Environmental analysis of Pb-free solders applicable for electric device

抄録

Life cycle inventory analyses for Pb solder and Pb-free solder were conducted to evaluate CO₂ emissions during the life cycle of the solders. CO₂ emissions in material production, waste treatment and recycling of Pb solder and Pb-free solder were calculated and quantified. In the case of recycling, effective recycle rate and CO₂ emission intensities of solders at the recycle rate were investigated. Life cycle CO₂ emissions of Pb solder were larger than those of Pb-free solders due to large energy consumption required for rigid waste treatment (Pb solder: 83.0, Pb-free solder: 2.88 (kg-CO₂Ikg-solder)). In the case of recycle system, it was found that the total CO₂ emissions of Pb-free solders were smaller than those of Pb solder (Pb solder: 18.3, Pb-free solder:2.88 (kg-CO₂/kg-solder)). It was concluded that Pb-free solder has superiority to Pb solder in the view point of life cycle CO₂ emissions.