GB1096017A - Improvements in or relating to the electrodeposition of chromium - Google Patents

Improvements in or relating to the electrodeposition of chromium

Info

Publication number
GB1096017A
GB1096017A GB3732764A GB3732764A GB1096017A GB 1096017 A GB1096017 A GB 1096017A GB 3732764 A GB3732764 A GB 3732764A GB 3732764 A GB3732764 A GB 3732764A GB 1096017 A GB1096017 A GB 1096017A
Authority
GB
United Kingdom
Prior art keywords
fluoro
sulphate
carbon
strontium
bath
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
GB3732764A
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.)
Udylite Corp
Original Assignee
Udylite Corp
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 Udylite Corp filed Critical Udylite Corp
Publication of GB1096017A publication Critical patent/GB1096017A/en
Expired 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
    • C25D3/10—Electroplating: Baths therefor from solutions of chromium characterised by the organic bath constituents used

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)

Abstract

A bath for the electro-deposition of chromium plate comprises an acidic hexavalent chromium solution in which is dissolved strontium sulphate and at least one fluoro carbon sulphonic or/and fluoro carbon phosphonic acid, said bath also containing undissolved strontium sulphate. The fluoro carbon sulphonic and fluoro carbon phosphonic acids used may comprise short chain, non-surface active acids, e.g. CF3SO3H; CF3CH2SO3H; CF3CF2SO3H; CF3CF2CF2SO3H; HCF2CF2SO3H; HCF Cl CF2SO3H; H(CF2CF2)nPO(OH)2; H(CF Cl CF2)nPO(OH)2 where n = 1, 2, or 3; fluoro-para-methyl-, or -ethyl-cyclohexyl sulphonic acids; perfluoro-cyclohexyl meta-disulphonic acid; perfluoro-p-methyl or ethyl cyclohexyl sulphonic acids &c. The bath may also contain strontium chromate, strontium carbonate or boric acid. The ratio of hexavalent chromium (calculated as CrO3) to that of sulphate ions may, under various conditions be varied from 75:1 to 400:1; the concentration of hexavalent chromium may be from 75 to 500 gr/litre, and that of fluoro-carbon-phosphonic and -sulphonic acids from 0.5 to 30 gr/litre. With a ratio of chromate to sulphate ions of from 120:1 to 400:1 the strontium sulphate may be replaced in part by at least one other sulphate, the bath still containing undissolved strontium sulphate. If fluoro-carbon-sulphonic acids containing a perfluorocyclohexyl ring are used in concentrations of 5-10 gr/l they may also eliminate the chromic acid mist evolved during plating. Reference has been directed by the Comptroller to Specification 758,025.
GB3732764A 1963-09-11 1964-09-11 Improvements in or relating to the electrodeposition of chromium Expired GB1096017A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US30806963A 1963-09-11 1963-09-11
US39023864A 1964-08-17 1964-08-17

Publications (1)

Publication Number Publication Date
GB1096017A true GB1096017A (en) 1967-12-20

Family

ID=26976081

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3732764A Expired GB1096017A (en) 1963-09-11 1964-09-11 Improvements in or relating to the electrodeposition of chromium

Country Status (2)

Country Link
DE (1) DE1521066A1 (en)
GB (1) GB1096017A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007140850A1 (en) * 2006-06-02 2007-12-13 Merck Patent Gmbh Use of phosphinic acids and/or phosphonic acids in redox processes
WO2007144336A2 (en) * 2006-06-13 2007-12-21 Wolf-Dieter Franz Cr(vi)-free black chroming

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3339481A1 (en) * 2016-12-21 2018-06-27 Dr. M. Kampschulte GmbH & Co. KG Method and kit of parts for the pretreatment of objects to be chromed

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007140850A1 (en) * 2006-06-02 2007-12-13 Merck Patent Gmbh Use of phosphinic acids and/or phosphonic acids in redox processes
JP2009538982A (en) * 2006-06-02 2009-11-12 メルク パテント ゲゼルシャフト ミット ベシュレンクテル ハフツング Use of phosphinic acid and / or phosphonic acid in redox processes
US8282808B2 (en) 2006-06-02 2012-10-09 Merck Patent Gmbh Use of phosphinic acids and/or phosphonic acids in redox processes
WO2007144336A2 (en) * 2006-06-13 2007-12-21 Wolf-Dieter Franz Cr(vi)-free black chroming
EP1876268A1 (en) 2006-06-13 2008-01-09 Wolf-Dieter Franz Black chromium process free of Cr-VI
WO2007144336A3 (en) * 2006-06-13 2008-02-28 Wolf-Dieter Franz Cr(vi)-free black chroming

Also Published As

Publication number Publication date
DE1521066A1 (en) 1969-08-07

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