| abstract |
(57) [Summary] [Structure] In a solder paste having a solder alloy powder containing zinc, the surface of the powder particles of the solder alloy was coated with a rust inhibitor or another metal. Gold, silver, tin, palladium, etc. are used as the coating metal, As the rust preventive, an imidazole type or a triazole type is suitable. [Effect] According to the present invention, it is possible to prevent the powder particles of the zinc-containing solder from reacting with the activator in the flux, so that the solder paste has good solderability and excellent storage stability. |