EP0873386B1 - Procede de traitement de la surface metallique d'une tole - Google Patents
Procede de traitement de la surface metallique d'une tole Download PDFInfo
- Publication number
- EP0873386B1 EP0873386B1 EP96942385A EP96942385A EP0873386B1 EP 0873386 B1 EP0873386 B1 EP 0873386B1 EP 96942385 A EP96942385 A EP 96942385A EP 96942385 A EP96942385 A EP 96942385A EP 0873386 B1 EP0873386 B1 EP 0873386B1
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- EP
- European Patent Office
- Prior art keywords
- sheet
- treatment
- oiling
- oil
- treatment product
- 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.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M173/00—Lubricating compositions containing more than 10% water
- C10M173/02—Lubricating compositions containing more than 10% water not containing mineral or fatty oils
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M107/00—Lubricating compositions characterised by the base-material being a macromolecular compound
- C10M107/20—Lubricating compositions characterised by the base-material being a macromolecular compound containing oxygen
- C10M107/30—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M107/32—Condensation polymers of aldehydes or ketones; Polyesters; Polyethers
- C10M107/34—Polyoxyalkylenes
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/02—Water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2209/00—Organic macromolecular compounds containing oxygen as ingredients in lubricant compositions
- C10M2209/10—Macromolecular compoundss obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C10M2209/103—Polyethers, i.e. containing di- or higher polyoxyalkylene groups
- C10M2209/104—Polyethers, i.e. containing di- or higher polyoxyalkylene groups of alkylene oxides containing two carbon atoms only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/04—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2215/042—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to acyclic or cycloaliphatic carbon atoms containing hydroxy groups; Alkoxylated derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2030/00—Specified physical or chemical properties which is improved by the additive characterising the lubricating composition, e.g. multifunctional additives
- C10N2030/12—Inhibition of corrosion, e.g. anti-rust agents or anti-corrosives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10N—INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATING COMPOSITIONS
- C10N2050/00—Form in which the lubricant is applied to the material being lubricated
- C10N2050/01—Emulsions, colloids, or micelles
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- 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
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31678—Of metal
- Y10T428/31692—Next to addition polymer from unsaturated monomers
Definitions
- the invention relates to a method for treating the metal surface. of a sheet, in particular of a steel sheet, intended to prepare said sheet for stamping and / or protecting it against corrosion, in which an aqueous solution of treatment product on said surface, dried said surface, then at least one operation of oiling said area.
- Patent EP 0 489 105 B1 - corresponding to WO 91/03334 - describes a process of the aforementioned type, including an oiling operation, in which the treatment product this time comprises an water-soluble salt of a metal alkaline, especially potassium phosphate.
- a solution is therefore applied to its surface potassium phosphate and then the applied solution is dried; conditions of application and drying are suitable for obtaining a phosphate deposit surface density between 5 to 40 mg / m2.
- the sheet thus treated is then ready to enter the setting tool shaped (for example a stamping press).
- Pre-treatment of the metal surface with a solution of phosphate therefore significantly improves its tribological properties.
- the preparation of a sheet for stamping comprises at least two operations, one to deposit a treatment product (phosphate), the other to oiling.
- a treatment product phosphate
- the sheets are stored, sometimes for an extended period, longer than a month; he must then consider, after depositing a treatment product, not a but two oiling operations.
- the sheets After storage, usually with this second oiling, or re-oiling lubrication, the sheets can therefore be stamped.
- the invention aims to limit these drawbacks while proposing a surface treatment offering both good corrosion resistance and good lubrication, even with a single oiling operation.
- Lanolin is a fatty substance of animal origin.
- the grease is itself after washing sheep's wool; grease is considered usually as a wax comprising mainly alcohol esters cholesterol-type fats, isocholesterol, lanosterol combined with acids saturated fat with a number of carbon atoms greater than 23.
- non-oil is understood to mean water-soluble a homogeneous oily phase as opposed, in particular, to aqueous emulsions of oil in water.
- HLB Hydrophilic Lipophilic Balance
- the subject of the invention is also a sheet metal, in particular a steel sheet, treated according to the invention, characterized in that its metallic surface is coated with two superimposed and separate layers, an intermediate layer containing said treatment product and a surface layer of oil.
- the thickness of said intermediate layer is less than 1 ⁇ m and its surface density is greater than 100 mg / m2.
- This time interval corresponds to a storage period during which the sheet treated according to the invention is effectively protected against corrosion by the double layer of treatment product and oil; it's this same double layer which is used to lubricate the sheet metal-stamping tool interface during the shaping operation at the end of the storage period.
- said time interval - or period of storage of the processed sheet - is more than a month.
- An aqueous solution of treatment product is prepared by dissolving lanosterol polyethoxylate in water, said polyethoxylate corresponding to the general formula DO- (CH2-CH2-O) n -H, D-OH representing lanosterol.
- Lanosterol because it is polyethoxylated, is easily soluble in water.
- lanosterol other sterol derivatives of lanolin, especially cholesterol or isocholesterol, or the corresponding derived esters, or mixtures of these derivatives.
- the number of "ethylene oxide” radicals per molecule of polyethoxylate product is between 30 and 150, in particular of the order of 75.
- the number of "ethylene oxide” radicals is adjusted by polyethoxylate product molecule so as to obtain a polyethoxylate with an HLB index at least equal to 14 (Hydrophilic-lipophilic balance - scale from 0.1 to 20).
- the concentration of polyethoxylates in the solution In a manner known per se, the concentration of polyethoxylates in the solution, the conditions of application of said solution on the sheet to be treated and the drying conditions to obtain a deposit of thickness less than 1 ⁇ m on the sheet.
- the surface density of the treatment product deposit is advantageously between 300 to 400 mg / m2.
- the treatment solution is easy to handle, to apply and dry on the sheet, since it is an aqueous solution.
- the concentration of polyethoxylates in the solution is between 0.5 and 10% by weight.
- the concentration of polyethoxylates in the solution of treatment is about 4%.
- a treated sheet is obtained, the treatment according to the invention comprising the deposition of an intermediate layer of lanosterol ethoxylates and a layer oil surface.
- aqueous solution one can proceed for example by soaking or spraying.
- hot air can be used.
- the deposition of lanosterol ethoxylate is considered to be in a state dry enough to oil and achieve the goals the invention when it no longer contains water of composition.
- Lanosterol ethoxylates are very hygroscopic: exposed to humid atmosphere, they can recover up to 100% of their weight in water within a fairly short time (in about ten minutes).
- This water uptake corresponds to adsorption water, as opposed to composition water.
- the drying should be conducted to remove all (or almost all) of the water from composition (i.e. water provided by the treatment product solution) but by necessarily so as to eliminate the adsorption water.
- the sheet is maintained at a temperature of at least 45 ° C, which facilitates the maintenance of the deposition of lanosterol ethoxylate in the dry state.
- the sheet treated according to the invention (dry deposition lanosterol ethoxylates + oiling) has much better properties tribological than a simply oiled sheet without surface treatment prior.
- the sheet thus treated dry deposition of lanosterol ethoxylates + oiling
- the sheet thus treated is as easy to degrease as a sheet treated according to the prior art (phosphate deposit + oiling).
- the protective oils that are generally used are not water-soluble and it is important, in the treatment according to the invention, to use precisely non-water-soluble oils, which excludes the use of emulsions oil in water.
- lanosterol ethoxylates according to the invention is therefore much more compatible with protective oils than art treatments previous, especially phosphate-based.
- the deposit lanosterol ethoxylates according to the invention therefore does not interfere with the protection brought by the oil.
- sheets treated according to the invention do not need to be re-oiled just before stamping, even after an extended storage period: we can therefore only carry out one single oiling operation between the output of sheet metal fabrication (for example, pickling outlet) and their shaping by stamping, and the sheet is protected against corrosion in the time interval between the single oiling operation of the actual stamping operation.
- this time interval is generally longer than a day and represents the storage period intermediate.
- tribological characteristics obtained on a sheet treated according to the invention are at least comparable to those obtained on a sheet directly oiled with an oil specially adapted for stamping (oil "high performance"), without prior deposition of lanosterol ethoxylates.
- the treatment according to the invention cannot be effective when using lubrication solutions or dispersions aqueous, the deposit of lanosterol ethoxylates then tending to be eliminated quickly by solubilization.
- the number of "ethylene oxide” radicals per product molecule polyethoxylate is high enough to prevent solubilization of the product in the oil, but should be kept low enough for the deposition in the dry state is not too hygroscopic.
- lanosterol is ethoxylated (number of "ethylene oxide” radicals too high) to the point of risking solubilization of oil in an aqueous phase (which would correspond to a function emulsifier).
- An additional advantage of the invention is that the diluted products in the treatment solution, namely polyethoxylates of derivatives of lanolin, do not present any risk to the environment or human health.
- sheets treated according to the invention can be easily spot welded.
- the sheets treated according to the invention could have a tendency to yellow slightly in surface, especially in the case where the intermediate dry deposition of ethoxylate contains adsorption water.
- the intermediate dry deposition of ethoxylate contains quantities significant adsorption water especially when not performing a very thorough drying (limited simply to the evaporation of water from composition), or when the deposit is allowed to adsorb water before oiling (case where the sheet is allowed to cool in a humid atmosphere before oiling).
- chelating or sequestering agents are added to the treatment product solution according to the invention, in particular with respect to iron ions (Fe 2+ , Fe 3+ ).
- the invention also applies to steel sheets coated with metal, like galvanized sheets.
- the invention also extends to cases where, in particular for the purpose to further improve the tribological properties, we perform a second oiling operation at the end of the storage period and just before stamping proper; in this case we will always avoid using water-soluble oils.
- the invention also extends to cases where, in particular for the purpose to further improve the corrosion resistance provided by the treatment according to the invention, at least one corrosion inhibitor is added to the solution of lanosterol ethoxylate treatment product.
- the treatment product thus deposited on the test piece before oiling represents a load of the order of 300 mg / m2, which in any case corresponds to a thin film with a thickness of less than 1 ⁇ m.
- oil film applied to the dry deposit of product treatment corresponds to a load of approximately 2 g / m2.
- the oiling is carried out directly after drying, which prevents the deposit from absorbing large quantities of water.
- the purpose of this example is to illustrate the improvement brought by the treatment of surface according to the invention on the coefficient of friction of said surface.
- This example also aims to illustrate that the performances tribological provided by the treatment according to the invention do not depend on the type of oil used (protective oil or stamping oil).
- test tubes After a possible deposit of treatment product (phosphate: P - lanosterol ethoxylates: X), the test tubes are oiled and the charge of applied oil is of the order of 2 g / m2.
- treatment product phosphate: P - lanosterol ethoxylates: X
- the test apparatus is a plane-plane tribometer of a type known per se.
- test pieces to be tested are clamped according to a clamping force F s between two high-speed steel plates offering a support (or sliding) surface on the test pieces of 1 cm 2 .
- the treatment according to the invention brings a very improvement sensitive tribological properties since the coefficient of friction of metal of the test piece is approximately divided by 2 compared to metal treated according to the prior art (phosphate deposit + oiling), and by 3 compared to metal directly oiled.
- coefficients of friction of the test specimens treated according to the invention are comparable, that one uses, for the operation of oiling, a protective oil or stamping oil, which shows that the tribological properties resulting from the treatment according to the invention are independent of the oil used.
- the purpose of this example is to illustrate a preferred embodiment of the invention that the average number m of ethylene oxide radicals in the molecule of the treatment product is between 30 and 150.
- Tribology tests are carried out according to the same procedure - test (1) - as in Example 1 (variable F s ) on two test pieces treated according to the invention X and X '(with so-called "protective" oiling: 80.21 QUAKER).
- the tribological properties obtained after treatment of the metal surface according to the invention depend on the average number m of ethylene oxide radicals in the molecule of the treatment product: tribological performances are lower for a too low value of m, while remaining superior to the treatments of the prior art for a value of m of the order of 30.
- the purpose of this example is to illustrate the stability of performance tribological provided by the treatment according to the invention, even after several weeks of storage.
- Example 1 The same tribological measurements - test (1) are carried out as in Example 1 (variable F s ), on the one hand immediately after the treatment, on the other hand 30 days after the treatment.
- the treatments are carried out using an oil of protection (QUAKER 80.21).
- the surface treatment according to the invention ensures an improvement tribological properties more stable over time than the treatments of prior art.
- the purpose of this example is to confirm, by stamping tests, the results given by tribological tests, in particular those of Example 1.
- the sheet metal blanks to be stamped are in grade 3C steel - extra mild steel for stamping - and have a thickness of 2 mm.
- the purpose of this example is to illustrate the advantage of processing surface according to the invention when simultaneously seeking to improve the tribological properties and to protect the treated sheet from corrosion.
- the climatic cycle to which the package of test specimens is subjected is the following: 10 h at 40 ° C and 95% humidity - 4 h at 20 ° C and 85% humidity - 10 h at -5 ° C and 0% humidity - 8h at 30 ° C and 85% humidity.
- test result - (1) or (2) - is obtained by observing the traces any corrosion of the specimens - pitting and / or staining - and classifying observations on a 5-point scale: 0 for lack of sting, 5 for generalized staining.
- test results are identified by depending on the number of days of exposure - test (1) - or the number of cycles climatic - test (2).
- Tests are carried out on several types of test pieces: oiled without prior deposit ("without"), processed according to the prior art (P), processed according to the invention (X).
- the treatment according to the invention provides a better protection against corrosion than a treatment of the prior art: a prior deposition of lanosterol ethoxylate degrades resistance to corrosion brought by the oil layer that a phosphate deposit of potassium.
- This example aims to illustrate the improvement of properties tribological that is obtained through the treatment according to the invention applied to coated steel sheets.
- This example is also intended to illustrate the impact of the concentration of ethoxylates in the treatment solution according to the invention on improving tribological properties.
- This example finally aims to illustrate the tribological performances which is obtained on a surface treated with a lanosterol ethoxylate solution, dried but not oiled.
- the example here concerns galvanized steel sheets by electrodeposition.
- Protocol Deposit concentration of ethoxylate in the treatment solution. Oiling after deposit. (QUAKER 6130 oil) AT No prior deposit. Yes B 4% by weight. Yes VS 10% by weight. Yes D 10% by weight.
- Curves A, B, C and D in Figure 7 correspond to the results of the tribological tests respectively for type A, B, C and D specimens.
- Example 1 (variable F s ), with the difference that the clamping force remains in the interval 80 - 800 daN.
- Curve D shows that good properties are also obtained tribological even if one does not oil after the deposition of ethoxylate.
- the purpose of this example is to illustrate the impact of the surface density of dry deposition of lanosterol ethoxylate according to the invention on the properties tribological.
- B, C, D treated according to the invention deposition of lanosterol ethoxylate + oiling QUAKER 80.21, the types of test pieces differing in density surface area of lanosterol ethoxylate.
- the tribological performances are measured according to the test procedure (1).
- Curves A, B, C and D in Figure 8 correspond to the results of the tribological tests respectively for type A, B, C and D specimens.
- the purpose of this example is to illustrate the impact of agent addition sequestering agent (iron ions) in the treatment product solution according to the invention on the elimination of the risks of yellowing of the treated sheets according to the invention.
- HEDTA-Na 3 hydroxy-ethyl-ethylene-diamine-acetic acid
- Test pieces are prepared according to the protocol defined in the preamble of the examples, by adding, in the treatment product solution, this agent sequestering at different concentrations.
- test pieces treated according to the invention are then subjected to exposure to sunlight during the same period, after which we measure their yellowing or "yellow index", by a method colorimetric known in itself.
- the yellow index is deduced from the coordinates trichromatics measured in the CIE-LAB colorimetry scale using a LMG 083 colorimeter from the company "Microcolor Do Budapest Lange".
- the purpose of this example is to illustrate the importance of drying (after application of the treatment product solution) to obtain good tribological properties.
- Two samples S1, S2 are prepared, treated according to the modality X of the invention (previously defined), oiled in the same way.
Description
- la surface traitée présente une bonne emboutissabilité, comparable à celle d'autres traitements, notamment lorsque que la solution de traitement contient également un agent plastifiant comme un sel métallique d'acide stéarique,
- mais surtout, que cette surface traitée est facilement dégraissable, puis phosphatable dans des conditions de nature à améliorer l'adhérence d'un film époxy appliqué sur cette surface.
- au moins deux opérations (dépôt d'un produit de traitement à base de phosphate + huilage), sinon trois en cas de stockage (re-huilage après stockage).
- une dégradation de la résistance à la corrosion apportée par le huilage de protection, lorsqu'on a procédé, avant ce huilage, à un dépôt d'un produit de traitement, ce qui traduit un problème de compatibilité entre la couche de produit de traitement déposée pour améliorer les propriétés tribologiques et la couche d'huile déposée pour protéger contre la corrosion.
- un manque de stabilité dans le temps des améliorations tribologiques apportées par un dépôt préalable de produit de traitement, notamment à base de phosphate : ainsi les tôles stockées longtemps sont plus difficiles à emboutir.
- le produit de traitement contient des polyéthoxylats d'un ou plusieurs dérivés de la lanoline, lesdits dérivés étant des stérols ou des esters d'alcool gras,
- les conditions de séchage sont adaptées pour obtenir un dépôt à l'état sec de produit de traitement sur ladite surface, ledit dépôt étant considéré comme étant à l'état sec s'il ne contient plus ou quasiment plus d'eau de composition,
- et l'au moins une opération de huilage est réalisée en appliquant une huile non aquasoluble sur ledit dépôt toujours à l'état sec.
- lesdits dérivés de la lanoline sont choisis parmi les alcools gras comme le lanostérol, le cholestérol, l'isocholestérol et les acides gras et esters dérivés de la lanoline.
- si lesdits polyéthoxylats répondent à la formule générale D-O-(CH2-CH2-O)n-H, n est compris entre 30 et 150, et vaut de préférence environ 75 ou n est choisi de manière à ce que lesdits polyéthoxylats présentent une balance hydrophile-lipophile (couramment appelé HLB) au moins égale à 14 (dans une échelle comprise entre 0,1 et 20).
- ledit dépôt à l'état sec présente, sur ladite surface, une densité surfacique comprise entre 100 et 400 mg/m2.
- ladite solution aqueuse de produit de traitement contient au moins un agent séquestrant vis à vis des ions du fer.
- on effectue une seule dite opération de huilage avant la mise en forme,
- l'intervalle de temps séparant ladite unique opération de huilage de l'opération d'emboutissage à proprement parler est supérieur à une journée.
- les figures 1 à 3 représentent des courbes A, B, C de résultats d'essais tribologiques pour différentes éprouvettes, avec, en ordonnée le coefficient de frottement k (de 0 à 0,3), et en abscisse, la force de serrage Fs (exprimée en décaNewton - daN - de 200 à 2000 daN par intervalles de 360 daN) pour les figures 1 et 3 ou la course de frottement D (exprimée en mm - de 0 à 180 mm) pour la figure 2.
- les figures 4, 5 et 6 représentent, chacune pour un type d'éprouvette, des résultats d'essais tribologiques immédiatement après traitement (A) et 30 jours après traitement (B), avec, en ordonnée le coefficient de frottement k (de 0 à 0,3), et en abscisse, la force de serrage Fs (exprimée en décaNewton - daN - de 200 à 2000 daN).
- la figure 7 représente des résultats d'essais tribologiques sur des éprouvettes en acier zingué traitées suivants différents protocoles (courbes A à D), avec, en ordonnée, le coefficient de frottement k (de 0 à 0,3) et, en abscisse, la force de serrage Fs (exprimée en décaNewton - daN - de 80 à 800 daN par intervalles de 144 daN).
- la figure 8 représente des résultats d'essais tribologiques sur des éprouvettes en acier traitées suivant l'invention pour différentes densités surfaciques de dépôt préalable d'éthoxylat (courbes A à D), avec, en ordonnée, le coefficient de frottement k (de 0 à 0,3) et, en abscisse, la force de serrage Fs (exprimée en décaNewton - daN - de 200 à 2000 daN).
- la figure 9 représente des résultats d'essais tribologiques selon les mêmes conventions que la figure 8, la courbe S1 sur un échantillon dont le dépôt préalable n'a pas été séché selon l'invention, la courbe S2 sur un échantillon dont le dépôt préalable a été séché selon l'invention.
- on applique la solution aqueuse de traitement sur la surface métallique de la tôle à traiter,
- puis on sèche la solution appliquée,
- et on applique alors sur la tôle une huile de lubrification connue en elle-même, adaptée à l'emboutissage.
- soit, selon l'invention, des polyéthoxylats de lanostérol présentant un nombre moyen m de radicaux d'oxyde d'éthylène. X désigne le produit pour lequel m=75 et le traitement de surface associé (application de la solution de traitement + séchage).X' désigne le produit pour lequel m=30 et le traitement de surface associé (application + séchage) ; l'indice HLB du produit X' vaut environ 14 dans une échelle de 0,1 à 20, 0,1 correspondant à un produit très lipophile et 20 correspondant à un produit très hydrophile.
- soit, pour comparaison avec l'art antérieur, du phosphate de potassium désigné par P, P désignant aussi le traitement de surface associé (application + séchage). Le dépôt de produit de traitement est effectué dans les conditions de séchage mentionnées précédemment dans la description générale de l'invention, c'est à dire que l'on sèche au moins jusqu'à évaporer sensiblement toute l'eau de composition présente dans la couche de solution de traitement appliquée sur l'éprouvette.
- soit une huile de protection : on prend une huile référencée 80.21 de la Société QUAKER.
- soit une huile d'emboutissage : on prend une huile référencée V14 de la Société FUCHS.
- test (1) : en augmentant progressivement la force de serrage Fs .
- test (2) : en maintenant constante la force de serrage Fs = 1800 daN.
- à chaque figure, A, B, C désignent les courbes respectivement (A) pour une éprouvette sans traitement, (B) pour une éprouvette avec un traitement P et (C) pour une éprouvette avec un traitement X selon l'invention.
- les figures 1 et 2 correspondent à des test d'échantillons huilés à l'aide d'une huile de protection (80.21 de QUAKER), la figure 3 à des tests d'échantillons huilés à l'aide d'une huile d'emboutissage (V14 de FUCHS).
Force de serrage maximum à l'emboutissage | |||
Nature du traitement : | sans | P | X |
Force de serrage critique (kN) | 70 | 150 | 190 |
- test (1) de corrosion atmosphérique : on expose l'éprouvette à l'atmosphère.
- test (2) de corrosion en enceinte climatique : les éprouvettes sont placées en enceinte en paquet serré, ce qui simule les conditions auxquelles est soumise une tôle bobinée pendant une opération de transport.
Protocole | Dépôt : concentration en éthoxylat dans la solution de traitement. | Huilage après dépôt. (Huile QUAKER 6130) |
A | Pas de dépôt préalable. | oui |
B | 4% en poids. | oui |
C | 10% en poids. | oui |
D | 10% en poids. | NON |
influence de la densité de dépôt préalable. | ||
Protocole | Dépôt : éthoxylat lanostérol. Densité de surface | Coefficient de frottement k à FS = 1800 daN. |
A | 300 mg/m2. | 0,075 |
B | 380 mg/m2. | 0,055 |
C | 470 mg/m2. | 0,050 |
D | 660 mg/m2. | 0,045 |
- SI est séché seulement 2 minutes à température ambiante de telle sorte que le dépôt (de produit de traitement - non sec) représente 1,2 g/m2.
- S2 est séché pendant 12 minutes à température ambiante de telle sorte que le dépôt (de produit de traitement - sec) représente 0,8 g/m2.
- pour S1 (non séché) : k = 0,11
- pour S2 (séché selon l'invention) : k = 0,05
Claims (8)
- Procédé de traitement de la surface métallique d'une tôle, notamment d'une tôle d'acier, destiné à préparer ladite tôle à l'emboutissage et/ou à la protéger contre la corrosion, dans lequel on applique une solution aqueuse de produit de traitement sur ladite surface, on sèche ladite surface, puis on effectue au moins une opération de huilage de ladite surface, caractérisé en ce que :le produit de traitement contient des polyéthoxylats d'un ou plusieurs dérivés de la lanoline, lesdits dérivés étant des stérols ou des esters d'alcool gras,si lesdits polyéthoxylats répondent à la formule générale D-O-(CH2-CH2-O)n-H , n remplit au moins l'une des conditions suivantes :les conditions de séchage sont adaptées pour obtenir un dépôt à l'état sec de produit de traitement, quasiment dépourvu d'eau de composition,et l'au moins une opération de huilage est réalisée en appliquant une huile non aquasoluble sur ledit dépôt à l'état sec.
- Procédé selon la revendication 1 caractérisé en ce que lesdits dérivés de la lanoline sont choisis parmi les alcools gras comme le lanostérol, le cholestérol, l'isocholestérol et les acides gras et esters dérivés de la lanoline.
- Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que ledit dépôt à l'état sec présente, sur ladite surface, une densité surfacique comprise entre 100 et 400 mg/m2.
- Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que ladite solution aqueuse de produit de traitement contient au moins un agent séquestrant vis à vis des ions du fer.
- Tôle, notamment tôle d'acier, traitée selon l'une quelconque des revendications précédentes caractérisée en ce que sa surface métallique est revêtue de deux couches superposées et distinctes, une couche intermédiaire contenant ledit produit de traitement et une couche superficielle d'huile.
- Tôle selon la revendication 5 caractérisée en ce que l'épaisseur de ladite couche intermédiaire est inférieure à 1 µm et en ce que la densité surfacique de cette couche intermédiaire est supérieure à 100 mg/m2.
- Procédé d'emboutissage d'une tôle métallique, notamment d'acier, dans lequel on prépare ladite tôle par un procédé selon l'une quelconque des revendications 1 à 4 puis on emboutit à proprement parler ladite tôle pour la mettre en forme, caractérisé en ce que :on effectue une seule dite opération de huilage avant la mise en forme,l'intervalle de temps séparant ladite unique opération de huilage de l'opération d'emboutissage à proprement parler est supérieur à une journée.
- Procédé d'emboutissage selon la revendication 7 caractérisé en ce que ledit intervalle de temps est supérieur à un mois.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9514834A FR2742364B1 (fr) | 1995-12-14 | 1995-12-14 | Procede de traitement de surface d'une tole metallique pour emboutissage |
FR9514834 | 1995-12-14 | ||
PCT/FR1996/001979 WO1997021793A1 (fr) | 1995-12-14 | 1996-12-11 | Procede de traitement de la surface metallique d'une tole |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0873386A1 EP0873386A1 (fr) | 1998-10-28 |
EP0873386B1 true EP0873386B1 (fr) | 2001-03-21 |
Family
ID=9485505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP96942385A Expired - Lifetime EP0873386B1 (fr) | 1995-12-14 | 1996-12-11 | Procede de traitement de la surface metallique d'une tole |
Country Status (8)
Country | Link |
---|---|
US (1) | US5997955A (fr) |
EP (1) | EP0873386B1 (fr) |
AT (1) | ATE199931T1 (fr) |
CA (1) | CA2238840C (fr) |
DE (1) | DE69612217T2 (fr) |
ES (1) | ES2156304T3 (fr) |
FR (1) | FR2742364B1 (fr) |
WO (1) | WO1997021793A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2767140B1 (fr) * | 1997-08-07 | 1999-10-29 | Lorraine Laminage | Procede de traitement de surface de pieces metalliques |
FR2787355B1 (fr) * | 1998-12-22 | 2002-01-18 | Lorraine Laminage | Procede de traitement de surfaces metalliques, notamment de toles d'acier, destine en particulier a ameliorer leurs performances tribologiques |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB380431A (en) * | 1931-04-10 | 1932-09-12 | James Yate Johnson | Improvements in the manufacture and production of assistants in the textile and related industries and dispersing agents |
US2578585A (en) * | 1949-08-11 | 1951-12-11 | Gilron Products Company | Composition for forming a dry, homogeneous, self-adherent lubricating film on metal stock |
GB774511A (en) * | 1952-07-24 | 1957-05-08 | Textile Oils Ltd | Improvements in and relating to the lubrication of textile fibres and textile processing machinery and the manufacture of lubricants suitable therefor |
FR1259134A (fr) * | 1959-05-22 | 1961-04-21 | Lubrifiant pour le travail des métaux | |
US3873458A (en) * | 1973-05-18 | 1975-03-25 | United States Steel Corp | Resin-containing lubricant coatings |
DE2341577B1 (de) * | 1973-08-17 | 1974-12-05 | Texaco Ag | Hochleistungsziehoel |
US4787995A (en) * | 1985-05-03 | 1988-11-29 | Chem-Trend, Incorporated | Lanolin containing metalworking fluids and concentrates |
US4752405A (en) * | 1986-05-01 | 1988-06-21 | Coral Chemical Company | Metal working lubricant |
JPS6388085A (ja) * | 1986-10-02 | 1988-04-19 | Toyo Kohan Co Ltd | めつき鋼板の後処理方法 |
US4859351A (en) * | 1987-06-01 | 1989-08-22 | Henkel Corporation | Lubricant and surface conditioner for formed metal surfaces |
JPH01290778A (ja) * | 1988-05-19 | 1989-11-22 | Toyo Kohan Co Ltd | めっき鋼板の後処理方法 |
US5011711A (en) * | 1989-07-18 | 1991-04-30 | Toyo Kohan Co., Ltd. | Method for post-treatment of electroplated steel sheets for soldering |
FR2651700B1 (fr) * | 1989-09-11 | 1994-10-14 | Lorraine Laminage | Procede d'emboutissage d'un flan de tole metallique. |
JP3092423B2 (ja) * | 1993-12-01 | 2000-09-25 | 株式会社コスモ総合研究所 | 新規塑性加工コート剤組成物 |
JPH0848937A (ja) * | 1994-08-04 | 1996-02-20 | Cosmo Oil Co Ltd | 新規塑性加工コート剤組成物 |
-
1995
- 1995-12-14 FR FR9514834A patent/FR2742364B1/fr not_active Expired - Fee Related
-
1996
- 1996-12-11 DE DE1996612217 patent/DE69612217T2/de not_active Expired - Lifetime
- 1996-12-11 EP EP96942385A patent/EP0873386B1/fr not_active Expired - Lifetime
- 1996-12-11 CA CA 2238840 patent/CA2238840C/fr not_active Expired - Fee Related
- 1996-12-11 ES ES96942385T patent/ES2156304T3/es not_active Expired - Lifetime
- 1996-12-11 US US09/091,232 patent/US5997955A/en not_active Expired - Lifetime
- 1996-12-11 WO PCT/FR1996/001979 patent/WO1997021793A1/fr active IP Right Grant
- 1996-12-11 AT AT96942385T patent/ATE199931T1/de active
Also Published As
Publication number | Publication date |
---|---|
FR2742364A1 (fr) | 1997-06-20 |
CA2238840C (fr) | 2007-03-20 |
WO1997021793A1 (fr) | 1997-06-19 |
ATE199931T1 (de) | 2001-04-15 |
CA2238840A1 (fr) | 1997-06-19 |
US5997955A (en) | 1999-12-07 |
DE69612217T2 (de) | 2001-11-15 |
FR2742364B1 (fr) | 1998-01-09 |
ES2156304T3 (es) | 2001-06-16 |
DE69612217D1 (de) | 2001-04-26 |
EP0873386A1 (fr) | 1998-10-28 |
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