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Degradation Sensor (CDS)
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SwRI Information
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Coating
degradation sensor element with integrated data acquisition
and wireless communication electronics |
To protect engineered structures from corrosion and environmental
attack, protective measures are taken with paint, temporary coatings
corrosion preventative compounds (CPCs), tape coatings or appliqués,
which form an insulating, inert and impervious protective layer on the
alloy surface.
Degradation of these coatings through the adsorption of water, coating
damage, defects, and weathering can lead to reduced protection,
corrosion and ultimately loss of structural integrity. Monitoring the
condition of the protective coating can provide information to trigger
maintenance actions and prevent corrosion of the engineered structure.
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Coating degradation sensor performance
for aluminum alloys |
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Coating degradation sensor performance
for carbon steel with and without coating defects |
Key Features of the
Coating Degradation Sensor
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U.S. Patent No. 6,911,828
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Detection of changes in coating performance such
as water uptake and environmental degradation of the coating
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Sensitivity to coating defects such as thin
spots and fisheyes
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Detection of mechanical damage
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Sensor can be embedded in the structure to
detect changes in coating performance prior to onset of corrosion
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Field evaluation of protective coatings
Field Deployable
Sensor Network
A field deployable sensor network capability has been developed by
Southwest Research Institute (SwRI) to
actively evaluate the condition of protective coatings used to prevent
corrosion and structural damage.
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Automatic connection to system when sensors are
in range of a wireless system
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Base station reconnects to cell phone network in
the event of power interruption
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Sensors store data when out of range of the
network and upload data when network is in range
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Assets can be used and do not have to remain
stationary or in storage
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Sensor packages are water resistant and designed
to withstand impacts
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Field deployed reader node |
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Deployed coating degradation sensor on
water tank trailer |
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System schematic showing sensor nodes
that collect data and transmit through reader nodes to a
base station where data is uploaded to a web portal |
For more information about the coating degradation sensor (CDS)
capabilities at SwRI or how you can contract with SwRI, please contact
Garth
Tormoen at
gtormoen@swri.org or (210) 522-2645, or
Elizabeth Trillo, Ph.D., at
etrillo@swri.org or (210) 522-4210.
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Southwest Research Institute® (SwRI®), headquartered
in San Antonio, Texas, is a multidisciplinary, independent, nonprofit, applied
engineering and physical sciences research and development organization with 11
technical divisions.
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