AB2ZY said:
"...I was wondering what the "magic ingredient" in ATF was that
>> busted rust..."
The factors contributing to ATF's penetrating and antioxidative
performance is due to the additive package, which makes up up 15% of ATF
by volume. Consider that in an AT, there are clutches which must not
slip excessively, and yet they are bathed in ATF. This characteristic
is achieved by a stout surface-tension friction modifier package. The
anti-oxidative package is designed to keep the many aluminum and steel
parts in close proximity from forming dimetallic corrosion cells. In
addition there are detergent and anti-wear packages which contains
molecules structured as micelles, one end which is oliophilic and the
other end is hydrophilic. These molecules have a high affinity for
metal surfaces while remaining suspended in the oil base.
Bottom line: ATF is highly attracted to metal, has corrosion
neutralizers and very low surface tension, and the addition of acetone
as a solvent base to lower the viscosity greatly assists the penetration
of this soup into cracks and crevices. Once it is there is neutralizes
corrosion to a small extent, but also deposits anti-wear agents which
help coat asperities with a film which assists release of the frictional
interface.
We have seen similar results from small amounts (~5%) ZDDP dissolved in
acetone, but I believe the friction modifier in ATF really boosts the
wetting and performance in this application.
Howie - WA4PSC
--
Howard Hoyt - STLE/SAE/STC
Dir. of Engineering
ZPlus, LLC
www.zddplus.com
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