NDLI: Investigation of mechanism for spontaneous zinc whisker growth from an electroplated zinc coating

Content Provider	IEEE Xplore Digital Library
Author	Baated, A. Keun-Soo Kim Suganuma, K.
Copyright Year	2009
Description	Author affiliation: Graduate School of Engineering, Osaka University, Osaka, Japan (Baated, A.) \|\| Institute of Scientific and Industrial Research, Osaka University, Osaka, Japan Address: Mihogaoka 8-1, Ibaraki, Osaka 567-0047, Japan (Keun-Soo Kim; Suganuma, K.)
Abstract	Zinc (Zn) whiskers are tiny hair-like electrically conductive filaments of Zn that sometimes grow from Zn coated surfaces (e.g., electroplated, hot dip). Zn coatings are commonly used as anti-corrosion coatings for iron (Fe) based structures. One of many common applications for Zn coated Fe is found on raised-floor tiles and support structures utilized in computer data centers. The formation of Zn whiskers threatens the reliable operation of electronic equipments due to the electrical shorting hazard they present. As with tin whiskers (much more broadly researched than Zn whiskers), the mechanism of formation is still not clear. This work investigated the Zn whisker growth mechanism for an electroplated Zn coating above carbon steel substrate from a raised floor tile using recent technology methods. Iron-zinc (Fe-Zn) Intermetallics and Zn oxides were identified by X-ray diffraction analysis (XRD). EDS (energy disperse spectroscopy) and EPMA (electron probe micro analysis) identified Fe-Zn intermetallic compounds on the surface of the Zn layer in addition to the interface between Zn coating and carbon steel substrate. Zn oxides formed primarily on the surface of Zn coating. Consequently, we speculate that Fe-Zn intermetallic compounds and Zn oxide formation can be the source of compressive stress effect on Zn whiskers growth on electroplated Zn coating above carbon steel substrate.
Starting Page	1019
Ending Page	1022
File Size	2858865
Page Count	4
File Format	PDF
ISBN	9781424446582
DOI	10.1109/ICEPT.2009.5270576
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-08-10
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Zinc Coatings Iron Steel Intermetallic Tiles Carbon compounds Application software Electronic equipment Hazards
Content Type	Text
Resource Type	Article

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