???????

The OP's question was about corrosion of iron in low orbit versus at sea level.

Nothing was said - by the OP - about for what the iron was being used.

Satellites entered the discussion because they are the subject of the only near-space corrosion investigations for which anyone could find ready (e.g. online) reference.

I don't recall any mention of ships at all (other than perhaps in your own posts, which I frankly didn't bother to read in full).