Hi folks and thank you Steve for being "TechNet Picture Central"! Sorry but just to warn everyone but I am going to use the "B" word shortly. Inge - take a close look at picture 4. As Werner pointed out the gold is non-wetting the nickel in number of locations. What really jumped out at me is that "mud flat" appearance on some of the nickel surface regions - a "mud flat" appearance is a classic indication of black pad! I recommend you complete a cross-section to confirm that you have nickel grain boundary attack. But since it is Friday, go have a beer and worry about this on Monday! Dave Hillman Rockwell Collins [log in to unmask] Steve Gregory <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 05/04/2007 01:45 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Steve Gregory <[log in to unmask]> To [log in to unmask] cc Subject Re: [TN] Metalurgists, need assistance Hi Inge! Got your pictures posted. Took me a bit, I was swapping our wave solderpot from 63/37 to HMP. Done now. I'm getting quicker, I can do it in 20-minutes now. Took me about 45-minutes when I first did it... Anyways, here's the links: http://stevezeva.homestead.com/files/Pic1.jpg http://stevezeva.homestead.com/files/Pic2.jpg http://stevezeva.homestead.com/files/Pic3.jpg http://stevezeva.homestead.com/files/Pic4.jpg http://stevezeva.homestead.com/files/Pic5.jpg http://stevezeva.homestead.com/files/Pic6.jpg -Steve- -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Hfjord Sent: Friday, May 04, 2007 12:22 PM To: [log in to unmask] Subject: [TN] Metalurgists, need assistance Have an issue with (randomly) lifted FPGA leads. Pic 1: good joint after pull test Pic 2: ditto but high magnification Pic 3: "rotten" joint after pull test Pic 4: ditto but high magnification Pic 5: "rotten" cross section Pic 6: ditto but high magnification 60Sn on ENIG, obviously a brittle region. Suspect Kirkendall voids, but the pockets with zillions of Tin spheres (0.1 to 2 um in size) points at insufficient peak temperature to make 100% melt and good solidifying. If these little balls were Lead, I could understand, but they are Tin! Never seen like. Any "quickhead" out there, need fast advice. Note: Pic 2, you can see the underlying board pad nickel as dark areas. An experienced analyst will hopefully recognize. No Phosphorous peaks! My Friday headache. Inge --------------------------------------------------- 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 ----------------------------------------------------- --------------------------------------------------- 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 -----------------------------------------------------