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Date: | Wed, 1 Aug 2007 17:44:45 +0300 |
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Indeed strange. Very few crystals have this acicular form, except metal
whiskers. My first reaction is have them analysed!
Brian
Davis, Larry wrote:
> We have a strange problem here and I was hoping someone could provide an
> explanation. I had Steve post a couple pictures to his site for
> viewing, thanks Steve!
>
> We are seeing this crystalline growth all over a single assembly that
> was built back in Feb 07 and shipped to one of our customers who kept it
> stocked in the original esd bag. They noticed it once it was required
> for use and returned it to us. The only thing in our process that I
> think could possibly be the root cause is that our board cleaner solvent
> (Bioact EC-7R) was getting very flux loaded about that time but we
> haven't seen this on any other assemblies that have been built since
> then. We are using no-clean fluxes and only clean boards that have high
> impedance circuitry. I find it very strange that the growth occurs on
> the plastic parts as well as the leads of components. Any ideas?
>
> http://stevezeva.homestead.com/files/crystal_growth.jpg
>
> http://stevezeva.homestead.com/files/crystal_growth_closeup.jpg
>
>
> Thanks in advance for your feedback!
>
> Larry Davis
> Hach Co.
>
>
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