GB981481A - Improvements in or relating to electroplating - Google Patents
Improvements in or relating to electroplatingInfo
- Publication number
- GB981481A GB981481A GB30990/61A GB3099061A GB981481A GB 981481 A GB981481 A GB 981481A GB 30990/61 A GB30990/61 A GB 30990/61A GB 3099061 A GB3099061 A GB 3099061A GB 981481 A GB981481 A GB 981481A
- Authority
- GB
- United Kingdom
- Prior art keywords
- litre
- moles
- acid
- bath
- chromium
- 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
- 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
- C25D3/04—Electroplating: Baths therefor from solutions of chromium
- C25D3/10—Electroplating: Baths therefor from solutions of chromium characterised by the organic bath constituents used
Abstract
An aqueous bath for electrodeposition of bright chromium plate comprises: divalent chromium salt 0.1-2 gm. moles/litre; formic acid and/or glycollic acid 0.3-1 gm. moles/litre; alkali metal salt of formic acid, glycollic acid or an acid 0.3-4 gm. moles/litre having a dissociation constant of at least 1X10-2 (e.g. HCl or H2SO4); and has a pH of 1.7-4.5. In preferred solutions boric acid is added (0-3 gm. moles/litre) with a fluoride (0-5 gm. moles/litre). The bath may be operated at room temperature up to 90 DEG C., at 20-450 amps/sq.ft. with an inert anode (e.g. carbon or graphite) and a metallic cathode. An inert gas blanket may be maintained above the bath to inhibit oxidation of the Cr++ compounds, and a wetting agent may be added to promote frothing which has a similar protective effect. The chromium may be plated on brass which can then be removed with nitric acid to give a high tensile strength foil. The foil may be baked, before or after the removal of the brass, at a temperature of 200-350 DEG C. for a period of from a few seconds up to one hour. U.S.A. Specifications 2,823,095, 2,996,353 and 3,088,801 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US126623A US3069333A (en) | 1961-07-25 | 1961-07-25 | Chromium plating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB981481A true GB981481A (en) | 1965-01-27 |
Family
ID=22425850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB30990/61A Expired GB981481A (en) | 1961-07-25 | 1961-08-28 | Improvements in or relating to electroplating |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3069333A (en) |
| BE (1) | BE625233A (en) |
| DE (1) | DE1247801B (en) |
| FR (1) | FR1309239A (en) |
| GB (1) | GB981481A (en) |
| NL (2) | NL268828A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1247803C2 (en) * | 1959-10-07 | 1973-03-29 | Du Pont | PROCESS FOR MANUFACTURING SELF-SUPPORTING METAL COMPOSITE FALMS BY DEPOSITING GALVANISCLES |
| GB1289117A (en) * | 1969-10-10 | 1972-09-13 | ||
| US4690735A (en) * | 1986-02-04 | 1987-09-01 | University Of Florida | Electrolytic bath compositions and method for electrodeposition of amorphous chromium |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1922853A (en) * | 1927-12-01 | 1933-08-15 | United Chromium Inc | Process for the electrolytic deposition of chromium |
| US1838777A (en) * | 1928-03-26 | 1931-12-29 | Ternstedt Mfg Co | Chromium plating |
| FR754360A (en) * | 1929-10-16 | 1933-11-03 |
-
0
- NL NL132271D patent/NL132271C/xx active
- BE BE625233D patent/BE625233A/xx unknown
- NL NL268828D patent/NL268828A/xx unknown
-
1961
- 1961-07-25 US US126623A patent/US3069333A/en not_active Expired - Lifetime
- 1961-08-28 GB GB30990/61A patent/GB981481A/en not_active Expired
- 1961-08-31 FR FR872068A patent/FR1309239A/en not_active Expired
- 1961-08-31 DE DEP27799A patent/DE1247801B/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| BE625233A (en) | |
| NL132271C (en) | |
| NL268828A (en) | |
| US3069333A (en) | 1962-12-18 |
| FR1309239A (en) | 1962-11-16 |
| DE1247801B (en) | 1967-08-17 |
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