GB1106816A - Improvements in or relating to chromium electro-plating - Google Patents
Improvements in or relating to chromium electro-platingInfo
- Publication number
- GB1106816A GB1106816A GB2242265A GB2242265A GB1106816A GB 1106816 A GB1106816 A GB 1106816A GB 2242265 A GB2242265 A GB 2242265A GB 2242265 A GB2242265 A GB 2242265A GB 1106816 A GB1106816 A GB 1106816A
- Authority
- GB
- United Kingdom
- Prior art keywords
- dissolved
- ion
- chromium
- selenate
- plating
- 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)
- Electroplating Methods And Accessories (AREA)
Abstract
Micro-cracked chromium plate, i.e. plate having at least 750 cracks per lineal inch, is formed by electro-depositing chromium for a sufficient period until internal stress of the deposit causes cracking using a cathode C.D. of from 20 to 1500 amps./sq.ft. and an aqueous bath at a temperature of 90 to 115 DEG F. and comprising less than 250 g/l of dissolved CrO3, dissolved sulphate ion, dissolved fluoride ion, and dissolved selenate ion. Preferably the bath contains 0.1 to 2.5 g/l sulphate ion, sufficient simple or complex fluoride ion to give a dissolved fluorine content of 0.01 to 3 g/l, and 0.007 to 0.1 g/1 of dissolved selenate ion. Typically the fluorine content is supplied as hydrofluoric, hydrofluosilicic or fluoboric acids or their sodium salts, or the reduced reaction product of hexavalent chromium and either hydrofluosilicic acid or hydrofluoric acid and silica as in Specification 829,429; or by fluoaluminates, fluotitanates or fluozirconates while the selenate ion is supplied as Na2SeO4. A plating of 0.025 to 0.1 mm may be obtained.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US37109664A | 1964-05-28 | 1964-05-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1106816A true GB1106816A (en) | 1968-03-20 |
Family
ID=23462458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2242265A Expired GB1106816A (en) | 1964-05-28 | 1965-05-26 | Improvements in or relating to chromium electro-plating |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1496774A1 (en) |
| FR (1) | FR1442615A (en) |
| GB (1) | GB1106816A (en) |
-
1965
- 1965-05-26 FR FR18575A patent/FR1442615A/en not_active Expired
- 1965-05-26 GB GB2242265A patent/GB1106816A/en not_active Expired
- 1965-05-28 DE DE1965S0047386 patent/DE1496774A1/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DE1496774A1 (en) | 1969-08-07 |
| FR1442615A (en) | 1966-06-17 |
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