I have no idea, it may be all of those. All I know is that many are titanium-lined. It may or may not be the source, but if your pot is titanium-lined that may be where the trace amounts are coming from. If so, I would imagine a small amount is leaching into the solder. I don't think the wash system could selectively add Ti to only the solder joints on any given CCA.
Have you tried performing EDX on a 100% SMT CCA that has gone through the wash?
-----Original Message-----
From: Amol Kane [mailto:[log in to unmask]]
Sent: Thursday, June 13, 2013 9:16 AM
To: Stadem, Richard D.; TechNet E-Mail Forum
Subject: RE: Titanium
Richard, so What would cause it to leach into the solder? -- Improper coating application? Temperature of the solder in the pot?...etc., etc.,. would this show up in solder analysis? (Are the labs doing these analysis even checking for Ti?)
Leland, no Ti pallets on our products, but not sure if they are used on someone else's. I will check. However, is your concern that the Ti is leaching from the pallets into the saponifier and is being re-deposited on the assemblies in the wash?
Thanks,
Amol
-----Original Message-----
From: Stadem, Richard D. [mailto:[log in to unmask]]
Sent: Thursday, June 13, 2013 9:09 AM
To: TechNet E-Mail Forum; Amol Kane
Subject: RE: Titanium
Many newer wave-solder and selective solder machines have a titanium-lined pot and/or sump. The newer the machine, the higher the Ti count.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Thursday, June 13, 2013 9:04 AM
To: [log in to unmask]
Subject: [TN] Titanium
Dear Technetters,
We are seeing some titanium residues (confirmed by EDX) on solder joints after wave soldering post wash (that is not to say they are not present post wave, more analysis is ongoing). Water soluble process, high lead alloy, and a saponified wash. So far the Ti residues are only detectable on the solder joints, not on the assy surface. For general information. what are some possible sources of Ti on the assembly?
Regards,
Amol
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