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Letter 3006
Corrosion resistance of tungsten heavy
metal alloys
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Does anyone have data on corrosion resistance of tungsten heavy
metal alloys (90-95%W, remainder Fe and Ni)? Aerospace standards
frequently call for cadmium plating and or/paint finishing of parts
such as counterweights. Our experience is that corrosion of these
alloys is rare and only occurs under extreme conditions.
Aryeh Asher
- Ashkelon, Israel
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Are you looking for information on the corrosion resistance of
untreated tungsten heavy metal alloys, or for cadmium plated/paint
finishing of these alloys? Under what service conditions?
If some organization has specified cadmium plating for the
application, there is usually a good reason. Cadmium evaporates in
the heat and vacuum of space, so I suppose the cadmium is for some
lubricity or corrosion characteristic at standard temperature and
pressure.
What do you mean by extreme conditions? Unless we know the
application, it is difficult to answer the question.
Regards, tom
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We found out that Tungsten Alloy (95%W-3%Ni-2%Cu) with nickel
electroplating were corroding after going through the damp tests for
about 14 days. What causes the tungsten metal to corrode? Is it due
to insufficient nickel coating that eventually results in corrosion.
Lau shir ling
- Singapore
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