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

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Rex Waygood
Sent: Friday, August 06, 2010 5:39 AM
To: [log in to unmask]
Subject: [TN] Wave Corrosion

http://ipc-technet.groupsite.com/gallery/14785

This is an impeller off a Vectra. The impeller is less than one year old
and it was purchased as being lead free compatible.
The alloy is SN100C.

These photos were taken at the point of it being replaced. 
Serious concern was raised at the inspection 4 months before and steps
were taken to get a replacement.
The degradation during the period taken to get a replacement is very
alarming.

Assays of both bath and dross have not shown concerning levels of iron,
it is a big bath! (I did some rough arithmetic and 0.005% was equal to a
~17mm cube of SS)

The machine is usually operated at 265C.

We are now going to recheck the drain plug!!!!!

Rex

Rex Waygood
Technical Manager
 
Hansatech EMS provides value manufacturing through engineering and
quality
 
Hansatech EMS Limited
Benson Road
Nuffield Industrial Estate
Poole
Dorset
BH17 0RY
 
+44 (0)1202 338200

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