EP0165408B1 - Vorrichtung zur Herstellung einer Metallschicht auf den Gleitschichten eines Turbinenläufers - Google Patents

Vorrichtung zur Herstellung einer Metallschicht auf den Gleitschichten eines Turbinenläufers Download PDF

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Publication number
EP0165408B1
EP0165408B1 EP85104889A EP85104889A EP0165408B1 EP 0165408 B1 EP0165408 B1 EP 0165408B1 EP 85104889 A EP85104889 A EP 85104889A EP 85104889 A EP85104889 A EP 85104889A EP 0165408 B1 EP0165408 B1 EP 0165408B1
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EP
European Patent Office
Prior art keywords
axis
electrolyte
vat
anodes
conduits
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP85104889A
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English (en)
French (fr)
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EP0165408A1 (de
Inventor
André Coulon
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.)
Alstom SA
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Alstom SA
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Filing date
Publication date
Application filed by Alstom SA filed Critical Alstom SA
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    • 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 to a device for carrying out a metallic deposit on the rubbing parts of a turbine rotor as well as to its use for carrying out a deposit of chromium.
  • Turbine rotors operating at high temperatures must be made of creep-resistant steel.
  • a metallic coating preferably chromium
  • the device for carrying out the metal deposition makes it possible to obtain very low coefficients of friction thanks to the regularity of the deposition carried out.
  • Document EP-A-37033 discloses a device making it possible to deposit a metal coating on the hub of a rotor disc, said device comprising a tank with vertical axis 00 ′ consisting of a cylindrical part terminated by a conical part, said tank being filled with electrolyte, first means for supplying the tank with electrolyte and disposed towards the top of said tank, second means for discharging the electrolyte situated at the bottom of the tank, third means for regenerating and circulating the 'electrolyte located between the second means and the first means, fourth means for supporting a curtain of metal anodes to be deposited and for driving the electrolyte in rotation about the axis 00', fifth means for bringing a current of polarity given to the anode curtain.
  • the electrolyte is driven centrifugally by the fourth means to come and settle on the hub.
  • the electrolyte must be driven in a centripetal manner to come to deposit on the friction parts of the rotor located on the axis 00 '.
  • the fourth means consist of two cylindrical half-shells of axis 00 'each comprising an armature in the form of a semicircle on which the anodes are fixed in parallel to the axis 00 ', said anodes being surrounded externally by hollow tubes parallel to 00' connected together by hollow pipes also in the shape of a semicircle and supplied with compressed gas, the pipes and the reinforcements being secured by insulators , the tubes and the conduits being provided with nozzles ejecting the compressed gas in a horizontal direction making an angle close to 45 ° with the horizontal direction joining the nozzle considered to the axis 00 '.
  • the current is pulsed, which improves the homogeneity of the deposited chromium as well as its adhesion.
  • the device according to the invention (see FIG. 1) comprises a tank 1 comprising a cylindrical part 2 with a vertical axis 00 'surmounting a conical part 3 with the same axis. At the bottom of the conical part 3 is disposed a quick-drain evacuation system 4.
  • the tank 1 is provided with a cover 9 comprising a gas outlet pipe 10 provided with a ventilation and gas treatment system 11.
  • the rotor 12 is suspended by its upper end and its lower end comprising the rubbing parts 13 to be coated is located in the tank 1.
  • the cover 9 is in two parts and has a central opening 14 so as to be able to grip the rotor 12.
  • the rotor 12 has its axis coincident with the axis 00 '.
  • the half-rings have at one end a hinge 19 and at the other a locking means 20 for locking them together (see Figure 5).
  • Each half-shell 16 also comprises parallel tubes 21 to the axis 00 'joined by conduits 22 forming half-rings at the lower and upper part of the half-shells.
  • the upper conduits 22 surround the armatures 18 and are connected to them by ceramic insulators 23.
  • the tubes 21 and the pipes 22 are hollow and communicate with each other.
  • One of the pipes 22 is provided with an inlet 24 for compressed gas.
  • the upper pipes 22 on the one hand and the lower pipes on the other hand are connected by a flexible sleeve 25 (see FIG. 3).
  • the tubes 21 are provided with nozzles 26 sending compressed gas in a horizontal direction making an angle substantially equal to 45 ° with the direction connecting the nozzle to the axis 00 '.
  • the pipes 22 are also provided with nozzles 27. These nozzles 27 send compressed gas in a horizontal direction making an angle substantially equal to 45 ° with the direction connecting the nozzle considered to the axis 00 '.
  • the sheath 15 is fixed to the tank 1 by spokes 28 (see Figure 4).
  • the entire sheath accepts the axis 00 'as the axis of symmetry.
  • the anodes 17 are supplied with current by a current supply 29 and are made of metal to be deposited.
  • a temperature probe 30 is placed inside the tank 1 and is connected to a generator 31 which sends a current into an electric heating resistor 32 located at the bottom of the tank 1 when the temperature of the electrolyte deviates from 1 ° C compared to the set temperature.
  • a regeneration circuit 33 of the electrolyte bath Between the electrolyte evacuation system 4 and the supply inlets 7 is arranged a regeneration circuit 33 of the electrolyte bath, a pump and valve system 34 for injecting either continuously or intermittently of the regenerated electrolyte.
  • the anodes are chosen from this metal and the electrolyte is a conventional solution of chromic acid.
  • Certain sodium or calcium hydroxides can be added to it to form tetrachromate salts.
  • Chromic acid can be replaced by trivalent chromium salts, which simplifies the ventilation system.
  • the electrolyte tank After installing the rotor, the electrolyte tank is filled.
  • the bath is driven in a rotary movement of axis 00 '.
  • an alternating current for example a pulse of one second every twenty seconds alternately positive and negative of amplitude lower than the intensity of the direct current, one obtains a homogeneous deposit of trivalent chromium, of compatible hardness with the objectives, while improving performance and grip.
  • the chromium deposit will be between 150 and 200 ⁇ m after rectification. Finally, a degassing oven treatment (180-210 ° C) completes the operating range.
  • the rubbing parts to be coated can be either bristles of bearings as in FIG. 1 or bristles of stops (FIG. 6). In the latter case as in the case of FIG. 1, the anodes are arranged opposite the surfaces to be coated.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Sliding-Contact Bearings (AREA)

Claims (3)

1. Vorrichtung zur Herstellung einer Metallschicht, mit einem Kessel (1) mit senkrechter Achse 00', der aus einem zylindrischen Teil (2) und einem konische Abschlußteil (3) besteht und mit Elektrolyt gefüllt ist, mit ersten Mitteln (7, 8) im oberen Teil des Kessels (1) zur Versorgung des Kessels (1) mit Elektrolyt, mit zweiten Mitteln (4) im unteren Teil des Kessels (1) zur Abführung des Elektrolyten, mit dritten Mitteln (32, 33) im Bereich zwischen den zweiten (4) und den ersten Mitteln (7, 8) zur Regenerierung und Umwälzung des Elektrolyten, mit vierten Mitteln (15) zur Halterung einer Schürze von Anoden (17) aus dem niederzuschlagenden Metall und zur Herbeiführung einer Rotationsbewegung des Elektrolyten um die Achse 00', und mit fünften Mitteln (29) zur Zuführung eines elektrischen Stromes gegebener Polarität an die Anodenschürze (17), dadurch gekennzeichnet, daß die vierten Mittel (15) aus zwei zylindrischen Halbschalen (16) um die Achse 00' bestehen, welche je eine halbkreisförmige Halterung (18) aufweisen, an der die Anoden (17) parallel zur Achse 00' befestigt sind, wobei die Anoden (17) außen von hohlen Rohren (21) umgeben sind, die parallel zur Achse 00' verlaufen und miteinander durch hohle Leitungen (22) von ebenfalls halbkreisförmiger Gestalt verbunden sind und mit Druckgas gespeist werden, und daß die Leitungen (22) und Halterungen (18) durch Isolatoren (23) verankert und die Rohre (21) und Leitungen (22) mit Düsen (26, 27) ausgestattet sind, durch die das Druckgas in eine horizontale Richtung ausgestoßen wird, die einen Winkel von etwa 45° mit der horizontalen Verbindungslinie zwischen der jeweiligen Düse (26, 27) und der Achse 00' einschließt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie Mittel (29) zum Anlegen eines gepulsten Stromes an die Anoden (17) aufweist.
3. Verwendung der Vorrichtung nach einem der vorhergehenden Ansprüche zur Herstellung eines Chromniederschlags.
EP85104889A 1984-04-26 1985-04-23 Vorrichtung zur Herstellung einer Metallschicht auf den Gleitschichten eines Turbinenläufers Expired EP0165408B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8406589A FR2563540B1 (fr) 1984-04-26 1984-04-26 Dispositif pour effectuer un depot metallique sur les parties frottantes d'un rotor de turbine
FR8406589 1984-04-26

Publications (2)

Publication Number Publication Date
EP0165408A1 EP0165408A1 (de) 1985-12-27
EP0165408B1 true EP0165408B1 (de) 1988-08-31

Family

ID=9303523

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104889A Expired EP0165408B1 (de) 1984-04-26 1985-04-23 Vorrichtung zur Herstellung einer Metallschicht auf den Gleitschichten eines Turbinenläufers

Country Status (8)

Country Link
US (1) US4584081A (de)
EP (1) EP0165408B1 (de)
JP (1) JPS60234996A (de)
AT (1) ATE36876T1 (de)
CS (1) CS275930B6 (de)
DE (1) DE3564707D1 (de)
FR (1) FR2563540B1 (de)
ZA (1) ZA853141B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2578859B1 (fr) * 1985-03-12 1989-09-08 Commissariat Energie Atomique Appareillage et installation de realisation d'un depot metallique electrolytique d'epaisseur constante.
JPS638651A (ja) * 1986-06-30 1988-01-14 Fujitsu Ltd 電子写真用磁気ブラシ現像剤
DE69321298T2 (de) * 1992-06-05 1999-04-08 Gec Alsthom Electromecanique S.A., Paris Verfahren zur Herstellung eines Einsatzes auf einem zu beschichtenden Formkörper aus Stahl oder aus Titanlegierung
FR2696760B1 (fr) * 1992-10-09 1994-11-04 Alsthom Gec Revêtement pour parties frottantes par rotation d'une pièce en acier matensitique.
GB9303853D0 (en) * 1993-02-25 1993-04-21 Baj Coatings Ltd Rotor blades
FR2777914B1 (fr) * 1998-04-28 2000-07-13 Traitements De Surface Et Meca Dispositif,procede et installation pour le depot par voie electrolytique sur des pieces de grandes dimmensions
DE102012103846A1 (de) * 2012-05-02 2013-11-07 Ipt International Plating Technologies Gmbh Verstellbare Anode

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3259049A (en) * 1962-12-14 1966-07-05 V & A Plating Supplies Inc Gas agitating device
US3503856A (en) * 1968-01-30 1970-03-31 Rotary Plates Ltd Process for controlling electrodeposition
FR2462490A1 (fr) * 1979-08-03 1981-02-13 Centre Techn Ind Mecanique Dispositif de revetement electrolytique
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

Also Published As

Publication number Publication date
EP0165408A1 (de) 1985-12-27
JPH0514030B2 (de) 1993-02-24
ATE36876T1 (de) 1988-09-15
DE3564707D1 (en) 1988-10-06
ZA853141B (en) 1985-12-24
US4584081A (en) 1986-04-22
FR2563540A1 (fr) 1985-10-31
CS275930B6 (en) 1992-03-18
JPS60234996A (ja) 1985-11-21
FR2563540B1 (fr) 1989-05-05

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