MX9307677A - Procedimiento de cromado de piezas de frotamiento. - Google Patents

Procedimiento de cromado de piezas de frotamiento.

Info

Publication number
MX9307677A
MX9307677A MX9307677A MX9307677A MX9307677A MX 9307677 A MX9307677 A MX 9307677A MX 9307677 A MX9307677 A MX 9307677A MX 9307677 A MX9307677 A MX 9307677A MX 9307677 A MX9307677 A MX 9307677A
Authority
MX
Mexico
Prior art keywords
current
chrome
cathodic
pieces
procedure
Prior art date
Application number
MX9307677A
Other languages
English (en)
Inventor
Bernard Sutter
Gerard Vasseur
Jean Reby
Original Assignee
Centre Techn Ind Mecanique
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 Techn Ind Mecanique filed Critical Centre Techn Ind Mecanique
Publication of MX9307677A publication Critical patent/MX9307677A/es

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/04—Electroplating: Baths therefor from solutions of chromium
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/18—Electroplating using modulated, pulsed or reversing current
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/605—Surface topography of the layers, e.g. rough, dendritic or nodular layers
    • C25D5/611—Smooth layers
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/60—Electroplating characterised by the structure or texture of the layers
    • C25D5/615—Microstructure of the layers, e.g. mixed structure
    • C25D5/617—Crystalline layers

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

Para cromar piezas de frotamiento, se utiliza un cromado electrolítico con corriente pulsada con inversión de corriente, operando con los parámetros siguientes: Ic densidad de corriente catódica promedio. Ia densidad de corriente anódica promedio; la corriente es continua, cortada o a fondo continua con superimposición de una señal periódica. Tc duración de los impulsos catódicos. Ta duración de los impulsos anódicos. Qc cantidad de corriente catódica. Qa cantidad de corriente anódica, en las relaciones siguientes: 0.01s ¾ Tc ¾ 200 s y de preferencia ¾ 50 s. 1 ms ¾ Ta ¾ 100 s y de preferencia � 7 ms. 20A/dm2 ¾ Ic ¾ 200A/dm2. 1A/dm2 ¾ Ia ¾ 5 Ic.
MX9307677A 1992-12-07 1993-12-06 Procedimiento de cromado de piezas de frotamiento. MX9307677A (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR9214699A FR2698888B1 (fr) 1992-12-07 1992-12-07 Procédé de chromage de pièces de frottement.

Publications (1)

Publication Number Publication Date
MX9307677A true MX9307677A (es) 1994-06-30

Family

ID=9436288

Family Applications (1)

Application Number Title Priority Date Filing Date
MX9307677A MX9307677A (es) 1992-12-07 1993-12-06 Procedimiento de cromado de piezas de frotamiento.

Country Status (3)

Country Link
FR (1) FR2698888B1 (es)
MX (1) MX9307677A (es)
WO (1) WO1994013864A1 (es)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19713566C2 (de) * 1997-04-02 1999-11-18 Daimler Chrysler Ag Verfahren zum Herstellen eines Formwerkzeugs, Vorrichtung zum Schäumen von Formschaumteilen sowie Verfahren zum Herstellen eines Formwerkzeugs
US7011067B2 (en) * 2002-08-19 2006-03-14 Trw Chrome plated engine valve
US20050067790A1 (en) * 2003-09-26 2005-03-31 Smith Thomas J. Piston ring having chromium coating

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2586711B1 (fr) * 1985-09-03 1989-10-06 Centre Techn Ind Mecanique Procede et installation de chromage electrolytique

Also Published As

Publication number Publication date
FR2698888B1 (fr) 1995-02-10
WO1994013864A1 (fr) 1994-06-23
FR2698888A1 (fr) 1994-06-10

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