Effect of temperature on electrochemical corrosion of Zn-30Sn lead-free solder

Electrochemical measurements were employed to study the effect of temperature on the electrochemical corrosion of Zn-30Sn in neutral 0.5 M NaCl solution. The corrosion products were characterized by SEM and EDXA. OCP and potentiodynamic polarization results indicate that the increased temperature would negatively shift OCP and E corr values of Zn-30Sn, increase the i corr from 6.76 μA/cm 2 to 24.97 μA/cm 2 , deteriorate the corrosion resistance thermodynamically and kinetically. EIS result also illustrates that increasing the temperature will decrease the total resistance value. Microstructure observations demonstrate that the surface corrosion layer with higher temperature forms a more coarse plate-like microstructure, providing less protection to the substrate.