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DACCO SCI, INC. Corrosion Engineering · Materials Technology · Electrochemistry |
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DACCO SCI, INC. Corrosion Engineering · Materials Technology · Electrochemistry |
DACCO SCI, INC., provides corrosion engineering services from pre-design through construction and lifetime inspection. Services include:
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Systems and structures benefiting from DACCO SCI's corrosion engineering include:
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DACCO SCI, INC., has developed a series of in-situ corrosion sensors, based on electrochemical impedance spectroscopy (EIS), that allow coating degradation and substrate corrosion to be tracked from the very early stages. Because the sensor monitors the condition of the actual structure of interest, as opposed to monitoring the corrosivity of the environment, it is ideally suited for condition-based maintenance and coating development. Direct comparisons are possible between degradation occurring in accelerated testing and ambient service conditions.
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Painted sensors (left) are well suited for taking
in-situ
measurements of panels in salt fog or other accelerated test chambers.
Both painted and handheld/pad (insert, right) sensors are appropriate for atmospheric or ambient/service exposures. |
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Advantages of the DACCO SCI sensor over competing technologies include:
Sensor directly measures coating degradation and substrate corrosion on the structure of interest.
Sensor detects early stages of degradation before serious damage or loss of structural integrity.
Sensor is suitable for a wide range of environments, including ambient field conditions and accelerated testing.
Sensor is suitable for a one-time measurement; it does not have to be left in place in order for the sensor itself to degrade.
Painted sensor can be mounted in inaccessible regions.
Handheld sensor is pressed against the surface for short periods of time only.
Range of detection is controllable.
Sensor is also suitable for moisture detection in composites and adhesive bonds.
More information about the sensors can be obtained from the following papers:
In-Situ Corrosion Sensor Overview
Electrochemical In-Situ Sensors for Detecting Corrosion on Aging Aircraft, Proc. Intelligent NDE Sciences for Aging and Futuristic Aircraft, ed. C. Ferregut, R. Osegueda, and A. Nuñez, (University of Texas, El Paso, TX, 1998), p. 141.
Development of an Electrochemistry-Based Corrosion Sensor to Monitor Corrosion of Boiler Tubes, Pipes, and Painted Structures, Nondestructive Evaluation of Utilities and Pipelines II, W.G. Reuter, ed., Proc. SPIE Vol. 3398, (Society for Photo-optical Instrumentation Engineers, Bellingham, WA, 1998), p. 92.
Detection of Moisture in Composites Using an Electrochemical Impedance Spectroscopy Sensor, Proc. 3rd Joint FAA/DOD/NASA Conference on Aging Aircraft (Albuquerque, NM, September 1999).
"In-Situ Sensor to Detect Moisture Intrusion and Degradation of Coatings, Composites, and Adhesive Bonds," Proc. 1999 Tri-Services Conference on Corrosion (Myrtle Beach, SC, 1999). A modified version of this paper is available on the on-line Corrosion Doctors Journal 2000.
DACCO SCI, INC., has recently teamed with Inhibitrol to investigate the use of plant-derived materials as environmentally acceptable corrosion inhibitors. Results have shown that extracts from tobacco plants can be more effective than chromates at reducing corrosion rates but without the toxicity and environmental impact of chromates. For more information, click here.
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Corrosion Sensors | Plant-Based Inhibitors | Field Activities | Importance of Corrosion | ||
| C.M. Dacres | G.D. Davis |
DACCO SCI, INC. ¤
10260 Old Columbia Road ¤
Columbia, MD 21046
(410) 381-9475 (Baltimore) ¤
(301) 596-7019 (Washington) ¤
(410) 381-9643 FAX
dacres@daccosci.com
(Chester Dacres)
davis@daccosci.com
(Guy Davis)
©
1999, 2000, 2001, 2002 DACCO SCI, INC.
Please send any comments to dacres@daccosci.com
06 May, 2005
