JPS5638478A - Blackening treatment of sheath heater protective pipe - Google Patents

Blackening treatment of sheath heater protective pipe

Info

Publication number
JPS5638478A
JPS5638478A JP11383979A JP11383979A JPS5638478A JP S5638478 A JPS5638478 A JP S5638478A JP 11383979 A JP11383979 A JP 11383979A JP 11383979 A JP11383979 A JP 11383979A JP S5638478 A JPS5638478 A JP S5638478A
Authority
JP
Japan
Prior art keywords
sheath heater
protective pipe
blackening treatment
heater protective
dew point
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
JP11383979A
Other languages
Japanese (ja)
Other versions
JPS599626B2 (en
Inventor
Daiji Sakamoto
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP11383979A priority Critical patent/JPS599626B2/en
Publication of JPS5638478A publication Critical patent/JPS5638478A/en
Publication of JPS599626B2 publication Critical patent/JPS599626B2/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Resistance Heating (AREA)

Abstract

PURPOSE:To form a dense black coating with good protectivity by heating the sheath heater to predetermined temp. in a wet hydrogen atmosphere with a predetermined dew point or more. CONSTITUTION:The sheath heater having an alloy pipe containing 5wt% or more of Cr as a protective pipe is heated to 900-1,200 deg.C in a wet hydrogen atmosphere with a dew point of 5 deg.C or more and, according to circumstances, heated further at 900-1,200 deg.C in the air to form an oxide coating based on Cr with a thickness of 0.5-6mu. Thereby, dense Cr2O3 is formed and a black coating with excellent corrosion resistance and oxidation resistance is obtained.
JP11383979A 1979-09-05 1979-09-05 Blackening treatment method for sheathed heater protection tube Expired JPS599626B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11383979A JPS599626B2 (en) 1979-09-05 1979-09-05 Blackening treatment method for sheathed heater protection tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11383979A JPS599626B2 (en) 1979-09-05 1979-09-05 Blackening treatment method for sheathed heater protection tube

Publications (2)

Publication Number Publication Date
JPS5638478A true JPS5638478A (en) 1981-04-13
JPS599626B2 JPS599626B2 (en) 1984-03-03

Family

ID=14622335

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11383979A Expired JPS599626B2 (en) 1979-09-05 1979-09-05 Blackening treatment method for sheathed heater protection tube

Country Status (1)

Country Link
JP (1) JPS599626B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6151790A (en) * 1984-08-20 1986-03-14 松下電器産業株式会社 Far infrared ray heater
FR2822851A1 (en) * 2001-03-30 2002-10-04 Bacock & Wilcox Canada Ltd Formation of a chromium rich layer on the surface of a nickel based alloy component containing chromium by heating to chromium oxidising temperature and exposing it to a controlled oxidising gas mixture

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6151790A (en) * 1984-08-20 1986-03-14 松下電器産業株式会社 Far infrared ray heater
FR2822851A1 (en) * 2001-03-30 2002-10-04 Bacock & Wilcox Canada Ltd Formation of a chromium rich layer on the surface of a nickel based alloy component containing chromium by heating to chromium oxidising temperature and exposing it to a controlled oxidising gas mixture

Also Published As

Publication number Publication date
JPS599626B2 (en) 1984-03-03

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