GB831786A - Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures - Google Patents

Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures

Info

Publication number
GB831786A
GB831786A GB1643156A GB1643156A GB831786A GB 831786 A GB831786 A GB 831786A GB 1643156 A GB1643156 A GB 1643156A GB 1643156 A GB1643156 A GB 1643156A GB 831786 A GB831786 A GB 831786A
Authority
GB
United Kingdom
Prior art keywords
nickel
slow
electroplated
heat treatment
reducing atmosphere
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
GB1643156A
Inventor
George Francis Albers
Frederick Snelling Schultz
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to GB1643156A priority Critical patent/GB831786A/en
Publication of GB831786A publication Critical patent/GB831786A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated
    • C25D5/38—Pretreatment of metallic surfaces to be electroplated of refractory metals or nickel
    • 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
    • C25D5/48—After-treatment of electroplated surfaces
    • C25D5/50—After-treatment of electroplated surfaces by heat-treatment

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

831,786. Gas-turbine blades. GENERAL ELECTRIC CO. May 28, 1956, No. 16431/56. Class 110 (3). [Also in Group XXXVI] A molybdenum or molybdenum base alloy gas-turbine blade is successively electroplated with chromium, e.g. from a chromic acidsulphuric acid bath, given an electrolytic nickel strike coating of at least 0.5 mil. thickness from a high chloride bath, electroplated with low-stress nickel, e.g. from a weak nickel chloride bath, subjected to a slow heat treatment cycle in a reducing atmosphere in which the temperature is raised to at least 1600‹ F., electroplated with a second layer of chromium, and subjected to a second slow-heat treatment cycle in a reducing atmosphere in which the temperature is raised to at least 1800‹ F. Preferably the total thickness of nickel deposited is from 2 to 4 mils., the reducing atmosphere is dry hydrogen, and after the first slow-heat treatment the nickel surface is reactivated by dipping in dilute hydrochloric acid. The heat treatments are such as to effect bonding by diffusion.
GB1643156A 1956-05-28 1956-05-28 Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures Expired GB831786A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1643156A GB831786A (en) 1956-05-28 1956-05-28 Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1643156A GB831786A (en) 1956-05-28 1956-05-28 Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures

Publications (1)

Publication Number Publication Date
GB831786A true GB831786A (en) 1960-03-30

Family

ID=10077200

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1643156A Expired GB831786A (en) 1956-05-28 1956-05-28 Method of coating molybdenum and its alloys for protection against oxidation at elevated temperatures

Country Status (1)

Country Link
GB (1) GB831786A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434087B1 (en) * 1970-10-20 1979-10-24
DE102007016411A1 (en) 2007-04-02 2008-10-09 Gfe Fremat Gmbh Semi-finished refractory metal product for producing ingot has protective layer giving protection against oxidation during hot deformation of semi-finished product
DE102008036070A1 (en) * 2008-08-04 2010-05-27 H.C. Starck Gmbh moldings

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5434087B1 (en) * 1970-10-20 1979-10-24
DE102007016411A1 (en) 2007-04-02 2008-10-09 Gfe Fremat Gmbh Semi-finished refractory metal product for producing ingot has protective layer giving protection against oxidation during hot deformation of semi-finished product
DE102008036070A1 (en) * 2008-08-04 2010-05-27 H.C. Starck Gmbh moldings

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