EP1761660A1 - Procede pour enlever un revetement applique sur une piece - Google Patents

Procede pour enlever un revetement applique sur une piece

Info

Publication number
EP1761660A1
EP1761660A1 EP05770315A EP05770315A EP1761660A1 EP 1761660 A1 EP1761660 A1 EP 1761660A1 EP 05770315 A EP05770315 A EP 05770315A EP 05770315 A EP05770315 A EP 05770315A EP 1761660 A1 EP1761660 A1 EP 1761660A1
Authority
EP
European Patent Office
Prior art keywords
coating
removal
compounds
turbine blades
added
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.)
Withdrawn
Application number
EP05770315A
Other languages
German (de)
English (en)
Inventor
Ursus KRÜGER
Ralph Reiche
Raymond Ullrich
Gabriele Winkler
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.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from EP04015424A external-priority patent/EP1612299B1/fr
Priority claimed from DE200410053135 external-priority patent/DE102004053135A1/de
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP05770315A priority Critical patent/EP1761660A1/fr
Publication of EP1761660A1 publication Critical patent/EP1761660A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
    • B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/04—Cleaning involving contact with liquid
    • B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/10—Etching compositions
    • C23F1/14—Aqueous compositions
    • C23F1/16—Acidic compositions
    • C23F1/26—Acidic compositions for etching refractory metals
    • 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
    • C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
    • C23F1/00—Etching metallic material by chemical means
    • C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
    • 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
    • C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
    • C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
    • C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
    • C23G1/10—Other heavy metals
    • C23G1/106—Other heavy metals refractory metals
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings

Definitions

  • the invention relates to a method for removing a coating containing chromium and / or chromium oxide compounds from a component by means of a decoating bath.
  • Such a stripping process can be carried out according to EP 1 094 134 A1, for example by means of an electrochemical process.
  • the component to be stripped is immersed in an electrolyte and thereby forms the working electrode.
  • the layer to be stripped is dissolved on the component.
  • EP 1 314 797, A2 Another method for stripping components is described in EP 1 314 797, A2. This is a chemical stripping process.
  • the component to be stripped is immersed in a solution with hydrochloric acid and an inhibitor which reduces the attack on the base material of the component.
  • the stripping bath formed by the hydrochloric acid causes the dissolution of the coating.
  • turbine blades can be stripped off if they have reached the end of the stated service life. By a subsequent recoating a further life cycle of the turbine blades can be made possible, which is why there is a great interest in an effective stripping of turbine blades.
  • the stripping of turbine blades not only the used coatings, such as MCrAlY coatings or even thermal protective layers (thus Thermal Barrier Coating, hereinafter referred to as TBC), but also impurities arising on the coating during the operating time of the turbine blade, which preferably consist of complex crystalline compounds.
  • TBC thermal protective layers
  • impurities arising on the coating during the operating time of the turbine blade which preferably consist of complex crystalline compounds.
  • Ca-Mg-Al-Si-O system hereinafter referred to CMAS.
  • TGO thermally grown oxides on the base material of the coated component
  • TGO thermally grown oxides on the base material of the coated component
  • B. Cr 2 ⁇ 3 or Cr x Co y O compounds These compounds have a high chemical stability, which is why they can be removed with the decoating only with great effort.
  • such compounds can also be formed during the stripping process, which additionally delays the stripping process.
  • the compounds increasingly occupy the surface of the component to be stripped, which is why the removal rate during stripping decreases with increasing treatment time.
  • EP 1 314 797 A2 it is therefore proposed to carry out the stripping process in several steps, in each case mechanical treatment of the surfaces taking place between the treatment steps, so that the resulting or not yet removed impurities can be removed.
  • the object of the invention is to specify a method for removing coatings containing chromium and / or chromium oxide compounds, which allows short treatment times for the stripping process.
  • This object is achieved by a method for removing a chromium and / or chromium oxide compounds enthal ⁇ border coating of a component, wherein the be ⁇ coated component placed in a stripping bath and is removed again after the treatment time, wherein the decoating bath as an inhibitor an alkanolamine compound or a salt containing these are added.
  • alkanolamine compounds and salts containing them as inhibitors that they not only reduce the attack of the base material of the coated component by the stripping bath, but also suppress the formation of TGO or the dissolution of TGO and CMAS accelerate. This advantageously makes it possible to maintain a stripping process with comparatively high removal rates over a longer treatment period than is possible with the inhibitors used according to the prior art.
  • the method according to the invention can be used more economically, in particular, an interruption of the
  • Decoating process for the purpose of interposition of a me ⁇ chanical processing step omitted or at least the treatment periods between these mechanical processing steps are extended. Overall, this advantageously reduces the process time required for the stripping process, which is why the process can be used more economically. Furthermore, damage to the base material of the coated component due to mechanical processing steps can be avoided, as a result of which the rejects during stripping are reduced, which additionally contributes to improved cost-effectiveness of the method.
  • the use of triethanolamine or one of its salts, such as, for example, is particularly effective.
  • the method according to the invention can be used particularly advantageously in the stripping of turbine blades, in which in particular MCrAlY coatings and / or thermal protective layers can be removed from the turbine blades.
  • the MCrAlY coating often serves as an intermediate layer between the turbine blade and the thermal protection layer (TBC).
  • TBC thermal protection layer
  • the mentioned layer systems can also be removed from any other components, as far as this is necessary (eg of supply pipes for gas turbines).
  • FIGURE shows a diagram which shows the course of various embodiments of the method according to the invention.
  • the exemplary embodiment of the method consisted of removing an MCrAlY coating on turbine blades which had been claimed for operation, wherein a five percent hydrochloric acid was used as the stripping bath. Furthermore, triethanolamine in one percent or two percent concentration was added in parallelteur ⁇ conducted procedures. During the treatment time, the de-coating bath was subjected to ultrasound at a frequency of 36 kHz.
  • the exemplary embodiments of the method according to the invention were an electrochemical stripping, the potential on the turbine blade being kept at 0.100 V SCE or 0.340 V SHE.
  • the diagram shows over the treatment time t in hours h the at the turbine blade measured current I in amperes A. This current can be used as a direct measure of the removal rate at the turbine blade.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Electrochemistry (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un procédé pour enlever des revêtements appliqués sur des pièces telles que des aubes de turbine. Lorsque ces dernières sont parvenues à la fin de leur cycle de vie en tant que produit, les revêtements peuvent être enlevés pour permettre de réutiliser les aubes de turbine après l'application d'un nouveau revêtement sur celles-ci. Selon l'invention, le retrait du revêtement contenant en particulier des composés d'oxyde de chrome s'effectue au moyen d'un bain de décapage auquel on ajoute un inhibiteur sous la forme de composés d'alcanolamine ou de sels contenant ces derniers (triéthanolamine par exemple). Ces composés empêchent de manière avantageuse la formation de nouveaux composés d'oxyde de chrome pendant le décapage des aubes de turbine et permettent d'éliminer efficacement les composés d'oxyde de chrome se trouvant dans le revêtement de sorte que les composés d'oxyde de chrome n'aient pas d'influence négative sur le taux d'élimination du procédé de décapage. Il est ainsi possible de raccourcir de manière avantageuse les temps de traitement pour le processus de décapage. En ajoutant 2 % de triéthanolamine (TEA), on peut réduire le temps de traitement dans l'acide chlorhydrique par exemple à moins d'une heure.
EP05770315A 2004-06-30 2005-06-13 Procede pour enlever un revetement applique sur une piece Withdrawn EP1761660A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05770315A EP1761660A1 (fr) 2004-06-30 2005-06-13 Procede pour enlever un revetement applique sur une piece

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP04015424A EP1612299B1 (fr) 2004-06-30 2004-06-30 Procédé et appareil pour traitement de surface de matériaux de construction
DE200410053135 DE102004053135A1 (de) 2004-10-29 2004-10-29 Verfahren zum Abtragen einer Beschichtung von einem Bauteil
PCT/DE2005/001090 WO2006002610A1 (fr) 2004-06-30 2005-06-13 Procede pour enlever un revetement applique sur une piece
EP05770315A EP1761660A1 (fr) 2004-06-30 2005-06-13 Procede pour enlever un revetement applique sur une piece

Publications (1)

Publication Number Publication Date
EP1761660A1 true EP1761660A1 (fr) 2007-03-14

Family

ID=34972912

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05770315A Withdrawn EP1761660A1 (fr) 2004-06-30 2005-06-13 Procede pour enlever un revetement applique sur une piece

Country Status (3)

Country Link
US (1) US20080277288A1 (fr)
EP (1) EP1761660A1 (fr)
WO (1) WO2006002610A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1870497A1 (fr) * 2006-06-23 2007-12-26 Siemens Aktiengesellschaft Procédé d'enlèvement électrochimique d'un revêtement métallique d'un substrat
EP1890004A1 (fr) * 2006-08-08 2008-02-20 Siemens Aktiengesellschaft Procédé pour la production d'un revêtement à partir du matériau d'un revêtement recyclé
DE102006044416A1 (de) * 2006-09-18 2008-03-27 Siemens Ag Verfahren zum elektrochemischen Be- oder Entschichten von Bauteilen
DE102007049496A1 (de) * 2007-09-14 2009-03-19 Extrude Hone Gmbh Elektrolyt für die elektrochemische Bearbeitung
FR3004735B1 (fr) * 2013-04-23 2015-07-03 Dourdin Procede de vernissage de pieces metallisees
US9926517B2 (en) 2013-12-09 2018-03-27 General Electric Company Cleaning solution and methods of cleaning a turbine engine
US20150159122A1 (en) * 2013-12-09 2015-06-11 General Electric Company Cleaning solution and methods of cleaning a turbine engine
BR102016021259B1 (pt) 2015-10-05 2022-06-14 General Electric Company Método e soluções de limpeza de um motor de turbina e composição de reagente
CN113106532B (zh) * 2021-04-07 2023-04-11 江苏源清动力技术有限公司 一种航空发动机和燃气轮机热部件热障涂层去除工艺

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600527A1 (fr) * 2004-05-27 2005-11-30 General Electric Company Élimination chimique de couches d'oxyde sur des objets en superalliage

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2254398A1 (de) * 1972-11-07 1974-05-16 Dillenberg Bergische Metall Bad zum elektrolytischen abloesen von metallueberzuegen
US4233124A (en) * 1979-10-29 1980-11-11 Oxy Metal Industries Corporation Electrolytic stripping bath and process
DE3420702A1 (de) * 1984-06-02 1985-12-05 Dico Gesellschaft für Galvanotechnik mbH & Co KG, 4020 Mettmann Bad zum elektrolytischen abziehen von metallueberzuegen auf aluminium und magnesium
JPH02285081A (ja) * 1989-04-25 1990-11-22 Sanyo Chem Ind Ltd エッチング液
US6165345A (en) * 1999-01-14 2000-12-26 Chromalloy Gas Turbine Corporation Electrochemical stripping of turbine blades
US6352636B1 (en) * 1999-10-18 2002-03-05 General Electric Company Electrochemical system and process for stripping metallic coatings
US6454870B1 (en) 2001-11-26 2002-09-24 General Electric Co. Chemical removal of a chromium oxide coating from an article

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1600527A1 (fr) * 2004-05-27 2005-11-30 General Electric Company Élimination chimique de couches d'oxyde sur des objets en superalliage

Also Published As

Publication number Publication date
US20080277288A1 (en) 2008-11-13
WO2006002610A1 (fr) 2006-01-12

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