A study on the corrosion proceses of eutetic solder Bi-42Sn alloy

Abstract

The change of impedance of the passive, rcpassive states together with initial pitting process of eutectic Sn-Bi alloy is studied. Anodic polarization measurements were performed to evaluate the passive, pilling, and repassive states and the actual results used to assure the accuracy of the impedance results. X-ray pholoelectron spectroscopy indicates that Sn oxides interact with Bi oxides to form a passive film. The dissolution of Bi results in the initial pitting and Sn oxides form the repassive film.