GB966863A - Improvements in or relating to coatings on ferrous articles - Google Patents

Improvements in or relating to coatings on ferrous articles

Info

Publication number
GB966863A
GB966863A GB4310660A GB4310660A GB966863A GB 966863 A GB966863 A GB 966863A GB 4310660 A GB4310660 A GB 4310660A GB 4310660 A GB4310660 A GB 4310660A GB 966863 A GB966863 A GB 966863A
Authority
GB
United Kingdom
Prior art keywords
ferrous
coating
metal
molten
iia
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
GB4310660A
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and 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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Publication of GB966863A publication Critical patent/GB966863A/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
    • C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
    • C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
    • C23C10/20—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions only one element being diffused
    • C23C10/22—Metal melt containing the element to be diffused

Landscapes

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

Abstract

In a process of forming a diffusion coated ferrous article in which the diffusion coating is ferritic and contains at least 20% Cr and at least 1% Ni or is austenitic and has a Cr content above 12% and a combined Cr and Ni content above 30%, the ferrous base is contacted with a molten composition containing Ni and Cr and a metal of Group IIa of the Periodic Table which has a melting point not above 900 DEG C. The preferred Group IIa metal is calcium although barium, strontium and magnesium may be used. A fluoride or chloride of a metal of Group Ia or IIa may also be added and the preferred temperature of the treatment is 900-1300 DEG C. The coating is formed by immersing the ferrous base in a molten bath of calcium and powdered Ni and Cr or Ni and Fe/Cr. A molten Ca/Zn transfer agent may also be used and in a further embodiment the coating is formed from a powder mixture of Ca, Ni and Cr which is sandwiched between ferrous bases and the assembly is then heated to 900-1300 DEG C. The process is effected in an inert atmosphere and many examples of different bath compositions are given. Specification 964,323 is referred to.
GB4310660A 1959-12-15 1960-12-14 Improvements in or relating to coatings on ferrous articles Expired GB966863A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US85971459A 1959-12-15 1959-12-15
US85971359A 1959-12-15 1959-12-15

Publications (1)

Publication Number Publication Date
GB966863A true GB966863A (en) 1964-08-19

Family

ID=27127535

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4310660A Expired GB966863A (en) 1959-12-15 1960-12-14 Improvements in or relating to coatings on ferrous articles

Country Status (2)

Country Link
DE (1) DE1446222A1 (en)
GB (1) GB966863A (en)

Also Published As

Publication number Publication date
DE1446222A1 (en) 1969-10-23

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