THE POTENTIODYNAMIC POLARIZATION BEHAVIOR OF PB-FREE XIN-9(5AL-ZN)-YSN SOLDERS

an investigation for developing Pb-free Al-Zn-Sn solders, indium was a dded to lower the melting point of the solders. The melting point of a 10In-9(5Al-Zn)-Sn solder was found to be 192 degrees C when measured with differential scanning calorimetry. Meanwhile, the potentiodynamic electrochemical behaviors of thus prepared In-Al-Zn-Sn solders in a 3 .5% NaCl solution were explored. The investigated solders exhibit elec trochemical passivation behaviors. The corrosion products formed durin g the polarization study were characterized with scanning electron mic roscopy and X-ray diffraction. The corrosion products formed, dependin g on potential, during polarization were found to be ZnO, SnO, SnO2 an d Sn3O4. (C) 1998 Elsevier Science S.A.