FR2271307A1 - Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation - Google Patents

Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation

Info

Publication number
FR2271307A1
FR2271307A1 FR7417195A FR7417195A FR2271307A1 FR 2271307 A1 FR2271307 A1 FR 2271307A1 FR 7417195 A FR7417195 A FR 7417195A FR 7417195 A FR7417195 A FR 7417195A FR 2271307 A1 FR2271307 A1 FR 2271307A1
Authority
FR
France
Prior art keywords
cyanate
fused
stabilising
heat treatment
cpds
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
FR7417195A
Other languages
French (fr)
Other versions
FR2271307B1 (en
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.)
Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
Original Assignee
Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
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 Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA filed Critical Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
Priority to FR7417195A priority Critical patent/FR2271307A1/en
Priority to ES437450A priority patent/ES437450A1/en
Priority to ZA00753053A priority patent/ZA753053B/en
Priority to CH606275A priority patent/CH606476A5/xx
Priority to US05/576,993 priority patent/US4006043A/en
Priority to NLAANVRAGE7505638,A priority patent/NL178981C/en
Priority to CA226,907A priority patent/CA1049908A/en
Priority to BE156356A priority patent/BE829078A/en
Priority to SE7505532A priority patent/SE429448B/en
Priority to BR3858/75A priority patent/BR7503026A/en
Priority to AR258809A priority patent/AR202685A1/en
Priority to JP50057546A priority patent/JPS596911B2/en
Priority to DE2521903A priority patent/DE2521903C2/en
Priority to GB20918/75A priority patent/GB1504917A/en
Priority to IT68273/75A priority patent/IT1032913B/en
Priority to SU752133389A priority patent/SU793410A3/en
Priority to DD186101A priority patent/DD118445A5/xx
Publication of FR2271307A1 publication Critical patent/FR2271307A1/en
Application granted granted Critical
Publication of FR2271307B1 publication Critical patent/FR2271307B1/fr
Granted 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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/42—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 liquids, e.g. salt baths, liquid suspensions only one element being applied
    • C23C8/48—Nitriding
    • C23C8/50—Nitriding of ferrous surfaces
    • 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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/52—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in one step
    • 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
    • C23C8/40—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 liquids, e.g. salt baths, liquid suspensions
    • C23C8/58—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 liquids, e.g. salt baths, liquid suspensions more than one element being applied in more than one step

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
  • Removal Of Specific Substances (AREA)

Abstract

The cyanide content of fused salt baths, contg. cyanate anion CNO-, is kept at a low value by addn. to the bath of S cpds., giving 0.001-0.1 wt. % S, and org. cpds. contg. carbonyl radicals. The formation of cyanide is suppressed to 0.05% and the cyanate ion can be maintained close to the level of concn. of the freshly made bath.
FR7417195A 1974-05-17 1974-05-17 Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation Granted FR2271307A1 (en)

Priority Applications (17)

Application Number Priority Date Filing Date Title
FR7417195A FR2271307A1 (en) 1974-05-17 1974-05-17 Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation
ES437450A ES437450A1 (en) 1974-05-17 1975-05-05 Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
ZA00753053A ZA753053B (en) 1974-05-17 1975-05-12 A method of maintaining at very low values the content of cyanide in salt baths containing cyanates
CH606275A CH606476A5 (en) 1974-05-17 1975-05-12
US05/576,993 US4006043A (en) 1974-05-17 1975-05-13 Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
SE7505532A SE429448B (en) 1974-05-17 1975-05-14 SET IN SALT BATH-CONTAINING CYANATES HALLA CYANIDE CONTENT AT VERY LOW WORLD.
CA226,907A CA1049908A (en) 1974-05-17 1975-05-14 Method of maintaining low values of cyanide in cyanate salt baths
BE156356A BE829078A (en) 1974-05-17 1975-05-14 PROCEDURE FOR KEEPING THE CYANIDE LEVEL AT VERY LOW VALUES IN SALT BATHS CONTAINING CYANATES
NLAANVRAGE7505638,A NL178981C (en) 1974-05-17 1975-05-14 METHOD OF KEEPING THE CYANIDE CONTENT IN MOLTED SALT BATHS, CONTAINING CYANATE STATES AS AN ACTIVE SUBSTANCE
BR3858/75A BR7503026A (en) 1974-05-17 1975-05-15 PROCESS TO MAINTAIN VERY LOW VALUES, THE RATE OF CYANURETS IN THE FUSED SALTS BATHS
JP50057546A JPS596911B2 (en) 1974-05-17 1975-05-16 cyanian beetles
DE2521903A DE2521903C2 (en) 1974-05-17 1975-05-16 Process for keeping the cyanide content low in molten salt baths with cyanate anions as the active ingredient
GB20918/75A GB1504917A (en) 1974-05-17 1975-05-16 Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
IT68273/75A IT1032913B (en) 1974-05-17 1975-05-16 PROCEDURE FOR KEEPING THE RATE OF CYANIDE AT VERY LOW VALUES IN THE BATHROOMS OF SALT CONTAINING CYANATES
AR258809A AR202685A1 (en) 1974-05-17 1975-05-16 PROCEDURE TO KEEP THE PROPORTION OF CYANIDE IN SALT BANKS CONTAINING CYANATES AT VERY LOW VALUES
SU752133389A SU793410A3 (en) 1974-05-17 1975-05-16 Method of regenerating salt melts for nitriding
DD186101A DD118445A5 (en) 1974-05-17 1975-05-16

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7417195A FR2271307A1 (en) 1974-05-17 1974-05-17 Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation

Publications (2)

Publication Number Publication Date
FR2271307A1 true FR2271307A1 (en) 1975-12-12
FR2271307B1 FR2271307B1 (en) 1978-11-17

Family

ID=9138999

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7417195A Granted FR2271307A1 (en) 1974-05-17 1974-05-17 Stabilising fused cyanate heat treatment baths - by introducing sulphur and carbonyl cpds. to reduce cyanide formation

Country Status (3)

Country Link
BE (1) BE829078A (en)
FR (1) FR2271307A1 (en)
ZA (1) ZA753053B (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145576A2 (en) * 1983-12-09 1985-06-19 CENTRE STEPHANOIS DE RECHERCHES MECANIQUES HYDROMECANIQUE ET FROTTEMENT Société dite: Additive for maintaining the working order of molten-salt baths for the treatment of metal pieces
US5468071A (en) * 1992-07-10 1995-11-21 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Bearing shell for heavily loaded bearings with a rolled strip interference or force fit lining
US5514226A (en) * 1994-02-09 1996-05-07 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Salt bath composition based on alkali nitrates for oxidizing ferrous metal to improve its corrosion resistance
US5518605A (en) * 1993-08-06 1996-05-21 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of nitriding ferrous metal parts having improved corrosion resistance
US5576066A (en) * 1993-08-10 1996-11-19 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of improving the wear and corrosion resistance of ferrous metal parts

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0145576A2 (en) * 1983-12-09 1985-06-19 CENTRE STEPHANOIS DE RECHERCHES MECANIQUES HYDROMECANIQUE ET FROTTEMENT Société dite: Additive for maintaining the working order of molten-salt baths for the treatment of metal pieces
EP0145576A3 (en) * 1983-12-09 1985-07-10 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Societe Dite: Additive for maintaining the working order of molten-salt baths for the treatment of metal pieces
US5468071A (en) * 1992-07-10 1995-11-21 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Bearing shell for heavily loaded bearings with a rolled strip interference or force fit lining
US5518605A (en) * 1993-08-06 1996-05-21 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of nitriding ferrous metal parts having improved corrosion resistance
US5576066A (en) * 1993-08-10 1996-11-19 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of improving the wear and corrosion resistance of ferrous metal parts
US5514226A (en) * 1994-02-09 1996-05-07 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Salt bath composition based on alkali nitrates for oxidizing ferrous metal to improve its corrosion resistance

Also Published As

Publication number Publication date
ZA753053B (en) 1976-04-28
FR2271307B1 (en) 1978-11-17
BE829078A (en) 1975-09-01

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