Abstract: Effect of Ag on microstructure， melting point， microhardness and corrosion resistance of Sn － 9Zn solder was researched by adding elements Ag to the solder through experiment．The results show that by adding element Ag to the Sn－9Zn alloy solder， its microstructure and mechanical properties are remarkably improved． Ag and Zn can form the AgZn₃ compound ，the form action of the large needle － like Zn phase is refined and radiating outward at the same time．Furthermore it has a good performance in the dispersion strengthened of alloy matrix．The melted point is increased 2 ℃．The wettability is raised 20%．The average microhardness can be enhanced 10.02%．The corrosion potential is noticeably raised and close to Sn－37Pb．The corrosion － resistance is obviously reinforced．

Key words: Sn－9Zn solder , Ag , Microstructure , Melting point , Microhardness , Corrosion resistance

摘要： 通过实验研究了元素Ag对Sn-9Zn共晶钎料微观组织、熔点、显微硬度及抗腐蚀性的影响。结果表明，添加Ag元素后，能使Sn-9Zn合金组织和性能得到明显改善，其中Ag和Zn形成AgZn₃化合物，可以抑制粗大针状Zn相组织的生长，并呈放射状，对合金基体起到很好的弥散强化作用；熔点提高2 ℃；润湿性提高20%；显微硬度提高10.02%；腐蚀电位明显提高，抗腐蚀性能得到改善，接近于传统Sn-37Pb钎料。

关键词: Sn－9Zn 钎料 , Ag , 微观组织 , 熔点, 显微硬度, 抗腐蚀性