| 摘要 |
A method of preventing the natural oxidization of the lead surface and developing the tensile stress is speciallized that a lead is coated with the Sn-Pb mixed alloy(50 to 50) around the lead(1) of cu or Cu alloy to increase the selfmalleability and coated afterwards with 100 % pure Sn(3) having 1-2 μm depth on the surface(2) to prevent from exposing an easily oxidizable Pb in the air.
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