US3156635A - Gold plating - Google Patents

Gold plating Download PDF

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Publication number
US3156635A
US3156635A US133301A US13330161A US3156635A US 3156635 A US3156635 A US 3156635A US 133301 A US133301 A US 133301A US 13330161 A US13330161 A US 13330161A US 3156635 A US3156635 A US 3156635A
Authority
US
United States
Prior art keywords
gold
hydrazine
bath
cyanide
alkali
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
Application number
US133301A
Other languages
English (en)
Inventor
Foulke Donald Gardner
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.)
Occidental Chemical Corp
Sel Rex Corp
Original Assignee
Sel Rex 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
Priority to BE620596D priority Critical patent/BE620596A/xx
Application filed by Sel Rex Corp filed Critical Sel Rex Corp
Priority to US133301A priority patent/US3156635A/en
Priority to GB2261/62A priority patent/GB928087A/en
Priority to DES77933A priority patent/DE1215467B/de
Priority to CH872662A priority patent/CH399863A/fr
Priority to FR906617A priority patent/FR1331064A/fr
Application granted granted Critical
Publication of US3156635A publication Critical patent/US3156635A/en
Anticipated expiration legal-status Critical
Assigned to OXY METAL INDUSTRIES CORPORATION reassignment OXY METAL INDUSTRIES CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). 4-09-74 Assignors: OXY METAL FINISHING CORPORATION
Assigned to HOOKER CHEMICALS & PLASTICS CORP. reassignment HOOKER CHEMICALS & PLASTICS CORP. MERGER (SEE DOCUMENT FOR DETAILS). Assignors: OXY METAL INDUSTRIES CORPORATION
Assigned to OCCIDENTAL CHEMICAL CORPORATION reassignment OCCIDENTAL CHEMICAL CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE MARCH 30, 1982. Assignors: HOOKER CHEMICAS & PLASTICS CORP.
Expired - Lifetime 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
    • C25D3/48—Electroplating: Baths therefor from solutions of gold

Definitions

  • This invention is based on the discovery that it is possible to obtain 24-carat gold deposits essentially free of organic inclusions by employing a gold bath containing potassium gold cyanide and conducting salts consisting of phosphates or phosphites adjusted to a pH of 36. Gold deposition from such solutions proceeds at an efficiency of less than 100 percent resulting in some loss of hydrogen with the result that the phosphorous acidphosphite solution is somewhat more suitable from a buffer standpoint. Polyphosphoric acids may also be used although they gradually convert to orthophosphate.
  • the deposits obtained from this solution are not bright, being yellow matte to semi-bright, but they are smooth and of high purity.
  • An object of this invention is to provide an acid gold plating bath which is low in organic material so that there is little tendency to codeposit organic compounds with gold.
  • a second object of this invention is to provide a gold plating bath which is low in cyanide, thereby minimizing the tendency to build up a concentration of cyanide break-down products in the bath. Obviously, some alkali cyanide will develop in the bath over a period of time, but at a pH of 36 the concentration is maintained at a low value. However, I have found that the introduction of hydrazine or substituted hydrazines tends to prevent this cyanide build-up and to provide improved electrodeposits.
  • the hydrazine compounds which may be employed are comprised of the water soluble hydrazine salts which is the sulfate, N H .H SO the hydrochloride, N H .2HCl, etc., the water soluble organic hydrazine, hydrazono, and hydrazo compounds, etc. Approximately /2 to 20 g./l. of the hydrazine or hydrazine compound are satisfactory in preventing the build-up of cyanide products.
  • the gold content of the bath is not very critical but very satisfactory deposits are obtained with from 4 to 36 g./l. of soluble gold salt.
  • the phosphate or phosphite anions are present in the bath in the proportion of about 5 to 200 g./l.
  • the phosphate and phosphate anions may be added to the bath as acids in which case, the pH is adjusted to the range of 36 by the addition of alkali.
  • Example 1 A bath of the following composition was prepared:
  • Example 2 A bath was made up as follows:
  • Brass panels plated in this bath were similar in appearance to those obtained from the phosphoric acid phosphate bath.
  • the addition of methyl hydrazine in one case and dimethyl hydrazine in another case gave brighter deposits.
  • Potassium phosphite could be substituted for the equivalent amount of KOH and phosphorous acid to make this bath.
  • Example 3 A bath was made up according to Example 1, except that only 2 g./l. of gold (as sodium gold cyanide) were added. Satisfactory deposits were obtained up to 0.6 amp/dm. Increasing the phosphate content to 200 g./l. had no observable effect on the deposit, but the voltage drop across the cell was lowered.
  • gold sodium gold cyanide
  • Example 4 A bath was prepared as follows:
  • a plating solution for plating approximately 24k 15 selected from the group consisting of phosphoric, phosphorous and polyphosphoric acid anions,
  • a plating solution as claimed in claim 4 comprising 1 to 10 g./l. of hydrazine sulfate.

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)
US133301A 1961-08-23 1961-08-23 Gold plating Expired - Lifetime US3156635A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
BE620596D BE620596A (en, 2012) 1961-08-23
US133301A US3156635A (en) 1961-08-23 1961-08-23 Gold plating
GB2261/62A GB928087A (en) 1961-08-23 1962-01-22 Gold plating
DES77933A DE1215467B (de) 1961-08-23 1962-02-07 Bad zum galvanischen Abscheiden 24karaetiger Goldueberzuege
CH872662A CH399863A (fr) 1961-08-23 1962-07-19 Procédé pour le dépôt électrolytique d'or et électrolyte pour la mise en oeuvre de ce procédé
FR906617A FR1331064A (fr) 1961-08-23 1962-08-09 Procédé pour le dépôt électrolytique d'or et électrolyte pour la mise en oeuvre de ce procédé

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US133301A US3156635A (en) 1961-08-23 1961-08-23 Gold plating

Publications (1)

Publication Number Publication Date
US3156635A true US3156635A (en) 1964-11-10

Family

ID=22457931

Family Applications (1)

Application Number Title Priority Date Filing Date
US133301A Expired - Lifetime US3156635A (en) 1961-08-23 1961-08-23 Gold plating

Country Status (5)

Country Link
US (1) US3156635A (en, 2012)
BE (1) BE620596A (en, 2012)
CH (1) CH399863A (en, 2012)
DE (1) DE1215467B (en, 2012)
GB (1) GB928087A (en, 2012)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3445352A (en) * 1966-09-23 1969-05-20 Western Electric Co Gold electroplating process and solution
DE2001497B2 (de) 1969-01-15 1973-01-04 Pmd Chemicals Ltd., Coventry, Warwickshire (Grossbritannien) Verfahren zur Herstellung eines wäßrigen, galvanischen Goldbades

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4207149A (en) * 1974-12-04 1980-06-10 Engelhard Minerals & Chemicals Corporation Gold electroplating solutions and processes

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176668A (en) * 1938-02-10 1939-10-17 Int Silver Co Silver plating process
US2654702A (en) * 1948-09-03 1953-10-06 Dow Chemical Co Electrodepostion of metal from alkaline cyanide bath
US2812299A (en) * 1949-05-05 1957-11-05 Birle & Co K G Electrolytic deposition of gold and gold alloys
US2978390A (en) * 1957-07-22 1961-04-04 Bell Telephone Labor Inc Gold plating solutions

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2176668A (en) * 1938-02-10 1939-10-17 Int Silver Co Silver plating process
US2654702A (en) * 1948-09-03 1953-10-06 Dow Chemical Co Electrodepostion of metal from alkaline cyanide bath
US2812299A (en) * 1949-05-05 1957-11-05 Birle & Co K G Electrolytic deposition of gold and gold alloys
US2978390A (en) * 1957-07-22 1961-04-04 Bell Telephone Labor Inc Gold plating solutions

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3445352A (en) * 1966-09-23 1969-05-20 Western Electric Co Gold electroplating process and solution
DE2001497B2 (de) 1969-01-15 1973-01-04 Pmd Chemicals Ltd., Coventry, Warwickshire (Grossbritannien) Verfahren zur Herstellung eines wäßrigen, galvanischen Goldbades

Also Published As

Publication number Publication date
DE1215467B (de) 1966-04-28
BE620596A (en, 2012)
CH399863A (fr) 1965-09-30
GB928087A (en) 1963-06-06

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Legal Events

Date Code Title Description
AS Assignment

Owner name: OXY METAL INDUSTRIES CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:OXY METAL FINISHING CORPORATION;REEL/FRAME:003967/0084

Effective date: 19741220

AS Assignment

Owner name: HOOKER CHEMICALS & PLASTICS CORP.

Free format text: MERGER;ASSIGNOR:OXY METAL INDUSTRIES CORPORATION;REEL/FRAME:004075/0885

Effective date: 19801222

AS Assignment

Owner name: OCCIDENTAL CHEMICAL CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:HOOKER CHEMICAS & PLASTICS CORP.;REEL/FRAME:004126/0054

Effective date: 19820330