| 摘要 |
PURPOSE:To improve corrosion resistance and mold release property of a die with respect to rubber by layering in sequence Ni film, NiP film, and NiSn film at a part with which rubber in a rubber molding die comes in contact. CONSTITUTION:On a metal surface from which oxide film is removed, an Ni film having a thickness of 1-10mum is formed by ordinary electric plating. For a second layer, an NiP film of 1mum or above is formed by electroless plating. For a third layer, an NiSn film having excellent corrosion resistance and mold release property with a thickness of 1-50mum is formed by the electric plating. Thereafter, it is treated with heat for raising the hardness. In this die, the whole film holds a high adhesion to a parent material by the Ni film, the NiP film heightens the adhesion to the Ni film and holds the hardness of the NiSn film of the third layer. |
