ENIG corrosion problem

ENIG corrosion problem

Chlorine residue on this ENIG land caused corrosion of the underlying nickel and copper to form copper and nickel oxides on the gold surface.

Apparently the 3 – 7 micro-inches thick immersion gold layer is not always impervious to chloride migration.

Check out SEM Lab, Inc.  to learn more.

2 thoughts on “ENIG corrosion problem”

  1. Our FAB doing ENIG process with nickel plating -> sintering -> repeat 3 times and then final nickel & gold plating , I don’t know why should repeat it many times and wondering if it exist an efficient way to do only 1~2 times of plating ??

    1. Sorry for the delayed response. I am unfamiliar with sintering of electroless nickel during the ENIG plating process. What is the purpose of the multiple plating & sintering steps? Thanks!

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