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Tin plating turns black after soldering




July 9, 2010

Hi recently I encounter problem in my production line. Have a tin plated jumper turning black during soldering. The appearance of the plating is normal (matte silver colour).
Please advise what could have happen and what can I do to continue use these jumpers.
Thank you.

Karen Seah
QC Engineer - Singapore



August 8, 2010

Hi Karen,

It could be due to organic contamination of tin plating bath and cause excess carbon codeposit into tin deposit. Carbon content in tin deposit should not be more than 500 ppm. Recommend to do carbon polishing of tin plating bath when necessary.

Best regards,

David Shiu
David Shiu
- Singapore




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