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January 2002

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Date:
Thu, 31 Jan 2002 08:49:20 -0600
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Hi Guenter! Great information! One additional question - do you know if
the molten tin attack is more severe on base stainless steel alloys such as
the 301-304 alloy series or are the microalloyed 316/321/347 alloy series
equally attacked? Also, I have always made the assumption that titanium
with its tough natural oxide would be pretty immune to molten tin attack
but don't have any experience or data to back that up. I know that some of
the equipment vendors use titanium in the wave equipment but haven't seen
any information of molten tin attack.

Dave




Guenter Grossmann <[log in to unmask]>@ipc.org> on 01/31/2002
02:15:53 AM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to Guenter Grossmann <[log in to unmask]>

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:

Subject:  [TN] Antw: [TN] Wave Solder/NoPb Question


Dave

We run trials with folks from ERSA. Actually, due to their knowledge,
erosion of the solderpot, the wave-nozzle, and the pump are considerable.
However, new equipment seem to be produced lead-free save with coated
stainless steel. It seems also as if it is possible to cover the parts in
danger with a organic coating (paint) which can be done during the downtime
when a service is done. The coating needs a refreshment every one or two
years I heard though one line with that coating seems to run now three
years in 24 hours shift without problems. What we also looked at are
upgrade kits for older equipment. I am right now writing a cost-
evaluation.


Guenter


.

EMPA
Swiss Federal Institute for Materials Testing and Research
Centre for Reliability
Dipl. Eng. Guenter Grossmann

8600 Duebendorf
Switzerland

Phone: xx41 1 823 4279
Fax :     xx41 1823 4054
mail:     [log in to unmask]

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