GB723945A - An electrolytic process for smoothing and polishing surfaces of gold and gold alloys - Google Patents

An electrolytic process for smoothing and polishing surfaces of gold and gold alloys

Info

Publication number
GB723945A
GB723945A GB22435/52A GB2243552A GB723945A GB 723945 A GB723945 A GB 723945A GB 22435/52 A GB22435/52 A GB 22435/52A GB 2243552 A GB2243552 A GB 2243552A GB 723945 A GB723945 A GB 723945A
Authority
GB
United Kingdom
Prior art keywords
gold
thiourea
acid
smoothing
polishing
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
GB22435/52A
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.)
Evonik Operations GmbH
Original Assignee
Degussa GmbH
Deutsche Gold und Silber Scheideanstalt
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 Degussa GmbH, Deutsche Gold und Silber Scheideanstalt filed Critical Degussa GmbH
Publication of GB723945A publication Critical patent/GB723945A/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
    • C25F3/00—Electrolytic etching or polishing
    • C25F3/16—Polishing
    • C25F3/22—Polishing of heavy metals

Abstract

723,945. Electro-polishing gold and gold alloys. DEUTSCHE GOLDUND SILBERSCHEIDEANSTALT VORM ROESSLER. Sept. 5, 1952 [Sept. 20, 1951], No. 22435/52. Class 41. In an electrolytic process for smoothing and polishing the surface of a body of gold or gold alloy of a fineness of at least 333 parts in 1000 parts, the body is subjected to anodic treatment in an acid thiourea solution containing at least 5 gm. of free thiourea per litre at a temperature of up to 100‹ C., preferably 30‹ to 60‹ C., using an anodic current density which promotes the temporary formation of a surface layer coating the anode. The solution preferably contains 15 to 60 gms. of thiourea per litre, and may be acidified with inorganic acids, particularly sulphuric acid, or organic acids such as tartaric acid, or with acid salts or mixtures of acid salts with one another or with acids. The solution may also contain antipyrine to increase the solubility of the thiourea.
GB22435/52A 1951-09-20 1952-09-05 An electrolytic process for smoothing and polishing surfaces of gold and gold alloys Expired GB723945A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE313570X 1951-09-20

Publications (1)

Publication Number Publication Date
GB723945A true GB723945A (en) 1955-02-16

Family

ID=6141223

Family Applications (1)

Application Number Title Priority Date Filing Date
GB22435/52A Expired GB723945A (en) 1951-09-20 1952-09-05 An electrolytic process for smoothing and polishing surfaces of gold and gold alloys

Country Status (3)

Country Link
US (1) US2712524A (en)
CH (1) CH313570A (en)
GB (1) GB723945A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907258A (en) * 2019-12-30 2020-03-24 昆山全亚冠环保科技有限公司 Gold metallographic electrolytic corrosion method

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4686017A (en) * 1981-11-05 1987-08-11 Union Oil Co. Of California Electrolytic bath and methods of use
US4801511A (en) * 1985-06-28 1989-01-31 Union Oil Company Of California Battery cell electrolyte
US4755265A (en) * 1985-06-28 1988-07-05 Union Oil Company Of California Processes for the deposition or removal of metals
RU2467082C1 (en) * 2011-03-29 2012-11-20 Федеральное государственное бюджетное учреждение науки Институт неорганической химии им. А.В. Николаева Сибирского отделения Российской академии наук Method of electrochemical extraction of silver from silver-bearing current-conducting wastes
RU2516180C1 (en) * 2012-11-26 2014-05-20 Владимир Семенович Сонькин Method to process alloy of ligature gold

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2334698A (en) * 1938-07-09 1943-11-23 Battelle Memorial Institute Polished metal and a method of making the same
US2335354A (en) * 1939-02-06 1943-11-30 Rustless Iron & Steel Corp Polishing stainless iron and steel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110907258A (en) * 2019-12-30 2020-03-24 昆山全亚冠环保科技有限公司 Gold metallographic electrolytic corrosion method

Also Published As

Publication number Publication date
US2712524A (en) 1955-07-05
CH313570A (en) 1956-04-30

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