| 摘要 |
PURPOSE:To obtain the excellent characteristic in the deteriorated environment at a low cost by forming ruthenium or an alloy mainly made of ruthenium and a metal in sequence on a base metal directly or via nickel or an alloy mainly made of nickel. CONSTITUTION:A layer 2 of nickel or an alloy mainly made of nickel is formed on a base metal 1. A layer 3 of ruthenium or an alloy mainly made of ruthenium is formed on the layer 2 of nickel or an alloy mainly made of nickel, a gold layer 4 is formed on it. The electrolytic or electroless plating method is used to form them. |
