Paper Title:
Thermodynamics of Oxidation on Pb-Free Solders at Elevated Temperature
  Abstract

Based on the available thermodynamic and phase equilibria data, the thermodynamic criteria for oxidation in tin-based lead-free solders under soldering condition was deduced. The dependence of Gibbs free energy on temperature in Pb-free solder oxidation reaction was calculated by applying MATLAB program. The characteristics of oxidation reaction of a varity of solder alloy systems such as Sn-Ag, Sn-Cu, Sn-Sb, Sn-Zn, Sn-Ag-Cu and Sn-Pb eutectic alloys at elevated temperature were analyzed. The results suggested that zinc preferentially oxidized in Sn-Zn solder alloys in the elevated temperature state, while tin preferentially oxidized in the other alloys. The oxidation potential of the Sn-Zn eutectic alloys was higher than that of the pure tin at elevated temperature, whereas the oxidation potentials of Sn-Ag, Sn-Cu, Sn-Sb and Sn-Ag-Cu eutectic alloys were approxiately equal to that of the pure tin. All tin-based Pb-free solder alloys more easily oxidized than the Sn-Pb solder alloys. Oxidizability of these alloys followed in a decreasing order: Sn-Zn>Sn-Sb>Sn-Cu>Sn-Ag>Sn-Ag-Cu>Sn-Pb.

  Info
Periodical
Materials Science Forum (Volumes 610-613)
Main Theme
Edited by
Zhongwei Gu, Yafang Han, Fusheng Pan, Xitao Wang, Duan Weng and Shaoxiong Zhou
Pages
526-530
DOI
10.4028/www.scientific.net/MSF.610-613.526
Citation
F. Chen, Y. F. Du, R. C. Zeng, G. S. Gan, C. H. Du, "Thermodynamics of Oxidation on Pb-Free Solders at Elevated Temperature", Materials Science Forum, Vols. 610-613, pp. 526-530, 2009
Online since
January 2009
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$32.00
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