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Open AccessArticle

A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel

1
College of Engineering, Technology, and Computer Science, Indiana University-Purdue University, 2101 E Coliseum Blvd, Fort Wayne, IN 46805, USA
2
Army Engineer Research & Development Center, Construction Engineering Research Laboratory, P.O. Box 9005, Champaign, IL 61826, USA
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Author to whom correspondence should be addressed.
Materials 2014, 7(8), 5746-5760; https://doi.org/10.3390/ma7085746
Received: 18 December 2013 / Revised: 1 August 2014 / Accepted: 4 August 2014 / Published: 8 August 2014
(This article belongs to the Special Issue Corrosion of Materials)
An innovative prototype sensor containing A36 carbon steel as a capacitor was explored to monitor early-stage corrosion. The sensor detected the changes of the surface- rather than the bulk- property and morphology of A36 during corrosion. Thus it was more sensitive than the conventional electrical resistance corrosion sensors. After being soaked in an aerated 0.2 M NaCl solution, the sensor’s normalized electrical resistance (R/R0) decreased continuously from 1.0 to 0.74 with the extent of corrosion. Meanwhile, the sensor’s normalized capacitance (C/C0) increased continuously from 1.0 to 1.46. X-ray diffraction result indicates that the iron rust on A36 had crystals of lepidocrocite and magnetite. View Full-Text
Keywords: carbon steel; chloride; X-ray diffraction; rust; corrosion monitoring carbon steel; chloride; X-ray diffraction; rust; corrosion monitoring
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Chen, D.; Yen, M.; Lin, P.; Groff, S.; Lampo, R.; McInerney, M.; Ryan, J. A Corrosion Sensor for Monitoring the Early-Stage Environmental Corrosion of A36 Carbon Steel. Materials 2014, 7, 5746-5760.

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