Sorry, I'm always confused with microinches and microns. :-( The
thickness is fine.

Vladimir

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Paymon Sani
Sent: Tuesday, February 12, 2008 2:30 PM
To: [log in to unmask]
Subject: [TN] Through Hole Pad Solder Non-Wetting

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


---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
Please visit IPC web site
http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional
information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100
ext.2815
-----------------------------------------------------

---------------------------------------------------
Technet Mail List provided as a service by IPC using LISTSERV 15.0
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
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
-----------------------------------------------------