Technetters,

I seem to remember this coming up previously, but I couldn't find it in the archives... What causes solder joints to have a blue tint?

I have a card where most of the solder joints across the assembly have a blue tint to them. It's Sn63Pb37 solder on a SnPb HASL board and a variety of part finishes - but the pads that weren't pasted don't exhibit the blue color. This is the only card in the lot that has this condition, but I don't know what process it may have seen differently from the others.

Some kind of oxide?

Thanks in advance,
Ben


______________________________________________________________________
This email has been scanned by the MessageLabs Email Security System.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 16.0
To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Technet
To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL)
To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest
Search the archives of previous posts at: http://listserv.ipc.org/archives
For additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------