REFLOWED SOLDER PLATED SQUARE WIRE AND ITS PRODUCTION

摘要

PURPOSE: To obtain a reflowed solder plated square wire excellent in corrosion resistance, solderability, bendability and wear resistance. ;CONSTITUTION: When b square Cu or Cu alloy wire electroplated with an Sn-Pb alloy solder layer is subjected to prescribed reflowing treatment to obtain a reflowed solder plated square wire, the Snob Pb alloy-solder layer is made of a polycrystalline body of Snwith Pb 1 deposited on grain boundaries. Since the crystal structure of the solder plating layer is made of a polycrystalline body of Sn with Pb deposited on grain boundaries and bonding between grains is strengthened, the effect of a Cu-Sn compd. layer formed by the reflowing treatment on bendability, solderability and wear resistance is eliminated.;COPYRIGHT: (C)1995,JPO