marc mularz wrote:

I started my testing of anti-freeze/water ratios on corrosion of an iron
nail last friday morning.  By fri. afternoon when I left work, the distilled
water/nail had already been covered on 50 % of its surface with rust!!! No
sign of corrosion on the other nails yet (10 through 50 % ethylene glycol).
Remember, once the corrosion starts, adding antifreeze may inhibit some
further corrosion but whats there is there and is likely to get worse.  Will
report on the rest of the experiment next week.  I'll also do a quick check
on the specific heat of 50/50 EG and Water this week if anyone is
interested.
Take care,
Marc M

Charlie Kuss wrote:

Any rust layer will act as an insulator and therefore impede thermal transfer. The
only way to remove a rust or oxide layer once initiated, would be to use a cooling
system flush (acid) I would think that a weak antifreeze solution supplemented by a
product like Redline "Water Wetter" would be less trouble than pure distilled
water. (For ground taxi and 1st flight use)
 Better yet, increase system pressure. This will raise the boiling point and
increase the delta temp
Charlie Kuss

 
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