Brian, Thanks! I know the difference between a volt and an ohm and quite a bit about solderability, but I don't profess to know very much about the inner workings of electrical components. Bev -------------------------- Sent from my BlackBerry Wireless Handheld (www.BlackBerry.net) -----Original Message----- From: Brian Ellis <[log in to unmask]> To: TechNet E-Mail Forum. <[log in to unmask]>; Bev Christian <[log in to unmask]> Sent: Sun Oct 19 03:10:33 2003 Subject: Re: [TN] Question about wetting Bev As the components are trimmer capacitors, I don't think ESD would be an issue. If they were jigged in a metal frame that could be earthed after they were treated. There is another point that should be considered: the trimmers may be lubricated with a conductive grease; this could be removed by water washing. Brian Bev Christian wrote: > Brian, > Nortel tried this in the nineties and had electrostatic damage problems. > Bev > > -----Original Message----- > From: Brian Ellis [mailto:[log in to unmask]] > Sent: October 18, 2003 3:06 AM > To: [log in to unmask] > Subject: Re: [TN] Question about wetting > > > If the parts are not hermetic (i.e., may absorb water and not be able to > get it out again), then there is no reliable solution to your problem. > OTOH, if you're sure you can get the water out again without any > internal damage having been caused, then any of the described methods > may be used. > > However, there is another possibility which may just work while on > reels, a reductive plasma. The obvious one would be hydrogen or a > mixture of hydrogen and a hydrofluorocarbon, but I have no idea of > anyone who could do this safely -- maybe the plasma machine makers could > advise you. Obviously, you would require to do tests to make sure that > the components (or reels) were not damaged. > > Brian > > John Foster wrote: > >>One big problem we have is that the parts are not hermetic. In fact we are >>looking at a alternate part because of this. I am going to look into the >>mechanism of oxidation. >> >>Thanks for all of the ideas so far. >> >>John >> >> >>-----Original Message----- >>From: TechNet [mailto:[log in to unmask]]On Behalf Of Bev Christian >>Sent: Friday, October 17, 2003 11:42 AM >>To: [log in to unmask] >>Subject: Re: [TN] Question about wetting >> >> >>John, >>Are they non-solderable because the tin has oxidized, the tin has been >>consumed as tin/nickel intermetallic that has then oxidized or the tin was >>so porous the nickel has oxidized? Also are the parts hermetic? If they >>are hermetic and you are sure they are just surface tin oxidized, throw them >>in some dilute EDTA, wash with DI water, IPA and then retape. If it >>anything else you would have to use acid to dissolve off whatever layers are >>there and then immediately re-tin. >> >>Then there is an electrochemical way to strip off the bad layers called >>ROSA. But this assumes they are either hermetic or can be fixtured to just >>immerse the leads. I wouldn't want that job! And Dave Hillman's ROSA >>unit is not up and running at this time. EMPF's?? >> >>regards, >>Bev Christian >>Research in Motion >> >>-----Original Message----- >>From: John Foster [mailto:[log in to unmask]] >>Sent: October 17, 2003 2:14 PM >>To: [log in to unmask] >>Subject: [TN] Question about wetting >> >> >>I have a large inventory of trim capacitors that have exceeded the >>manufacturers shelf >>life by 2 years. Solderability testing has revealed inadequate wetting. The >>parts are on >>tape and reel. The plating is a thin layer of tin over nickel. We believe we >>have a oxidation problem. Does anyone have any ideas AT ALL on how we can >>recover these >>parts. The part has gone obsolete I have 86,000 of these things that I >>really really need to use. >> >>Any help would be appreciated >> >>Thanks >>John Foster >> >>--------------------------------------------------- >>Technet Mail List provided as a service by IPC using LISTSERV 1.8e >>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 >>847-509-9700 ext.5315 >>----------------------------------------------------- >> >>--------------------------------------------------- >>Technet Mail List provided as a service by IPC using LISTSERV 1.8e >>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 >>847-509-9700 ext.5315 >>----------------------------------------------------- >> >>--------------------------------------------------- >>Technet Mail List provided as a service by IPC using LISTSERV 1.8e >>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 847-509-9700 ext.5315 >>----------------------------------------------------- >> > > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 847-509-9700 ext.5315 > ----------------------------------------------------- > > --------------------------------------------------- > Technet Mail List provided as a service by IPC using LISTSERV 1.8e > 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 847-509-9700 ext.5315 > ----------------------------------------------------- > --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 1.8e 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 847-509-9700 ext.5315 -----------------------------------------------------