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«The Study, Measurement, and Prevention of Tarnish on Immersion Silver Board Finishes Lenora Toscano and Donald Cullen MacDermid, Inc. Waterbury, CT ...»

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Dendritic growth was not observed on any of the boards tested for electromigration and electrical resistance did not degrade a decade throughout testing. Contact resistance testing showed silver maintained high conductivity with a small deviation even at high levels of tarnish.

REFERENCES

1. Lead Free Homepage: http://www.leadfree.org

2. D.Cullen; “HASL Alternatives.” PC Fabrication, July 1999

3. G.Mallory. Electroless Plating; 1990 AESF Publications.

4. D. Cullen, L. Toscano, “Immersion Metal PWB Surface Finishes: A direct Comparison of Selected Fabrication, Assembly, and Reliability Characteristics,” IPC Works September, 2000

5. Bratin, P., Pavlov, M. PC Fab, 1999, May p.30-37.

6. Redline, R., Sawoska, D. U.S. Patent 6 544 397, 2003

7. IPC/EIA J-STD-003A, April 1992

8. M. Kelsey, “Report 33142 Class IIa MFG” Aspen Research Corporation, November 2002

9. M.Peel, “Report 201274 Probe Test” Contech Research, March 2003

10. R.Michalkiewicz, “Report 48991 Bellcore GR-78 Core 13.2.7,” Trace Laboratories East, March 2001

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