Dave,
I have used Ti as a stirrer impellor in the manufacture of tin based
(Sn>90%) whitementals (babbits). At temperatures of around 500C, it
showed no erosion over a year or so, whereas stainless steel rapidly
wore away.
There is no numeric data for this and it was about 10 years ago but,
based on this, I guess Ti would do well, if expensively, as a
wavesoldering construction material.
Roger Bilham
In article <[log in to unmask]
>, [log in to unmask] writes
>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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Roger Bilham
Roger Bilham Consultancy
Tel: +44 (0)20 8467 8819
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Mobile +44 (0)7 941 122 446
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