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steel drum MTF - Page 2

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Posted by daestrom on December 11, 2004, 9:34 pm
 


Gee, corrosion of steel in water is pretty variable.  They could last quite
a few years, or less than one.  A good rust-inhibitor would be useful
(assuming you never want to drink the water).  Maybe some automotive store
would have something?

Another important thing is to keep them sealed.  Once the oxygen in them is
consumed rusting the inner surface, corrosion slows down if there is no more
free oxygen.  But if they are vented for expansion and they keep 'breathing'
in/out fresh air as they cool/heat, then the oxygen supply is replenished
and corrosion goes at a much higher rate.

daestrom



Posted by bherms on December 11, 2004, 10:02 pm
 
On Sat, 11 Dec 2004 21:34:10 GMT, "daestrom"


very good to know ... I'll add some rust inhibitor and seal them up
... they should last to infinity ... and beyond  :)  I wondered about
that oxygenation thing,  I mean, does the rest of the water turn to
hydrogen?  (my 1.5 semesters as a chemistry major leaves me with many
more questions than answers)   I guess a little air in the top will
allow for expansion, and I can deal with some drum popping noises
occasionally.  My drums had some various oil based chemicals in them
originally, and I left some in for protection.  I see "black oil" on
one from where I sit.  What other colors are available?  :)  



Posted by daestrom on December 12, 2004, 2:53 pm
 

Corrosion of ferrous materials has been studied ad-naeseum in the industrial
world.  The choice of exact materials goes a long way, but as you already
have the drums, that's pretty much a moot point.  In an oxygen rich
environment, corrosion leads to the familar red rust that flakes and exposes
new metal underneath.  But with low oxygen, corrosion takes the form of
'black gamma hematite', a black oxide layer that binds tightly to the
material and protects the material underneath it (somewhat like the oxide
layer formed on bare aluminum).

I guess a little air in the top will

Well, for colors, you might try a dash of the pink/green/yellow versions of
automotive antifreeze.  Over the counter automotive antifreeze has several
'rust inhibitors' in it.

daestrom



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