GB1184749A - Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor - Google Patents

Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor

Info

Publication number
GB1184749A
GB1184749A GB4948768A GB4948768A GB1184749A GB 1184749 A GB1184749 A GB 1184749A GB 4948768 A GB4948768 A GB 4948768A GB 4948768 A GB4948768 A GB 4948768A GB 1184749 A GB1184749 A GB 1184749A
Authority
GB
United Kingdom
Prior art keywords
base
phenols
electrolytic removal
electroplating
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
GB4948768A
Inventor
Horst Dillenberg
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.)
Dillenberg Bergische Metall
Original Assignee
Dillenberg Bergische Metall
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 Dillenberg Bergische Metall filed Critical Dillenberg Bergische Metall
Priority to GB4948768A priority Critical patent/GB1184749A/en
Publication of GB1184749A publication Critical patent/GB1184749A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25F—PROCESSES FOR THE ELECTROLYTIC REMOVAL OF MATERIALS FROM OBJECTS; APPARATUS THEREFOR
    • C25F5/00—Electrolytic stripping of metallic layers or coatings

Landscapes

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

Abstract

1,184,749. Electrolytic removal of electroplating. BERGISCHE METALLWARENFABRIK DILLENBERG & CO. K.G. Oct.18, 1968, No.49487/68. Heading C7B. A bath for the electrolytic removal or stripping of Cr, Ni or Au electro-plating from Cu, Cu alloy, Ag, Zn or Ti bases comprises in aqueous solution a salt of thiocyanic acid (e.g. ammonium thiocyanate) and one or more phenols selected from mono-, di- and tri-hydric phenols and homologues thereof. Specified phenols are:- phenol, dihydroxybenzenes (catechol, resorcinol, and quinol), trihydroxy benzenes (pyrogallol, phloroglucinol and hydroxyquinol), cresol, thymol, xylenol and their nitrocompounds such as nitrophenol dinitrophenol and nitrocatechol. The pH of the bath is found to be between 6 and 6À5. Using the base as anode, a minimum anode current density of 8 amps/dm<SP>2</SP> is applied using a stainless steel cathode, the treatment being carried out at 20-60‹ C. A waterrepellant layer, which does not transmit current, forms on the base during the stripping process and prevents erosion of the base. The protective layer can be removed later by dipping the base in NaOH solution.
GB4948768A 1968-10-18 1968-10-18 Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor Expired GB1184749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4948768A GB1184749A (en) 1968-10-18 1968-10-18 Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4948768A GB1184749A (en) 1968-10-18 1968-10-18 Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor

Publications (1)

Publication Number Publication Date
GB1184749A true GB1184749A (en) 1970-03-18

Family

ID=10452520

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4948768A Expired GB1184749A (en) 1968-10-18 1968-10-18 Improvements in or relating to the Electrolytic removal of Electroplating and Baths therefor

Country Status (1)

Country Link
GB (1) GB1184749A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2229735A (en) * 1989-03-17 1990-10-03 Bostock Jill Electrolytic recovery of precious metals from electromechanical contacts

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2229735A (en) * 1989-03-17 1990-10-03 Bostock Jill Electrolytic recovery of precious metals from electromechanical contacts
GB2229735B (en) * 1989-03-17 1993-05-19 Bostock Jill Recovery of precious metals from electro-mechanical contacts

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees