Elimination of Nickel Corrosion in ENIG and ENEPIG by Using Reduction Assisted Immersion Gold In Place Of Standard Immersion GoldAuthors: George Milad, Jon Bengston and Albin Gruenwald
Company: Uyemura International Corporation
Date Published: 9/22/2019 Conference: SMTA International
In an effort to highlight and mitigate nickel corrosion defects, The IPC plating Committee 4-14 has undertaken a revision of the original IPC – 4552 Specification (issued 2002). IPC ENIG Specification 4552-Rev A, was issued in 2017. The specification was revised again in 2019 (Rev B). Rev B is in final draft; awaiting final Ballot. When released corrosion inspection would become mandatory.
The objective of the second revision IPC 4552 Rev B is to eliminate nickel corrosion, by focusing attention on the defect. Suppliers will have to offer more robust processes and manufacturers would have to instill tighter process control. One of the supplier’s attempts to eliminate nickel corrosion is the introduction of “Reduction Assisted Immersion “gold (RAI).
This paper will address the role of RAI gold in eliminating corrosion in first in ENIG and then in ENEPIG.
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