Titanium is used as a material of construction in PCB manufacture/assembly
equipment because it is resistant to chemical (Etchants) and metals (molten
solder). So anything exposed to solder on wave machine can be Ti. Pots, pump
impellors conveyor fingers etc. I would be surprised if there was any
significant Ti in solder from metallic sources such as these. 

Joyce's suggestion is a good one: Inks and stuff. I don't know why you are
still using a saponifier cleaner, but they are aggressive high PH chemicals
and therefore effective paint/coating/ink strippers, possibly also your
laminate. You say you have cleaning issues which supports that case.
On my list of things to eliminate I would place PCBs as supplied and
controls on cleaning machine/process high on the list and metallic Ti as
source somewhat lower.

Best Wishes
 
 
 
Mike-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Amol Kane
Sent: Thursday, June 13, 2013 3:59 PM
To: [log in to unmask]
Subject: Re: [TN] Titanium

Hello Brian,
We are trying to find out the source of the white residue we see post wash
(to see if ionic cleanliness is an issue). Our concern also is the adhesion
of potting and CC if the residue is left on the board assuming it is benign.


Regards,
Amol



-----Original Message-----
From: Brian Ellis [mailto:[log in to unmask]] 
Sent: Thursday, June 13, 2013 9:36 AM
To: TechNet E-Mail Forum; Amol Kane
Subject: Re: [TN] Titanium

Both ideas are potentially valid. It would be easy to trace the source by
EDXing a sample of the raw solder in the machine, as well. I take it the Ti
concentration is in the ppm/ppb range. Perhaps your question is really
whether small quantities of Ti will affect the reliability of the solder
joint? I think not.

On 13.06.2013 17:03, Amol Kane wrote:
> 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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