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Re: [TowerTalk] WD-40

To: towertalk@contesting.com
Subject: Re: [TowerTalk] WD-40
From: Howard Hoyt <tech@zddplus.com>
Date: Tue, 14 Apr 2015 00:02:46 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
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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