Hi Rex!

Got your pics and posted them up my page:

http://stevezeva.homestead.com/Impeller1.JPG

http://stevezeva.homestead.com/Impeller2.JPG

http://stevezeva.homestead.com/Impeller3.JPG

http://stevezeva.homestead.com/Impeller4.JPG

http://stevezeva.homestead.com/Impeller5.JPG

Man! That's pretty bad! If it was a coated impeller, that's the drawback
that I have heard about coatings. I have heard that melonite coatings are
really susceptible to scratching, and once that happens the coating is
worthless. Titanium is much, much better.

Back before it was realized that tin erodes wave solder components, I once
heard about a bad incident with a company that did downhole electronics
using Sn96Ag4 solder. They had been hand soldering everything for years and
then decided to get a wave solder when their volumes increased. They had
their machine for about a year and a half. They came into work one morning
after a long 3-day weekend (they had the machine on a timer so it would be
ready when they came into work), only to find the entire contents of the pot
on the floor. The solder had eaten a hole in the pot!

Steve  

-----Original Message-----
From: Rex Waygood [mailto:[log in to unmask]] 
Sent: Friday, August 06, 2010 7:47 AM
To: TechNet E-Mail Forum; Steve Gregory
Subject: RE: [TN] Wave Corrosion

I forgot to say the impeller was a retrofit on the machine.
Rex 

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: 06 August 2010 12:14
To: [log in to unmask]
Subject: Re: [TN] Wave Corrosion

Ummm
The website crashed just after I put the images up, obviously the site
didn't like my pictures either.
As far as I know the surface treatment used is Melonite QPQ. 
Regards
Rex


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Steve Gregory
Sent: 06 August 2010 12:09
To: [log in to unmask]
Subject: Re: [TN] Wave Corrosion

Hi Rex!

Your link appears to be broken. I would have liked to seen the photos.
Was the machine brand new or was it retrofitted to be lead free
compatible? Do you know what the impeller was made of? Or was it coated
to protect it from high tin content solder?

Steve



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