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I've disassembled and gone through a few hundred used mags the past year and have never seen more than a surface rust, no pitting or rust through. Just a little rust that you could basically just scrape off with your thumbnail. Maybe I just haven't seen a bad one yet??
I'm sure if the CS spring was exposed to salt water, they'd rust more ... but I haven't seen it.
Magpul, Brownell's, and NHMTG use SS springs in their current mags. It looks like the new USGI mags all have SS Springs. A new mil-spec?
It depends on what grade SS they use, but some grades of SS will rust like crazy if exposed to salt water?
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