| 摘要 |
PURPOSE:To enhance the wear resistance of a rhodium plated substance assuming a black color and to further increase the blackness by passing the plated substance through an anodically electrolyzing process. CONSTITUTION:For example, brass is plated in a plating bath prepared by adding org. carboxylic acid, aromtatic acid or salts thereof to an ordinary acidic rhodium plating bath as an additive to form a rhodium coat assuming a black color, and the plated brass is passed through an anodically electrolyzing process. The electrolyte may be inorg. or org., and citric acid, glutamic acid, tartaric acid, acetic acid or the like is used as the bath electrolyte. |
