Journal
JOURNAL OF ELECTRONIC MATERIALS
Volume 39, Issue 1, Pages 105-108Publisher
SPRINGER
DOI: 10.1007/s11664-009-0958-1
Keywords
Metal and alloys; lead-free solders; aging; phase transformations; tin pest; chemical analysis
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Funding
- Austrian Science Foundation (FWF) [P 17346]
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Two samples of Sn-0.5Cu solder alloys, stored at -18A degrees C for 7 years, were chemically analyzed by an inductively coupled plasma-optical emission spectroscopy method. One of the samples was unaffected by this exposure; the other one had completely transformed into brittle alpha-Sn. Ten elements were found to exhibit statistically significant differences in their concentrations between the two samples, with the higher always associated with the untransformed sample. The highest concentrations were found for elements with an appreciable solubility in Sn, i.e., Bi, In, Pb, and Sb.
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