AMT_June-July_2021 - 11
contamination at bay and reduces the risk
of corrosion.
Why Does it Happen?
Corrosion acts as a battery and requires
an electrolyte, or a liquid path like water,
to flow electrons - metallic substrate -
from an active, anodic substrate, like aluminum,
magnesium and zinc, and to a noble,
cathodic substrate, like titanium, stainless
steel, copper and chrome. The removal of
one of these conditions will stop or prevent
corrosion. " If we understand that having
anodic and cathodic substrates may be part
of design, it's important for us to ensure
that there's an electrical barrier between
these dissimilar metals and electrolytes
are not present, " Hayes stated. " Paint is an
effective treatment in that it can provides
an electrical barrier, like wet installation of
fasteners, and it acts as a water-impervious
sealant for electrolyte barrier. "
The type of preventative maintenance
depends on the part of the aircraft. Some
typical preventative maintenance measures
include removal of existing corrosion, creating
barriers by the reapplication of lubrication
and greases, reapplication of corrosion
inhibiting compounds and touching
up areas with missing primer or paint, as
well as removing any " standing " water by
ensuring all drainage holes remain free and
clear of blockage, etc.
What to Do?
" Disconnect the theoretical battery, " Hayes
said. Using the principles noted above to
remove the ability for corrosion to form is
the only method to prevent corrosion. If
corrosion is present, it needs to be removed
without compromising structural integrity.
" Once the corrosion has been removed, the
area needs to be thoroughly cleaned using an
appropriate solvent or alkaline-based cleaner, "
she noted. " Once the area has been thoroughly
washed and dried, an applicationspecific
barrier needs to be put in place such
as a conversion coating, primer and paint,
lubricant, grease or corrosion inhibitor.
New Aircraft
Hayes says with the issuance of AC 43-4
Corrosion Control of Aircrafts, there has
AviationPros.com/company/21216063
www.AviationPros.com 11
been a huge movement in the aerospace
industry to ensure robust corrosion protection
within design. At Piper Aircraft, each
design is carefully reviewed to ensure that
an application-specific corrosion protection
is specified. For example, during production,
aluminum and carbon steel detail
parts are protected from interim corrosion
using lubricants and corrosion inhibitors,
then either primed using an anticorrosive,
chromated epoxy primer, conversion coated
using a trivalent chromium conversion
coating, aluminum only, phosphatized,
steel only, then top coated - if applicable.
http://www.rohnerspraybooths.com
http://www.AviationPros.com/company/21216063
http://www.AviationPros.com
AMT_June-July_2021
Table of Contents for the Digital Edition of AMT_June-July_2021
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