发明名称 |
Solution and process for black chromating |
摘要 |
A chemically stable black chromate solution capable of forming an anticorrosive black chromate film on a Zn-Ni alloy plating is provided, the components being easily soluble in the solution. The black chromate solution comprises 1 to 50 g/l of hexavalent chromium; 1 to 50 g/l of sulfate ion; 0.05 to 1.0 g/l of soluble silver; 0.5 to 100 g/l of a sulfonated carboxylic acid selected from the group consisting of sulfo-aromatic carboxylic acids having 7 to 15 carbon atoms, sulfonated aliphatic dicarboxylic acids having 3 to 10 carbon atoms and salts thereof; and a balance of water, the solution having a pH of 0.5 to 2.5. |
申请公布号 |
EP0805222(A1) |
申请公布日期 |
1997.11.05 |
申请号 |
EP19960303068 |
申请日期 |
1996.05.01 |
申请人 |
DIPSOL CHEMICALS CO., LTD. |
发明人 |
SAKURAI, HITOSHI;KISHIKAWA, SEIJI;YAMAMOTO, TOMITAKA;ITOH, TADAHIRO |
分类号 |
C23C22/27 |
主分类号 |
C23C22/27 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|