Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Year | Description |
| 1995 | Invention patented by Hitoshi Sakurai, Seiji Kishikawa, Tomitaka Yamamoto, and Tadahiro Itoh on November 21th, 1995. Abstract: 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. |
| Source: selected by the editor from original sources. | |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
