EP0686212A1 - Method of manufacture of a metal part coated with mineral materials, part obtained and use thereof - Google Patents

Method of manufacture of a metal part coated with mineral materials, part obtained and use thereof

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Publication number
EP0686212A1
EP0686212A1 EP94907607A EP94907607A EP0686212A1 EP 0686212 A1 EP0686212 A1 EP 0686212A1 EP 94907607 A EP94907607 A EP 94907607A EP 94907607 A EP94907607 A EP 94907607A EP 0686212 A1 EP0686212 A1 EP 0686212A1
Authority
EP
European Patent Office
Prior art keywords
coating
layer
less
produced
mineral material
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.)
Granted
Application number
EP94907607A
Other languages
German (de)
French (fr)
Other versions
EP0686212B1 (en
Inventor
Didier Perrin
Stéphane EBALARD
Pierre Genelot
Simone Rey
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.)
Pont a Mousson SA
Original Assignee
Pont a Mousson SA
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Filing date
Publication date
Application filed by Pont a Mousson SA filed Critical Pont a Mousson SA
Publication of EP0686212A1 publication Critical patent/EP0686212A1/en
Application granted granted Critical
Publication of EP0686212B1 publication Critical patent/EP0686212B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/044—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material coatings specially adapted for cutting tools or wear applications
    • 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
    • C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
    • C23C28/04—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material
    • C23C28/048—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D only coatings of inorganic non-metallic material with layers graded in composition or physical properties
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers

Definitions

  • the present invention relates to the manufacture of a metal part coated with mineral materials.
  • the invention relates to the manufacture of a metal part coated with a mineral coating based on silica and sodium oxide.
  • the mineral coating constitutes an effective protection of the metal part and has good chemical inertness with respect to a fluid in contact with it.
  • the object of the invention is to obtain a metal part whose coating which provides a protective role and chemical inertness, is adhered to the substrate, and has few open porosities so as to form a passive barrier between the fluid and the substrate.
  • the first coating layer must be sufficiently covering to form an antioxidant film and said layer must be thin enough to allow degassing and decantation of the gas bubbles resulting from the reaction between the first layer and the metal.
  • a first coating layer with a thickness of less than 200 ⁇ m is produced.
  • the production of the first coating layer is carried out by application of the mineral material in powder form, in particular a dry powder. .
  • the fluidity of the mineral material must be adapted to ensure a fusion of the powder, necessary for coating the substrate and for adhesion to the substrate, and for limiting the chemical reactions between the substrate and the first coating layer.
  • a reducing substrate such as cast iron
  • a first layer of oxidizing coating present a risk of redox reaction with degassing and appearance of blisters.
  • a composition that is too fluid can cause a flow of the coating, with the defects that would follow, loss of the covering appearance and oxidation of the substrate.
  • An insufficiently fluid composition will not allow good melting of the powder, and therefore a lack of adhesion and poor coverage, hence a risk of oxidation of the substrate.
  • Oxidation of the substrate is particularly marked during heat treatments at high temperature.
  • the fluidity of the composition largely depends on the silica content and the content of fluxes.
  • the mineral material applied to form the first coating layer is an enamel having the following composition by weight:
  • the first coating layer with a thickness of 100 ⁇ m is produced.
  • the second coating layer is produced by applying the mineral material in the form of dry powder.
  • the second coating layer is produced by applying a slip of the mineral material.
  • the slip is a very fluid mixture of finely ground mineral material and water with various adjuvants such as antioxidants and suspending agents.
  • the second coating layer of mineral material In order to absorb the first coating layer, to dissolve the skin of iron oxides formed on the surface of the metal substrate, when the latter consists of a ferrous metal, and to cause a surface attack on the substrate, the second coating layer of mineral material by application of said mineral material which is an enamel of the following composition by weight:
  • the second coating layer is produced at a thickness greater than 100 ⁇ m. To prevent the second coating layer from being too porous, it is produced at a thickness of 200 ⁇ m.
  • a coating is produced on the surface of the part of revolution by application.
  • the third layer is produced by applying an enamel having the following composition by weight:
  • the third layer is produced at a thickness greater than 100 ⁇ m. In order to obtain a good fusion on deposit, the third layer is produced at a thickness of 200 ⁇ m.
  • the manufacture of tubular cast iron parts coated with glass is known (see for example document FR-2 297 817 in the name of the Applicant).
  • This process makes it possible to deposit the coating during the manufacture of the metallic piece of revolution and to take advantage of the thermal energy of the metal to achieve the melting of the first layer.
  • the subject of the invention is also a hollow metal part of revolution, coated on the internal part of its surface with mineral materials, this part being manufactured in accordance with the method described above.
  • the invention makes it possible to transport aggressive fluids without the characteristics of these fluids being altered or the hollow part of revolution being deteriorated.
  • the invention also relates to the use of the part obtained according to the process defined above for the transport of aggressive fluids.
  • the present invention is represented by an exemplary implementation applied to an element of water supply or sanitation piping in ductile iron, illustrated by appended figures, in which: - Fig. 1 shows in perspective a pipe element obtained -i according to the method of one invention;
  • - Fig. 2 is a micrograph at 100 magnification of the enamel coating with the joint area of the cast iron substrate of the piping element shown in FIG. 1.
  • the liquid iron undergoes a magnesium treatment then an inoculation.
  • the inoculation of the cast iron is carried out using an inoculant such as ferro-silicon introduced into the liquid cast iron in the form of powder or wire, in known manner, for example the document FR-A-2 546 783 in the name of the Applicant.
  • the method includes an operation of centrifuging the cast iron. During the centrifugation operation, the first layer 4 of coating 2 is produced at a thickness of 100 ⁇ m, by application of a reduced enamel of the following composition:
  • the pipe element 1 After the centrifugation operation, the pipe element 1 is graphitized. Then, the second coating layer 5 2 is produced at a thickness of 200 ⁇ m, by applying an enamel in powder form, said enamel being of the following composition by weight: Si0 2 balance CaO + MgO 0.5% Li 2 0 4%
  • the second coating layer 5 is applied to the piping element 1 at a temperature between 800 ° and 700 ° C.
  • the piping element 1 is ferritized in a temperature range of less than 800 ° C., which ensures the baking of the second coating layer 2.
  • the third coating layer 6 is produced with a thickness of 200 ⁇ m by application of enamel in the form of powder of composition identical to the composition of the enamel of the second layer 5 of coating 2 presented above. This powder is deposited on the pipe element 1 at a temperature below 800 ° C.
  • the third layer is glazed, that is to say a firing of a duration of less than five minutes at a temperature between 750 ° C and 700 ° C.
  • the cast iron obtained after centrifugation is a gray perlitic cast iron with spheroidal graphite.
  • the process then differs from that described above in that there is no graphitization of the piping element 1.
  • the second coating layer 5 during or after the centrifugation operation, by depositing the enamel in the form of a dry powder.
  • the pipe element is subsequently subjected to a ferritization treatment in a temperature range of less than 800 ° C., and the baking of the second layer 5 coating 2 takes place simultaneously with the ferritization of the piping element 1.
  • the cast iron obtained after centrifugation is a gray ferritic cast iron with spheroidal graphite.
  • the method then differs from the method of the first variant in that there is no ferritization of the piping element 1 and that the second coating layer 5 of coating 2 is baked at a temperature included between 800 ° and 700 ° C of said element 1 after the application of the second coating layer 5 2.
  • the method differs from that initially described in that the enamel is deposited in the form of a slip to produce the second layer 5 of coating 2, after graphitization and while the pipe element 1 is at room temperature.
  • the method differs from the first variant in that the enamel is deposited in the form of a slip after centrifugation and while the piping element is at ambient temperature.
  • the third enamel layer is deposited in the form of a slip while the pipe element 1 is at ambient temperature.
  • the pipe element 1 obtainable by the process according to the invention, including the five variants described above, is a ductile iron pipe 3 having on the internal part of its surface a coating 2 of enamel consisting of three layers 4, 5, 6.
  • This pipe has at one end a plain end 8 and at its other end a socket 7 adapted to receive the plain end of another identical pipe.
  • the micrograph of the enamel coating 2 on a joint area of the cast iron substrate represents the substrate, the interface between the substrate 3 and the coating 2, the second layer 5 of coating 2 and the third layer 6 coating 2.
  • the substrate 3 is a ferritic cast iron with spheroidal graphite. At the level of the interface between the substrate and the coating, the oxide skin was dissolved.
  • the first coating layer 4 2 has been absorbed by the second coating layer 5 2.
  • the interface between the coating and the cast iron substrate 3 is consistent, and has few porosities. The localized surface attack of the substrate leads to the formation of anchoring sites for the coating 2.
  • the second layer 5 has a limited porosity.
  • the third coating layer 6 2 does not show any decohesion with the second coating layer 5 2. It has a very low porosity, forms a smooth surface and achieves very good closure of the coating.
  • the method according to the invention makes it possible to coat even oxidized metal parts which have an adherent oxide skin with a thickness of less than 20 ⁇ m.
  • the invention allows a gain in productivity and in thermal energy.
  • the invention makes it possible to eliminate one or more specific stages of firing the enamel.
  • Variants of the process in which the application of the enamel is in the form of a slip make it possible to obtain great flexibility in production.
  • the pipes obtained make it possible to carry out transport lines for aggressive fluids, such as acid solutions, solutions with a high content of dissolved C0 2 , abrasive fluids, industrial discharges, waste water or sewage sludge.
  • aggressive fluids such as acid solutions, solutions with a high content of dissolved C0 2 , abrasive fluids, industrial discharges, waste water or sewage sludge.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Glass Compositions (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
  • Silicates, Zeolites, And Molecular Sieves (AREA)
  • Laminated Bodies (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Chemically Coating (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

Method of manufacture of a metal part (1) coated with several layers (4, 5, 6) of mineral materials, said method allowing some oxidation of the metal part's surface. The invention also concerns a hollow revolving part manufactured according to the above-mentioned method. The manufacture of the hollow revolving part comprises the following stages wherein a liquid casting is subjected to: a treatment using magnesium, an inoculation process and a centrifugal operation during which the first layer (4) of the coating (2) is applied to the metal part. The metal part of the invention is for use in the transport of aggressive fluids.

Description

Procédé de fabrication d'une pièce métallique revêtue de matériaux minéraux, oiècp nht.pnue et. son utilisation. Method of manufacturing a metal part coated with mineral materials, oiècp nht.pnue et. its use.
La présente invention est relative à la fabrication d'une pièce métallique revêtue de matériaux minéraux. En particulier, l'invention se rapporte à la fabrication d'une pièce métallique revêtue d'un revêtement minéral à base de silice et d'oxyde de sodium.The present invention relates to the manufacture of a metal part coated with mineral materials. In particular, the invention relates to the manufacture of a metal part coated with a mineral coating based on silica and sodium oxide.
La fabrication d'objets en fonte revêtus de verre est connue (voir par exemple le document FR- 495 190).The manufacture of glass-coated cast iron objects is known (see for example document FR-495,190).
Le revêtement minéral constitue une protection efficace de la pièce métallique et présente une bonne inertie chimique vis à vis d'un fluide à son contact.The mineral coating constitutes an effective protection of the metal part and has good chemical inertness with respect to a fluid in contact with it.
L'invention a pour but d'obtenir une pièce métallique dont le revêtement qui assure un rôle protecteur et une inertie chimique, est adhèrent au substrat, et présente peu de porosités ouvertes de façon à former une barrière passive entre le fluide et le substrat.The object of the invention is to obtain a metal part whose coating which provides a protective role and chemical inertness, is adhered to the substrate, and has few open porosities so as to form a passive barrier between the fluid and the substrate.
Pour diminuer la porosité et améliorer l'adhérence du revêtement minéral sur le substrat métallique et pour assurer une très bonne fermeture du revêtement de manière à protéger le substrat de la corrosion, on applique successivement plusieurs couches dudit revêtement minéral sur au moins une partie de la surface de la pièce métallique. Les éléments de matériau minéral sont présents dans des variations de proportion différentes suivant les couches. La première couche de revêtement doit être suffisamment couvrante pour former une pellicule antioxydante et ladite couche doit être assez mince pour permettre le dégazage et la décantation des bulles de gaz provenant de la réaction entre la première couche et le métal.To reduce the porosity and improve the adhesion of the mineral coating to the metal substrate and to ensure very good closure of the coating so as to protect the substrate from corrosion, several layers of said mineral coating are successively applied to at least part of the surface of the metal part. The elements of mineral material are present in variations of different proportion according to the layers. The first coating layer must be sufficiently covering to form an antioxidant film and said layer must be thin enough to allow degassing and decantation of the gas bubbles resulting from the reaction between the first layer and the metal.
On réalise une première couche de revêtement d'une épaisseur inférieure à 200μm.A first coating layer with a thickness of less than 200 μm is produced.
Afin de réaliser le revêtement au moins en partie pendant que le métal est à une température élevée supérieure à 700°C, la réalisation de la première couche de revêtement s'effectue par application du matériau minéral sous forme de poudre, en particulier une poudre sèche. Lors de la réalisation de la première couche de revêtement, la fluidité du matériau minéral doit être adaptée pour assurer une fusion de la poudre, nécessaire à un nappage du substrat et à une adhérence au substrat, et pour limiter les réactions chimiques entre le substrat et la première couche de revêtement.In order to carry out the coating at least in part while the metal is at an elevated temperature above 700 ° C., the production of the first coating layer is carried out by application of the mineral material in powder form, in particular a dry powder. . During the production of the first coating layer, the fluidity of the mineral material must be adapted to ensure a fusion of the powder, necessary for coating the substrate and for adhesion to the substrate, and for limiting the chemical reactions between the substrate and the first coating layer.
Un substrat réducteur, tel que de l fonte, et une première couche de revêtement oxydante présentent un risque de réaction d'oxydoréduction avec dégazage et apparition de boursouflures.A reducing substrate, such as cast iron, and a first layer of oxidizing coating present a risk of redox reaction with degassing and appearance of blisters.
Une composition trop fluide peut provoquer un écoulement du revêtement, avec les défauts qui en suivraient, perte de l'aspect couvrant et oxydation du substrat. Une composition insuffisamment fluide ne permettra pas une bonne fusion de la poudre, et par conséquent un défaut d'adhérence et une mauvaise couverture, d'où un risque d'oxydation du substrat.A composition that is too fluid can cause a flow of the coating, with the defects that would follow, loss of the covering appearance and oxidation of the substrate. An insufficiently fluid composition will not allow good melting of the powder, and therefore a lack of adhesion and poor coverage, hence a risk of oxidation of the substrate.
L'oxydation du substrat est particulièrement marquée lors de traitements thermiques à température élevée.Oxidation of the substrate is particularly marked during heat treatments at high temperature.
La fluidité de la composition dépend largement de la teneur en silice et de la teneur en fondants.The fluidity of the composition largely depends on the silica content and the content of fluxes.
Afin que le matériau présente la fluidité requise, le matériau minéral appliqué pour former la première couche de revêtement est un émail ayant la composition suivante en poids :In order for the material to have the required fluidity, the mineral material applied to form the first coating layer is an enamel having the following composition by weight:
Si02 50 à 70 %Si0 2 50 to 70%
CaO + MgO 5 à 20 % B2O3 moins de 10 % CoO moins de 2 %CaO + MgO 5 to 20% B2O3 less than 10% CoO less than 2%
Fe2C>3 moins de 5 % AI2O3 moins de 10 % Na20 + K20 15 à 25 % F2 moins de 2 % NiO moins de 2 % Pour limiter les réactions d'oxydoréduction entre le revêtement et le substrat, le matériau minéral est réduit lors de son élaboration.Fe 2 C> 3 less than 5% AI2O3 less than 10% Na 2 0 + K 2 0 15 to 25% F 2 less than 2% NiO less than 2% In order to limit the redox reactions between the coating and the substrate, the mineral material is reduced during its preparation.
Afin de permettre la fusion de la poudre, pour un bon nappage et une bonne adhérence, on réalise la première couche de revêtement d'épaisseur de 100μm.In order to allow the powder to melt, for a good coating and good adhesion, the first coating layer with a thickness of 100 μm is produced.
Pour déposer le matériau minéral sur une pièce chaude, la réalisation de la deuxième couche de revêtement s'effectue par 1'application du matériau minéral sous forme de poudre sèche.To deposit the mineral material on a hot part, the second coating layer is produced by applying the mineral material in the form of dry powder.
Pour déposer le matériau minéral sur une pièce à température ambiante, la réalisation de la deuxième couche de revêtement s'effectue par application d'une barbotine du matériau minéral. La barbotine est un mélange très fluide de matériau minéral finement broyé et d'eau avec divers adjuvants tels que des antioxydants et des agents de suspension.To deposit the mineral material on a part at room temperature, the second coating layer is produced by applying a slip of the mineral material. The slip is a very fluid mixture of finely ground mineral material and water with various adjuvants such as antioxidants and suspending agents.
De manière à absorber la première couche de revêtement, à dissoudre la peau d'oxydes de fer formée à la surface du substrat métallique, lorsque celui-ci est constitué d'un métal ferreux, et à provoquer une attaque superficielle du substrat, on réalise la deuxième couche de revêtement en matériau minéral par application dudit matériau minéral qui est un émail de la composition suivante en poids :In order to absorb the first coating layer, to dissolve the skin of iron oxides formed on the surface of the metal substrate, when the latter consists of a ferrous metal, and to cause a surface attack on the substrate, the second coating layer of mineral material by application of said mineral material which is an enamel of the following composition by weight:
Si02 40 à 60% ;Si0 2 40 to 60%;
CaO + MgO inférieur à 5%CaO + MgO less than 5%
Li20 inférieur à 5%Li 2 0 less than 5%
Ti02 5 à 15% N NiiOO inférieur à 2%Ti0 2 5 to 15% N NiiOO less than 2%
ZnO inférieur à 2%ZnO less than 2%
A1203 inférieur à 10%A1 2 0 3 less than 10%
Na 0 + K20 15 à 20%Na 0 + K 2 0 15 to 20%
B2°3 5 à 15% C CooOO inférieur à 2% sb2o3 inférieur à 2% Afin d'obtenir une bonne adhérence du revêtement, par absorption, dissolution et attaque superficielle telles que définies ci-dessus, on réalise la deuxième couche de revêtement à une épaisseur supérieure à 100μm. Pour éviter que la deuxième couche de revêtement ne soit trop poreuse, on la réalise à une épaisseur de 200μm. B 2 ° 3 5 to 15% C CooOO less than 2% sb 2 o 3 less than 2% In order to obtain good adhesion of the coating, by absorption, dissolution and surface attack as defined above, the second coating layer is produced at a thickness greater than 100 μm. To prevent the second coating layer from being too porous, it is produced at a thickness of 200 μm.
Dans le but d'assurer la fermeture du revêtement et d'obtenir une bonne régularité en épaisseur du revêtement, ce qui limite les porosités ouvertes et confère au revêtement une surface lisse, on réalise un revêtement sur la surface de la pièce de révolution par application de trois couches de matériaux minéraux, le matériau formant la troisième couche étant appliqué sous forme de poudre ou de barbotine. On réalise la troisième couche par application d'un émail ayant la composition en poids suivante :In order to ensure the closure of the coating and to obtain a good regularity in thickness of the coating, which limits the open porosities and gives the coating a smooth surface, a coating is produced on the surface of the part of revolution by application. three layers of mineral materials, the material forming the third layer being applied in the form of powder or slip. The third layer is produced by applying an enamel having the following composition by weight:
Si02 40 à 60% ;Si0 2 40 to 60%;
CaO + MgO inférieur à 5%CaO + MgO less than 5%
Li20 inférieur à 5% T TiiO02, 5 à 15%Li 2 0 less than 5% T TiiO0 2, 5 to 15%
NiO inférieur à 2%NiO less than 2%
ZnO inférieur à 2%ZnO less than 2%
A1203 inférieur à 10%A1 2 0 3 less than 10%
Na 0 + K20 15 à 20% Na 0 + K 2 0 15 to 20%
CoO inférieur à 2% sb2o3 inférieur à 2% Cette composition qui peut être la même que celle de la deuxième couche ou qui peut varier par rapport à cette dernière, permet de napper les couches précédentes en formant une pellicule couvrante.CoO less than 2% sb 2 o 3 less than 2% This composition which may be the same as that of the second layer or which may vary with respect to the latter, makes it possible to coat the previous layers by forming a covering film.
Pour assurer les fonctions de fermeture et de nappage, on réalise la troisième couche à une épaisseur supérieure à 100μm. Dans le but d'obtenir une bonne fusion au dépôt on réalise la troisième couche à une épaisseur de 200μm. La fabrication de pièces tubulaires en fonte revêtues de verre est connue (voir par exemple le document FR-2 297 817 au nom de la Demanderesse).To ensure the closing and covering functions, the third layer is produced at a thickness greater than 100 μm. In order to obtain a good fusion on deposit, the third layer is produced at a thickness of 200 μm. The manufacture of tubular cast iron parts coated with glass is known (see for example document FR-2 297 817 in the name of the Applicant).
La fabrication selon l'invention d'une pièce métallique de révolution se fait selon un procédé comprenant au moins les étapes successives suivantes :The manufacturing according to the invention of a metallic piece of revolution is done according to a process comprising at least the following successive steps:
- un traitement au magnésium,- a magnesium treatment,
- une inoculation- an inoculation
- une opération de centrifugation de ladite fonte, opération au cours de laquelle on réalise la première couche de revêtement telle que définie ci-dessus.- A centrifugation operation of said cast iron, operation during which the first coating layer as defined above is produced.
Ce procédé permet de réaliser le dépôt du revêtement au cours de la fabrication de la pièce métallique de révolution et de profiter de l'énergie thermique du métal pour réaliser la fusion de la première couche.This process makes it possible to deposit the coating during the manufacture of the metallic piece of revolution and to take advantage of the thermal energy of the metal to achieve the melting of the first layer.
L'intégration des étapes de dépôt du revêtement aux étapes de fabrication de la pièce métallique de révolution permet de réduire le nombre d'opérations de fabrication et donc de rendre le procédé de fabrication moins coûteux.The integration of the steps of depositing the coating with the steps of manufacturing the metallic piece of revolution makes it possible to reduce the number of manufacturing operations and therefore to make the manufacturing process less expensive.
L'invention a également pour objet une pièce métallique creuse de révolution, revêtue sur la partie interne de sa surface de matériaux minéraux, cette pièce étant fabriquée de manière conforme au procédé décrit ci- dessus.The subject of the invention is also a hollow metal part of revolution, coated on the internal part of its surface with mineral materials, this part being manufactured in accordance with the method described above.
Cette pièce permet de transporter des fluides agressifs sans que les caractéristiques de ces fluides soient altérées ou que la pièce creuse de révolution soit détériorée. L'invention se rapporte aussi à l'utilisation de la pièce obtenue suivant le procédé défini ci-dessus pour le transport des fluides agressifs.This part makes it possible to transport aggressive fluids without the characteristics of these fluids being altered or the hollow part of revolution being deteriorated. The invention also relates to the use of the part obtained according to the process defined above for the transport of aggressive fluids.
La présente invention est représentée par un exemple de mise en oeuvre appliqué à un élément de tuyauterie d'adduction d'eau ou d'assainissement en fonte ductile, illustré par des figures annexées, sur lesquelles : - la Fig. 1 montre en perspective un élément de tuyauterie obtenu -i selon le procédé de 1' invention ;The present invention is represented by an exemplary implementation applied to an element of water supply or sanitation piping in ductile iron, illustrated by appended figures, in which: - Fig. 1 shows in perspective a pipe element obtained -i according to the method of one invention;
- la Fig. 2 est une micrographie au grossissement 100 du revêtement d'émail avec la zone mitoyenne du substrat de fonte de l'élément de tuyauterie représenté à la Fig. 1.- Fig. 2 is a micrograph at 100 magnification of the enamel coating with the joint area of the cast iron substrate of the piping element shown in FIG. 1.
Dans cet exemple de fabrication d'un élément de tuyauterie 1 présentant un revêtement intérieur 2, la fonte liquide subit un traitement au magnésium puis une inoculation. L'inoculation de la fonte est réalisée à l'aide d'un inoculant tel que le ferro-silicium introduit dans la fonte liquide sous forme de poudre ou de fil, de manière connue, par exemple le document FR-A-2 546 783 au nom de la Demanderesse.In this example of manufacturing a piping element 1 having an internal coating 2, the liquid iron undergoes a magnesium treatment then an inoculation. The inoculation of the cast iron is carried out using an inoculant such as ferro-silicon introduced into the liquid cast iron in the form of powder or wire, in known manner, for example the document FR-A-2 546 783 in the name of the Applicant.
Le procédé comprend une opération de centrifugation de la fonte. Au cours de l'opération de centrifugation, on réalise la première couche 4 de revêtement 2 à une épaisseur de 100μm, par application d'un émail réduit de la composition suivante :The method includes an operation of centrifuging the cast iron. During the centrifugation operation, the first layer 4 of coating 2 is produced at a thickness of 100 μm, by application of a reduced enamel of the following composition:
Si02 balance CaO + MgO 10 % B203 5 %Si0 2 CaO + MgO balance 10% B 2 0 3 5%
CoO 1 % Fe2°3 2 % CoO 1% Fe 2 ° 3 2%
A1203 5 %A1 2 0 3 5%
Na20 + K20 22 % F2 1 %Na 2 0 + K 2 0 22% F 2 1%
NiO 1 % Cet émail est appliqué sous forme de poudre sèche.NiO 1% This enamel is applied as a dry powder.
Après l'opération de centrifugation, l'élément de tuyauterie 1 est graphitisé. Ensuite, on réalise la deuxième couche 5 de revêtement 2 à une épaisseur de 200μm, par application d'un émail sous forme de poudre, ledit émail étant de la composition suivante en poids : Si02 balance CaO + MgO 0.5% Li20 4%After the centrifugation operation, the pipe element 1 is graphitized. Then, the second coating layer 5 2 is produced at a thickness of 200 μm, by applying an enamel in powder form, said enamel being of the following composition by weight: Si0 2 balance CaO + MgO 0.5% Li 2 0 4%
Ti02 6.5%Ti0 2 6.5%
NiO 0.5%NiO 0.5%
ZnO 0.5%ZnO 0.5%
A1203 6%A1 2 0 3 6%
Na20 + κ2o 19%Na 2 0 + κ 2 o 19%
B2°3 11% B 2 ° 3 11%
CoO 1.5%CoO 1.5%
Sb 03 1% La deuxième couche 5 de revêtement 2 est appliquée sur 1'élément de tuyauterie 1 à une température comprise entre 800° et 700°C. Ensuite on effectue une ferritisation de 1'élément de tuyauterie 1 dans une plage de températures inférieures à 800°C, ce qui assure une cuisson de la deuxième couche 5 de revêtement 2. Puis on réalise la troisième couche 6 de revêtement 2 d'une épaisseur de 200μm par application d'émail sous forme de poudre de composition identique à la composition de l'émail de la deuxième couche 5 de revêtement 2 présenté ci-dessus. Cette poudre est déposée sur l'élément de tuyauterie 1 à une température inférieure à 800°C.Sb 0 3 1% The second coating layer 5 is applied to the piping element 1 at a temperature between 800 ° and 700 ° C. Next, the piping element 1 is ferritized in a temperature range of less than 800 ° C., which ensures the baking of the second coating layer 2. Then the third coating layer 6 is produced with a thickness of 200 μm by application of enamel in the form of powder of composition identical to the composition of the enamel of the second layer 5 of coating 2 presented above. This powder is deposited on the pipe element 1 at a temperature below 800 ° C.
Après le dépôt de la troisième couche 6, on effectue un glaçage de la troisième couche, c'est-à-dire une cuisson d'une durée inférieure à cinq minutes à une température comprise entre 750°C et 700°C.After the deposition of the third layer 6, the third layer is glazed, that is to say a firing of a duration of less than five minutes at a temperature between 750 ° C and 700 ° C.
Dans une première variante, la fonte obtenue après la centrifugation est une fonte grise perlitique à graphite sphéroïdal. Le procédé diffère alors de celui décrit précédemment en ce que l'on n'opère pas de graphitisation de l'élément de tuyauterie 1.In a first variant, the cast iron obtained after centrifugation is a gray perlitic cast iron with spheroidal graphite. The process then differs from that described above in that there is no graphitization of the piping element 1.
Dans ces conditions, il est possible de réaliser la deuxième couche 5 de revêtement 2 pendant ou après l'opération de centrifugation, par le dépôt de l'émail sous forme d'une poudre sèche. L'élément de tuyauterie subit par la suite un traitement de ferritisation dans une plage de températures inférieures à 800°C, et la cuisson de la deuxième couche 5 de revêtement 2 a lieu simultanément à la ferritisation de 1'élément de tuyauterie 1.Under these conditions, it is possible to produce the second coating layer 5 during or after the centrifugation operation, by depositing the enamel in the form of a dry powder. The pipe element is subsequently subjected to a ferritization treatment in a temperature range of less than 800 ° C., and the baking of the second layer 5 coating 2 takes place simultaneously with the ferritization of the piping element 1.
Dans une deuxième variante, la fonte obtenue après la centrifugation est une fonte grise ferritique à graphite sphéroïdal. Le procédé diffère alors du procédé de la première variante en ce que l'on n'opère pas de ferritisation de l'élément de tuyauterie 1 et en ce que l'on effectue une cuisson de la deuxième couche 5 de revêtement 2 à température comprise entre 800° et 700°C dudit élément 1 après la pose de la deuxième couche 5 de revêtement 2.In a second variant, the cast iron obtained after centrifugation is a gray ferritic cast iron with spheroidal graphite. The method then differs from the method of the first variant in that there is no ferritization of the piping element 1 and that the second coating layer 5 of coating 2 is baked at a temperature included between 800 ° and 700 ° C of said element 1 after the application of the second coating layer 5 2.
Dans une troisième variante, le procédé diffère de celui décrit initialement en ce que l'émail est déposé sous la forme d'une barbotine pour réaliser la deuxième couche 5 de revêtement 2, après la graphitisation et alors que l'élément de tuyauterie 1 est à température ambiante.In a third variant, the method differs from that initially described in that the enamel is deposited in the form of a slip to produce the second layer 5 of coating 2, after graphitization and while the pipe element 1 is at room temperature.
Dans une quatrième variante, le procédé diffère de la première variante en ce que 1'émail est déposé sous la forme d'une barbotine après la centrifugation et alors que l'élément de tuyauterie est à la température ambiante.In a fourth variant, the method differs from the first variant in that the enamel is deposited in the form of a slip after centrifugation and while the piping element is at ambient temperature.
Dans une cinquième variante, la troisième couche d'émail est déposée sous forme de barbotine alors que l'élément de tuyauterie 1 est à température ambiante.In a fifth variant, the third enamel layer is deposited in the form of a slip while the pipe element 1 is at ambient temperature.
L'élément de tuyauterie 1 pouvant être obtenu par le procédé suivant l'invention, y compris les cinq variantes décrites ci-dessus, est un tuyau en fonte ductile 3 présentant sur la partie interne de sa surface un revêtement 2 d'émail constitué de trois couches 4, 5, 6. Ce tuyau présente à une extrémité un bout uni 8 et à son autre extrémité un emboîtement 7 apte à recevoir le bout uni d'un autre tuyau identique.The pipe element 1 obtainable by the process according to the invention, including the five variants described above, is a ductile iron pipe 3 having on the internal part of its surface a coating 2 of enamel consisting of three layers 4, 5, 6. This pipe has at one end a plain end 8 and at its other end a socket 7 adapted to receive the plain end of another identical pipe.
La micrographie du revêtement d'émail 2 sur une zone mitoyenne du substrat de fonte (Fig. 2), représente le substrat, l'interface entre le substrat 3 et le revêtement 2, la deuxième couche 5 de revêtement 2 et la troisième couche 6 de revêtement 2. Le substrat 3 est une fonte ferritique à graphite sphéroïdal. Au niveau de l'interface entre le substrat et le revêtement, la peau d'oxydes a été dissoute. La première couche 4 de revêtement 2 a été absorbée par la deuxième couche 5 de revêtement 2. L'interface entre le revêtement et le substrat de fonte 3 est cohérente, et présente peu de porosités. L'attaque superficielle localisée du substrat conduit à la formation de sites d'ancrage pour le revêtement 2.The micrograph of the enamel coating 2 on a joint area of the cast iron substrate (Fig. 2), represents the substrate, the interface between the substrate 3 and the coating 2, the second layer 5 of coating 2 and the third layer 6 coating 2. The substrate 3 is a ferritic cast iron with spheroidal graphite. At the level of the interface between the substrate and the coating, the oxide skin was dissolved. The first coating layer 4 2 has been absorbed by the second coating layer 5 2. The interface between the coating and the cast iron substrate 3 is consistent, and has few porosities. The localized surface attack of the substrate leads to the formation of anchoring sites for the coating 2.
La deuxième couche 5 présente une porosité limitée. La troisième couche 6 de revêtement 2 ne présente pas de décohésion avec la deuxième couche 5 de revêtement 2. Elle présente une très faible porosité, forme une surface lisse et réalise une très bonne fermeture du revêtement. Le procédé selon 1'invention permet de revêtir des pièces métalliques même oxydées qui présentent une peau d'oxydes adhérente d'épaisseur inférieure à 20μm.The second layer 5 has a limited porosity. The third coating layer 6 2 does not show any decohesion with the second coating layer 5 2. It has a very low porosity, forms a smooth surface and achieves very good closure of the coating. The method according to the invention makes it possible to coat even oxidized metal parts which have an adherent oxide skin with a thickness of less than 20 μm.
Grâce à 1'intégration des étapes de fabrication du revêtement d'émail 2 aux opérations de fabrication du tuyau 1, l'invention permet un gain en productivité et en énergie thermique. L'invention permet de supprimer une ou plusieurs étapes spécifiques de cuisson de l'émail.Thanks to the integration of the steps for manufacturing the enamel coating 2 with the operations for manufacturing the pipe 1, the invention allows a gain in productivity and in thermal energy. The invention makes it possible to eliminate one or more specific stages of firing the enamel.
Les variantes du procédé dans lesquelles l'application de l'émail se fait sous forme de barbotine permettent d'obtenir une grande souplesse de production.Variants of the process in which the application of the enamel is in the form of a slip make it possible to obtain great flexibility in production.
Les tuyaux obtenus permettent de réaliser des canalisations de transport de fluides agressifs, tels que solutions acides, solutions à forte teneur en C02 dissous, fluides abrasifs, rejets industriels, eaux usées ou boues d'épuration. The pipes obtained make it possible to carry out transport lines for aggressive fluids, such as acid solutions, solutions with a high content of dissolved C0 2 , abrasive fluids, industrial discharges, waste water or sewage sludge.

Claims

REVENDICATIONS
1.- Procédé de fabrication d'une pièce métallique revêtue de matériaux minéraux à base de silice et d'oxyde de sodium, caractérisé en ce que l'on applique successivement plusieurs couches (4, 5, 6) de revêtement minéral (2) sur au moins une partie de la surface de ladite pièce, les éléments de matériau minéral étant présents dans des variations de proportion différentes suivant les couches, la première couche (4) de revêtement (2) étant réalisée à une épaisseur inférieure à 200μm et l'on réalise la deuxième couche (5) de revêtement (2) d'une épaisseur supérieure à 100μm.1.- Method of manufacturing a metal part coated with mineral materials based on silica and sodium oxide, characterized in that several layers (4, 5, 6) of mineral coating (2) are applied successively on at least part of the surface of said part, the elements of mineral material being present in variations of different proportion depending on the layers, the first layer (4) of coating (2) being produced at a thickness of less than 200 μm and l 'the second layer (5) of coating (2) with a thickness greater than 100 μm is produced.
2 . - Procédé selon la revendication 1, caractérisé en ce que la réalisation de la première couche (4) de revêtement (2) s'effectue par application du matériau minéral sous forme de poudre, en particulier une poudre sèche.2. - Method according to claim 1, characterized in that the production of the first layer (4) of coating (2) is carried out by application of the mineral material in powder form, in particular a dry powder.
3.- Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que le matériau minéral appliqué pour former la première couche (4) de revêtement (2) est un émail ayant la composition suivante en poids : Si02 50 à 70 %3.- Method according to one of claims 1 or 2, characterized in that the mineral material applied to form the first layer (4) of coating (2) is an enamel having the following composition by weight: Si0 2 50 to 70 %
CaO + MgO 5 à 20 % B203 moins de 10 %CaO + MgO 5 to 20% B 2 0 3 less than 10%
CoO moins de 2 % Fe2°3 moins de 5 %CoO less than 2% Fe 2 ° 3 less than 5%
Al203 moins de 10 % Na20 + K20 15 à 25 % F2 moins de 2 %Al 2 0 3 less than 10% Na 2 0 + K 2 0 15 to 25% F 2 less than 2%
NiO moins de 2 %NiO less than 2%
4.- Procédé selon la revendication 2 ou 3, caractérisé en ce que le matériau minéral est réduit lors de son élaboration.4.- Method according to claim 2 or 3, characterized in that the mineral material is reduced during its preparation.
5.- Procédé selon la revendication 4, caractérisé en ce qu'on réalise la première couche (4) de revêtement (2) à une épaisseur de 100μm. 5.- Method according to claim 4, characterized in that the first layer (4) of coating (2) is produced at a thickness of 100 μm.
6.- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la réalisation de la deuxième couche (5) de revêtement (2) s'effectue par l'application du matériau minéral sous forme de poudre, en particulier de poudre sèche.6.- Method according to one of claims 1 to 5, characterized in that the production of the second layer (5) of coating (2) is carried out by the application of the mineral material in powder form, in particular of dry powder.
7.- Procédé selon l'une des revendications 1 à 5, caractérisé en ce que la réalisation de la deuxième couche (5) de revêtement (2) s'effectue par application sous la forme d'une barbotine du matériau minéral. 7.- Method according to one of claims 1 to 5, characterized in that the production of the second layer (5) of coating (2) is carried out by application in the form of a slip of the mineral material.
8.- Procédé selon 1'une quelconque des revendications 1 à 7, caractérisé en ce que le matériau minéral appliqué pour former la deuxième couche (5) de revêtement (2) est un émail de la composition suivante en poids : S SiiO02, 40 à 60% ;8.- Method according to any one of claims 1 to 7, characterized in that the mineral material applied to form the second layer (5) of coating (2) is an enamel of the following composition by weight: S SiiO0 2 , 40 to 60%;
CaO + MgO inférieur à 5%CaO + MgO less than 5%
Li20 inférieur à 5%Li 2 0 less than 5%
Ti02 5 à 15%Ti0 2 5 to 15%
NiO inférieur à 2% Z ZnnOO inférieur à 2%NiO less than 2% Z ZnnOO less than 2%
A1203 inférieur à 10%A1 2 0 3 less than 10%
Na20 + K20 15 à 20%Na 2 0 + K 2 0 15 to 20%
B2°3 5 à 15% B 2 ° 3 5 to 15%
CoO inférieur à 2% ssbb22°o33 inférieur à 2%CoO less than 2% s s b b2 2 ° o3 3 less than 2%
9.- Procédé selon 1'une des revendications précédentes, caractérisé en ce qu'on réalise la deuxième couche (5) de revêtement (2) à une épaisseur de 200μm.9.- Method according to one of the preceding claims, characterized in that the second layer (5) of coating (2) is produced at a thickness of 200 μm.
10.- Procédé selon 1'une quelconque des revendications précédentes, caractérisé en ce que l'on réalise un revêtement (2) sur la surface de la pièce par application de trois couches (4, 5, 6) de matériaux minéraux, le matériau formant la troisième couche étant appliqué sous forme de poudre ou de barbotine. 10.- Method according to any one of the preceding claims, characterized in that a coating (2) is produced on the surface of the part by application of three layers (4, 5, 6) of mineral materials, the material forming the third layer being applied in the form of powder or slip.
11.- Procédé selon la revendication 10, caractérisé en ce que l'on réalise la troisième couche (6) de revêtement (2) par application d'un émail ayant la composition en poids suivante : SiO-> 40 a 60% ;11.- Method according to claim 10, characterized in that one realizes the third layer (6) of coating (2) by applying an enamel having the following composition by weight: SiO- > 40 to 60%;
CaO + MgO inférieur à 5%CaO + MgO less than 5%
Li20 inférieur à 5%Li 2 0 less than 5%
Ti02 5 à 15%Ti0 2 5 to 15%
NiO inférieur à 2%NiO less than 2%
ZnO inférieur à 2%ZnO less than 2%
A1203 inférieur à 10%A1 2 0 3 less than 10%
NNaa2-,00 ++ κK200 15 à 20%NNaa 2 -, 00 ++ κK 2 00 15 to 20%
B2°3 5 à 15% CoO inférieur à 2% B 2 ° 3 5 to 15% CoO less than 2%
Sb203 inférieur à 2%Sb 2 0 3 less than 2%
12.- Procédé selon l'une des revendications 10 ou 11 , caractérisé en ce que l'on réalise la troisième couche (6) de revêtement (2) à une épaisseur supérieure à 100μm.12.- Method according to one of claims 10 or 11, characterized in that the third layer (6) of coating (2) is produced at a thickness greater than 100 μm.
13.- Procédé selon la revendication précédente, caractérisé en ce que l'on élabore la troisième couche (6) de revêtement (2) à une épaisseur de 200μm.13.- Method according to the preceding claim, characterized in that the third layer (6) of coating (2) is produced at a thickness of 200 μm.
14.- Procédé selon la revendication 1, caractérisé en ce que la fabrication de la pièce métallique à partir d'une fonte liquide comprend au moins les étapes successives suivantes : - un traitement au magnésium,14.- Method according to claim 1, characterized in that the manufacture of the metal part from a liquid iron comprises at least the following successive steps: - a magnesium treatment,
- une inoculation,- an inoculation,
- une opération de centrifugation de ladite fonte, opération au cours de laquelle on réalise la première couche (4) de revêtement (2) de manière conforme à l'une des revendications 1 à 5.- a centrifugation operation of said cast iron, operation during which the first layer (4) of coating (2) is produced in accordance with one of claims 1 to 5.
15.- Procédé selon la revendication 14, caractérisé en ce que la pièce en fonte est à une température comprise entre 950°C et 700°C lorsque l'on applique la deuxième couche (5) de revêtement (2) de manière conforme à 1'une des revendications 6, 8, 9, ou 10. 15.- Method according to claim 14, characterized in that the cast iron part is at a temperature between 950 ° C and 700 ° C when the second layer (5) of coating (2) is applied in accordance with One of claims 6, 8, 9, or 10.
16.- Procédé selon la revendication 14, caractérisé en ce que la pièce en fonte est à la température ambiante lorsque l'on applique la deuxième couche (5) de revêtement (2) de manière conforme à la revendication 7. 16.- Method according to claim 14, characterized in that the cast iron part is at room temperature when the second layer (5) of coating (2) is applied in accordance with claim 7.
17.- Procédé selon l'une des revendications 15 ou 16, caractérisé en ce qu'après avoir réalisé la première couche (4) de revêtement (2), on applique sur la pièce la deuxième couche (5) de revêtement (2) après 1'opération de centrifugation. 17.- Method according to one of claims 15 or 16, characterized in that after having produced the first layer (4) of coating (2), the second layer (5) of coating (2) is applied to the part after the centrifugation operation.
18.- Procédé selon la revendication 15, caractérisé en ce que après avoir réalisé la première couche (4) de revêtement (2) , on réalise la deuxième couche (5) de revêtement (2) au cours de l'opération de centrifugation.18.- Method according to claim 15, characterized in that after having produced the first layer (4) of coating (2), the second layer (5) of coating (2) is produced during the centrifugation operation.
19.- Procédé selon l'une des revendications 15 à 18, caractérisé en ce qu'après la réalisation de la deuxième couche (5) de révêtement (2), on effectue un traitement thermique de ferritisation de la pièce dans une plage de températures inférieures à 800°C, ledit traitement thermique de ferritisation étant suivi par la réalisation de la troisième couche (6) de revêtement (2) de manière conforme à 1'une des revendications 10 à 13.19.- Method according to one of claims 15 to 18, characterized in that after the production of the second layer (5) of coating (2), a ferritization heat treatment of the part is carried out in a temperature range below 800 ° C, said ferritization heat treatment being followed by the production of the third coating layer (6) (2) in accordance with one of claims 10 to 13.
20.- Procédé selon l'une des revendications 15 à 17, caractérisé en ce qu'après l'opération de centrifugation de la pièce et avant 1'élaboration de la deuxième couche (5) de revêtement (2), on effectue un traitement thermique de graphitisation de la fonte.20.- Method according to one of claims 15 to 17, characterized in that after the centrifugation operation of the part and before the preparation of the second layer (5) of coating (2), a treatment is carried out thermal graphitization of cast iron.
21.- Procédé selon l'une des revendications 15 à 18, caractérisé en ce qu'après avoir réalisé la deuxième couche (5) de revêtement (2) on effectue une opération de cuisson de la pièce à température comprise entre 800° et 700°C.21.- Method according to one of claims 15 to 18, characterized in that after having produced the second layer (5) of coating (2) a cooking operation of the part is carried out at a temperature between 800 ° and 700 ° C.
22.- Procédé selon la revendication précédente, caractérisé en ce qu'après la cuisson on applique une troisième couche (6) de revêtement (2) de manière conforme à l'une des revendications 10 à 13. 22.- Method according to the preceding claim, characterized in that after cooking a third layer (6) of coating (2) is applied in accordance with one of claims 10 to 13.
23.- Procédé selon la revendication 19 ou 22, caractérisé en ce qu'après le dépôt de la troisième couche (6) de revêtement (2) sous forme de barbotine, on effectue une cuisson du revêtement à température comprise entre 750° et 700°C.23.- Method according to claim 19 or 22, characterized in that after the deposition of the third layer (6) of coating (2) in the form of slip, the coating is baked at a temperature between 750 ° and 700 ° C.
24.- Pièce métallique creuse de révolution (1), revêtue sur la partie interne de sa surface d'au moins un matériau minéral, caractérisée en ce qu'elle est fabriquée de manière conforme à l'une quelconque des revendications 1 à 23.24. Hollow metallic piece of revolution (1), coated on the internal part of its surface with at least one mineral material, characterized in that it is manufactured in accordance with any one of claims 1 to 23.
25.- Utilisation de la pièce métallique creuse de révolution (1) selon la revendication 24 pour le transport de fluides agressifs, en particulier des solutions acides, solutions à forte teneur en C02 dissous, fluides abrasifs, rejets industriels, eaux usées ou boues d'épuration. 25.- Use of the hollow metallic part of revolution (1) according to claim 24 for the transport of aggressive fluids, in particular acid solutions, solutions with a high content of dissolved C0 2 , abrasive fluids, industrial waste, waste water or sludge of purification.
EP94907607A 1993-02-26 1994-02-23 Method of manufacture of a metal part coated with mineral materials, part obtained and use thereof Expired - Lifetime EP0686212B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9302419A FR2701963B1 (en) 1993-02-26 1993-02-26 Method of manufacturing a metal part coated with mineral materials, part obtained and its use.
FR9302419 1993-02-26
PCT/FR1994/000197 WO1994019511A1 (en) 1993-02-26 1994-02-23 Method of manufacture of a metal part coated with mineral materials, part obtained and use thereof

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EP0686212A1 true EP0686212A1 (en) 1995-12-13
EP0686212B1 EP0686212B1 (en) 2000-06-14

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WO (1) WO1994019511A1 (en)
ZA (1) ZA941307B (en)

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US3484266A (en) * 1966-07-05 1969-12-16 Smith Corp A O Method of internally coating tubular members with glass
FR2297817A1 (en) * 1975-01-16 1976-08-13 Pont A Mousson Cast metal tube with glass liner mfr. - by injecting glass powder into the hot freshly cast metal surface
CA1075270A (en) * 1976-03-26 1980-04-08 Eagle-Picher Industries Method and composition for preparing a ferrous surface for porcelain enameling
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Also Published As

Publication number Publication date
DE69424933T2 (en) 2000-10-19
FR2701963A1 (en) 1994-09-02
ATE193906T1 (en) 2000-06-15
HU9502510D0 (en) 1995-10-30
HUT72451A (en) 1996-04-29
EG20502A (en) 1999-06-30
SI9400090A (en) 1994-12-31
RU2131483C1 (en) 1999-06-10
ZA941307B (en) 1994-09-30
NO953355L (en) 1995-08-25
PL310406A1 (en) 1995-12-11
SK104295A3 (en) 1996-03-06
TNSN94019A1 (en) 1995-04-25
EP0686212B1 (en) 2000-06-14
HRP940138A2 (en) 1996-08-31
CZ213495A3 (en) 1997-04-16
ES2147572T3 (en) 2000-09-16
CA2157008A1 (en) 1994-09-01
CZ284752B6 (en) 1999-02-17
BG99883A (en) 1996-02-29
WO1994019511A1 (en) 1994-09-01
AU678818B2 (en) 1997-06-12
FR2701963B1 (en) 1995-04-21
AU6111394A (en) 1994-09-14
BR9406163A (en) 1996-01-09
NO953355D0 (en) 1995-08-25
TR28278A (en) 1996-04-05
DE69424933D1 (en) 2000-07-20

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