PROGRESSIVE EPOXY
POLYMERS, INC.
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EPOXY PAINT - ZINC PRIMERS
Zinc Primer
Info Page
Zinc rich primers are used
to protect steel surfaces from corrosion.
Unlike regular paints or epoxies which
resist corrosion by forming
an impermeable barrier between the metal and
atmospheric moisture,
zinc rich primers provide corrosion protection by
electrical means.
- RECOMMENDED: replace with an
aluminum filled moisture cured (MCU)
primer -
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Paul Oman, MS, MBA - Progressive Epoxy Polymers,
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(floor epoxies,
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Member: NACE (National Assoc. of
Corrosion Engineers), SSPC (Soc. of Protective Coatings)
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How Zinc Primers Work
Zinc rich primers are used to protect steel surfaces from corrosion. Unlike
regular paints or epoxies which resist corrosion by forming an impermeable
barrier between the metal and atmospheric moisture, zinc rich primers provide
corrosion protection by electrical means. The zinc and the steel for a tiny
electrical - cathodic cell that protects the steel at the expense of the zinc.
Of course the zinc primer also provides a little ‘barrier' protection as well.
Why Use Them
Some types of zinc rich primers (inorganic - see below) are used as a stand
alone coating, but often they are top coated with a paint or epoxy (many
industrial coating specifications call for a zinc primer, epoxy intermediate
coat and a urethane topcoat - we offer such a system as well - CLICK HERE for
more information). A zinc primer under a topcoat of epoxy or urethane paint
provides a backup or secondary method of protecting the steel from corrosion..
Although epoxies can, and often are, used successfully on steel surfaces without
any sort of general purpose primer or zinc primer.
Organic vs. Inorganic Zinc Primers
There are two types of zinc primers, organic and inorganic. Generally inorganic
primers must be spray applied. They do not have to be top coated and provide
better steel protection than non-top coated organic zinc primers.
Organic zinc primers (often zinc in an epoxy) can generally be applied by brush,
roller or spray. If not top coated they do not protect the steel as well as an
inorganic primer, but tests show they do offer the same degree of protection if
the primers are top coated.
A new flavor of organic zinc primer is a moisture cured urethane zinc primer.
Moisture cured urethane (MCU) coatings are easier to apply and work with than
epoxy based organic zinc primers and are one component (one pack) products, not
counting the zinc powder which must be added into the epoxy or MCU. Pricing of
organic and inorganic zinc primers are all similar. The zinc rich primer we
offer is a moisture cured urethane.
Our Recommendation for Coating Steel
Surfaces.
Perhaps the best system for coating steel is as
follows:
1) Abrasive blast new steel. Old steel should be abrasive blasted or waterjetted
down to ‘white' metal. The initial abrasive blast gives a metal a surface
profile which is very important for a good coating bond.
2) Treat with a soluble/insoluble salt remover. (We do not carry this kind of
product). This is becoming more recognized as an important pre-coating step.
3) A primer.
We no longer offer a zinc
primer. Instead, we suggest our aluminum filled, moisture cured urethane,
Aluthane (tm) -
Click Here
for more info (EPOXY PRIMER TOO!
Click Here)
Progressive Epoxy Polymers, Inc. Pittsfield, NH
03263 - 603-435-7199 -
email
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