| 摘要 |
PURPOSE:To provide a tension member having excellent characteristics with a decreased transmission loss by providing a nickel or nickel alloy plating layer as a lower layer to provide a rust preventive effect on various metallic wires and subjecting the upper layer to copper plating or copper alloy plating without the generation of gaseous hydrogen. CONSTITUTION:The tension member 10 for an optical fiber cable is formed by using a metallic wire such as steel wire, stainless steel wire or aluminum wire as a strand 11 to provide the strength as the tension member thereto and providing the lower layer 12 consisting of the nickel or nickel alloy plating layer to prevent oxidation thereon and the copper or copper alloy plating layer to prevent the generation of the gaseous hydrogen on the upper layer 13. Silver, platinum, gold, etc. are usable as well in addition to copper having the potential baser than hydrogen to prevent the generation of the gaseous hydrogen by the electrochemical reaction of water and metal. The nickel or nickel alloy plating layer is provided as the lower layer because the electrode potential difference at the metallic boundary is smaller and the tendency to corrosion is less with the nickel-plated steel than with the copper-plated steel.
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