GB410400A - An improved process for hardening corrosion-resisting iron and steel alloys by nitrogenisation - Google Patents

An improved process for hardening corrosion-resisting iron and steel alloys by nitrogenisation

Info

Publication number
GB410400A
GB410400A GB28043/33A GB2804333A GB410400A GB 410400 A GB410400 A GB 410400A GB 28043/33 A GB28043/33 A GB 28043/33A GB 2804333 A GB2804333 A GB 2804333A GB 410400 A GB410400 A GB 410400A
Authority
GB
United Kingdom
Prior art keywords
alloys
nitrogenisation
steel alloys
improved process
acid
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
GB28043/33A
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.)
NITRALLOY Ltd
Original Assignee
NITRALLOY 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 NITRALLOY Ltd filed Critical NITRALLOY Ltd
Publication of GB410400A publication Critical patent/GB410400A/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
    • C23C8/02—Pretreatment of the material to be coated

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Treatment Of Metals (AREA)

Abstract

The passive film on rustless chromium or nickel-chromium iron or steel alloys is removed, before nitrogenizing by treating the alloys with an acid which is capable of removing the film without attacking the alloys, such as phosphoric acid or a salt of such acid such as a phosphate. A phosphoric acid solution of zinc phosphate may be used or the salt in powder form may be sprinkled over the alloys. Boric acid may be used instead of phosphoric acid and cadmium, bismuth or cobalt phosphates instead of zinc phosphate. Specification 174,580, [Class 72], is referred to.
GB28043/33A 1932-12-06 1933-10-11 An improved process for hardening corrosion-resisting iron and steel alloys by nitrogenisation Expired GB410400A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE410400X 1932-12-06

Publications (1)

Publication Number Publication Date
GB410400A true GB410400A (en) 1934-05-17

Family

ID=6424745

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28043/33A Expired GB410400A (en) 1932-12-06 1933-10-11 An improved process for hardening corrosion-resisting iron and steel alloys by nitrogenisation

Country Status (1)

Country Link
GB (1) GB410400A (en)

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