WHISKER PREVENTIVE AGENT FOR TIN OR TIN ALLOY PLATING, AND METHOD OF WHISKER PREVENTION MAKING USE OF THE SAME

摘要

Simple means for unfailing prevention of whisker occurrence even when leaving is made at room temperature for 5000 hr after tin or tin alloy plating. There is provided a whisker preventive agent for tin or tin alloy plating, comprising (A) sulfuric acid, an alkanesulfonic acid, an alkanolsulfonic acid and derivative thereof, (B) a peroxide and (C) ions of a metal noble in potential to copper. Further, there is provided a method of whisker prevention for tin or tin alloy plating, characterized in that after immersion of a material to be plated in the above whisker preventive agent for tin or tin alloy plating, tin or tin alloy plating is carried out.