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Investigation of whisker growth from alkaline non-cyanide zinc electrodeposits

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posted on 25.11.2016, 14:16 by Liang Wu, Mark Ashworth, Geoffrey Wilcox
Electroplated zinc finishes have been widely used in the packaging of electronic products for many years as a result of their excellent corrosion resistance and relatively low cost. However, the spontaneous formation of whiskers on zinc electroplated components, which are capable of resulting in electrical shorting or other damaging effects, can be highly problematic for the reliability of long-life electrical and electronic equipment. This work investigated the mechanism for whisker growth from zinc electrodeposited mild steel substrates. The incubation time for whisker growth from the surface of nodules on the surface of the electrodeposit was considerably reduced compared with that from the planar deposit surface. Recrystallisation of the as-deposited columnar structure was observed at the whisker root. This result is consistent with some recent whisker growth models based on recrystallisation. There was no evidence of iron-zinc (Fe-Zn) intermetallic formation at the iron/zinc (Fe/Zn) interface or within the zinc coating beneath the whiskers.

Funding

The authors would like to thank the United Kingdom Engineering and Physical Sciences Research Council (EPSRC) Innovative Electronics Manufacturing Research Centre for funding this research through the WHISKERMIT programme at Loughborough University.

History

School

  • Science

Department

  • Chemistry

Published in

Journal of Electronic Materials

Citation

WU, L., ASHWORTH, M.A. and WILCOX, G.D., 2017. Investigation of whisker growth from alkaline non-cyanide zinc electrodeposits. Journal of Electronic Materials, 46(2), pp.1114-1127.

Publisher

© The Author(s). This article is published with open access at Springerlink.com

Version

VoR (Version of Record)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution 4.0 International (CC BY 4.0) licence. Full details of this licence are available at: http://creativecommons.org/licenses/ by/4.0/

Acceptance date

18/10/2016

Publication date

2017

Notes

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

ISSN

0361-5235

eISSN

1543-186X

Language

en

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