Effectiveness of Products in Managing Metallic Corrosion Induced by Cyclic Deicer Exposure: Laboratory Study Using Multielectrode Array Sensors, Electrochemical Impedance, and Laser Profilometer
Publication: Journal of Materials in Civil Engineering
Volume 28, Issue 5
Abstract
A total of 12 multielectrode array sensors were utilized to assess the individual effectiveness of two corrosion inhibitors and one coating under cyclic deicer exposure conditions. There were four sensor groups, and each group consisted of nine-pin probes that were fabricated from 1008 carbon steel, 304 stainless steel, and 1100 aluminum, respectively. A total of two environmental exposure tests were conducted, in which 2.3% NaCl and 3.0% solutions were used as salt, respectively. The two tests each included eight environmental cycles and with 24 h per cycle. For all the exposed sensors, the most severe corrosion occurred at the beginning of the humidity stage. For sensors in the control group, exhibited a corrosion attack throughout the exposure period, whereas NaCl only exhibited an apparent corrosion attack during the humidity stage. Both the sensor corrosion rates and mass loss results indicate that the inhibitors had a much greater effect for than for NaCl. Although the coating showed significant benefits in protecting the metallic substrates, the cyclic exposure to led to greater coating deterioration than did NaCl. For validation, impedance measurements were conducted on carbon steel panels subjected to similar exposures, and three-dimensional laser profilometer scans were performed to characterize their surface morphology after the exposures.
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Acknowledgments
The research reported herein was financially supported by the Washington Department of Transportation (WSDOT) as well as the Research & Innovative Technology Administration (RITA) at the U.S. Department of Transportation (USDOT) through the Alaska University Transportation Center (AUTC) and Western Transportation Institute. The authors thank all the professionals who provided products for testing and Yan Zhang for his assistance in the laboratory testing. The authors also acknowledge the funding support by the ChuTian Scholar Visiting Professorship Fund provided by the Hubei Department of Education to Wuhan Polytechnic University. The authors neither declare any conflict of interest nor endorse any product or test protocol. The brand names were mentioned for the convenience of the reader only, and the findings are constrained to the investigated conditions and should not be generalized.
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Published In
Journal of Materials in Civil Engineering
Volume 28 • Issue 5 • May 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Dec 22, 2014
Accepted: Aug 11, 2015
Published online: Nov 6, 2015
Discussion open until: Apr 6, 2016
Published in print: May 1, 2016
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