Electrochemical Characterization of Steel Bridge Welds under Simulated Durability Test
Publication: Journal of Bridge Engineering
Volume 23, Issue 10
Abstract
Ever increasingly, corrosion-induced steel bridge deterioration, particularly near or at the welded joints, has led to a huge economic burden in the United States. There is, however, no sufficient information about weldment corrosion in steel bridges, which has hindered the application of appropriate corrosion mitigation. This study is to better understand corrosion behavior of steel bridge welds. Investigation of weldment corrosion of commonly used bridge steels, the low-carbon iron steel, and weathering steel, was performed using four electrochemical tests under simulated corrosive environments. Two coating systems, organic zinc-rich three-coat system and one-coat calcium sulfonate alkyd (CSA), were deposited to the samples to determine their performance at weldment. Results revealed that bridge welds exhibit higher corrosion initiation over base metals, regardless of types of steel or coating. In addition, the weathering steel shows the higher resistance to corrosion initiation (twice as high) in welded area as compared to the low-carbon iron steel. Moreover, the protective coating can effectively delay the corrosion initiation at the welds, thus enhancing the corrosion resistance of bridge welds.
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Acknowledgments
The authors gratefully acknowledge the financial support provided by NDDOC, Ozbun Economic Development Award, USDOT (FAR0025913) and USDOT Pipeline and Hazardous Materials Safety Administration (FAR0025626). The authors also appreciate the donation of bridge steel by Contech Engineered Solution LLC, Watson Coating, Inc. for CSA coating samples, Pacific Painting Company, and the North Dakota DOT for three-coat samples. Any results, discussion, recommendations, and opinions reflected in this paper are those of the authors only and do not necessarily represent those donors.
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© 2018 American Society of Civil Engineers.
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Received: Dec 12, 2016
Accepted: Dec 28, 2017
Published online: Jul 18, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 18, 2018
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