Hello All,

 

We experienced solder non-wetting to a PCB through-hole component pad
surface. The PCB surface finish is ENIG. The microsection results from
the suspect PCBs show that the Nickel plating is thin from 1 to 3
micro-inches. We related the thin Nickel plating to Nickel corrosion and
PCB surface non-wetting. However, the microsection also revealed copper
corrosion at Copper to Nickel interface! I have never seen the copper
corrosion in the past and I would like to ask if any of you has a
similar experience in the past. What could be the cause of copper
corrosion? I have few images if you are interested to see them.

 

Regards,

Paymon


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