Al和Cu对Sn-20Bi合金组织、导电率与抗腐蚀性的影响  

Influence of Al and Cu on microstructure,electrical conductivity and corrosion resistant property of Sn-20Bi Alloy

作　　者：李吉东 杨文超 李逸泰 湛永钟 冯均利[3] 吴景武[3] LI Ji-dong;YANG Wen-chao;LI Yi-tai;ZHAN Yong-zhong;FENG Jun-li;WU Jing-wu(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Nanning 530004,China;Shenzhen Entry-Exit Inspection and Quarantine Bureau,Shenzhen 518067,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004 [2]广西有色金属及特色材料加工重点实验室,广西南宁530004 [3]深圳出入境检验检疫局,广东深圳518067

出　　处：《广西大学学报（自然科学版）》2018年第5期1967-1975,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家重点研发计划项目(2016YFB0301402);深圳出入境检验检疫局科技计划项目(SZ2017001);广西有色金属及特色材料加工重点实验室开放基金(GXKFJ16-15;GXKFJ12-13);广西研究生教育创新计划项目(YCSW2017025);2017年广西大学实验室建设与实验教学改革项目

摘　　要：为解决无铅焊料抗腐蚀性能差而易造成焊点失效问题,对比研究了Sn-20Bi,Sn-20Bi-0. 3Al和Sn-20Bi-0. 5Cu焊料合金的导电性能、抗腐蚀性能的影响。结果表明,添加0. 3 wt%Al元素对于富Bi相的偏析影响较小,添加0. 5 wt%Cu元素的合金会形成中间化合物Cu6Sn5,富Bi相被粗化;添加0. 3 wt%Al使Sn-20Bi焊料合金的导电率从8. 92%IACS提高至9. 66%IACS,而添加0. 5 wt%的Cu使其导电率轻微降低至8. 85%IACS; Sn-20Bi-0. 3Al合金腐蚀电位和腐蚀电流分别上升为-536. 9 m V与8. 20×10^(-6)A/cm^2,Sn-20Bi-0. 3Al合金腐蚀时会形成蚀坑; Sn-20Bi-0. 5Cu的腐蚀电流密度为5. 51×10^(-6)A/cm^2,相比Sn-20Bi合金与Sn-20Bi-0. 3Al合金,Sn-20Bi-0. 5Cu合金的抗腐蚀性能更好。In order to prevent the fracture of soldered dot due to the terrible low corrosion resistance,the electrical conductivity and corrosion resistance of Sn-20Bi,Sn-20Bi-0.3Al and Sn-20Bi-0.5Cu lead-free solder alloys were investigated for studying the influences of 0.3 wt%Al and 0.5 wt%Cu on electrical conductivity and corrosion resistant property of Sn-20Bi alloy.The results show that the addition of 0.3 wt%Al in Sn-20Bi alloy has little effect on Bi-rich phase,and the addition of 0.5 wt%Cu in Sn-20Bi alloy can form Cu 6 Sn 5 and coarse the Bi-rich phase.The electrical conductivity value of alloy increases from 8.92%IACS to 9.66%IACS with the addition of 0.3 wt%Al,and the electrical conductivity of Sn-20Bi-0.5Cu decrease little to 8.85%IACS.The corrosion potential and current density of Sn-20Bi-0.3Al alloy are-536.9mV and 8.20×10-6 A/cm 2,respectively.The etch pits appear on corroded Sn-20Bi-0.3Al alloy.The corrosion current density of Sn-20Bi-0.5Cu alloy is 5.51×10-6 A/cm 2,which indicates that the corrosion resistant property of Sn-20Bi-0.5Cu alloy is better than those of Sn-20Bi and Sn-20Bi-0.3Al alloys.

关 键 词：无铅焊料 抗腐蚀性能 AL CU Sn-20Bi合金 

分 类 号：TG113.2[金属学及工艺—物理冶金]