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Electrochemical migration of Sn-Pb and lead free solder alloys under distilled water

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Abstract

Electrochemical migration (ECM) is a potential reliability problem in electronic soldering which might become more dangerous in lead free electronic devices. In this paper, electrochemical migration tests on Sn-Pb and lead free solder alloys were conducted under distilled water by applying constant voltages with a power supply. The susceptibility of the solder alloys to ECM and the effect of the composition on ECM behavior were studied. It is found that both Sn-Pb and lead free solders investigated in present research have susceptibility on ECM. Dendrites grow from cathode to anode and show different morphologies with the different migration elements involved. In Sn-37Pb and Sn-36Pb-2Ag solders, the main migration element is Pb. While for Sn-Ag and Sn-Ag-Cu solder alloys, Sn leads the migration. For Sn-8Zn-3Bi, both Sn and Zn can migrate. Furthermore, the effect of applied voltage on the time to short and short resistance was also investigated. As could be expected, the higher the voltage is, the shorter the failure time is. The electrochemical migration mechanism of the solder alloys was also discussed.

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Author notes

  1. D. Q. Yu

    Present address: Georg-Simon-Ohm University of Applied Sciences, D 90489, Nuernberg, Germany

Authors and Affiliations

  1. Georg-Simon-Ohm University of Applied Sciences, D 90489, Nuernberg, Germany

    W. Jillek & E. Schmitt

  2. Fraunhofer IZM, Berlin, Germany

    D. Q. Yu

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  1. D. Q. Yu
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  2. W. Jillek
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  3. E. Schmitt
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Correspondence to D. Q. Yu.

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The author is now at Fraunhofer IZM, Berlin, Germany

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Yu, D.Q., Jillek, W. & Schmitt, E. Electrochemical migration of Sn-Pb and lead free solder alloys under distilled water. J Mater Sci: Mater Electron 17, 219–227 (2006). https://doi.org/10.1007/s10854-006-6764-0

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  • DOI: https://doi.org/10.1007/s10854-006-6764-0

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