GB812337A - Electrodeposition of chromium plate - Google Patents
Electrodeposition of chromium plateInfo
- Publication number
- GB812337A GB812337A GB22186/55A GB2218655A GB812337A GB 812337 A GB812337 A GB 812337A GB 22186/55 A GB22186/55 A GB 22186/55A GB 2218655 A GB2218655 A GB 2218655A GB 812337 A GB812337 A GB 812337A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cro
- concentration
- silicofluoride
- chromium
- amps
- 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)
- Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
- Catalysts (AREA)
Abstract
812,337. Electrodeposition of chromium. METAL & THERMIT CORPORATION. Aug. 2, 1955 [Aug. 12, 1954], No. 22186/55. Class 41. Crack-free chromium plate is electroplated on to a metal, e.g. steel, article at a cathode current density of 0.5 to 8 amps./square inch at a temperature of 140 F. to the boiling point of the electrolytic bath which comprises 300 g./1. CrO 3 , strontium sulphate and sodium or potassium silicofluoride in excess of their bath solubility and a soluble non-catalytic compound of the same cation as the silicofluoride to suppress the concentration thereof so that the sum of the dissolved sulphate and silicofluoride radicals is from 2.5 to 10.5 g./l. and varies with CrO 3 concentration as defined by the area ABCD in the accompanying graph. The area JKLM indicates a preferred operating range for which the current density is 1 to 3 amps./square inch and the temperature is 145 to 160 F. Part of the CrO 3 concentration may be provided by the addition of non-catalytic chromium compounds such as sodium and potassium chromates and dichromates. The deposits are readily buffable. Specifications 697,786, 711,468, 771,925 and 812,338 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US449378A US2787588A (en) | 1954-08-12 | 1954-08-12 | Chromium plating |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB812337A true GB812337A (en) | 1959-04-22 |
Family
ID=23783937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB22186/55A Expired GB812337A (en) | 1954-08-12 | 1955-08-02 | Electrodeposition of chromium plate |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2787588A (en) |
| DE (1) | DE1044550B (en) |
| FR (1) | FR1129375A (en) |
| GB (1) | GB812337A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2916424A (en) * | 1957-11-07 | 1959-12-08 | Metal & Thermit Corp | Process for chromium plating |
| US2950234A (en) * | 1958-02-26 | 1960-08-23 | Metal & Thermit Corp | Chromium plating process and bath |
| GB946958A (en) * | 1961-07-26 | 1964-01-15 | Nat Res Dev | A method of and an apparatus for the electrolytic production of chromium of a high degree of purity |
| US3303113A (en) * | 1963-10-18 | 1967-02-07 | Udylite Corp | Chromium plating |
| US3303114A (en) * | 1964-01-10 | 1967-02-07 | Udylite Corp | Chromium plating |
| US3334033A (en) * | 1964-09-11 | 1967-08-01 | Udylite Corp | Chromium plating |
| US3749652A (en) * | 1972-02-10 | 1973-07-31 | Norton Co | Crack-free hard chrome |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2469015A (en) * | 1943-02-20 | 1949-05-03 | United Chromium Inc | Method and compositions for producing surface conversion coatings on zinc |
| US2499231A (en) * | 1944-08-25 | 1950-02-28 | United Chromium Inc | Method of producing surface conversion coatings on zinc |
| BE517665A (en) * | 1949-11-23 | |||
| US2640022A (en) * | 1950-11-07 | 1953-05-26 | United Chromium Inc | Composition, bath, and process for chromium plating |
| US2686756A (en) * | 1953-05-20 | 1954-08-17 | United Chromium Inc | Chromium plating |
-
1954
- 1954-08-12 US US449378A patent/US2787588A/en not_active Expired - Lifetime
-
1955
- 1955-08-02 GB GB22186/55A patent/GB812337A/en not_active Expired
- 1955-08-08 DE DEU3457A patent/DE1044550B/en active Pending
- 1955-08-11 FR FR1129375D patent/FR1129375A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR1129375A (en) | 1957-01-21 |
| DE1044550B (en) | 1958-11-20 |
| US2787588A (en) | 1957-04-02 |
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