GB274882A - Process for the electrolytic separation of metallic chromium for the preparation of chromium coatings on other metals - Google Patents
Process for the electrolytic separation of metallic chromium for the preparation of chromium coatings on other metalsInfo
- Publication number
- GB274882A GB274882A GB19293/27A GB1929327A GB274882A GB 274882 A GB274882 A GB 274882A GB 19293/27 A GB19293/27 A GB 19293/27A GB 1929327 A GB1929327 A GB 1929327A GB 274882 A GB274882 A GB 274882A
- Authority
- GB
- United Kingdom
- Prior art keywords
- chromium
- added
- per
- gms
- chromate
- 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
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
274,882. Appel, R. July 21, 1926, [Convention date]. Chromium, depositing.-The electrolyte consists of chromic acid, or an acidified solution of a chromate, to which is added one or more borates or iodates in amount not exceeding 0.5 gms. per litre. Anodes of sheet lead are employed. Sulphuric acid is preferably used as acidifying agent when a chromate is used as electrolyte, and is also added to chromic acid when not already present therein. In an example the electrolyte consists of a solution containing 5 per cent CrO3 or an equivalent solution of acidified potassium bichro. mate, and about 0.5 gms. per litre or less of sodium pyroborate Na2B4O7, or of sodium or potassium iodate. Electrolysis is carried out at 35-40‹ C., with a voltage 3-4, and current density 0.6 amps per sq. cm. These values may be varied, however, according to the nature of the deposit required; for example, a brownish-black coating is obtained at 10-25‹ C. The correct acidity is ascertained by a preliminary trial; if brown oxides are separated at the cathode, more sulphuric acid is added. Specifications 259,118 and 265,833 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE274882X | 1926-07-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB274882A true GB274882A (en) | 1927-12-01 |
Family
ID=6022729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB19293/27A Expired GB274882A (en) | 1926-07-21 | 1927-07-20 | Process for the electrolytic separation of metallic chromium for the preparation of chromium coatings on other metals |
Country Status (3)
| Country | Link |
|---|---|
| FR (1) | FR678157A (en) |
| GB (1) | GB274882A (en) |
| NL (1) | NL23685C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177640A (en) * | 2015-08-04 | 2015-12-23 | 重庆立道表面技术有限公司 | Efficient high-performance and high-hardness chromium plating process |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2423556A1 (en) * | 1978-03-08 | 1979-11-16 | Yissum Res Dev Co | PROCESS FOR ELECTROLYTIC CHROME COATING ON VARIOUS METALS AND BATHS USED FOR THIS PURPOSE |
| US4472249A (en) * | 1981-08-24 | 1984-09-18 | M&T Chemicals Inc. | Bright chromium plating baths and process |
-
0
- NL NL23685D patent/NL23685C/xx active
-
1927
- 1927-07-20 GB GB19293/27A patent/GB274882A/en not_active Expired
- 1927-07-20 FR FR678157D patent/FR678157A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105177640A (en) * | 2015-08-04 | 2015-12-23 | 重庆立道表面技术有限公司 | Efficient high-performance and high-hardness chromium plating process |
Also Published As
| Publication number | Publication date |
|---|---|
| FR678157A (en) | 1930-03-19 |
| NL23685C (en) |
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