JPS5471048A - Black chrome plating bath - Google Patents
Black chrome plating bathInfo
- Publication number
- JPS5471048A JPS5471048A JP13723877A JP13723877A JPS5471048A JP S5471048 A JPS5471048 A JP S5471048A JP 13723877 A JP13723877 A JP 13723877A JP 13723877 A JP13723877 A JP 13723877A JP S5471048 A JPS5471048 A JP S5471048A
- Authority
- JP
- Japan
- Prior art keywords
- plating
- acid
- silicofluovide
- current density
- compound
- 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.)
- Granted
Links
Landscapes
- Electroplating And Plating Baths Therefor (AREA)
Abstract
PURPOSE: To obtain an excellent plating covering a wide temperature range and a wide current density range by adding of an alkali and silicofluoric acid or a silicofluovide compound and nitric acid to a plating both at a proper ratio.
CONSTITUTION: A black chrome plating liquid is prepared containing 200 to 700 g per 1l of chromic and anhydride which does not contain sulfuric acid, 10 to 100 g of alkali (sodium hydroxide), 0.2 to 1.5 g of a silicofluovide acid or silicofluovide compound, 0.5 to 10 g of nitric acid or nitrate. The addition of slilcofluovide acid or silicofluovide compound to the plating bath can facilitate the separation of chrome oxide thereby expanding the current density range of producing black plating. This allows production of a black plating at a normal temperature at a cathode current density 2 to 3A/dm2. Thus, a high current efficiency of about 10 percent is available at a chathode current density of 30 to 40A/cm2. In addition, the current efficiency increases with the increase in the electrolysis time.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13723877A JPS585998B2 (en) | 1977-11-17 | 1977-11-17 | Black chrome plating liquid |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13723877A JPS585998B2 (en) | 1977-11-17 | 1977-11-17 | Black chrome plating liquid |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5471048A true JPS5471048A (en) | 1979-06-07 |
JPS585998B2 JPS585998B2 (en) | 1983-02-02 |
Family
ID=15193993
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13723877A Expired JPS585998B2 (en) | 1977-11-17 | 1977-11-17 | Black chrome plating liquid |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS585998B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4406756A (en) * | 1981-07-13 | 1983-09-27 | Canadian Corporate Management Company Limited | Hard chromium plating from hexavalent plating bath |
EP1466679A2 (en) * | 2003-04-01 | 2004-10-13 | Toyota Jidosha Kabushiki Kaisha | Press molding die and manufacturing method of same |
-
1977
- 1977-11-17 JP JP13723877A patent/JPS585998B2/en not_active Expired
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4406756A (en) * | 1981-07-13 | 1983-09-27 | Canadian Corporate Management Company Limited | Hard chromium plating from hexavalent plating bath |
EP1466679A2 (en) * | 2003-04-01 | 2004-10-13 | Toyota Jidosha Kabushiki Kaisha | Press molding die and manufacturing method of same |
EP1466679A3 (en) * | 2003-04-01 | 2005-06-22 | Toyota Jidosha Kabushiki Kaisha | Press molding die and manufacturing method of same |
US7340934B2 (en) | 2003-04-01 | 2008-03-11 | Toyota Jidosha Kabushiki Kaisha | Press molding die and manufacturing method of same |
Also Published As
Publication number | Publication date |
---|---|
JPS585998B2 (en) | 1983-02-02 |
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