Abstract
This paper reports on a study of the reaction of solder with the electrolessnickel with immersion gold (ENIG) plating system, and the resulting interfacial structures. Aforcused-ion beam (FIB) was used to polish the cross sections to reveal details of the microstructure of the ENIG-plated pad with and without soldering. High-speed pull testing of solder joints was performed to expose the pad surface. Results of scanning-electron microscopy/energy-dispersive x-ray analysis of the cross sections and fractured pad surfaces support the suggestion that black pad is the result of galvanic hyper-corosion of the plated electroless nickel by the gold plating bath. Criteria are proposed for diagnosing black pad of ENIG plating.
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Zeng, K., Stierman, R., Abbott, D. et al. The root cause of black pad failure of solder joints with electroless Ni/Immersion gold plating. JOM 58, 75–79 (2006). https://doi.org/10.1007/s11837-006-0187-5
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DOI: https://doi.org/10.1007/s11837-006-0187-5