thick. X-ray diffraction indicates
this passivation layer is about 60
percent iron with components of
phosphate, magnesium, silicon, hydrogen and oxygen.
“History suggests that EonCoat’s
passivation layer may resist corro-
sion indefinitely, as demonstrated by
the Iron Pillar of Delhi,” said Wagh.
“The Iron Pillar, a seven-meter high,
six-ton Indian artifact that has resis-
ted corrosion for 1,600 years with
its original inscriptions still legible,
has a virtually identical passivation
layer to that of EonCoat.”
In contrast to typical paint
polymer coatings, which sit on top
of the substrate, EonCoat bonds through a
chemical reaction with the substrate, so
slight surface oxidation actually improves
the reaction. This makes it virtually im-
possible for corrosion promoters like oxy-
gen and humidity to get behind the coating
the way they can with ordinary paints.
After 45 days in a seawater corrosion chamber, the
leading commercial coating (right) is severely corroded, while the EonCoated plate still looks new.
Photo courtesy of EonCoat LLC.
of CBPCs such as EonCoat, for instance, is
now basically making this possible.
“Unlike polymer paints that simply
cover a substrate, CBPCs essentially ‘alloy’
the surface,” said Tony Collins, CEO of
EonCoat LLC, Wilson, N.C.
“When a dual-component spray gun
mixes an acid phosphate with base min-
erals and metal oxides in a water slurry, a
chemical reaction occurs on the surface of
the steel substrate,” said Dr. Arun Wagh,
a former materials engineer at Argonne
National Lab, and lead developer of the
technologies underlying EonCoat ceram-
ics. “A hand-held thermometer indicates a
10-12° F temperature rise, as iron be-
comes a corrosion-resistant passivation
layer of iron oxy hydroxide. Because the
passivation layer is electrochemically sta-
ble, like gold and platinum, it does not
react with corrosion promoters such as
water and oxygen.”
Scanning electron microscopy indicates
this passivation layer is about 20 microns
The corrosion-resistant passivation
layer is further protected by a true ceramic
outer shell. This dense ceramic outer shell
is impermeable to water, and resists im-
pact, abrasion, chemicals and fire. The ce-
ramic outer shell forms simultaneously
with the passivation layer and chemically
bonds with it, after acid and base materi-
als mix in the spray gun nozzle then react
with the substrate surface. The dual-layer
ceramic coating can be used both as a
primer and a topcoat, and can be applied
in a single pass that’s dry to the touch in a
minute, hard dry in 15 minutes and can
be returned to service in an hour.
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Photo courtesy of EonCoat LLC.
www.coatingsworld.com
Coatings World | 33