Chemical Engineering August 2020 - 34

Cortec
FIGURE 2. Water-based epoxy coatings of the two-component variety are
often used to coat structural steel
acteristics such as these must be taken
into
protective coating.
Micro-corrosion inhibitor options
Sacrificial metals, such as zincs, chromates
and aluminum, have been commonly
used to create traditional protective
coatings. The relatively large
particle size of these inhibitors, when
considered at the microscopic level,
leaves gaps that allow corrosion to get
a foothold in micro-cavities and spread
more easily from there. An alternative
or supplementary technology to standard
corrosion inhibitors for coatings
are vapor corrosion inhibitors (VCIs),
which typically come in the form of
salts of amine carboxylates. These
corrosion inhibitors have an affinity for
metal surfaces, allowing the inhibitors
to adsorb and form an invisible, protective
molecular layer on the metals.
This molecular barrier blocks the electrochemical
reaction of metal with oxygen
and moisture, inhibiting the flow of
electrons in the normal oxidation-reduction
reaction that would otherwise
cause rust to form.
Because VCIs are relatively smaller
and form a much more continuous layer
32
consideration when choosing a
of protection to line the micro-cavities
of a metal surface,
they are sometimes
called " micro-corrosion inhibiting "
coatings. Combined
with the physical barrier and
sometimes also the sacrificial
metal inhibitor barrier of traditional
coatings, they provide
a double or even triple
barrier against corrosion, as
illustrated in Figure 1 [2].
VCIs have an environmental
advantage in that
they can replace sacrificial
metals, and they have
been used very effectively
to boost the corrosioninhibiting
ability of waterbased
coatings, which
typically benefit from their
lower concentration of volatile
organic compounds
(VOCs) when compared
to solvent-based coatings.
Data suggest that VCIs
also have a synergistic effect
with other inhibitors. For instance,
when VCIs were added to an acrylic
water-based coating containing a
non-zinc metal-complex inhibitor, the
coating showed improved protection
in salt fog testing. The coating blistered
less and there was less corrosion
on the metal surface than occurred
with the coating containing the
metal-complex inhibitor only [3].
VCIs can be used with many different
types of resin systems - both
water-based and solvent-based. In
the harshness of a chemical processCortec
FIGURE
3. A large tank for a weir system at a chemical
processing plant was coated with a VCI water-based
epoxy primer and topcoat for corrosion protection
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Chemical Engineering August 2020

Table of Contents for the Digital Edition of Chemical Engineering August 2020

Contents
Chemical Engineering August 2020 - Cover1
Chemical Engineering August 2020 - Cover2
Chemical Engineering August 2020 - Contents
Chemical Engineering August 2020 - 2
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Chemical Engineering August 2020 - Cover3
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