In this paper，thr relationships between composi-tion,structure and soldering of bright tin electrode-posits were studied using the electrochemical methods,XPS．metallographic techniaues and positron annihila-tion lifetime spectroscopy. The influence of Co4+ and Sb(III) ion in tin baths，the growth of diffusionlayer of Cu-Sn alloy between doposited tin and copperbase and the soldering mochanism o...学位：理学硕士院系专业：化学化工学院化学系_物理化学(含化学物理)学号：SHAO00014