Mechanical Properties and Electrochemical Corrosion Behavior of Al/Sn-9Zn-xAg/Cu Joints

被引：41

作者：

Huang, M. L. ^{[1
]}

Huang, Y. Z. ^{[1
]}

Ma, H. T. ^{[1
]}

Zhao, J. ^{[1
]}

机构：

[1] Dalian Univ Technol, Elect Packaging Mat Lab, Sch Mat Sci & Engn, Dalian 116024, Peoples R China

来源：

JOURNAL OF ELECTRONIC MATERIALS | 2011年 / 40卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Al-Cu joint; Sn-9Zn-xAg; mechanical properties; electrochemical corrosion; corrosion potential; LEAD-FREE SOLDER; FREE SN-ZN; GA SOLDER; CU; AG; MICROSTRUCTURE; WETTABILITY; ALLOYS; NI; BI;

D O I：

10.1007/s11664-010-1459-y

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The effect of Ag content on the wetting behavior of Sn-9Zn-xAg on aluminum and copper substrates during soldering, as well as the mechanical properties and electrochemical corrosion behavior of Al/Sn-9Zn-xAg/Cu solder joints, were investigated in the present work. Tiny Zn and coarsened dendritic AgZn(3) regions were distributed in the Sn matrix in the bulk Sn-9Zn-xAg solders, and the amount of Zn decreased while that of AgZn3 increased with increasing Ag content. The wettability of Sn-9Zn-1.5Ag solder on Cu substrate was better than those of the other Sn-9Zn-xAg solders but worse than that of Sn-9Zn solder. The wettability of Sn-9Zn-1.5Ag on the Al substrate was also better than those of the other Sn-9Zn-xAg solders, and even better than that of Sn-9Zn solder. The Al/Sn-9Zn/Cu joint had the highest shear strength, and the shear strength of the Al/Sn-9Zn-xAg/Cu (x = 0 wt.% to 3 wt.%) joints gradually decreased with increasing Ag content. The corrosion resistance of the Sn-9Zn-xAg solders in Al/Sn-9Zn-xAg/Cu joints in 5% NaCl solution was improved compared with that of Sn-9Zn. The corrosion potential of Sn-9Zn-xAg solders continuously increased with increasing Ag content from 0 wt.% to 2 wt.% but then decreased for Sn-9Zn-3Ag. The addition of Ag resulted in the formation of the AgZn3 phase and in a reduction of the amount of the eutectic Zn phase in the solder matrix; therefore, the corrosion resistance of the Al/Sn-9Zn-xAg/Cu joints was improved.

引用

页码：315 / 323

页数：9

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