GB622750A - Improvements in or relating to the electrolytic polishing of silver - Google Patents
Improvements in or relating to the electrolytic polishing of silverInfo
- Publication number
- GB622750A GB622750A GB29509/46A GB2950946A GB622750A GB 622750 A GB622750 A GB 622750A GB 29509/46 A GB29509/46 A GB 29509/46A GB 2950946 A GB2950946 A GB 2950946A GB 622750 A GB622750 A GB 622750A
- Authority
- GB
- United Kingdom
- Prior art keywords
- silver
- anode
- current
- article
- time
- 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
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
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)
Abstract
622,750. Electrolytic polishing of silver surfaces. WESTINGHOUSE ELECTRIC INTERNATIONAL CO. Oct. 3, 1946, No. 29509. Convention date, July 20, 1945. [Class 41] Surfaces of articles composed of silver or alloys having such a predominant amount of silver as to simulate pure silver in appearance and polish are polished by immersing the article in an alkaline aqueous electrolyte containing at least 5 grams/litre of silver cyanide and at least 5 grams/litre of free alkali metal cyanide and passing a periodically reversing current through the article while immersed in the electrolyte, the anode current through the article being not less than 30 amps/sq. ft. and increasing inversely to the anode time of the cycle, and the cathode current is so proportioned to the anode current that the product of cathode time and cathode current substantially equals the product of anode time and anode current. The electrolyte may also contain an alkali metal carbonate and an alkali metal hydroxide and should have a pH of 10 or higher. For any given value of the anode time, the anode current density should lie above the curve shown in Fig. 3. The polishing process may succeed the silver plating process in a cyanide bath utilizing the same bath.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US622750XA | 1945-07-20 | 1945-07-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB622750A true GB622750A (en) | 1949-05-06 |
Family
ID=22041404
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB29509/46A Expired GB622750A (en) | 1945-07-20 | 1946-10-03 | Improvements in or relating to the electrolytic polishing of silver |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE469082A (en) |
| FR (1) | FR938696A (en) |
| GB (1) | GB622750A (en) |
-
0
- BE BE469082D patent/BE469082A/xx unknown
-
1946
- 1946-10-03 GB GB29509/46A patent/GB622750A/en not_active Expired
- 1946-10-24 FR FR938696D patent/FR938696A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR938696A (en) | 1948-10-21 |
| BE469082A (en) |
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