Rusting is not the same thing (well it is technically, but that's another matter). Few of these rust in the traditional sense, but all will be affected. Look at the composition of VG-10 and you'll see why it isn't significantly more corrosion resistant than the others, just a wee bit better. The composition elements don't lie. Fact: stick any of these in salt water and they will all give evidence of corrosion to one degree or another, which was the question. It is all a matter of degree.