GB950941A - Improvements in or relating to chromium plating - Google Patents
Improvements in or relating to chromium platingInfo
- Publication number
- GB950941A GB950941A GB2143760A GB2143760A GB950941A GB 950941 A GB950941 A GB 950941A GB 2143760 A GB2143760 A GB 2143760A GB 2143760 A GB2143760 A GB 2143760A GB 950941 A GB950941 A GB 950941A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cro3
- moist
- pellets
- composition
- 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
- C25D21/00—Processes for servicing or operating cells for electrolytic coating
- C25D21/12—Process control or regulation
- C25D21/14—Controlled addition of electrolyte components
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Automation & Control Theory (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Treatment Of Metals (AREA)
- Electroplating And Plating Baths Therefor (AREA)
Abstract
Pellets for making up and maintaining chromic acid baths (see Division C7) are formed from a composition comprising predominantly moist CrO3, as chromic acid or anhydride, with or without a chromate, dichromate or polychromate of an alkali or alkaline earth metal e.g. Na, K, Mg, Sr or Ca, and/or SrSO4 and K2SiF6, to which may be added between 0.005 and 0.75% of an anti-misting agent such as a fluorinated hydrocarbon. Similar pellets for chromating baths comprise moist CrO3, a soluble nitrate and a soluble sulphate. U.S.A. Specifications 2,750,334, 2,750,335, 2,750,336, 2,750,337 and 2,846,380 are referred to.ALSO:Chromium is electrodeposited on a cathode from an electrolyte made up and maintained by adding pellets formed from a composition comprising predominantly moist CrO3, as chromic acid or anhydride with or without SrSO4 and K2SiF6, to which may be added between 0.005 and 0.75% of an anti-misting agent such as a fluorinated hydrocarbon. A chromate, dichromate or polychromate of an alkali metal such as Na or K, or alkaline earth metal such as Mg, Ca or Sr, may also be included in the composition. Also, chromate conversion coatings are produced on Cd or Zn by immersing the metal in an aqueous chromating solution made up and maintained by adding similar pellets formed from a composition comprising moist CrO3, a soluble nitrate and a soluble sulphate (excluding reducing agents), e.g. Na2SO4, NaHSO4, NaNO3, or H2SO4 and HNO3. For example, the solution may contain 65 g/l CrO3, 8 g/l H2SO4, 3.5 g/l HNO3 and 13 g/l acetic acid. Similar moist CrO3 containing pellets may be used for chromate anodizing baths. U.S.A. Specifications 2,750,334,2,750,335, 2,750,336, 2,750,337 and 2,846,380 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US82771459A | 1959-07-17 | 1959-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB950941A true GB950941A (en) | 1964-03-04 |
Family
ID=25249957
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2143760A Expired GB950941A (en) | 1959-07-17 | 1960-06-17 | Improvements in or relating to chromium plating |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB950941A (en) |
-
1960
- 1960-06-17 GB GB2143760A patent/GB950941A/en not_active Expired
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