We started the discussion off-list, but the first question Doug asked was - What sort of corrosion would you have in space?
If he asks - Would a sheet of iron rust in a near earth orbit, the suggestion that sheet iron is used in satellite construction should not enter the discussion at all AFAIK

If you don't have the answer, don't give a "near enough is good enough" one, because in space, that will kill you and everyone around you.

On 2 January 2016 at 20:06, Richard Aiken <xxxxxx@gmail.com> wrote:
On Sat, Jan 2, 2016 at 12:14 AM, Greg Chalik <mrg3105@gmail.com> wrote:
The question was about the utility of iron in building ships for space travel, not utility of iron in orbital satellites.

???????

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). 

--
Richard Aiken

"Never insult anyone by accident."  Robert A. Heinlein
"A word to the wise ain't necessary -- it's the stupid ones that need the advice." - Bill Cosby
"We know a little about a lot of things; just enough to make us dangerous." Dean Winchester
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