Open circuit potential analysis of Sn-9Zn Pb-free solder in different solutions

Abstract

The open circuit potential of Sn-9Zn lead-free solder was studied in distilled water and 6 M KOH solutions. The potential arises with the prolonged immersion time prior reaching saturation regardless of the solution. Morphological analysis shows distinctive oxides formation inhibiting the surface of the solder after immersion in distilled water and 6 M KOH. Furthermore, phase analysis reveals that the original Sn-9Zn peak intensities are reduced significantly with several new phases detected after immersion.