High Folks,
I knew somewhere that it was not difficicult to verify materials if it
is Ti or stainless steel. And tonight I found it:
Titanium float on leadfree solder, because the specific gravity is
about 4.54 gr/cm3,
stainless steel sinks in leadfree solder but float on SnPb40 becaus
its specific gravity is about 7.8 gr/cm3. So simple is it.
That's why when using leadfree wave solder systems, one has to change
their stainless steel tools, nuts and boults into titanium due to the
risk that sunken stainless steel parts damage the pump proprellors.
So be aware!
Peer Langeveld
Consultant Soft Soldering Processes
5503 VH 8 The Netherlands
2006/7/25, Rodney Miller <[log in to unmask]>:
> Something Mechanical, I like that...
>
> Thanks guys, now I know "Bai Si" is White, I'll have to look up orange
> in chinese...LOL
>
> Rodney
> -----Original Message-----
> From: R Sedlak [mailto:[log in to unmask]]
> Sent: Monday, July 24, 2006 2:04 PM
> Subject: Re: Whats a good way to verify material is Ti vs Stainless?
>
>
> Nice, elegant, cheap... nicely done.
>
> Rudy Sedlak
>
> Martin Butcher <[log in to unmask]> wrote: If memory serves, Ti
> gives off white sparks when touched to a grinding wheel. SS sparks
> should be orange.
>
> Granted its cheap and dirty, but hey...
>
> Martin
>
> -----Original Message-----
> From: R Sedlak [mailto:[log in to unmask]]
> Sent: Monday, July 24, 2006 10:14 AM
> To: [log in to unmask]
> Subject: Re: [TN] Whats a good way to verify material is Ti vs
> Stainless?
>
>
> Can you get known samples of Ti and SS?
>
> I do not know for sure, but suspect strongly that a dilute (say 1% to
> 5%) solution of Ammonium Bifluoride would not attack SS rapidly enough
> to be noticed, but would attack Ti rapidly enough to cause visible
> bubbling, when it was dripped on a surface.
>
> Try this out first, to see if my suspicions are correct.
>
> Rudy Sedlak
> RD Chemical Company
>
> Rodney Miller wrote: Houston, we have a problem,
> we are fighting a contaminated solderpot,
> and I'm not finding the source... the machine is in China, so I'd
> appreciate some test that I could convey which would tell me I'm not
> losing my mind... yet
>
> Rodney L. Miller
> Tri-onics Inc
> Highland / Shanghai
>
> Integrity and Solutions for Electronic Outsourcing
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