ES440319A1 - Process for nitriding iron and steel in a salt bath - Google Patents

Process for nitriding iron and steel in a salt bath

Info

Publication number
ES440319A1
ES440319A1 ES440319A ES440319A ES440319A1 ES 440319 A1 ES440319 A1 ES 440319A1 ES 440319 A ES440319 A ES 440319A ES 440319 A ES440319 A ES 440319A ES 440319 A1 ES440319 A1 ES 440319A1
Authority
ES
Spain
Prior art keywords
salt bath
cyanate
cyanide
weight
calculated
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
ES440319A
Other languages
Spanish (es)
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.)
DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTAL VORMAIS
Evonik Operations GmbH
Original Assignee
DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTAL VORMAIS
Degussa GmbH
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 DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTAL VORMAIS, Degussa GmbH filed Critical DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTAL VORMAIS
Publication of ES440319A1 publication Critical patent/ES440319A1/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
    • C23C8/40—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)

Abstract

The salt bath contains potassium cyanate and/or sodium cyanate and has air flowing through it. Based on the total weight, the salt bath contains 25-57% by weight of cyanate, calculated as cyanate ion and optionally up to 5% by weight of cyanide, calculated as cyanide ion. Regeneration of the salt bath is effected by adding at least one polymeric carbon/nitrogen compound without removing used salts. In general the salt bath additionally contains sodium carbonate and/or potassium carbonate and may also contain alkali metal chloride. The process is environmentally safe, since owing to the small amounts or absence of cyanide, no toxic effluents are produced. The salt melt has a low viscosity, so that drag-out losses can be kept low. Alloyed and non-alloyed steels of any carbon content and iron can be nitrided to form good nitrided layers.
ES440319A 1974-08-29 1975-08-19 Process for nitriding iron and steel in a salt bath Expired ES440319A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2441310A DE2441310C3 (en) 1974-08-29 1974-08-29 Process for nitriding iron and steel in salt baths

Publications (1)

Publication Number Publication Date
ES440319A1 true ES440319A1 (en) 1977-03-16

Family

ID=5924348

Family Applications (1)

Application Number Title Priority Date Filing Date
ES440319A Expired ES440319A1 (en) 1974-08-29 1975-08-19 Process for nitriding iron and steel in a salt bath

Country Status (14)

Country Link
JP (1) JPS5150241A (en)
AR (1) AR201799A1 (en)
AT (1) AT349046B (en)
BR (1) BR7505152A (en)
CA (1) CA1058064A (en)
CH (1) CH616455A5 (en)
DE (1) DE2441310C3 (en)
ES (1) ES440319A1 (en)
FR (1) FR2283243A1 (en)
GB (1) GB1507904A (en)
IN (1) IN145225B (en)
IT (1) IT1041591B (en)
SE (1) SE7509535L (en)
ZA (1) ZA755450B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1576143A (en) * 1977-07-20 1980-10-01 Brico Eng Sintered metal articles
BR8705165A (en) * 1987-09-14 1989-04-11 Alcoa Aluminio Do Nordeste S A PROCESS FOR THERMAL TREATMENT OF METALLIC ALLOYS
US4938452A (en) * 1988-12-10 1990-07-03 Aisan Kogyo Kabushiki Kaisha Air control device for internal combustion engine
DE4119820C1 (en) * 1991-06-15 1992-09-03 Goetz Dr. 5400 Koblenz De Baum Treatment of iron@ (alloys) on same support - comprises nitriding in molten alkali metal cyanate and quenching in hot aq. salt bath
DE4324740C1 (en) * 1993-07-23 1994-06-16 Degussa Prodn of salt mixture for hardening of steel parts - by pressing together potassium cyanate, potassium carbonate and sodium carbonate.
FR2972459B1 (en) 2011-03-11 2013-04-12 Hydromecanique & Frottement FOUNDED SALT BATHS FOR NITRIDING STEEL MECHANICAL PARTS, AND METHOD FOR IMPLEMENTING THE SAME

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU805954A3 (en) * 1973-03-05 1981-02-15 Дегусса (Фирма) Method of regenerating carbonate-containing salt melts for nitriding and/or carburization of metallic articles
FR2234380A1 (en) * 1973-06-20 1975-01-17 Stephanois Rech Mecanique Cent Regenerating cyanate-carbonate molten salt baths - by adding amide pretreated to liberate ammonia

Also Published As

Publication number Publication date
IN145225B (en) 1978-09-09
IT1041591B (en) 1980-01-10
CA1058064A (en) 1979-07-10
FR2283243A1 (en) 1976-03-26
JPS5150241A (en) 1976-05-01
DE2441310A1 (en) 1976-03-11
ZA755450B (en) 1976-07-28
AR201799A1 (en) 1975-04-15
CH616455A5 (en) 1980-03-31
BR7505152A (en) 1976-08-03
DE2441310C3 (en) 1978-05-18
AT349046B (en) 1979-03-12
ATA665875A (en) 1978-08-15
FR2283243B1 (en) 1978-04-07
GB1507904A (en) 1978-04-19
DE2441310B2 (en) 1977-09-22
SE7509535L (en) 1976-03-01

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