会社 金属表面の保護方法
DE3101866A1 (de) * 1981-01-22 1982-08-26 Metallgesellschaft Ag, 6000 Frankfurt Verfahren zur phosphatierung von metallen
US4681641A (en) * 1982-07-12 1987-07-21 Ford Motor Company Alkaline resistant phosphate conversion coatings
US4793867A (en) * 1986-09-26 1988-12-27 Chemfil Corporation Phosphate coating composition and method of applying a zinc-nickel phosphate coating

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412234C2 (enrdf_load_stackoverflow) * 1984-04-02 1988-10-20 Ici Lacke Farben Gmbh, 4010 Hilden, De

Also Published As

Publication number Publication date
ES2029545T3 (es) 1992-08-16
DE3828888C2 (enrdf_load_stackoverflow) 1992-01-30
DE58900985D1 (de) 1992-04-23
DE3828888A1 (de) 1990-03-08
EP0355272A1 (de) 1990-02-28

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