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Does cast iron rust under water? Toller 12-19-2006
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Posted by Toller on December 19, 2006, 2:15 pm


I bought some 45 pound barbell weights at a garage sale to use as a boat
mooring. They are in pretty good shape. I intend to leave them at the
bottom of the lake; will they rust away? I don't care about some surface
rust; I just don't want them to disappear.

If they will rust, I have some epoxy varnish. Presumably there will be no
UV to degrade it; will it prevent the rust? Thanks.

(reading this, it sounds a bit silly; but I am serious)



AppliancePartsPros.com, Inc.
Posted by DK on December 19, 2006, 2:40 pm



>I bought some 45 pound barbell weights at a garage sale to use as a boat
>mooring. They are in pretty good shape. I intend to leave them at the
>bottom of the lake; will they rust away? I don't care about some surface
>rust; I just don't want them to disappear.
>
>If they will rust, I have some epoxy varnish. Presumably there will be no
>UV to degrade it; will it prevent the rust? Thanks.
>
>(reading this, it sounds a bit silly; but I am serious)

If you can keep the oxygen away, then it won't rust, at least, not
very fast.

Unfortunately for you, the water has oxygen in it and it will
'oxidize' very quickly. Those cheap barbells filled with concrete
are okay.




Posted by Charlie Morgan on December 19, 2006, 2:53 pm



>I bought some 45 pound barbell weights at a garage sale to use as a boat
>mooring. They are in pretty good shape. I intend to leave them at the
>bottom of the lake; will they rust away? I don't care about some surface
>rust; I just don't want them to disappear.
>
>If they will rust, I have some epoxy varnish. Presumably there will be no
>UV to degrade it; will it prevent the rust? Thanks.
>
>(reading this, it sounds a bit silly; but I am serious)
>

Not really suitable for this use. Moorings need to be pulled up and
inspected annually anyway. Moorings are usually based on a galvanized
mushroom anchor that is not only very heavy, but works it's way into
the bottom.

CWM

Posted by HeyBub on December 19, 2006, 3:32 pm


Toller wrote:
> I bought some 45 pound barbell weights at a garage sale to use as a
> boat mooring. They are in pretty good shape. I intend to leave them
> at the bottom of the lake; will they rust away? I don't care about
> some surface rust; I just don't want them to disappear.
>
> If they will rust, I have some epoxy varnish. Presumably there will
> be no UV to degrade it; will it prevent the rust? Thanks.
>
> (reading this, it sounds a bit silly; but I am serious)

Yes, they will rust.

Just recently salvers raised a Confederate submarine (sunk during the recent
unplesantness) and it sure enought had some holes in its structure. Of
course the submarine's iron plating was probably thinner than your barbells,
but I wouldn't count on much more than 150 years.



Posted by Toller on December 19, 2006, 3:43 pm



> Toller wrote:
>> I bought some 45 pound barbell weights at a garage sale to use as a
>> boat mooring. They are in pretty good shape. I intend to leave them
>> at the bottom of the lake; will they rust away? I don't care about
>> some surface rust; I just don't want them to disappear.
>>
>> If they will rust, I have some epoxy varnish. Presumably there will
>> be no UV to degrade it; will it prevent the rust? Thanks.
>>
>> (reading this, it sounds a bit silly; but I am serious)
>
> Yes, they will rust.
>
> Just recently salvers raised a Confederate submarine (sunk during the
> recent unplesantness) and it sure enought had some holes in its structure.
> Of course the submarine's iron plating was probably thinner than your
> barbells, but I wouldn't count on much more than 150 years.
Probably not a fair comparison; I expect it was deeper than my 20', and I
further expect that oxygen decreases with depth.



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