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
  • C23C22/48—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 not containing phosphates, hexavalent chromium compounds, fluorides or complex fluorides, molybdates, tungstates, vanadates or oxalates
  • C23C22/53—Treatment of zinc or alloys based thereon
• • 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
• • 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
  • C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
  • C23C2/26—After-treatment
• • C—CHEMISTRY; METALLURGY
  • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
  • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
  • 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
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D11/00—Electrolytic coating by surface reaction, i.e. forming conversion layers
  • C25D11/02—Anodisation
  • C25D11/34—Anodisation of metals or alloys not provided for in groups C25D11/04 - C25D11/32
• • C—CHEMISTRY; METALLURGY
  • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
  • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
  • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
  • C25D5/48—After-treatment of electroplated surfaces
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T428/00—Stock material or miscellaneous articles
  • Y10T428/12—All metal or with adjacent metals
  • Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
  • Y10T428/1266—O, S, or organic compound in metal component

Definitions

• the present invention relates to a sheet comprising a steel substrate coated on at least one of its faces with a coating comprising zinc and magnesium.
• Such sheets are more particularly intended for the manufacture of parts for the automobile, without being limited thereto.
• Coatings essentially comprising zinc are traditionally used for their good protection against corrosion, whether in the automotive sector or in construction, for example. However, these coatings cause weldability problems and are now competing with coatings comprising zinc and magnesium.
• magnesium significantly increases the resistance to perforating corrosion of these coatings, which can reduce their thickness and thus improve their weldability or to maintain the coating thickness and increase the guarantee of protection against corrosion over time.
• the improvement in corrosion resistance is such that it is now possible to reduce or even eliminate the use of secondary protective measures such as the use of waxes or sealants at the places most likely to to be corroded.
• sheet metal coils with such surface coatings can sometimes remain in storage sheds for several months and must not see this surface deteriorate by the appearance of surface corrosion, before being put into service. form by the end user.
• no corrosion primer should appear regardless of the storage environment, even in the event of exposure to the sun and / or a wet or salty environment.
• Standard galvanized products that is to say whose coatings essentially comprise zinc, are also subject to these stresses and are coated with a protective oil which is generally sufficient.
• coatings comprising zinc and magnesium exhibit during storage a slight surface oxidation which modifies the interaction of light with the surface and which modifies its visual aspect. Indeed, we then observe the appearance of black spots for coatings comprising zinc and magnesium, this phenomenon being referred to as blackening.
• blackening For coatings that include zinc, magnesium, and aluminum, the entire surface that is no longer covered with oil tarnishes. This is called tarnishing.
• a temporary protection oil is quite restrictive because, on the one hand, the oil tends to dirty the working environment and the tools used to cut and shape the coils of sheet metal and on the other hand, a degreasing is often necessary in a subsequent step of manufacturing the parts from these coils.
• the invention firstly relates to a use according to claim 1.
• the invention also has for its second object a sheet according to claim 15.
• the sheet according to the invention may also comprise the features of claims 16 to 18, taken separately or in combination.
• FIG. 1 is a diagrammatic sectional view illustrating the structure of a sheet according to the invention
• FIGS. 2A to 2D and 3A to 3F are snapshots illustrating the results of humidity-humidification tests carried out on various specimens of sheets treated according to the invention or untreated,
• FIGS. 4 to 6 show curves illustrating the results of aging tests in natural exposure under shelter carried out on various test pieces of sheet treated according to the invention or untreated.
• the sheet 1 of FIG. 1 comprises a substrate 3 made of steel, preferably hot-rolled then cold-rolled, and is for example wound so as to be able to be used later as a bodywork part for the automobile.
• the invention is not limited to this area and can find a job for any steel piece regardless of its end use.
• the sheet 1 will then be unwound from the coil and cut and shaped to form a part.
• the substrate 3 is covered on one side 5 by a coating 7.
• a coating 7 may be present on both sides of the substrate 3.
• the coating 7 comprises at least one layer 9 based on zinc.
• the layer 9 preferably comprises from 0.1 to 20% by weight of magnesium.
• This layer 9 generally has a thickness less than or equal to 20 ⁇ and aims to protect the substrate 3 against perforating corrosion, in a conventional manner. It will be observed that the relative thicknesses of the substrate 3 and the different layers covering it have not been respected in FIG. 1 in order to facilitate the representation.
• the layer 9 comprises at least 0.1% by weight of magnesium because no protective effect against perforating corrosion is visible below.
• the layer 9 contains at least 0.5%, preferably at least 2% by weight of magnesium.
• the magnesium content is limited to 20% by weight in the layer 9 because it has been observed that a larger proportion would lead to a too rapid consumption of the coating 7 and thus paradoxically degraded anticorrosive performance.
• the layer 9 can in particular be obtained by a vacuum deposition method such as magnetron sputtering, or vacuum evaporation by Joule effect, induction or under an electron beam ⁇
• the layer 9 generally only comprises zinc and magnesium, other elements, such as aluminum or silicon, may however be added, if necessary, to improve other characteristics of the layer 9 such as ductility or substrate adhesion 3.
• the layer 9 comprises only zinc and magnesium, it is particularly preferred that the layer 9 comprises between 14 and 18% by weight of magnesium, and better that it corresponds mainly to the intermetallic compound of formula Zn 2 Mg, comprising approximately 16% by weight of magnesium, which exhibits particularly good perforating corrosion resistance properties.
• the coating 7 may comprise a layer 11 of zinc between the layer 9 and the face 5 of the substrate 3. This layer 11 may have been obtained for example by a vacuum deposition or electroplating process.
• magnesium can simply be deposited under vacuum on zinc previously deposited by electrodeposition on the substrate 3 and then carry out a heat treatment to combine the deposited magnesium and zinc and thus constitute the layer 9 comprising zinc and magnesium overlying the layer 11 comprising zinc.
• the layer 9 comprises zinc, magnesium and aluminum
• the layer 9 comprises between 0.1 and 10% by weight of magnesium and between 0.1 and 20% by weight of aluminum. More preferably, the layer 9 comprises between 2 and 4% by weight of magnesium and between 2 and 6% by weight of aluminum, and is therefore close to the composition of the ternary zinc / aluminum / magnesium eutectic.
• the layer 9 can be obtained by a hot dipping coating process in a molten zinc bath containing magnesium up to a content of 10% by weight and aluminum to a content of 20%. % in weight.
• the bath may also contain up to 0.3% by weight of optional addition elements such as Si, Sb, Pb, Ti, Ca, Mn, Sn, La, Ce, Cr, Ni, Zr or Bi.
• the bath may finally contain residual elements from the ingots or resulting from the passage of the substrate 3 in the bath.
• the coating 7 is covered with a layer 13 of temporary protection.
• the layer 13 was obtained for example by application to the coating 7, optionally after degreasing, of an aqueous treatment solution containing sulphate ions S0 4 2 - at a concentration greater than or equal to 0.01 mol / l. 13 thus formed is based on zinc hydroxysulfate and zinc sulphate and is at the same time sufficiently thick and adherent.
• the aqueous treatment solution is applied conventionally, for example by dipping, by spraying or by coating.
• the aqueous treatment solution additionally contains Zn 2+ ions at a concentration greater than or equal to 0.01 mol / l, which make it possible to obtain a more homogeneous deposition.
• the aqueous solution of treatment by dissolution of zinc sulphate in pure water is prepared.
• zinc sulfate heptahydrate ZnSO 4, 7H 2 O
• the concentration of ions Zn 2+ is then equal to that of the anions S0 4 2 ⁇
• the pH of the aqueous treatment solution preferably corresponds to the natural pH of the solution, without addition of base or acid. The value of this pH is generally between 5 and 7.
• the aqueous treatment solution is applied to the coating 7, under conditions of temperature, time of contact with the coating 7, concentration of S0 4 2 " ions and Zn 2+ ions adjusted so that the layer 13 contains an amount of sulfur greater than or equal to 0.5 mg / m 2 .
• the contact time of the aqueous treatment solution with the coating 7 is between 2 seconds and 2 minutes, and the temperature of the aqueous treatment solution is between 20 and 60 ° C.
• the used aqueous treatment solution contains between 20 and 160 g / l of zinc sulfate heptahydrate, corresponding to an ion concentration of Zn 2+ ions and a concentration of S0 4 2 "of between 0.07 and 0.55 Indeed, it has been found that, in this concentration range, the deposition rate was little influenced by the value of the concentration.
• the aqueous treatment solution is applied under conditions of temperature, time of contact with the coating 7, and concentrations of S0 4 2 " ions and Zn 2+ ions adjusted to form a layer 13 having a quantity of sulfur between 3.7 and 27 mg / m 2 .
• the aqueous treatment solution contains an oxidizing agent for zinc, such as hydrogen peroxide.
• This oxidizing agent can have a very marked hydroxysulfation and sulphation accelerator effect at low concentration. It has been found that the addition of only 0.03%, ie 8.10 -3 mol / l of hydrogen peroxide, or 2.10 -4 mol / l of potassium permanganate in the solution allowed to double (approximately) the speed of deposit. It has been found, on the contrary, that concentrations 100 times higher no longer made it possible to obtain this improvement in the deposition rate.
• the layer 13 deposited is adherent. Drying is adjusted to remove residual liquid water from the deposit.
• the sheet 1 is preferably rinsed so as to eliminate the soluble part of the deposit obtained.
• the absence of rinsing and the obtaining of a partially water-soluble deposit resulting therefrom are not very detrimental to the reduction of the degradation of the coating 7 during the subsequent shaping of the sheet 1, the moment that the deposit obtained comprises a layer 13 insoluble in water.
• the aqueous treatment solution comprises an ion concentration S0 4 2 "greater than or equal to 0.01 mol / l and is applied under anodic polarization, and the pH of the aqueous solution of treatment is greater than or equal to 12, and less than 13.
• the pH of the solution is less than 12, no hydroxysu adhering adhesives are formed on the surface to be treated. If the pH of the solution is greater than or equal to 13, the hydroxysulfate is redissolved and / or decomposed into zinc hydroxides.
• the sodium sulfate concentration is less than 1.42 g / l in the solution, little formation of hydroxysulfates is observed on the surface.
• This concentration is equivalent to 0.01 mol / l of S0 4 2 " and, more generally, it is therefore important for the concentration of S0 4 2" ions to be greater than or equal to 0.01 mol / l, and preferably greater than or equal to 0.01 mol / l. or equal to 0.07 mol / l.
• the concentration of sulphate ions is preferably less than or equal to 1 mol / liter.
• concentrations greater than 142 g / l, for example 180 g / l at concentrations greater than 142 g / l, for example 180 g / l, a decrease in the formation yield of the layer 13 is observed.
• the total amount of hydroxysulfates and sulphates deposited should be greater than or equal to 0.5 mg / m 2 and not more than 30 mg / m 2 in sulfur equivalent, preferably between 3.5 and 27 mg / m 2 sulfur equivalent.
• the charge density applied is preferably between 10 and 100 C / dm 2 of surface to be treated.
• the layer 13 based on zinc hydroxysulfate and zinc sulphate should be deposited under a high polarization current density, especially greater than 20 A / dm 2 and, for example, 200 A / dm 2 .
• the temperature of the aqueous treatment solution is generally between 20 ° C and 60 ° C. Preferably, a temperature greater than or equal to 40 ° C. is used, so as to increase the conductivity of the solution and to reduce the ohmic losses.
• the treated surface is thoroughly rinsed with demineralised water. This rinsing step removes alkaline reagents on the surface of the deposit, which would cause corrosion problems.
• the layer 13 of the sheet 1 may be optionally lubricated. This lubrication can be ensured by applying an oil film (not shown) with a weight of less than 2 g / m 2 on the layer 13.
• a layer 13 makes it possible to improve the resistance to blackening in the case of a coating 7 comprising zinc. and magnesium, and to improve the tarnish resistance in cases where the coating 7 comprises zinc, magnesium, and aluminum. This increased resistance is particularly useful in the absence of an oil film, for example following dewetting of an oil film applied to the coating 7.
• This increase in the resistance to blackening and tarnishing is mainly due to the formation of a conversion layer based on zinc hydroxysulfate Zn 4 S0 4 (OH) 6 .
• the reactions involved in applying the aqueous treatment solution to the coating 7 are:
• the presence of magnesium in the coating 7 contributes to stabilizing the zinc hydroxysulfate layer over time and thus preventing its conversion into zinc carbonate under the effect of the C0 2 content in the air.
• Zinc carbonates are indeed known to have a less protective (less barrier) power than zinc hydroxysulfates.
• Test pieces are cut into two types of sheet 1, namely:
• sheets 1, the coating 7 of which comprises a layer 1 1 of zinc 5.5 ⁇ m in thickness and a layer 9 of 3.5 ⁇ m in thickness, the layer 9 comprising approximately 84% by weight of zinc and 16% by weight of magnesium.
• a layer of 7.5 ⁇ of zinc was first deposited by electroplating and a layer of 1.5 ⁇ of magnesium by vacuum deposition and the sheet was subjected to a heat treatment to combine the magnesium and zinc.
• These specimens will be designated ZEMg thereafter; and sheets 1, the coating 7 of which comprises a 4 ⁇ m thick layer of zinc deposited by vacuum deposition and a layer 9 of 3.5 ⁇ deposited by vacuum deposition and comprising approximately 80% by weight of zinc and % by weight of magnesium.
• ZnMg Full PVD thereafter.
• the substrate 3 of ZEMg and ZnMgFullPVD specimens is a cold rolled steel for deep drawing.
• test pieces were coated with a layer 13 having a weight of between 17 and 20 mg / m 2 of sulfur.
• the application conditions for forming the layer 13 were as follows:
• Drying by carrying the specimens to a temperature between 70 and 80 ° C.
• test pieces are subjected to aging cycles of 24 hours in a humidotherm, that is to say an enclosure with controlled atmosphere and temperature. These cycles simulate the corrosion conditions of a sheet metal coil or sheet metal sheet during storage.
• a humidotherm that is to say an enclosure with controlled atmosphere and temperature.
• the proportion of altered surface is determined by visual inspection of an operator.
• Figure 2A shows the visual appearance of a ZEMg test tube without Layer 3 after Quaker 6130 oiling as described above.
• This test tube has a significant darkening making it unfit for use by French car manufacturers.
• the ZEMg test pieces with layer 13 FIGGS. 2B to 2D
• the ZEMg test pieces with layer 13 FIGS. 2B to 2D
• FIGS. 3A to 3D allowing to show the visual aspects, at the end of the test, of ZnMg Full PVD specimens, without layer 13 (FIG 3A) and with layer 13 (FIG 3B to 3D), after oiling Quaker 6130 tel as described above.
• the presence of the layer 13 can meet the requirements of French car manufacturers.
• a ZnMg Full PVD test tube without a layer 13 (Fig. 3E) after Fuchs oiling as described above does not meet the requirements of German car manufacturers, unlike a ZnMg Full PVD test tube with layer 13 ( Figure 3F) after Fuchs oiling such as described above.
• the coating 7 comprises only a layer 9 of approximately 10 ⁇ m in thickness and comprising approximately 3% by weight of magnesium, approximately 3.7% by weight of aluminum, the balance being zinc and the unavoidable impurities.
• the substrate 3 is then a cold rolled steel for deep drawing. These specimens will be designated ZnMgAI thereafter.
• the ZnMgAI test pieces were tested in the oiled state (Quaker 6130 film with a weight of about 1 g / m 2 ) and not oiled, with and without a layer 13. By comparison, the same tests were carried out on specimens from a standard galvanized sheet with a zinc coating 10 ⁇ thick and a cold-rolled steel substrate for deep drawing. These last test pieces will be designated Gl thereafter.
• the monitoring of the evolution of tarnishing during the test was carried out via a colorimeter measuring the luminance difference (measurement of AL * ).
• corresponding to the appearance of tarnishing was set at 2.
• the level of tarnishing achieved by the ZnMgAI test specimens with layer 13 is equivalent to that of the oiled Gl specimens.

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• Chemical Treatment Of Metals (AREA)
• Laminated Bodies (AREA)
• Other Surface Treatments For Metallic Materials (AREA)
• Prevention Of Electric Corrosion (AREA)
• Preventing Corrosion Or Incrustation Of Metals (AREA)

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