EP0055272B1 - Revetement composite electro-depose et procede de formation de celui-ci - Google Patents

Revetement composite electro-depose et procede de formation de celui-ci Download PDF

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Publication number
EP0055272B1
EP0055272B1 EP81901799A EP81901799A EP0055272B1 EP 0055272 B1 EP0055272 B1 EP 0055272B1 EP 81901799 A EP81901799 A EP 81901799A EP 81901799 A EP81901799 A EP 81901799A EP 0055272 B1 EP0055272 B1 EP 0055272B1
Authority
EP
European Patent Office
Prior art keywords
particles
coating
aluminium
oxide
chromium
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
EP81901799A
Other languages
German (de)
English (en)
Other versions
EP0055272A1 (fr
Inventor
Eric Charles Kedward
Colin Anthony Addison
Francis John Honey
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.)
Praxair ST Technology Inc
Original Assignee
Baj Ltd
Baj Vickers Ltd
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
Application filed by Baj Ltd, Baj Vickers Ltd filed Critical Baj Ltd
Publication of EP0055272A1 publication Critical patent/EP0055272A1/fr
Application granted granted Critical
Publication of EP0055272B1 publication Critical patent/EP0055272B1/fr
Expired legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C25ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25DPROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D15/00Electrolytic or electrophoretic production of coatings containing embedded materials, e.g. particles, whiskers, wires
    • C25D15/02Combined electrolytic and electrophoretic processes with charged materials

Definitions

  • the present invention relates to a composite electrodeposited coating comprising a metal matrix electrodeposited from a plating bath, the matrix incorporating particles deposited simultaneously from the bath in which the particles are substantially insoluble.
  • US 3057048 (Hirakis) describes a method of protecting niobium in a high temperature oxidising environment by electro-depositing a coating comprising a matrix of iron chromium nickel or cobalt incorporating various solid particles for example alumina, thoria, silicon, aluminium, chromium and boron.
  • the coating is found to have a particulate content of from 5 to 20% by volume.
  • a composite electrodeposited coating is characterised in that the particles comprise a combination of particles of or containing chromium, particles of or containing aluminium and particles of an oxide of a rare earth metal and/or an oxide of zirconium, titanium or hafnium.
  • the particles other than the oxide particles may comprise pure chromium powder and pure aluminium powder, or an alloy of chromium and aluminium in powder form, or an alloy of chromium and aluminium in powder form mixed with either both or one of pure aluminium or chromium, or one further possibility is to have a small quantity of a rare earth metal or a Group IV metal alloyed with either chromium or aluminium or both.
  • the metal matrix comprises nickel or cobalt and the coating may be used to coat any suitable substrate for example steel, high temperature creep-resistant nickel alloys, nonferrous and light alloys and non-metallic substances with an outer conductive layer.
  • the oxide present in the coating preferably comprises "lime-stabilized" zirconia.
  • the oxide may constitute from 0.01 to 5% of the coating, preferably about 2% by weight, and may be present in the size range up to 10 pm.
  • the chromium present in the coating may comprise up to 40% by weight of the coating, preferably comprising 10 to 20%, for example 15%.
  • the aluminium present in the coating may comprise up to 25% by weight of the coating and preferably comprises 10 to 20%.
  • the particles may be up to 10 pm in diameter and preferably fall largely within the range of 1 to 2 um.
  • a method of forming a composite coating is characterised in that the particles comprise a combination of particles of or containing chromium, particles of or containing aluminium, and particles of an oxide of a rare earth metal and/or an oxide of zirconium, titanium or hafnium.
  • the coating may be further heat treated, either in use or for example by being held at 1000°C for 4 hours.
  • a metal atom diffuses outwards through the oxide it may leave behind a vacancy.
  • the vacancies would normally coalesce at the interface between the metal and oxide to form voids such that the oxide would only be attached to the parent metal at a few places.
  • the oxide formed might have a greater volume than the original metal from which it has been formed and so a compressive stress would develop in the growing oxide layer. This might give rise to a complicated stress situation at the oxide-metal interface which is believed to consist mainly of shear stresses and also transverse stress acting to pull the oxide away from the metal. The net result of these stresses coupled with the lack of coherency at the interface would be that the oxide would spall off and expose fresh metal to the hot gas. This process would repeat itself and so the metal would be progressively lost.
  • a problem which may arise if oxide spallation does not occur is that the oxide simply gets thicker as time goes on and the component gets weaker as the cross section of the metal decreases.
  • One method by which these problems may be overcome is to reduce simultaneously the rates at which the oxygen and metal diffuse through the oxide and to provide a means by which the vacancies may be annihilated and so prevent void formation. It is in this way that the inclusion of the oxide particles, which are both thermodynamically stable and chemically stable in an oxidising atmosphere, may greatly improve the adhesion of the aluminium oxide to the matrix metal at the surface of the coating. It is believed that the effect is achieved in three ways, either singly or in combination.
  • the first of these is the “stress relief” mechanism in which the presence of oxide particles at the coating's surface provides “dead spots” over which the developing oxide film can grow laterally thereby relieving any stresses in the film.
  • the second is the “vacancy sink” mechanism in which the vacancies left by aluminium atoms diffusing to the surface to react with oxygen are at least partially filled by oxide molecules so that the oxide particles undergo a rearrangement to occupy the voids which effectively "diffuse” through the matrix.
  • the third is simply a reduction in the diffusion coefficients through the growing surface oxide layer of either the metal ions or the oxygen atoms or both.
  • a method of forming a composite coating is characterised in that the particles comprise a combination of particles of or containing chromium and particles of an oxide of a rear earth metal and/or oxide of zirconium titanium or hafnium, and by subsequently aluminising the coating.
  • the particles also include an aluminium-containing substance and, preferably, the aluminising step comprises a pack-aluminising process.
  • the material used may be aluminium powder, or a mixture of aluminium and aluminium oxide.
  • the aluminium is in the form of an alloy with chromium.
  • the pack-aluminising is carried out at a high temperature.
  • the aluminium is believed to diffuse into the surface of the electrodeposited coating and thus form a bond.
  • the coating may be subsequently heat treated, for example by being held at 1000°C for about 4 hours, or may be heat treated in use.
  • the coating process may involve an electrolytic or an electroless method and may be carried out using the apparatus and operating conditions described in the Applicants' British Patents Nos. 1 218 179, 1 224 166, 1 329 081 and 1 347 184.
  • the panel to be coated was given a pretreatment comprising immersion in a cyanide cleaner for two minutes followed by a water rinse etching by immersion for 30 seconds in a 50% sulphuric acid followed by a water rinse, and a nickel strike by plating in a nickel bath for three minutes at a current density of 3.9 amps per square decimetre.
  • the panel was secured in a plating barrel and connected to a cathode contact. 40 grams per litre of barrel capacity of lime-stabilised zirconia powder and 600 grams per litre of barrel capacity of chromium/aluminium alloy powder, both with a mean particle size of to 5 pm, were added to the barrel and the opening in the barrel through which the panel to be coated and the powder were admitted was closed.
  • the barrel was then completely submerged in the solution in the tank and was rotated at three revolutions per minute while composite plating took place at a voltage of between 2.5 and 3 volts with a current density of approximately 2.7 amps per square decimetre.
  • the solution temperature was maintained at 50°C and the solution had a pH of between 4.5 and 5.
  • plating was stopped.
  • the panel was then held at 1000°C for 4 hours, cooled and examined. It was found that the panel had been given a tenacious coating having an even distribution of particles.
  • the coating had a particle content of approximately 2% by volume of zirconia and 30% by volume of chromium/ aluminium alloy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Chemically Coating (AREA)

Claims (21)

1. Un revêtement composite déposé électrolytiquement comprenant une matrice métallique déposée électrolytiquement à partir d'un bain de plaquage, la matrice comportant des particules déposées simultanément à partir du bain dans lequel les particules sont sensiblement insolubles, caractérisé en ce que les particules comprennent une combinaison de particules de ou contenant du chrome, de particules de ou contenant de l'aluminium et de particules d'un oxyde d'un métal de terre rare et/ou d'un oxyde de zirconium, de titane ou d'hafnium.
2. Un revêtement tel que revendiqué dans la revendication 1, caractérisé en ce que le métal de matrice est du nickel ou du cobalt.
3. Un revêtement tel que revendiqué dans la revendication 1 ou la revendication 2, caractérisé en ce que l'oxyde est de l'oxyde de zirconium "stabilisé à la chaux".
4. Un revêtement tel que revendiqué dans une quelconque des revendications précédentes, caractérisé en ce que les particules comprennent en outre des particules d'oxyde d'aluminium.
5. Un revêtement tel que revendiqué dans une quelconque des revendications précédentes, caractérisé en ce que les particules ont un diamètre jusqu'à 10 microns.
6. Un revêtement tel que revendiqué dans une quelconque des revendications précédentes, caractérisé en ce que l'aluminium présent forme jusqu'à 25% en poids du revêtement.
7. Un revêtement tel que revendiqué dans une quelconque des revendications précédentes, caractérisé en ce que le chrome présent forme jusqu'à 40% en poids du revêtement.
8. Un revêtement tel que revendiqué dans une quelconque des revendications précédentes, caractérisé en ce que les particules d'aluminium comprennent de la poudre d'aluminium pur.
9. Un revêtement tel que revendiqué dans une quelconque des revendications 'précédentes, caractérisé en ce que les particules de chrome comprennent de la poudre de chrome pur.
10. Un revêtement tel que revendiqué dans une quelconque des revendications 1 à 6, caractérisé en ce que les particules contenant du chrome et les particules contenant de l'aluminium comprennent un alliage d'aluminium et de chrome sous forme de poudre.
11. Un procédé de formation d'un revêtement composité, consistant à déposer électrolytiquement une matrice métallique à partir d'un bain de plaquage et à déposer simultanément des particules qui sont sensiblement insolubles dans le bain de plaquage, caractérisé en ce que les particules comprennent une combinaison de particules de ou contenant du chrome, de particules de ou contenant de l'aluminium et de particules d'un oxyde d'un métal de terre rare et/ou d'un oxyde de zirconium, de titane ou d'hafnium.
12. Un procédé de formation d'un revêtement composite, consistant à déposer électrolytiquement une matrice métallique à partir d'un bain de plaquage et à déposer simultanément des particules qui sont sensiblement insolubles dans le bain de plaquage, caractérisé en ce que les particules comprennent une combinaison de particules de ou contenant particules d'un oxyde d'un métal de terre rare et/ou d'un oxyde de zirconium, de titane ou d'hafnium, et à aluminiser ultérieurement le revêtement.
13. Un procédé tel que revendiqué dans la revendication 12, caractérisé en ce que les particules comprennent en outre une substance contenant de l'aluminium.
14. Un procédé tel que revendiqué dans la revendication 12, caractérisé en ce que le revêtement est aluminisé.
15. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 14, caractérisé en ce que le métal de matrice est du nickel ou du cobalt.
16. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 15, caractérisé en ce que l'oxyde est de l'oxyde de zirconium "stabilisé à la chaux".
17. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 16, caractérisé en ce ce que les particules comprennent en outre des particules d'oxyde d'aluminium.
18. Un procédé tel que revendique dans une quelconque des revendications 11 à 17, caractérisé en ce que les particules ont un diamètre jusqu'à 10 microns.
19. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 18, caractérisé en ce que la substance contenant de l'aluminium comprend une poudre d'aluminium pur.
20. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 19, caractérisé en ce que les particules de chrome comprennent de la poudre de chrome pur.
21. Un procédé tel que revendiqué dans une quelconque des revendications 11 à 18, caractérisé en ce que les particules contenant du chrome et les particules contenant de l'aluminium comprennent un alliage d'aluminium et de chrome sous forme de poudre.
EP81901799A 1980-07-02 1981-07-02 Revetement composite electro-depose et procede de formation de celui-ci Expired EP0055272B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8021614A GB2083076B (en) 1980-07-02 1980-07-02 Composite electrodeposited coating and a method of forming such a coating
GB8021614 1980-07-02

Publications (2)

Publication Number Publication Date
EP0055272A1 EP0055272A1 (fr) 1982-07-07
EP0055272B1 true EP0055272B1 (fr) 1985-11-27

Family

ID=10514464

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81901799A Expired EP0055272B1 (fr) 1980-07-02 1981-07-02 Revetement composite electro-depose et procede de formation de celui-ci

Country Status (7)

Country Link
EP (1) EP0055272B1 (fr)
JP (2) JPS643960B2 (fr)
BE (1) BE889491A (fr)
CA (1) CA1176596A (fr)
GB (1) GB2083076B (fr)
IT (1) IT1171356B (fr)
WO (1) WO1982000162A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10251902A1 (de) * 2002-11-07 2004-06-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Beschichten eines Substrats und beschichteter Gegenstand

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3535548C2 (de) * 1984-10-05 1999-03-04 Baj Coatings Ltd Beschichteter Gegenstand und Verfahren zum Herstellen einer Beschichtung eines Gegenstandes
GB2167446B (en) * 1984-10-05 1988-05-05 Baj Ltd Electrode deposited composite coating
FR2615871B1 (fr) * 1987-05-26 1989-06-30 Snecma Pieces de turbomachine en superalliage comportant un revetement protecteur metalloceramique
DE102013218687A1 (de) * 2013-09-18 2015-04-02 MTU Aero Engines AG Galvanisch hergestellte Verschleißschutzbeschichtung und Verfahren hierfür

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3057048A (en) * 1958-11-06 1962-10-09 Horizons Inc Protection of niobium
JPS5278718A (en) * 1975-12-26 1977-07-02 Seiko Instr & Electronics Component parts
JPS5929119B2 (ja) * 1976-10-12 1984-07-18 スズキ株式会社 多層複合メツキ層
CH599352A5 (fr) * 1976-10-15 1978-05-31 Bbc Brown Boveri & Cie

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10251902A1 (de) * 2002-11-07 2004-06-03 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Beschichten eines Substrats und beschichteter Gegenstand
DE10251902B4 (de) * 2002-11-07 2009-05-07 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zum Beschichten eines Substrats und beschichteter Gegenstand

Also Published As

Publication number Publication date
BE889491A (fr) 1982-01-04
GB2083076B (en) 1984-06-13
JPH01212800A (ja) 1989-08-25
JPH0260760B2 (fr) 1990-12-18
JPS57500882A (fr) 1982-05-20
CA1176596A (fr) 1984-10-23
WO1982000162A1 (fr) 1982-01-21
JPS643960B2 (fr) 1989-01-24
IT8148809A0 (it) 1981-07-02
IT1171356B (it) 1987-06-10
GB2083076A (en) 1982-03-17
EP0055272A1 (fr) 1982-07-07

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