Me too. It looks like oxidized nickel which will not wet. > Date: Thu, 9 Jun 2011 09:12:00 -0700 > From: [log in to unmask] > Subject: Re: [TN] Black Pad? > To: [log in to unmask] > > I'm with Steve on this one... > > Paul > > Paul Edwards > Process/Quality Engineering > Surface Art Engineering > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory > Sent: Thursday, June 09, 2011 6:59 AM > To: [log in to unmask] > Subject: Re: [TN] Black Pad? > > Hi Gary, > > I got your pictures this morning, and have them posted now: > > http://stevezeva.homestead.com/Joint_1.JPG > > http://stevezeva.homestead.com/Joint_2.JPG > > http://stevezeva.homestead.com/via.JPG > > Although the pictures show some non-wetting happening, it's difficult to see > what exactly is going on. > > You say that the component side seems fine, it's just when you're trying to > wave solder is when you see the problem. Maybe you have thin gold, and when > the boards were fresh, the SMT was able to solder fine. But then after the > boards went through reflow, the underlying nickel oxidized so badly that > solder wasn't able to wet? > > Steve > > -----Original Message----- > From: TechNet [mailto:[log in to unmask]] On Behalf Of Gary Robinson > Sent: Wednesday, June 08, 2011 4:46 PM > To: [log in to unmask] > Subject: [TN] Black Pad? > > We have noticed a problem only on ENIG boards in our WAVE process that looks > similar to Black Pad but do not know how to identify or where to begin to > find a resolution to the problem. We were hoping an expert may have > experience in seeing this problem. Here are some facts - > 1. Black residue is on the vias and thts on the solder side. Please see the > attached images. > 2. Component Side SMT Parts do not exhibit the same problems. > 3. Boards are processed PbFree - SAC305, Pacific 2009m No Clean Water Based > flux > 4. THTs will not wet after residues appear (for touch up process) > 5. Blowholes appear to accompany the defect but are not always present. > > Thanks for your help in advance. > > > ______________________________________________________________________ > 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 > ----------------------------------------------------- > > > ______________________________________________________________________ > 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 > ----------------------------------------------------- > > > ============================================================================== > > This email and any attachments thereto may contain private, confidential, and > privileged material for the sole use of the intended recipient. 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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 -----------------------------------------------------