Yes, salt water is more corrosive...but crevice corrosion can still do a serious number on stainless steel in fresh water.
Doesn't it make a difference if the boat is in salt water? Salt water being much more corrosive than fresh? As an example, I've retrieved steel parts that have been at the bottom of a lake (fresh water) for more than 30 years and there was very little damage, other than cosmetic, and they were still sound. Walking around our marina last fall after haul out, I noticed about half the keels have some weeping streaks. We sail in fresh water and there is very little talk of potential problems. I would like to hear others opinions on this issue because one of the weepers was ours. Bog
Parts that are sitting on the bottom of the lake, if the lake is deep enough, are below the thermocline, and the water there is both very cold and very low in oxygen content. As such, it generally doesn't allow rust to progress, due to the near complete lack of oxygen.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.