| 摘要 |
PROBLEM TO BE SOLVED: To provide a lead sinker which perfectly seals lead under the consideration of the affection of the lead on environments, can realize the high specific gravity of the lead, and can be produced at a low cost, and to provide a cast ion sinker whose corrosion with seawater can be prevented and which has high corrosion resistance. SOLUTION: This sinker is produced by forming the film of a highly anti-corrosive metal such as stainless steel, brass or tungsten on the surface of a lead or cast ion sinker. Thus, the sinker body produced from the lead, the cast iron, or the like is perfectly sealed in the inside of the sinker. COPYRIGHT: (C)2006,JPO&NCIPI
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