FR2319721A1 - Chromium electroplating bath using trivalent chromium - where potassium ferrocyanide soln. is added to remove harmful impurities(BE030177) - Google Patents

Chromium electroplating bath using trivalent chromium - where potassium ferrocyanide soln. is added to remove harmful impurities(BE030177)

Info

Publication number
FR2319721A1
FR2319721A1 FR7620391A FR7620391A FR2319721A1 FR 2319721 A1 FR2319721 A1 FR 2319721A1 FR 7620391 A FR7620391 A FR 7620391A FR 7620391 A FR7620391 A FR 7620391A FR 2319721 A1 FR2319721 A1 FR 2319721A1
Authority
FR
France
Prior art keywords
soln
added
chromium
ferrocyanide
impurities
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
FR7620391A
Other languages
French (fr)
Other versions
FR2319721B1 (en
Inventor
John Cooper Crowther
Stanley Renton
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.)
Solvay Solutions UK Ltd
Original Assignee
Albright and Wilson Ltd
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
Priority claimed from GB28055/75A external-priority patent/GB1558169A/en
Application filed by Albright and Wilson Ltd filed Critical Albright and Wilson Ltd
Priority claimed from KR7603197A external-priority patent/KR800001242B1/en
Publication of FR2319721A1 publication Critical patent/FR2319721A1/en
Application granted granted Critical
Publication of FR2319721B1 publication Critical patent/FR2319721B1/fr
Granted legal-status Critical Current

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
    • C25D3/06—Electroplating: Baths therefor from solutions of chromium from solutions of trivalent chromium

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

Abstract

Process for maintaining the efficiency of a chromium electroplating bath which employs trivalent chromium but exhibits plating defects due to traces of metal impurities. A sufficient amt. of a water-soluble ferrocyanide, such as potassium ferrocyanide, is added to the bath to remove the metal impurities. The plating soln. can be tested for impurities using a filter paper impregnated in one zone with the ferrocyanide soln. and in another zone with a soluble iorn slat, and observing the change in colour. Typically 7mls. of a 20% soln. of ferrocyanide is added 1ml. at a time to treat a bath contg. 50ppm. mettalic impurities. Prevents plating defects such as a white bloom, brown spots and/or inadequate adhesion.
FR7620391A 1975-07-03 1976-07-02 Chromium electroplating bath using trivalent chromium - where potassium ferrocyanide soln. is added to remove harmful impurities(BE030177) Granted FR2319721A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB28055/75A GB1558169A (en) 1975-07-03 1975-07-03 Chromium electroplating
GB5180175 1975-12-18
KR7603197A KR800001242B1 (en) 1975-12-18 1976-12-28 Chromium electroplating

Publications (2)

Publication Number Publication Date
FR2319721A1 true FR2319721A1 (en) 1977-02-25
FR2319721B1 FR2319721B1 (en) 1979-07-20

Family

ID=27258682

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7620391A Granted FR2319721A1 (en) 1975-07-03 1976-07-02 Chromium electroplating bath using trivalent chromium - where potassium ferrocyanide soln. is added to remove harmful impurities(BE030177)

Country Status (7)

Country Link
AU (1) AU497515B2 (en)
BR (1) BR7604381A (en)
CA (1) CA1084441A (en)
DE (1) DE2629879C3 (en)
ES (1) ES449498A1 (en)
FR (1) FR2319721A1 (en)
NL (1) NL183660C (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612091A (en) * 1982-06-30 1986-09-16 Asociation Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels Chromium electroplating trivalent chrominum bath therefore and method of making such bath
WO2001096632A2 (en) * 2000-06-15 2001-12-20 Applied Materials, Inc. A method and apparatus for conditioning electrochemical baths in plating technology

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2034354B (en) * 1978-11-11 1982-12-01 Ibm Elimination of anode hydrogen cyanide formation in trivalent chromium plating
US4432843A (en) * 1982-07-29 1984-02-21 Omi International Corporation Trivalent chromium electroplating baths and processes using thiazole addition agents

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE608806C (en) 1932-04-01 1935-02-01 Siemens & Halske Akt Ges Process for eliminating the iron that accumulates in the chromium electrolyte

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE608806C (en) 1932-04-01 1935-02-01 Siemens & Halske Akt Ges Process for eliminating the iron that accumulates in the chromium electrolyte

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NEANT *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4612091A (en) * 1982-06-30 1986-09-16 Asociation Pour La Recherche Et Le Developpement Des Methodes Et Processus Industriels Chromium electroplating trivalent chrominum bath therefore and method of making such bath
WO2001096632A2 (en) * 2000-06-15 2001-12-20 Applied Materials, Inc. A method and apparatus for conditioning electrochemical baths in plating technology
WO2001096632A3 (en) * 2000-06-15 2005-05-12 Applied Materials Inc A method and apparatus for conditioning electrochemical baths in plating technology

Also Published As

Publication number Publication date
CA1084441A (en) 1980-08-26
NL183660B (en) 1988-07-18
DE2629879A1 (en) 1977-01-20
DE2629879B2 (en) 1979-12-13
AU1560576A (en) 1978-01-12
DE2629879C3 (en) 1980-08-14
FR2319721B1 (en) 1979-07-20
AU497515B2 (en) 1978-12-14
BR7604381A (en) 1977-07-26
NL183660C (en) 1988-12-16
ES449498A1 (en) 1977-11-16
NL7607319A (en) 1977-01-05

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