GB475828A - Improvements in and relating to methods of increasing the resistance to heat of alloys containing iron and aluminium with or without chromium - Google Patents

Improvements in and relating to methods of increasing the resistance to heat of alloys containing iron and aluminium with or without chromium

Info

Publication number
GB475828A
GB475828A GB22652/36A GB2265236A GB475828A GB 475828 A GB475828 A GB 475828A GB 22652/36 A GB22652/36 A GB 22652/36A GB 2265236 A GB2265236 A GB 2265236A GB 475828 A GB475828 A GB 475828A
Authority
GB
United Kingdom
Prior art keywords
aluminium
chromium
resistance
heat
solution
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
GB22652/36A
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.)
Vacuumschmelze GmbH and Co KG
Original Assignee
Heraeus Vacuumschmelze 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
Application filed by Heraeus Vacuumschmelze AG filed Critical Heraeus Vacuumschmelze AG
Publication of GB475828A publication Critical patent/GB475828A/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
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/73—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process
    • C23C22/74—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals characterised by the process for obtaining burned-in conversion coatings

Landscapes

  • Chemical & Material Sciences (AREA)
  • General 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

Iron-aluminium or iron-aluminium-chromium alloys containing for example 2-12 per cent of aluminium with or without up to 35 per cent of chromium, which are characterized by their resistance to heat up to temperatures of about 1300 DEG C., are treated with alkaline solutions to prevent the phenomenon of blistering at high temperatures. The alloys may be immersed for from a few hours up to several days in a sodium carbonate solution, lime water, baryta water, or caustic soda solution. If a skin forms on the surface of the solution it should be skimmed off before the alloys are removed. After removal from the solution the residues of the alkaline constituents may be burnt in by heating to a temperature of about 400-600 DEG C. or the burning in may be effected when the article is put into use, e.g. as an electrical heating element.
GB22652/36A 1935-09-24 1936-08-17 Improvements in and relating to methods of increasing the resistance to heat of alloys containing iron and aluminium with or without chromium Expired GB475828A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE475828X 1935-09-24

Publications (1)

Publication Number Publication Date
GB475828A true GB475828A (en) 1937-11-26

Family

ID=6541909

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22652/36A Expired GB475828A (en) 1935-09-24 1936-08-17 Improvements in and relating to methods of increasing the resistance to heat of alloys containing iron and aluminium with or without chromium

Country Status (1)

Country Link
GB (1) GB475828A (en)

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