Corrosion evolution of high-temperature formed oxide film on pure Sn solder substrate
Hui Zhao, Xu Sun, Long Hao, Jian-qiu WANG, Jingmei Yang
Abstract
The evolution of morphology, composition, thickness and corrosion resistance of the oxide film on pure Sn solder substrate submitted to high-temperature aging in 150 °C dry atmosphere was investigated. The results indicate that high-temperature aging accelerates the dehydration of Sn(OH)4 in the pre-existing native oxide film to form SnO2 and facilitates the oxidation of fresh Sn substrate, resulting in the gradual increase in oxide film thickness and surface roughness with prolonging aging time. However, the corrosion resistance of the film initially is enhanced and then deteriorated with an extending aging time. Besides, the formation and evolution mechanisms of the oxide film with aging time were discussed.