EP0480876A2 - Elektrolytisch erzeugter Überzug in Form einer Kupfer und Zink enthaltender Goldlegierung sowie Verfahren zu dessen Herstellung - Google Patents

Elektrolytisch erzeugter Überzug in Form einer Kupfer und Zink enthaltender Goldlegierung sowie Verfahren zu dessen Herstellung Download PDF

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Publication number
EP0480876A2
EP0480876A2 EP91810773A EP91810773A EP0480876A2 EP 0480876 A2 EP0480876 A2 EP 0480876A2 EP 91810773 A EP91810773 A EP 91810773A EP 91810773 A EP91810773 A EP 91810773A EP 0480876 A2 EP0480876 A2 EP 0480876A2
Authority
EP
European Patent Office
Prior art keywords
electrolysis
copper
zinc
deposit
cyanide
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.)
Withdrawn
Application number
EP91810773A
Other languages
English (en)
French (fr)
Other versions
EP0480876A3 (en
Inventor
Pierre-André Aeby
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.)
METAUX PRECIEUX
Metaux Precieux Metalor SA
Original Assignee
METAUX PRECIEUX
Metaux Precieux Metalor SA
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 METAUX PRECIEUX, Metaux Precieux Metalor SA filed Critical METAUX PRECIEUX
Publication of EP0480876A2 publication Critical patent/EP0480876A2/de
Publication of EP0480876A3 publication Critical patent/EP0480876A3/fr
Withdrawn legal-status Critical Current

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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
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/62—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of gold

Definitions

  • the invention relates to an electrolytic deposit in the form of a gold alloy whose title is greater than or equal to 14 carats, containing zinc and copper, as well as its production process.
  • the invention aims to provide an electrolytic deposit of gold whose title can reach 18 carats, containing copper, free of toxic metals or metalloids, but having qualities identical to electrolytic deposits containing cadmium up to a thickness of 10 microns .
  • the subject of the invention is an electrolytic deposit in the form of a gold alloy whose title is greater than or equal to 14 carats containing zinc and copper, characterized in that it is free from toxic metals or metalloids, and in that it has a tint between the ranges 1N and 3N (according to standard ISO 8654), ductile up to a thickness of 10 microns, shiny, and that it has a very high resistance to tarnishing.
  • the invention also relates to a process for the production of such an electrolytic deposit.
  • This process consists of carrying out electrolysis in an alkaline galvanic bath containing from 1 to 10 g / l of gold in the form of gold and potassium cyanide, from 20 to 40 g / l of copper in the form of copper cyanide, 5 to 10 g / l of zinc in the form of zinc oxide, sodium cyanide, sodium hydroxide, imminodiacetic acid and a surfactant.
  • the electrolysis is preferably followed by a heat treatment at at least 150 ° C for at least 1 hour in order to obtain a deposit of optimal quality.
  • the bath can also contain a brightener.
  • a brightener This is preferably a derivative of butynediol, a pyridinio-propanesulfonate or a mixture of the two, or a tin salt.
  • the surfactant is preferably a phosphonic ester of a linear alcohol or a phosphoric ester of a linear alcohol.
  • the electrolysis is preferably carried out at a temperature between 60 and 75 ° C in an alkaline galvanic bath whose pH is between 9.0 and 10.0.
  • Electrolysis can be carried out with a current density of between 0.5 and 2.0 A / dm2.
  • the heat treatment is preferably carried out at a temperature below 250 ° C for a time between 2 and 24 hours.
  • an 18-carat gold alloy free of toxic metals or metalloids, in particular free of cadmium, of pale yellow shade 1N, of hardness between 250 and 300 HV 0.005, ductile up to at a thickness of 10 microns, of excellent gloss and having a very high resistance to wear and tarnishing.
  • This deposit is obtained by electrolysis in an electrolytic bath followed by a heat treatment at 200 ° C for 3 hours.
  • This electrolysis is carried out in an electrolytic bath containing the following compounds:
  • a 14-carat gold alloy free of toxic metals or metalloids, in particular free of cadmium, of pale yellow 1N shade, of hardness between 250 and 300 HV 0.005, ductile up to at a thickness of 10 microns, of excellent gloss and having a very high resistance to wear and tarnishing.
  • This deposit is obtained by electrolysis in an electrolytic bath.
  • This electrolysis is carried out in an electrolytic bath containing the following compounds:
  • This deposit is obtained by electrolysis in an electrolytic bath followed by a heat treatment at 200 ° C for 3 hours.
  • This electrolysis is carried out in an electrolytic bath containing the following compounds:
  • the electrolytic bath contained in a polypropylene or PVC tank with heat-insulating coating, has a pH of 9.5 and its temperature is 70 ° C.
  • the bath is heated by quartz, PTFE, porcelain or stabilized stainless steel immersion heaters. Its density is between 16 and 30 ° Bé at 20 ° C. Good cathodic agitation and circulation of the electrolyte must be maintained.
  • the anodes are made of platinum titanium or stainless steel. These electrolyses are carried out with a current of 1 A / dm2.

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)
EP19910810773 1990-10-08 1991-10-01 Electrodeposition of a gold alloy containing copper and zinc and its method of production Withdrawn EP0480876A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3238/90 1990-10-08
CH323890A CH680927A5 (de) 1990-10-08 1990-10-08

Publications (2)

Publication Number Publication Date
EP0480876A2 true EP0480876A2 (de) 1992-04-15
EP0480876A3 EP0480876A3 (en) 1993-09-08

Family

ID=4251645

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910810773 Withdrawn EP0480876A3 (en) 1990-10-08 1991-10-01 Electrodeposition of a gold alloy containing copper and zinc and its method of production

Country Status (2)

Country Link
EP (1) EP0480876A3 (de)
CH (1) CH680927A5 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476079A (en) * 1993-12-03 1995-12-19 Nippondenso Co., Ltd. Electromagnetic valve for opening or closing fluid passage
GB2306508A (en) * 1995-11-03 1997-05-07 Enthone Omi Gold-iron alloy electroplating processes compositions and deposits
DE19730007C1 (de) * 1997-07-12 1999-03-25 Mtu Muenchen Gmbh Verfahren und Vorrichtung zur Gasphasendiffusionsbeschichtung von Werkstücken aus warmfestem Material mit einem Beschichtungsmaterial
US6576114B1 (en) 1995-11-03 2003-06-10 Enthone Inc. Electroplating composition bath
WO2008040761A3 (fr) * 2006-10-03 2008-11-06 Swatch Group Res & Dev Ltd Procede d'electroformage et piece ou couche obtenue par ce procede
US9567684B2 (en) 2009-10-15 2017-02-14 The Swatch Group Research And Development Ltd Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic materials
US9683303B2 (en) 2007-09-21 2017-06-20 The Swatch Group Research And Development Ltd Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic metals or metalloids

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151661A (en) * 1983-12-17 1985-07-24 Lpw Chemie Gmbh Deposition of gold-copper-zinc alloys

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2151661A (en) * 1983-12-17 1985-07-24 Lpw Chemie Gmbh Deposition of gold-copper-zinc alloys

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
CHEMICAL ABSTRACTS, vol. 101, no. 10 Columbus, Ohio, US; abstract no. 80764u, 'DECREASINGOF FREECYANIDE IN GOLD ELECTROPLATING BATHS' *
CHEMICAL ABSTRACTS, vol. 95, no. 1 Columbus, Ohio, US; abstract no. 15175w, 'ELECTROPLATING HARD GOLD ALLOYS' *

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5476079A (en) * 1993-12-03 1995-12-19 Nippondenso Co., Ltd. Electromagnetic valve for opening or closing fluid passage
GB2306508A (en) * 1995-11-03 1997-05-07 Enthone Omi Gold-iron alloy electroplating processes compositions and deposits
GB2306508B (en) * 1995-11-03 1999-04-28 Enthone Omi Electroplating processes compositions and deposits
US6576114B1 (en) 1995-11-03 2003-06-10 Enthone Inc. Electroplating composition bath
DE19730007C1 (de) * 1997-07-12 1999-03-25 Mtu Muenchen Gmbh Verfahren und Vorrichtung zur Gasphasendiffusionsbeschichtung von Werkstücken aus warmfestem Material mit einem Beschichtungsmaterial
WO2008040761A3 (fr) * 2006-10-03 2008-11-06 Swatch Group Res & Dev Ltd Procede d'electroformage et piece ou couche obtenue par ce procede
JP2010506040A (ja) * 2006-10-03 2010-02-25 ザ スウォッチ グループ リサーチ アンド ディベロップメント リミティド． 電気鋳造方法とこの方法によって得られた部品または層
KR101326883B1 (ko) * 2006-10-03 2013-11-11 더 스와치 그룹 리서치 앤 디벨롭먼트 엘티디 전기주조 방법 및 상기 방법을 이용하여 수득한 부품 또는 막
US9683303B2 (en) 2007-09-21 2017-06-20 The Swatch Group Research And Development Ltd Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic metals or metalloids
US10233555B2 (en) 2007-09-21 2019-03-19 The Swatch Group Research And Development Ltd. Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic metals or metalloids
US10619260B2 (en) 2007-09-21 2020-04-14 The Swatch Group Research And Development Ltd. Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic metals or metalloids
US9567684B2 (en) 2009-10-15 2017-02-14 The Swatch Group Research And Development Ltd Method of obtaining a yellow gold alloy deposition by galvanoplasty without using toxic materials

Also Published As

Publication number Publication date
EP0480876A3 (en) 1993-09-08
CH680927A5 (de) 1992-12-15

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