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Craig Sullivan <[log in to unmask]>
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TechNet E-Mail Forum <[log in to unmask]>, Craig Sullivan <[log in to unmask]>
Thu, 27 Aug 2015 09:03:22 -0400
text/plain (82 lines)
J-STD-003 and IPC-4552 basically state the ENIG should meet category 3 (>6
months storage).

My question is, what is the storage threshold for ENIG after the 6 months? 1
year, 2 years?

What length of time should we conceivably expect to be able to store an ENIG
board before seeing issues?


Scenario: PCBs just over a year old are showing signs of oxidation after
processing, components can be flicked off with ease. The Cu and Ni (if any
left) on a PTH look horrendous after processing. Here's a kicker, these
boards are date code 3414, but date code 3514 appears to be ok and solders
fine, and date code 3114 shows a very low and random case of the
oxidation/solderability issue. 


All PCBs stored in the same environment/manner


Craig Sullivan

Manufacturing Engineer / IT Administrator

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