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Tungsten Carbide does not contain any iron, so it cannot produce anything like ordinary reddish flaky rust. Tungsten does not readily react with oxygen, although it can react with some chlorine compounds.

In practice, end mills or jewelry made of tungsten carbide seem to darken slightly with age, but this does not appear to be progressive or destructive.

Source: http://en.wikipedia.org/wiki/Tungsten_carbide

http://en.wikipedia.org/wiki/Tungsten

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16y ago

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