Hi, 
Recently we encountered some assembled PCB returned from the field where 
humidity is high and temp is low. Some vias and pads were found to be corroded 
with copper chloride after SEM analysis and when corrosion production were 
removed from the board, the affected part of the vias was degraded.  This has 
greatly affected the performance of the circuit.
The fabrication house claimed that they are not liable as there was not chloride 
chemical used in their processes.  
Does anyone has any insights to share?  Could the assembly process contribute to 
this corrosion?

Thanks in advance for any information shared.


stella yap

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