US3475291A - Method of electrolytically sulfiding ferrous parts in a thiocyanate bath - Google Patents

Method of electrolytically sulfiding ferrous parts in a thiocyanate bath Download PDF

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Publication number
US3475291A
US3475291A US582269A US3475291DA US3475291A US 3475291 A US3475291 A US 3475291A US 582269 A US582269 A US 582269A US 3475291D A US3475291D A US 3475291DA US 3475291 A US3475291 A US 3475291A
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United States
Prior art keywords
bath
sulfiding
electrolytically
treated
thiocyanate
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Expired - Lifetime
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US582269A
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English (en)
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Jacques Jean Caubet
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Individual
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D9/00—Electrolytic coating other than with metals
    • C25D9/04—Electrolytic coating other than with metals with inorganic materials
    • C25D9/06—Electrolytic coating other than with metals with inorganic materials by anodic processes

Definitions

  • the present application has for its object an improvement in this method.
  • This improvement is characterized in that the bath of molten salts in which the metal part is immersed and subjected to electrolysis, is a mixture of thio-cyanates, and more particularly a mixture of sodium thiocyanate and potassium thiocyanate.
  • the temperature of the molten salt bath can be considerably reduced, to 150- 200 C., which enables parts to be treated, especially of special steels, without reducing their hardness.
  • molten salt bath a mixture of thiocyanates in a eutectic proportion, namely 25 of sodium thiocyanate and 75 of potassium thiocyanate.
  • This mixture has the property of melting at 125 C., which is a relatively-low temperature as compared with that of the usual molten salt baths, and enables treatment to be carried out at 150-200 C., as indicated above.
  • ferricyanide a ferrocyanide or a mixture of these two.
  • This addition is made in small proportions; an advantageous proportion is 0.9% of ferricyanide and 0.1% of ferrocyanide.
  • This addition has the advantage of facilitating the application of the method in the case of treatment of parts of complicated shapes.
  • the method according to the invention is applicable to all metal parts, the surface of which contains a large proportion of iron, nickel or both these metals. It gives particularly important results with steel'parts when they have been previously case-hardened and tempered or nitrided.
  • EXAMPLES Example 1 tive pole. The electrolysis is carried out for 15 minutes with a current density of 2.5 amperes per square decimeter with an anode-cathode voltage of 0.8 to 2 volts.
  • the part thus treated is washed for 2 hours in running water to dissolve the dried salts of the bath, and then brushed with a metal brush and subjected to the Faville test. Placed between two jaws cut to a V at 90, of 16N6 steel case-hardened, tempered, untreated, this part is rotated at 350 rpm. whilst there is applied to the jaws a gripping force which increases at the rate of 5 kilograms-force per second.
  • the test is stopped either when the part seizes or when the creep of the test-piece which heats-up compensates for the approach of the jaws.
  • the index of quality is supplied by the value f fdt in which t represents the duration of the test.
  • test sample treated with the above-mentioned bath creeps without seizure after seconds.
  • the index of quality exceeds 30,000 kg.-f./sec.
  • Example 2 The surface condition is improved by adding to the eutectic bath of Example 1:
  • Example 3 In a bath of molten salts identical with that of Example 2, there is treated a test sample of steel previously treated by nitridation to a depth of 0.5 mm.
  • the electrolytic treatment carried out under the same conditions as Examples 1 and 2 has the result of increasing three-fold the quality index of the Faville test.
  • Example 4 In order to improve the surface condition while reducing the potential difference between anode and cathode, there is blown-in at the base of the crucible a mixture of nitrogen and hydrogen comprising 60% of nitrogen and 40% of hydrogen by volume.
  • Example A part made of case-hardened tempered steel treated as in Example 1, has irregularities of surface probably due to local differences of potential.
  • the roughness of the part is increased in consequence of the treatment by electrolysis; it passes from 3 to 5 microinches (centerline average) or the AFNOR Standard (French Standards Association) PNE 05-012, to 25-30 microinches CLA.
  • the final roughness after electrolytic treatment in the bath of molten thiocyanates is only to 12 microinches CLA.
  • a method of treating the surface of a part of ferrous metal in order to reduce its friction and improve its wear resistance comprising the steps of immersing the part in a bath of molten salts consisting essentially of a eutectic mixture of 25% sodium thiocyanate and potassium thiocyanate, passing an electric current through the part and the bath with the part connected as the anode, and maintaining the temperature of the bath at 150 to 200 C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Coating With Molten Metal (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Investigating And Analyzing Materials By Characteristic Methods (AREA)
  • Heat Treatment Of Articles (AREA)
US582269A 1964-05-28 1966-09-27 Method of electrolytically sulfiding ferrous parts in a thiocyanate bath Expired - Lifetime US3475291A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR976152A FR1406530A (fr) 1964-05-28 1964-05-28 Procédé de traitement de surfaces métalliques et produits ainsi traités
FR978879A FR85988E (fr) 1964-05-28 1964-06-19 Procédé de traitement de surfaces métalliques et produits ainsi traités
FR995219A FR86729E (fr) 1964-05-28 1964-11-17 Procédé de traitement de surfaces métalliques et produits ainsi traités
FR35043A FR88839E (fr) 1964-05-28 1965-10-15 Procédé de traitement de surfaces métalliques et produits ainsi traités

Publications (1)

Publication Number Publication Date
US3475291A true US3475291A (en) 1969-10-28

Family

ID=27444487

Family Applications (2)

Application Number Title Priority Date Filing Date
US582269A Expired - Lifetime US3475291A (en) 1964-05-28 1966-09-27 Method of electrolytically sulfiding ferrous parts in a thiocyanate bath
US691110A Expired - Lifetime US3467585A (en) 1964-05-28 1967-12-08 Method for treating steel by electrolysis in a molten thiocyanate

Family Applications After (1)

Application Number Title Priority Date Filing Date
US691110A Expired - Lifetime US3467585A (en) 1964-05-28 1967-12-08 Method for treating steel by electrolysis in a molten thiocyanate

Country Status (4)

Country Link
US (2) US3475291A (de)
DE (2) DE1521285B2 (de)
FR (4) FR1406530A (de)
GB (2) GB1059619A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006043A (en) * 1974-05-17 1977-02-01 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
US20100044234A1 (en) * 2006-11-24 2010-02-25 H.E.F. Sulphuration method of ferrous alloy parts in an aqueous solution

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1406530A (fr) * 1964-05-28 1965-07-23 Hydromecanique Et Frottement S Procédé de traitement de surfaces métalliques et produits ainsi traités
DE2450291A1 (de) * 1974-10-23 1976-05-06 Friedrich Von Dipl Stutterheim Verfahren zur kontinuierlichen elektrolytischen metallbeschichtung von draehten, baendern, ketten und netzbaendern
FR2531458A1 (fr) * 1982-08-04 1984-02-10 Stephanois Rech Mec Procede de traitement superficiel de surfaces ferreuses pour ameliorer leurs qualites de frottement et de resistance a l'usure et au grippage

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953647A (en) * 1931-11-11 1934-04-03 William A Darrah Process of treating metal
US1961520A (en) * 1932-03-03 1934-06-05 Chapman Valve Mfg Co Method of case hardening steel
US2231009A (en) * 1938-02-24 1941-02-11 Du Pont Heat treating process
US2339223A (en) * 1940-05-23 1944-01-11 Du Pont Method of case hardening
FR1023696A (fr) * 1950-08-23 1953-03-23 Applic Des Produits Speciaux S Procédé pour obtenir sur des pièces en métaux ou alliages ferreux simultanément une couche nitrurée et une couche superficielle ayant des propriétés lubrifiantes
US2707159A (en) * 1947-02-19 1955-04-26 Lubri Case Inc Wear-resistant ferrous metal articles and their production
CA697224A (en) * 1964-11-03 Muller Johannes Process for the nitriding of ferrous metals in fused salt baths containing cyanate
FR1406530A (fr) * 1964-05-28 1965-07-23 Hydromecanique Et Frottement S Procédé de traitement de surfaces métalliques et produits ainsi traités
US3331708A (en) * 1964-03-23 1967-07-18 Thomas J Buitkus Electrolytic case hardening

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2057274A (en) * 1933-05-16 1936-10-13 Mayhew Wallace Nelson Process for heat treating ferrous metals

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA697224A (en) * 1964-11-03 Muller Johannes Process for the nitriding of ferrous metals in fused salt baths containing cyanate
US1953647A (en) * 1931-11-11 1934-04-03 William A Darrah Process of treating metal
US1961520A (en) * 1932-03-03 1934-06-05 Chapman Valve Mfg Co Method of case hardening steel
US2231009A (en) * 1938-02-24 1941-02-11 Du Pont Heat treating process
US2339223A (en) * 1940-05-23 1944-01-11 Du Pont Method of case hardening
US2707159A (en) * 1947-02-19 1955-04-26 Lubri Case Inc Wear-resistant ferrous metal articles and their production
FR1023696A (fr) * 1950-08-23 1953-03-23 Applic Des Produits Speciaux S Procédé pour obtenir sur des pièces en métaux ou alliages ferreux simultanément une couche nitrurée et une couche superficielle ayant des propriétés lubrifiantes
US3331708A (en) * 1964-03-23 1967-07-18 Thomas J Buitkus Electrolytic case hardening
FR1406530A (fr) * 1964-05-28 1965-07-23 Hydromecanique Et Frottement S Procédé de traitement de surfaces métalliques et produits ainsi traités

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4006043A (en) * 1974-05-17 1977-02-01 Centre Stephanois De Recherches Mecaniques Hydromecanique Et Frottement Method of maintaining at very low values the content of cyanide in salt baths containing cyanates
US20100044234A1 (en) * 2006-11-24 2010-02-25 H.E.F. Sulphuration method of ferrous alloy parts in an aqueous solution
US8562812B2 (en) 2006-11-24 2013-10-22 H.E.F. Sulphuration method of ferrous alloy parts in an aqueous solution

Also Published As

Publication number Publication date
DE1521292B2 (de) 1973-01-25
US3467585A (en) 1969-09-16
GB1148988A (en) 1969-04-16
DE1521285B2 (de) 1971-01-21
FR86729E (fr) 1966-04-01
GB1059619A (en) 1967-02-22
FR1406530A (fr) 1965-07-23
FR85988E (fr) 1965-11-19
DE1521285A1 (de) 1969-08-07
DE1521292C3 (de) 1975-10-23
FR88839E (fr) 1967-03-31
DE1521292A1 (de) 1969-10-09

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