(大连理工大学 材料工程系， 大连 116024)
摘 要: Zn的活泼性使Sn-9Zn无铅钎料的润湿性和抗氧化性很差， 在Sn-9Zn合金中加入适量混合稀土元素(Ce, La)可以改善其润湿性能。分别在245， 260和290℃通过润湿平衡实验对钎料的润湿性进行了研究， 并对RA, RMA, R和WWR 4种不同钎剂进行了比较。 结果表明： 在运用活性松香钎剂时，微量混合稀土元素可以显著提高Sn-9Zn合金润湿性； 而提高钎焊温度也可以改善润湿性能。
关键字: 无铅钎料； 稀土； Sn-9Zn； 润湿性
trace rare earth elements
（Department of Materials Engineering, Dalian University of Technology,
Dalian 116024, China）
Abstract:The eutectic Sn-9Zn alloy is one of the lead-free solder alloys at the present time. Since Zn is an active element in solder, the wetting and corrosion properties of Sn-9Zn alloy are impaired. In order to improve the wetting behavior, trace rare earth elements were added into Sn-9Zn alloy. The wetting balance tests were conducted in ambient air to reveal the wetting behavior. Several types of flux, i.e. RA, RMA, R and WWR, were used to study the wetting properties of the Sn-9Zn-RE alloy system at 245, 260 and 290℃, respectively. By using RA flux, the trace RE addition can improve the wetting behavior significantly and the increasing of the temperature can also improve the properties.
Key words: lead-free solder; rare earth element; Sn-9Zn; wettability
