SOLDER PASTE HAVING BLACKENING PREVENTIVE EFFECT, AND LEAD-FREE SOLDER BLACKENING PREVENTIVE METHOD

摘要

PROBLEM TO BE SOLVED: To solve a problem that if resin-based flux containing organic halide is contained in a lead-free solder employed through lead-free solder, a soldered portion is secularly discolored black and advanced to the inside of the solder, resulting in separation of the soldered portion or degradation of the conductivity of the solder.;SOLUTION: When using flux containing organic halide in soldering a lead-free solder, phosphor compound is added to the flux containing the organic halide, or phosphor is added to lead-free solder powder to be used, and the reaction of halogen remaining in flux residue after the soldering can be suppressed thereby.;COPYRIGHT: (C)2011,JPO&INPIT