GB2196988A - Electrolytic bath for forming a glossy black chromium coating layer - Google Patents

Electrolytic bath for forming a glossy black chromium coating layer

Info

Publication number
GB2196988A
GB2196988A GB08724086A GB8724086A GB2196988A GB 2196988 A GB2196988 A GB 2196988A GB 08724086 A GB08724086 A GB 08724086A GB 8724086 A GB8724086 A GB 8724086A GB 2196988 A GB2196988 A GB 2196988A
Authority
GB
United Kingdom
Prior art keywords
concentration
coating layer
electrolytic bath
chromium coating
forming
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
GB08724086A
Other versions
GB2196988B (en
GB8724086D0 (en
Inventor
Ferenc Magyar
Jeno Pojbics
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.)
Licencia Talalmanyokat Ertekesito Vallalat
Original Assignee
Licencia Talalmanyokat Ertekesito Vallalat
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 Licencia Talalmanyokat Ertekesito Vallalat filed Critical Licencia Talalmanyokat Ertekesito Vallalat
Publication of GB8724086D0 publication Critical patent/GB8724086D0/en
Publication of GB2196988A publication Critical patent/GB2196988A/en
Application granted granted Critical
Publication of GB2196988B publication Critical patent/GB2196988B/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • C25D3/08—Deposition of black chromium, e.g. hexavalent chromium, CrVI

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)
  • Chemical Treatment Of Metals (AREA)

Abstract

An electrolytic bath for the formation of a glossy black chromium coating layer on a substrate of iron, steel, nonferrous heavy metal or alloys thereof comprises a concentration between 300 and 440 g/l of chromic anhydride, 10 and 30 g/l of phosphate ions and nitrate ions of which the concentration corresponds to the presence of ammonium nitrate in a concentration comprised between 1 and 2 g/l, and optionally a concentration of baryum carbonate comprised between 5 and 8 g/l and a concentration of fluoride ions comprised between 5 and 20 mg/l.
GB8724086A 1986-02-19 1987-02-19 Electrolytic bath for forming a glossy black chromium coating Expired - Fee Related GB2196988B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU70286A HU198970B (en) 1986-02-19 1986-02-19 Electrolysis bath for making bright, black chromium plating

Publications (3)

Publication Number Publication Date
GB8724086D0 GB8724086D0 (en) 1987-11-18
GB2196988A true GB2196988A (en) 1988-05-11
GB2196988B GB2196988B (en) 1990-05-02

Family

ID=10950923

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8724086A Expired - Fee Related GB2196988B (en) 1986-02-19 1987-02-19 Electrolytic bath for forming a glossy black chromium coating

Country Status (5)

Country Link
AU (1) AU7036087A (en)
DE (1) DE3790088D2 (en)
GB (1) GB2196988B (en)
HU (1) HU198970B (en)
WO (1) WO1987005056A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230275A (en) * 1989-02-27 1990-10-17 Omi Int Corp Conversion composition and process

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU611957B2 (en) * 1988-10-13 1991-06-27 Council Of Scientific And Industrial Research Improved black chromium plating bath useful for solar selective coatings

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1449446A (en) * 1974-04-05 1976-09-15 Kampschulte & Cie Dr W Electrolysis baths
DE1621060C3 (en) * 1966-04-08 1978-01-19 Du Pont AQUATIC BATH FOR GALVANIC DEPOSITION OF BLACK CHROME COATINGS
GB2024863A (en) * 1978-06-02 1980-01-16 Bnf Metals Tech Centre Black chromium deposits
SU827606A1 (en) * 1978-06-19 1981-05-07 Предприятие П/Я Р-6762 Electrolyte for precipitating black chrome coatings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1621060C3 (en) * 1966-04-08 1978-01-19 Du Pont AQUATIC BATH FOR GALVANIC DEPOSITION OF BLACK CHROME COATINGS
GB1449446A (en) * 1974-04-05 1976-09-15 Kampschulte & Cie Dr W Electrolysis baths
GB2024863A (en) * 1978-06-02 1980-01-16 Bnf Metals Tech Centre Black chromium deposits
SU827606A1 (en) * 1978-06-19 1981-05-07 Предприятие П/Я Р-6762 Electrolyte for precipitating black chrome coatings

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2230275A (en) * 1989-02-27 1990-10-17 Omi Int Corp Conversion composition and process

Also Published As

Publication number Publication date
DE3790088D2 (en) 1988-08-25
AU7036087A (en) 1987-09-09
GB2196988B (en) 1990-05-02
GB8724086D0 (en) 1987-11-18
WO1987005056A1 (en) 1987-08-27
HU198970B (en) 1989-12-28
HUT43121A (en) 1987-09-28

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee