EP0037033A1 - Method and apparatus for metal plating of cylindric bores with large diameter extending across the central part of a work piece having large dimensions - Google Patents

Method and apparatus for metal plating of cylindric bores with large diameter extending across the central part of a work piece having large dimensions Download PDF

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Publication number
EP0037033A1
EP0037033A1 EP81102095A EP81102095A EP0037033A1 EP 0037033 A1 EP0037033 A1 EP 0037033A1 EP 81102095 A EP81102095 A EP 81102095A EP 81102095 A EP81102095 A EP 81102095A EP 0037033 A1 EP0037033 A1 EP 0037033A1
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EP
European Patent Office
Prior art keywords
bore
electrolyte
axis
enclosure
tanks
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
EP81102095A
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German (de)
French (fr)
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EP0037033B1 (en
Inventor
André Coulon
Jacques Blanc
Gilbert Pellus
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.)
Tsm Traitements De Surface Et Mecanique SA
Alsthom Atlantique SA
Original Assignee
Tsm Traitements De Surface Et Mecanique SA
Alsthom Atlantique SA
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Priority to AT81102095T priority Critical patent/ATE5267T1/en
Publication of EP0037033A1 publication Critical patent/EP0037033A1/en
Application granted granted Critical
Publication of EP0037033B1 publication Critical patent/EP0037033B1/en
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/02—Tanks; Installations therefor
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D17/00—Constructional parts, or assemblies thereof, of cells for electrolytic coating
    • C25D17/10—Electrodes, e.g. composition, counter electrode
    • C25D17/12—Shape or form
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/02—Heating or cooling
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D21/00—Processes for servicing or operating cells for electrolytic coating
    • C25D21/16—Regeneration of process solutions
    • C25D21/18—Regeneration of process solutions of electrolytes
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/08—Electroplating with moving electrolyte e.g. jet electroplating
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • C25D7/04—Tubes; Rings; Hollow bodies

Definitions

  • the present invention relates first of all to a method of metallic deposition on a revolution bore passing right through the central part of a large part.
  • These large parts are for example turbine rotor discs which are fixed to a shaft by shrinking with or without additional keying.
  • the bore of a disc can also be coated with nickel to avoid stress corrosion (in English: fretting corrosion or stress corrosion cracking) which can arise between two hooped parts.
  • the nickel deposit which must have a medium or thick thickness (between 0.1 and several millimeters) is carried out mechanically (foil, socket, etc.).
  • the method according to the invention is characterized in that the large part is arranged and centered between an upper tank and a lower tank having a common vertical axis of symmetry so that the bore has its axis of symmetry coincides with the axis of the tanks and that the two tanks and the part define an enclosure inside which the bore is arranged and - outside which protrudes the peripheral part of the part, which said enclosure is filled with electrolyte and the electrolyte is rapidly circulated between a supply tube opening into said enclosure and an evacuation tube located at the bottom of the lower tank, the electrolyte being regenerated outside the enclosure after its evacuation and before being reinjected by the supply tube, the electrolyte inside the enclosure being driven in a helical movement descending at the level of the bore of the part, and that a direct current is circulated simultaneously between on the one hand a curtain of anodes arranged opposite the bore symmetrically around the axis of the tanks and on the other hand the large part serving as a cathode.
  • the device according to the invention only the central part of the part is immersed in the electrolyte bath.
  • the peripheral parts of the part which can be delicate in the electrolyte, have not been immersed and, moreover, without special precautions, the deposition of the metal on this peripheral part has been prevented.
  • the device according to the invention consists of tanks of reduced dimensions which must not contain the whole of the large part.
  • a device and method for depositing a layer of metal inside the bore of a piece of metal, for example from document US-A 4,111,761.
  • the part is surrounded by a larger diameter enclosure which is clamped between a lower cover and an upper cover.
  • the circulation of the electrolyte is done by injection sometimes in the upper cover sometimes in the lower cover so that there occurs along the bore of small dimensions a circulation of the electrolyte alternately in the downward direction and in the upward direction.
  • the means serving to drive the electrolyte in a helical movement in the vicinity of the bore comprise a ring of vertical axis coinciding with the axis of the cubes and situated slightly above the bore, the diameter of the ring being lower than that of the bore, said ring being pierced with small orifices arranged on a circle and projecting compressed air towards the inside of the bore in directions D deducing from one of the other by a rotation around the vertical axis, each making an angle b with a vertical plane passing through the orifice considered, the blown air being evacuated by communication with the outside located at the upper part of the enclosure.
  • a lower ring symmetrical with respect to the center of the bore is added to the upper ring.
  • means are used located in the lower tank in the axis of the tanks to imprint the electrolyte, in the vicinity of the axis and which would tend to remain stagnant, an upward movement.
  • the device preferably comprises means making it possible to maintain the temperature of the electrolyte inside the enclosure at a constant level.
  • These means comprise for example a probe making it possible to detect the temperature and an electrical resistance, the starting of which is carried out each time the temperature detected by the probe falls below a determined level.
  • the metal to be deposited will generally be pure nickel having a percentage of sulfur of less than 0.01%.
  • FIG. 1 there is shown a turbine rotor disc 1 comprising in its central region a bore or female part 2 of revolution intended to be hooped on a shaft.
  • the surface of bore 2 has been prepared beforehand, for example by shot blasting.
  • the disc 1 is centered between a lower tank 3 and an upper tank 4 facing each other and admitting the same vertical axis of symmetry.
  • the axis of the bore 2 is then merged with the axis of the tanks 3 and 4.
  • the lower tank 3 has a cylindrical part placed above a conical part 6, the point of which is directed downwards.
  • the cylindrical part of the tank 3 and the conical part 6 are connected to a base 7.
  • the tanks 3 and 4 define, with the part 1, an enclosure 8 inside of which is the bore 2 and outside of which protrudes the peripheral part 9 of the part 1.
  • Sealing means consisting of a flat O-ring 10 resistant to the electrolyte above and below which two hollow O-rings of circular section 11 are placed are placed between the piece 1 and the upper tank 4.
  • sealing means consisting of a flat O-ring 12 resistant to the electrolyte have been placed above and below which two hollow O-rings of circular section 13 are arranged.
  • a curtain of nickel anodes 14 is arranged along the generatrices of a cylinder whose axis coincides with the axis of the tanks. These anodes 14 are fixed to the cover 5 of the upper tank 4 and descend to the bottom of the cylindrical part of the lower tank 3 so that the bore 2 is traversed right through by these anodes 14.
  • a vertical tube 15 is disposed on the axis of the tanks and fixed to the cover 5 of the upper tank 4. This tube serving for the supply of electrolyte opens out in the middle of the bore 2 by an apple 15 'sending the electrolyte to the top.
  • the lower tank 3 is provided in its lower part with an evacuation orifice 16 of the electrolyte.
  • tubular rings 17, 17 'of vertical axis merged with the axis of the tanks.
  • the rings are arranged symmetrically with respect to the horizontal plane passing through the center of the bore; they have a diameter less than the smallest bore diameter that can be treated with the device.
  • These hollow rings 17, 17 ′ serve to supply pressurized air, and are supplied by pressurized gas inlets 19.
  • the upper ring 17 has multiple orifices 18 situated on a circle with a vertical axis and sending compressed air towards the interior of the bore.
  • the direction D in which the air is ejected by a particular orifice M makes an angle b with the vertical plane V passing through the axis of the tanks and the point M and is located in a plane making an angle a with the horizontal plane and 90 ° with the vertical plane V (see Figure 2).
  • the angles a and b can for example be taken close to 45 °.
  • the directions D of the different orifices are deduced from each other by rotation about the axis of the tanks.
  • the electrolyte ejected by the apple 15 ' is driven in a downward helical movement, when the speed is established.
  • the orifices 18 are drilled axially in a direction making an angle a with the horizontal plane, then the spoons 28 are welded in the vicinity of each orifice M imposing a deflection angle b in a plane perpendicular to the axial plane passing through point M (see FIG. 3 which represents a longitudinal section of the ring at the point M and FIG. 4 a top view).
  • a compressed air inlet tube 20 connected to a nozzle 21 opening into the lower tank on the axis and pierced with multiple holes blowing the air from bottom to top.
  • a plug 22 allowing the gases to escape.
  • thermometric probe 23 is disposed inside the enclosure 8 and is connected to a generator 24 which sends a current to an electric heating resistor 25 located in the lower tank when the temperature of the electrolyte deviates by 1 ° C relative to the set temperature.
  • the enclosure 8 is filled with electrolyte up to the top of the upper ring 17.
  • the electrolyte must not reach the plug 22.
  • a circuit for regenerating the electrolyte bath 26 and a pump and valve system 27 for continuously injecting regenerated electrolyte are disposed between the discharge port 16 of the electrolyte and the supply tube 15 .
  • the electrolyte regeneration and circulation circuits being conventional will not be described.
  • This latter bath has higher deposition rates.
  • a direct current is circulated between the anodes 14 and part 1 serving as a cathode.
  • the nickel from the anodes is deposited on the part of the part located inside the enclosure.
  • the cathode film becomes depleted as the nickel is deposited, it is therefore necessary to make a high electrolyte circulation all the more since the interior volume of the enclosure which contains the electrolyte is low. -tenuous. of the surface to be coated and above all of the large thickness which it is desired to deposit. So that the nickel deposition is regular, the electrolyte is injected symmetrically into the bore and the bath is driven in the vicinity of the bore helically by the jets of compressed air coming from the rings 17, 17 '.

Abstract

A method and apparatus for depositing a metal on a large-diameter cylindrical bore which passes right through the central portion of a large part. The invention consists in placing and centering the large part (1) between an upper tank (4) and a lower tank (3), so as to define a chamber (8) inside which the bore (2) is disposed and outside which the peripheral portions (9) of the part (1) extend, said chamber being filled with electrolyte. The electrolyte is homogenized and regenerated continuously outside the chamber (8) before being injected in the chamber (8) and before being entrained in a spirally descending motion to the level of the bore (2). The metal deposit takes place under the effect of a direct current which circulates between metal anodes (14) disposed in the bore (2) and the part (1) which serves as a cathode. The invention is used for depositing nickel on the bores of turbine rotor wheels so as to adjust dimensions or prevent fretting corrosion.

Description

La présente invention a trait tout d'abord à un procédé de dépôt métallique sur un alésage de révolution traversant de part en part la partie centrale d'une pièce de grandes dimensions. Ces pièces de grandes dimensions sont par exemple des disques de rotor de turbine qui sont fixés sur un arbre par frettage avec ou sans clavetage supplémentaire.The present invention relates first of all to a method of metallic deposition on a revolution bore passing right through the central part of a large part. These large parts are for example turbine rotor discs which are fixed to a shaft by shrinking with or without additional keying.

On sait que lorsque les disques sont défrettés pour être vérifiés, il est nécessaire de rattraper la cote de leur alésage avant de les fretter de nouveau. Pour rattraper cette cote sans affecter les caractéristiques du métal de base on dépose sur cet alésage une feuille de nickel.We know that when the discs are crimped to be checked, it is necessary to catch the dimension of their bore before fretting them again. To recover this dimension without affecting the characteristics of the base metal, a nickel sheet is deposited on this bore.

On peut également revêtir de nickel l'alésage d'un disque pour éviter la corrosion sous tension (en anglais : fretting corrosion ou stress corrosion cracking) qui peut prendre naissance entre deux pièces frettées .The bore of a disc can also be coated with nickel to avoid stress corrosion (in English: fretting corrosion or stress corrosion cracking) which can arise between two hooped parts.

On sait en effet, par exemple, que les rotors de turbines constitués de disques frettés sur un arbre subissent, à chaque mise en route, une répartition de contraintes telle, que de petits déplacements différentiels entre les pièces frettées entraînent à leur liaison une usure telle qu'un grippage ou un frottement conduisant à une corrosion particulièrement active si le milieu ambiant est aqueux.It is known, for example, that the turbine rotors made up of hooped discs on a shaft undergo, on each start-up, a distribution of stresses such that small differential displacements between the hooped parts cause such a bond to their bond seizure or friction leading to particularly active corrosion if the ambient environment is aqueous.

Le dépôt de nickel qui doit avoir une moyenne ou forte épaisseur (entre 0,1 et plusieurs millimètres) est réalisé par voie mécanique (clinquant, douille, etc..).The nickel deposit which must have a medium or thick thickness (between 0.1 and several millimeters) is carried out mechanically (foil, socket, etc.).

Pour améliorer la qualité du dépôt, celui-ci est réalisé selon l'invention par voie électrolytique.To improve the quality of the deposit, it is produced according to the invention by electrolytic means.

Le procédé selon l'invention est caractérisé en ce qu'on dispose et centre la pièce de grandes dimensions entre une cuve supérieure et une cuve inférieure ayant un axe de symétrie vertical commun de façon que l'alésage ait son axe de symétrie confondu avec l'axe des cuves et que les deux cuves et la piècedéfinissent une enceinte à l'intérieur de laquelle est disposé l'alésage et à - l'extérieur de laquelle dépasse la partie périphérique de la pièce, qu'on remplit ladite enceinte d'électrolyte et on fait circuler rapidement l'électrolyte entre un tube d'alimentation débouchant dans ladite enceinte et un tube d'évacuation situé au bas de la cuve inférieure, l'électrolyte étant régénéré à l'extérieur de l'enceinte après son évacuation et avant d'être réinjecté par le tube d'alimentation, l'électrolyte à l'intérieur de l'enceinte étant entraîné dans un mouvement hélicoidal descendant au niveau de l'alésage de la pièce, et qu'on fait circuler simultanément un courant continu entre d'une part un rideau d'anodes disposées face à l'alésage symétriquement autour de l'axe des cuves et d'autre part la pièce de grandes dimensions servant de cathode.The method according to the invention is characterized in that the large part is arranged and centered between an upper tank and a lower tank having a common vertical axis of symmetry so that the bore has its axis of symmetry coincides with the axis of the tanks and that the two tanks and the part define an enclosure inside which the bore is arranged and - outside which protrudes the peripheral part of the part, which said enclosure is filled with electrolyte and the electrolyte is rapidly circulated between a supply tube opening into said enclosure and an evacuation tube located at the bottom of the lower tank, the electrolyte being regenerated outside the enclosure after its evacuation and before being reinjected by the supply tube, the electrolyte inside the enclosure being driven in a helical movement descending at the level of the bore of the part, and that a direct current is circulated simultaneously between on the one hand a curtain of anodes arranged opposite the bore symmetrically around the axis of the tanks and on the other hand the large part serving as a cathode.

L'invention a également trait à un dispositif permettant de mettre en oeuvre le procédé ci-dessus qui est caractérisé en ce qu'il comporte

  • - un socle muni d'une cuve inférieure de révolution d'axe vertical
  • - une cuve supérieure de révolution de même axe que celui de la cuve inférieure,
  • - les deux cuves étant disposées en regard l'une de l'autre et définissant avec la pièce située entre les deux une enceinte pouvant être remplie d'électrolyte à l'intérieur de laquelle se trouve l'alésage dont l'axe se confond avec l'axe des cuves tandis que la partie périphérique de la pièce située autour de l'alésage dépasse à l'extérieur de ladite enceinte,
  • - des moyens d'étanchéité entre la cuve inférieure et la pièce et entre la pièce et la cuve supérieure,
  • - des moyens d'alimentation en électrolyte débouchant sur l'axe ou d'une façon symétrique par rapport à l'axe à l'intérieur de l'alésage et envoyant l'électrolyte vers le haut,
  • - des moyens d'évacuation de l'électrolyte situés au bas de la cuve inférieure,
  • - des moyens pour faire circuler en continu l'électrolyte et pour le régénérer situés entre les moyens d'évacuation et les moyens d'ali mentation,
  • - un rideau d'anodes constituées du métal à déposer et disposées à l'intérieur de l'alésage d'une façon symétrique autour de l'axe des deux cuves, la pièce de grandes dimensions servant de cathode,
  • - une communication avec l'extérieur située à la partie supérieure de l'enceinte.
The invention also relates to a device making it possible to implement the above method which is characterized in that it comprises
  • - a base provided with a lower tank of revolution of vertical axis
  • - an upper tank of revolution with the same axis as that of the lower tank,
  • - the two tanks being arranged opposite one another and defining with the part located between the two an enclosure that can be filled with electrolyte inside which is the bore whose axis coincides with the axis of the tanks while the peripheral part of the part located around the bore projects outside of said enclosure,
  • - sealing means between the lower tank and the room and between the room and the upper tank,
  • means for supplying electrolyte opening on the axis or in a symmetrical manner with respect to the axis inside the bore and sending the electrolyte upwards,
  • - means for discharging the electrolyte located at the bottom of the lower tank,
  • - means for continuously circulating the electrolyte and for regenerating it located between the discharge means and the supply means mention,
  • - an anode curtain made of the metal to be deposited and arranged inside the bore in a symmetrical manner around the axis of the two tanks, the large part serving as a cathode,
  • - communication with the outside located at the top of the enclosure.

Grâce au dispositif selon l'invention, seule la partie centrale de la pièce est plongée dans le bain d'électrolyte. Ainsi on n'a pas plongé les parties périphériques de la pièce qui peut être délicate dans l'électrolyte et de plus, sans précaution spéciale, on a empêché le dépôt du métal sur cette partie périphérique.Thanks to the device according to the invention, only the central part of the part is immersed in the electrolyte bath. Thus, the peripheral parts of the part, which can be delicate in the electrolyte, have not been immersed and, moreover, without special precautions, the deposition of the metal on this peripheral part has been prevented.

Enfin le dispositif selon l'invention est constitué avec des cuves de dimensions réduites qui ne doivent pas contenir la totalité de la pièce de grandes dimensions.Finally, the device according to the invention consists of tanks of reduced dimensions which must not contain the whole of the large part.

On connaît un dispositif et procédé permettant de déposer une couche de métal à l'intérieur de l'alésage d'une pièce de métal par exemple par le document US-A 4.111.761.A device and method is known for depositing a layer of metal inside the bore of a piece of metal, for example from document US-A 4,111,761.

Dans le dispositif connu la pièce est entourée d'une enceinte de plus grand diamètre qui est serrée entre un couvercle inférieur et un couvercle supérieur. Dans ce dispositif la circulation de l'électrolyte se fait par injection tantôt dans le couvercle supérieur tantôt dans le couvercle inférieur si bien qu'il se produit le long de l'alésage de petites dimensions une circulation de l'électrolyte alternativement dans le sens descendant et dans le sens montant.In the known device, the part is surrounded by a larger diameter enclosure which is clamped between a lower cover and an upper cover. In this device the circulation of the electrolyte is done by injection sometimes in the upper cover sometimes in the lower cover so that there occurs along the bore of small dimensions a circulation of the electrolyte alternately in the downward direction and in the upward direction.

Dans le dispositif et le procédé selon l'invention grâce à la circulation hélicoidale de l'électrolyte et par la disposition symétrique par rapport à l'axe des anodes et de l'injection d'électrolyte on obtient dans l'alésage un dépôt très régulier et disposé dans le sens périphérique.Un tel dépôt permet une grande résistance aux efforts lorsque la pièce montée sur un arbre est entraînée en rotation.In the device and the method according to the invention thanks to the helical circulation of the electrolyte and by the symmetrical arrangement with respect to the axis of the anodes and of the electrolyte injection, a very regular deposit is obtained in the bore. and disposed in the peripheral direction. Such a deposit allows great resistance to forces when the part mounted on a shaft is rotated.

Selon une réalisation de l'invention les moyens servant à entraîner l'électrolyte dans un mouvement hélicoïdal au voisinage de l'alésage comportent un anneau d'axe vertical confondu avec l'axe des cubes et situé légèrement au dessus de l'alésage, le diamètre de l'anneau étant inférieur à celui de l'alésage, ledit anneau étant percé de petits orifices disposés sur un cercle et projetant de l'air comprimé vers l'intérieur de l'alésage dans des directions D se déduisant l'une de l'autre par une rotation autour de l'axe vertical, chacune faisant un angle b avec un plan vertical passant par l'orifice considéré, l'air insufflé étant évacué par une communication avec l'extérieur située à la partie supérieure de l'enceinte.According to one embodiment of the invention, the means serving to drive the electrolyte in a helical movement in the vicinity of the bore comprise a ring of vertical axis coinciding with the axis of the cubes and situated slightly above the bore, the diameter of the ring being lower than that of the bore, said ring being pierced with small orifices arranged on a circle and projecting compressed air towards the inside of the bore in directions D deducing from one of the other by a rotation around the vertical axis, each making an angle b with a vertical plane passing through the orifice considered, the blown air being evacuated by communication with the outside located at the upper part of the enclosure.

Pour améliorer la régularité du mouvement hélicoïdal, on adjoint à l'anneau supérieur un anneau inférieur symétrique par rapport au centre de l'alésage.To improve the regularity of the helical movement, a lower ring symmetrical with respect to the center of the bore is added to the upper ring.

Afin de favoriser la circulation de l'électrolyte au contact de l'alésage, on utilise des moyens situés dans la cuve inférieure dans l'axe des cuves pour imprimer à l'électrolyte, au voisinage de l'axe et qui aurait tendance à rester stagnant, un mouvement ascendant.In order to promote the circulation of the electrolyte in contact with the bore, means are used located in the lower tank in the axis of the tanks to imprint the electrolyte, in the vicinity of the axis and which would tend to remain stagnant, an upward movement.

Selon l'invention le dispositif comporte de préférence des moyens permettant de maintenir la température de l'électrolyte à l'intérieur de l'enceinte à un niveau constant. Ces moyens comportent par exemple une sonde permettant de détecter la température et une résistance électrique dont la mise en marche est réalisée chaque fois que la température détectée par la sonde tombe en dessous d'un niveau déterminé.According to the invention, the device preferably comprises means making it possible to maintain the temperature of the electrolyte inside the enclosure at a constant level. These means comprise for example a probe making it possible to detect the temperature and an electrical resistance, the starting of which is carried out each time the temperature detected by the probe falls below a determined level.

Le métal à déposer sera en général du nickel pur ayant un pourcentage de soufre inférieur à 0,01%.The metal to be deposited will generally be pure nickel having a percentage of sulfur of less than 0.01%.

L'invention va maintenant être décrite plus en détail en se référant à un mode de réalisation particulier cité à titre d'exemple non limitatif et représenté par les dessins annexés.The invention will now be described in more detail with reference to a particular embodiment cited by way of nonlimiting example and represented by the accompanying drawings.

  • La figure 1 représente un dispositif selon l'invention.Figure 1 shows a device according to the invention.
  • La figure 2 représente une vue partielle dudit dispositif à savoir de l'anneau supérieur disposé au dessus de l'alésage.2 shows a partial view of said device, namely the upper ring disposed above the bore.
  • Les figures 3 et 4 représentent deux vues d'une variante de réalisation des orifices d'un anneau selon la figure 2.FIGS. 3 and 4 represent two views of an alternative embodiment of the orifices of a ring according to FIG. 2.

Sur la figure 1 on a représenté un disque de rotor de turbine 1 comportant dans sa région centrale un alésage ou partie femelle 2 de révolution destinée à être frettée sur un arbre. La surface de l'alésage 2 a été préparée au préalable par exemple par grenaillage.In Figure 1 there is shown a turbine rotor disc 1 comprising in its central region a bore or female part 2 of revolution intended to be hooped on a shaft. The surface of bore 2 has been prepared beforehand, for example by shot blasting.

Le disque 1 est centré entre une cuve inférieure 3 et une cuve supérieure 4 se faisant face et admettant un même axe vertical de symétrie. L'axe de l'alésage 2 est alors confondu avec l'axe des cuves 3 et 4. La cuve inférieure 3 comporte une partie cylindrique- placée au dessus d'une partie cônique 6 dont la pointe est dirigée vers le bas. La partie cylindrique de la cuve 3 et la partie conique 6 sont reliées à un socle 7.The disc 1 is centered between a lower tank 3 and an upper tank 4 facing each other and admitting the same vertical axis of symmetry. The axis of the bore 2 is then merged with the axis of the tanks 3 and 4. The lower tank 3 has a cylindrical part placed above a conical part 6, the point of which is directed downwards. The cylindrical part of the tank 3 and the conical part 6 are connected to a base 7.

Les cuves 3 et 4 définissent avec la pièce 1 une enceinte 8 à l'intérieur de laquelle se trouve l'alésage 2 et à l'extérieur de laquelle dépasse la partie périphérique 9 de la pièce 1.The tanks 3 and 4 define, with the part 1, an enclosure 8 inside of which is the bore 2 and outside of which protrudes the peripheral part 9 of the part 1.

On a placé entre la pièce 1 et la cuve supérieure 4 des moyens d'étanchéité constitués d'un joint torique plat 10 résistant à l'électrolyte en dessus et en dessous duquel sont disposés deux joints toriques creux de section circulaire 11.Sealing means consisting of a flat O-ring 10 resistant to the electrolyte above and below which two hollow O-rings of circular section 11 are placed are placed between the piece 1 and the upper tank 4.

De même entre la cuve inférieure 3 et la pièce 1 on a placé des moyens d'étanchéité constitués d'un joint torique plat 12 résistant à l'électrolyte en dessus et en dessous duquel sont disposés deux joints toriques creux de section circulaire 13.Likewise, between the lower tank 3 and the part 1, sealing means consisting of a flat O-ring 12 resistant to the electrolyte have been placed above and below which two hollow O-rings of circular section 13 are arranged.

Un rideau d'anodes 14 en nickel est disposé selon les génératrices d'un cylindre dont l'axe est confondu avec l'axe des cuves. Ces anodes 14 sont fixées au couvercle 5 de la cuve supérieure 4 et descendent jusqu'au bas de la partie cylindrique de la cuve inférieure 3 de façon que l'alésage 2 soit traversé de part en part par ces anodes 14.A curtain of nickel anodes 14 is arranged along the generatrices of a cylinder whose axis coincides with the axis of the tanks. These anodes 14 are fixed to the cover 5 of the upper tank 4 and descend to the bottom of the cylindrical part of the lower tank 3 so that the bore 2 is traversed right through by these anodes 14.

Un tube vertical 15 est disposé sur l'axe des cuves et fixé au couvercle 5 de la cuve supérieure 4. Ce tube servant à l'alimentation en électrolyte débouche au milieu de l'alésage 2 par une pomme 15' envoyant l'électrolyte vers le haut.A vertical tube 15 is disposed on the axis of the tanks and fixed to the cover 5 of the upper tank 4. This tube serving for the supply of electrolyte opens out in the middle of the bore 2 by an apple 15 'sending the electrolyte to the top.

La cuve inférieure 3 est munie dans sa partie inférieure d'un orifice d'évacuation 16 de l'électrolyte.The lower tank 3 is provided in its lower part with an evacuation orifice 16 of the electrolyte.

Juste au dessus de l'alésage 2 et juste en dessous sont dispo sés deux anneaux tubulaires 17, 17' d'axe vertical confondu avec l'axe des cuves. Les anneaux sont disposés symétriquement par rapport au plan horizontal passant par le centre de l'alésage ; ils ont un diamètre inférieur au plus petit diamètre d'alésage qu'il est possible de traiter avec le,dispositif.Just above the bore 2 and just below are provided two tubular rings 17, 17 'of vertical axis merged with the axis of the tanks. The rings are arranged symmetrically with respect to the horizontal plane passing through the center of the bore; they have a diameter less than the smallest bore diameter that can be treated with the device.

Ces anneaux 17, 17' creux servent à amener de l'air sous pression, et sont alimentés par des arrivées 19 en gaz sous pression.These hollow rings 17, 17 ′ serve to supply pressurized air, and are supplied by pressurized gas inlets 19.

L'anneau supérieur 17 comporte de multiples orifices 18 situés sur un cercle d'axe vertical et envoyant de l'air comprimé vers l'intérieur de l'alésage.The upper ring 17 has multiple orifices 18 situated on a circle with a vertical axis and sending compressed air towards the interior of the bore.

La direction D dans laquelle l'air est éjecté par un orifice M particulier 18 fait un angle b avec le plan vertical V passant par l'axe des cuves et le point M et est située dans un plan faisant un angle a avec le plan horizontal et 90° avec le plan vertical V (voir figure 2). Les angles a et b peuvent par exemple être pris voisins de 45°.The direction D in which the air is ejected by a particular orifice M makes an angle b with the vertical plane V passing through the axis of the tanks and the point M and is located in a plane making an angle a with the horizontal plane and 90 ° with the vertical plane V (see Figure 2). The angles a and b can for example be taken close to 45 °.

Les directions D des différents orifices se déduisent les unes des autres par rotation autour de l'axe des cuves.The directions D of the different orifices are deduced from each other by rotation about the axis of the tanks.

Grace à l'air sous pression éjecté par les orifices 18 de l'anneau 17, l'électrolyte éjecté par la pomme 15' est animé d'un mouvement hélicoidal descendant, lorsque le régime est établi.Thanks to the pressurized air ejected through the orifices 18 of the ring 17, the electrolyte ejected by the apple 15 'is driven in a downward helical movement, when the speed is established.

L'anneau 17' inférieur symétrique de l'anneau supérieur 17 et dont les orifices 18' insufflent l'air dans des directions D' également symétriques par rapport au plan horizontal, tendrait s'il était seul à imposer un mouvement hélicoidal ascendant à l'électrolyte. gais en raison de la circulation de l'électrolyte entre dispositif d'alimentation et d'évacuation et de l'action de l'anneau supérieur 17, l'anneau inférieur n'a pour effet que de régulariser le mouvement hélicoïdal descendant de l'électrolyte le long des parois de l'alésage.The lower ring 17 'symmetrical with the upper ring 17 and whose orifices 18' breathe air in directions D 'also symmetrical with respect to the horizontal plane, would tend if it were alone to impose an upward helical movement on the 'electrolyte. due to the circulation of the electrolyte between the supply and discharge device and the action of the upper ring 17, the lower ring only has the effect of regulating the downward helical movement of the electrolyte along the bore walls.

Pour réaliser plus facilement les orifices 18 au lieu de les forer dans la direction D, on les fore axialement dans une direction faisant un angle a avec le plan horizontal puis on vient souder au voisinage de chaque orifice M des cuillères 28 imposant un angle de déviation b dans un plan perpendiculaire au plan axial passant par le point M (voir figure 3 qui représente une coupe longitudinale de l'anneau au niveau du point M et la figure 4 une vue de dessus).To make the orifices 18 more easily, instead of drilling them in the direction D, they are drilled axially in a direction making an angle a with the horizontal plane, then the spoons 28 are welded in the vicinity of each orifice M imposing a deflection angle b in a plane perpendicular to the axial plane passing through point M (see FIG. 3 which represents a longitudinal section of the ring at the point M and FIG. 4 a top view).

Dans l'axe de la cuve inférieure 3 on a prévu un tube d'arrivée d'air comprimé 20 relié à une buse 21 débouchant dans la cuve inférieure sur l'axe et percée de multiples trous insufflant l'air de bas en haut. Ainsi l'électrolyte stagnant dans la partie axiale de l'alésage est remis dans la circulation.In the axis of the lower tank 3 is provided a compressed air inlet tube 20 connected to a nozzle 21 opening into the lower tank on the axis and pierced with multiple holes blowing the air from bottom to top. Thus the electrolyte stagnating in the axial part of the bore is returned to the circulation.

Dans le couvercle 5 de la cuve supérieure 4 est prévu un bouchon 22 laissant s'échapper les gaz.In the cover 5 of the upper tank 4 is provided a plug 22 allowing the gases to escape.

Une sonde thermométrique 23 est disposée à l'intérieur de l'enceinte 8 et est reliée à un générateur 24 qui envoie un courant dans une résistance électrique chauffante 25 située dans la cuve inférieure lorsque la température de l'électrolyte s'écarte de 1°C par rapport à la température fixée.A thermometric probe 23 is disposed inside the enclosure 8 and is connected to a generator 24 which sends a current to an electric heating resistor 25 located in the lower tank when the temperature of the electrolyte deviates by 1 ° C relative to the set temperature.

L'enceinte 8 est remplie d'électrolyte jusqu'au dessus de l'anneau supérieur 17. L'électrolyte ne doit pas atteindre le bouchon 22.The enclosure 8 is filled with electrolyte up to the top of the upper ring 17. The electrolyte must not reach the plug 22.

Entre l'orifice d'évacuation 16 de l'électrolyte et le tube d'alimentation 15 sont disposés un circuit de régénération du bain d'électrolyte 26 et un système de pompe et de vanne 27 pour injecter en continu de l'électrolyte régénéré. Les circuits de régénération et de circulation d'électrolyte étant classiques ne seront pas décrits.Between the discharge port 16 of the electrolyte and the supply tube 15 are disposed a circuit for regenerating the electrolyte bath 26 and a pump and valve system 27 for continuously injecting regenerated electrolyte. The electrolyte regeneration and circulation circuits being conventional will not be described.

Le bain d'électrolyte peut être un bain de Watts classique à base de 3 sels

  • - sulfate de nickel hydraté 7H20
  • - chlorure de nickel hydraté 6H20
  • - acide borique B0 3 H 3
The electrolyte bath can be a conventional Watts bath based on 3 salts
  • - hydrated nickel sulfate 7H 2 0
  • - hydrated nickel chloride 6H 2 0
  • - boric acid B0 3 H 3

Il.peut être également un bain au sulfamate comportant

  • - sulfamate de nickel
  • - acide sulfamique
  • - acide borique (pour tamponnage)
It can also be a sulfamate bath comprising
  • - nickel sulfamate
  • - sulfamic acid
  • - boric acid (for buffering)

Ce dernier bain présente des vitesses de dépôt plus élevées.This latter bath has higher deposition rates.

Dans le dispositif selon l'invention et selon le procédé selon l'invention, on fait circuler un courant continu entre les anodes 14 et la pièce 1 servant de cathode. Le nickel des anodes vient se déposer sur la partie de la pièce située à l'intérieur de l'enceinte.In the device according to the invention and according to the method according to the invention, a direct current is circulated between the anodes 14 and part 1 serving as a cathode. The nickel from the anodes is deposited on the part of the part located inside the enclosure.

Dans le bain d'électrolyte la pellicule cathodique s'appauvrit à mesure que le nickel se dépose, il faut donc faire une circulation d'électrolyte élevée d'autant plus que le volume intérieur de l'enceinte qui contient l'électrolyte est faible compte-tenu. de la surface à revêtir et surtout de l'épaisseur importante que l'on désire déposer. Pour que le dépôt de nickel soit régulier l'électrolyte est injecté symétriquement dans l'alésage et le bain est entraîné au voisinage de l'alésage hélicoidalement par les jets d'air comprimé issus des anneaux 17, 17'.In the electrolyte bath the cathode film becomes depleted as the nickel is deposited, it is therefore necessary to make a high electrolyte circulation all the more since the interior volume of the enclosure which contains the electrolyte is low. -tenuous. of the surface to be coated and above all of the large thickness which it is desired to deposit. So that the nickel deposition is regular, the electrolyte is injected symmetrically into the bore and the bath is driven in the vicinity of the bore helically by the jets of compressed air coming from the rings 17, 17 '.

D'autre part grâce à la buse 21 il n'y a pas de stagnation de l'électrolyte dans la région axiale de l'alésage. Le gaz comprimé issu de la buse 21 et des anneaux 17 s'échappe par le bouchon 22.On the other hand thanks to the nozzle 21 there is no stagnation of the electrolyte in the axial region of the bore. The compressed gas from the nozzle 21 and the rings 17 escapes through the plug 22.

Claims (9)

1/ Procédé de dépôt métallique sur un alésage (2) de révolution de grand diamètre traversant de part en part la partie centrale d'une pièce de grandes dimensions (1) caractérisé en ce qu'on dispose et centre la pièce de grandes dimensions (1) entre une cuve supérieure (4) et une cuve inférieure (3) ayant un axe de symétrie vertical commun de façon que l'alésage (2) ait son axe de symétrie confondu avec l'axe des cuves (3, 4) et que les deux cuves (3, 4) et la pièce (1) définissent une enceinte (8) à l'intérieur de laquelle soit disposé l'alésage (2) et à l'extérieur de laquelle dépasse la partie périphérique (9) de la pièce (1), qu'on remplit ladite enceinte (8) d'électrolyte et on fait circuler rapidement l'électrolyte entre un tube d'alimentation (15) débouchant dans ladite enceinte (8) et un tube d'évacuation (16) situé au bas de la cuve inférieure (3), l'électrolyte étant régénéré à l'extérieur de l'enceinte (8) après son évacuation et avant d'être réinjecté par le tube d'alimentation(15), l'électrolyte à l'intérieur de l'enceinte (8) étant entraîné dans un mouvement hélicoidal descendant au niveau de l'alésage (2) de la pièce (1), qcon fait circuler simultanément un courant continu entre d'une part un rideau d'anodes (14) disposées face à l'alésage (2) symétriquement autour de l'axe des cuves (3, 4) et d'autre part la pièce de grandes dimensions (1) servant de cathode.1 / Method of metallic deposition on a large diameter revolution bore (2) passing right through the central part of a large part (1) characterized in that the large part is arranged and centered ( 1) between an upper tank (4) and a lower tank (3) having a common vertical axis of symmetry so that the bore (2) has its axis of symmetry coincident with the axis of the tanks (3, 4) and that the two tanks (3, 4) and the part (1) define an enclosure (8) inside which the bore (2) is arranged and outside which projects the peripheral part (9) of the part (1), which fills said enclosure (8) with electrolyte and the electrolyte is rapidly circulated between a supply tube (15) opening into said enclosure (8) and a discharge tube (16 ) located at the bottom of the lower tank (3), the electrolyte being regenerated outside the enclosure (8) after its evacuation and before being reinjected by the feed tube ion (15), the electrolyte inside the enclosure (8) being driven in a helical movement descending at the bore (2) of the part (1), qcon simultaneously circulates a direct current between on the one hand a curtain of anodes (14) arranged opposite the bore (2) symmetrically around the axis of the tanks (3, 4) and on the other hand the large part (1) serving as cathode . 2/ Dispositif de dépôt métallique sur un alésage (2) de révolution de grand diamètre traversant de part en part la partie centrale d'une pièce de grandes dimensions (1), caractérisé en ce qu'il comporte - un socle (17) muni d'une cuve inférieure (3) de révolution d'axe vertical, - une cuve supérieure (4) de révolution de même axe que celui de la cuve inférieure (3), - les deux cuves (3, 4) étant disposées en regard l'une de l'autre et définissant avec la pièce (1) située entre les deux une enceinte (8) pouvant être remplie d'électrolyte à l'intérieur de laquelle se trouve l'alésage (2) dont l'axe se confond avec l'axe des cuves (3, 4) tandis que la partie périphérique (9) de la pièce (1) située, autour de l'alésage (2) dépasse à l'extérieur de ladite .,enceinte (8), - des moyens d'étanchéité (10, 11, 12, 13) entre la cuve inférieure (3) et la pièce (1) et entre la pièce (1) et la cuve supérieure (4), - des moyens d'alimentation (15, 15') en électrolyte débouchant sur l'axe ou d'une façon symétrique par rapport à l'axe à l'intérieur de l'alésage (2) et envoyant l'électrolyte vers le haut. - des moyens d'évacuation (16) de l'électrolyte situés au bas de la cuve inférieure (3), - des moyens pour faire circuler en continu l'électrolyte (26, 27) et pour le régénérer situés entre les moyens d'évacuation (16) et les moyens d'alimentation (15, 15'), - un rideau d'anodes (14) constituées du métal à déposer et disposées à l'intérieur de l'alésage (2), d'une façon symétrique autour de l'axe des deux cuves (3, 4), la pièce de grandes dimensions (1) servant de cathode, - des moyens (17, 17') servant à entraîner l'électrolyte au voisinage de l'alésage (2), dans un mouvement hélicoïdal descendant. 2 / Metal deposition device on a large diameter revolution bore (2) passing right through the central part of a large part (1), characterized in that it comprises - a base (17) provided with a lower tank (3) of revolution of vertical axis, - an upper tank (4) of revolution with the same axis as that of the lower tank (3), - the two tanks (3, 4) being arranged opposite one another and defining with the part (1) located between the two an enclosure (8) which can be filled with electrolyte inside which finds the bore (2) whose axis merges with the axis of the tanks (3, 4) while the peripheral part (9) of the part (1) located around the bore (2) exceeds the outside of said., enclosure (8), - sealing means (10, 11, 12, 13) between the lower tank (3) and the part (1) and between the part (1) and the upper tank (4), - electrolyte supply means (15, 15 ′) opening on the axis or in a symmetrical manner with respect to the axis inside the bore (2) and sending the electrolyte upwards . - means for discharging (16) the electrolyte located at the bottom of the lower tank (3), - means for continuously circulating the electrolyte (26, 27) and for regenerating it located between the discharge means (16) and the supply means (15, 15 '), - an anode curtain (14) made of the metal to be deposited and arranged inside the bore (2), in a symmetrical manner around the axis of the two tanks (3, 4), the part of large dimensions (1) serving as cathode, - Means (17, 17 ') for driving the electrolyte in the vicinity of the bore (2), in a downward helical movement. 3/ Dispositif selon la revendication 2, caractérisé en ce que les moyens servant à entraîner l'électrolyte dans un mouvement hélicoidal au voisinage de l'alésage (2) comportent un anneau d'axe vertical (7) confondu avec l'axe des cubes et situé légèrement au dessus de l'alésage (2), le diamètre de l'anneau (17) étant inférieur à celui de l'alésage (2) , ledit anneau (17) étant percé de petits orifices (18) disposés sur un cercle et projetant de l'air comprimé vers l'intérieur de l'alésage (2) dans des directions D se déduisant l'une de l'autre par une rotation autour de l'axe vertical, chacune faisant un angle b avec le plan vertical passant par l'orifice (18) considéré, l'air insufflé étant évacué par une communication avec l'extérieur (22) située à la partie supérieure de l'enceinte (8).3 / Device according to claim 2, characterized in that the means for driving the electrolyte in a helical movement in the vicinity of the bore (2) comprise a ring of vertical axis (7) coincident with the axis of the cubes and located slightly above the bore (2), the diameter of the ring (17) being less than that of the bore (2), said ring (17) being pierced with small orifices (18) arranged on a circle and projecting compressed air towards the inside of the bore (2) in directions D deducted from each other by a rotation around the vertical axis, each making an angle b with the plane vertical passing through the orifice (18) considered, the blown air being evacuated by communication with the outside (22) located at the top of the enclosure (8). 4/ Dispositif selon la revendication 3, caractérisé en ce que les moyens servant à entrainer l'électrolyte dans un mouvement hélicoidal comportent un anneau inférieur (17') symétrique de l'anneau supérieur (17) par rapport à un plan horizontal passant par le point central de l'alésage (2).4 / Device according to claim 3, characterized in that the means for driving the electrolyte in a movement helical comprise a lower ring (17 ') symmetrical with the upper ring (17) relative to a horizontal plane passing through the central point of the bore (2). 5/ Dispositif selon l'une des revendications 2 à 4, caractérisé en ce qu'il comporte des moyens (21) situés dans la cuve inférieure (3) dans l'axe des cuves (3, 4) pour imprimer à l'électrolyte, au voisinage de l'axe, un mouvement ascendant.5 / Device according to one of claims 2 to 4, characterized in that it comprises means (21) located in the lower tank (3) in the axis of the tanks (3, 4) for printing with the electrolyte , in the vicinity of the axis, an upward movement. 6/ Dispositif selon l'une des revendications 2 à 5, caractérisé en ce qu'il comporte des moyens (23, 24, 25) permettant de maintenir la température de l'électrolyte à l'intérieur de l'enceinte (8) à un niveau constant.6 / Device according to one of claims 2 to 5, characterized in that it comprises means (23, 24, 25) for maintaining the temperature of the electrolyte inside the enclosure (8) at a constant level. 7/ Dispositif selon la revendication 6, caractérisé en ce que les moyens permettant de maintenir la température de l'électrolyte à un niveau constant comportent une sonde (23) permettant de détecter la température, et une résistance électrique (25) dont la mise en marche est réalisée chaque fois que la température détectée par la sonde(23) tombe en dessous d'un niveau déterminé.7 / Device according to claim 6, characterized in that the means for maintaining the temperature of the electrolyte at a constant level comprise a probe (23) for detecting the temperature, and an electrical resistance (25) whose setting on is carried out each time the temperature detected by the probe (23) falls below a determined level. 8/ Dispositif selon l'une des revendications précédentes, caractérisé en ce que les anodes (14) sont constituées en nickel.8 / Device according to one of the preceding claims, characterized in that the anodes (14) are made of nickel. 9/ Dispositif selon la revendication 8, caractérisé en ce que le nickel comporte un pourcentage de soufre inférieur à 0,01%.9 / Device according to claim 8, characterized in that the nickel has a percentage of sulfur less than 0.01%.
EP81102095A 1980-03-27 1981-03-20 Method and apparatus for metal plating of cylindric bores with large diameter extending across the central part of a work piece having large dimensions Expired EP0037033B1 (en)

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AT81102095T ATE5267T1 (en) 1980-03-27 1981-03-20 METHOD AND APPARATUS FOR DEPOSITIONING METALS ON A LARGE DIAMETER CYLINDRICAL HOLE PASSING THROUGH THE CENTRAL PART OF A LARGE DIMENSION WORKPIECE.

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FR8006834 1980-03-27
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BE791006A (en) * 1971-11-09 1973-05-07 Citroen Sa DEVICE AND METHOD FOR MAKING A COATING, IN PARTICULAR ELECTROLYTIC, ON WALLS OF EXPOSED ORGANS, IN SERVICE, TO FRICTION FORCES
US4279706A (en) * 1980-03-27 1981-07-21 Alsthom-Atlantique Method and assembly for depositing a metal on a cylindrical bore which passes through a central portion of a large part

Patent Citations (3)

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FR825071A (en) * 1937-04-27 1938-02-23 Device for doubling cylinders and machine bearings
FR872273A (en) * 1940-04-06 1942-06-03 Adlerwerke Kleyer Ag H Anode for the precipitation of chromium layers on the inner wall of hollow bodies
US4111761A (en) * 1977-11-07 1978-09-05 General Motors Corporation Method and apparatus for flow-through plating including pneumatic electrolyte shuttling system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2563540A1 (en) * 1984-04-26 1985-10-31 Alsthom Atlantique DEVICE FOR CARRYING OUT A METAL DEPOSIT ON THE FRICTING PARTS OF A TURBINE ROTOR
EP0165408A1 (en) * 1984-04-26 1985-12-27 Alsthom Apparatus for depositing metal on the frictional part of a turbine rotor
FR2583070A1 (en) * 1985-06-11 1986-12-12 Limburgs Galvano Tech Bedri Process for protecting steel components, in particular hydraulic cylinders, against wear and corrosion.

Also Published As

Publication number Publication date
RO81918A (en) 1984-02-21
YU77981A (en) 1983-06-30
DE3161353D1 (en) 1983-12-15
EP0037033B1 (en) 1983-11-09
ZA812072B (en) 1982-06-30
JPS5719394A (en) 1982-02-01
US4279706A (en) 1981-07-21
RO81918B (en) 1984-02-28
ATE5267T1 (en) 1983-11-15
US4345977A (en) 1982-08-24

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