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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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Tom PullizziFalls Township, Pennsylvania |
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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