US2702271A - Process for the deposition of gold or gold alloys - Google Patents

Process for the deposition of gold or gold alloys Download PDF

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Publication number
US2702271A
US2702271A US300126A US30012652A US2702271A US 2702271 A US2702271 A US 2702271A US 300126 A US300126 A US 300126A US 30012652 A US30012652 A US 30012652A US 2702271 A US2702271 A US 2702271A
Authority
US
United States
Prior art keywords
gold
nitro
bath
deposition
hydrogen
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 - Lifetime
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US300126A
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English (en)
Inventor
Spreter Victor
Mermillod Jean
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Individual
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Individual
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Publication date
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Publication of US2702271A publication Critical patent/US2702271A/en
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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
    • 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
    • C25D3/48—Electroplating: Baths therefor from solutions of gold

Definitions

  • the noble metals are the most capable of retaining considerable quantifies of hydrogen.
  • the present invention comprises a process for the deposition of gold or gold alloys by electroplating, and a bath for carrying out said process, which permit of avoiding the drawbacks due to the production of hydrogen at the cathode, by preventing said hydrogen to be retained by the coating formed.
  • This process consists in passing, as in already known processes, an electric current through an aqueous bath containing in solution an alkaline aurocyanide, the object' to be plated being at the cathode. It is characterized by the use of a bath containing, in the dissolved state, a nitrated derivative of an aliphatic organic compound of low molecular weight.
  • the bath according to the invention consists of an aqueous solution containing an alkaline aurocyanide; it is characterized by the fact that it contains, in a dissolved state, a nitrated derivative of an aliphatic organic compound of low molecular weight, such, for instance, as nitro-guanidine and nitro-urea, which are particularly 2,702,271 Patented Feb. 15, '1955 suitable. Either may be used at a concentration of only 5 to 10 grams per litre of bath. It is then found that all the hydrogen produced at the cathode reacts with one or the other of these compounds.
  • the thick gold or gold alloy deposits thus obtained are flexible and ductile, free from internal stresses; they do not scale off or break, even when their thickness reaches several tens of microns. On the other hand, these deposits, if quickly heated to a temperature exceeding 400 C., do not deteriorate and blister.
  • Example 1 One prepares a gilding bath having the following composition:
  • the yield computed in relation to the current consumed, is about 35%
  • a bath according to claim 4 containing 5 to 10 grams per litre of the said nitro compound.

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)
US300126A 1952-04-28 1952-07-21 Process for the deposition of gold or gold alloys Expired - Lifetime US2702271A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH718573X 1952-04-28

Publications (1)

Publication Number Publication Date
US2702271A true US2702271A (en) 1955-02-15

Family

ID=4531336

Family Applications (1)

Application Number Title Priority Date Filing Date
US300126A Expired - Lifetime US2702271A (en) 1952-04-28 1952-07-21 Process for the deposition of gold or gold alloys

Country Status (5)

Country Link
US (1) US2702271A (de)
CH (1) CH286122A (de)
DE (1) DE923406C (de)
FR (1) FR1067619A (de)
GB (1) GB718573A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978390A (en) * 1957-07-22 1961-04-04 Bell Telephone Labor Inc Gold plating solutions
US3475290A (en) * 1965-05-07 1969-10-28 Suwa Seikosha Kk Bright gold plating solution and process
US3833488A (en) * 1971-08-20 1974-09-03 Auric Corp Gold electroplating baths and process
US3856638A (en) * 1971-08-20 1974-12-24 Auric Corp Bright gold electroplating bath and method of electroplating bright gold

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH615464A5 (en) * 1976-06-01 1980-01-31 Systemes Traitements Surfaces Special compositions and particular additives for gold electrolysis baths and their use

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903860A (en) * 1930-04-25 1933-04-18 Ig Farbenindustrie Ag Preparation of metallic coatings

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1903860A (en) * 1930-04-25 1933-04-18 Ig Farbenindustrie Ag Preparation of metallic coatings

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2978390A (en) * 1957-07-22 1961-04-04 Bell Telephone Labor Inc Gold plating solutions
US3475290A (en) * 1965-05-07 1969-10-28 Suwa Seikosha Kk Bright gold plating solution and process
US3833488A (en) * 1971-08-20 1974-09-03 Auric Corp Gold electroplating baths and process
US3856638A (en) * 1971-08-20 1974-12-24 Auric Corp Bright gold electroplating bath and method of electroplating bright gold

Also Published As

Publication number Publication date
FR1067619A (fr) 1954-06-17
GB718573A (en) 1954-11-17
DE923406C (de) 1955-02-10
CH286122A (fr) 1952-10-15

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