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| What's the reason of Ni/Cu exposure on pcb gold-plated surface? |
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Its possibility is surface oxidation of nickel, foreign body contamination. there may be insufficient activity If it is a chemical gold (ENIG), Immersion gold and gold plating chemical treatment methods are not the same, but the common sense is to exclude foreign matter and contamination and to maintain proper active surface, so that it can do the gold plating well, for your reference.
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