Well, with that said I'm sure we can all now agree that whatever the core material may be, it has nothing to do with the steel covers rusting. :D
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I'm sorry but that's überkool, perfect for a steampunk build. :up:
The key point is that ferrite can't rust! I too am not sure of the negative effects of rusted chokes, but I certainly wouldn't buy a rusty car or a rusty gardening tool. Although, my gardening tools are all a little rusty now and even my car has rust after years of use. You just don't expect to buy a new product only to find rust!