Corrosion investigations on lead-free micro-alloyed solder alloys used in electronics

The corrosion properties of different lead-free solder alloys (including novel low Ag content solder alloys) were investigated using the potentiodynamic polarization test method in 3.5 wt% NaCl solution. The results showed that most of the investigated lead-free micro-alloyed solders have better corrosion properties compared to the commonly used SAC305 lead-free solder alloy. The main causes of the different corrosion properties could be the different composition types and concentration of the alloying components.