Experimental investigation of corrosion monitoring on duplex-coated steel utilizing distributed fiber optic sensors

Shuomang Shi; Luyang Xu; Xingyu Wang; Ying Huang

doi:10.1117/12.3010172

9 May 2024 Experimental investigation of corrosion monitoring on duplex-coated steel utilizing distributed fiber optic sensors

Shuomang Shi, Luyang Xu, Xingyu Wang, Ying Huang

Author Affiliations +

Proceedings Volume 12949, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2024; 129491J (2024) https://doi.org/10.1117/12.3010172
Event: SPIE Smart Structures + Nondestructive Evaluation, 2024, Long Beach, California, United States

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Abstract

Civil engineering structures are routinely exposed to corrosive environments, posing threats to their structural integrity. Traditional corrosion control methods often involve employing physical barriers, such as various coatings, to isolate the steel substrate from surrounding electrolytes. Among these methods, thermal spraying of alloy coatings has emerged as a prominent technique in safeguarding steel matrices against corrosion, particularly in industrial and marine settings. However, the inherent porosity of thermal spraying coatings compromises their corrosion resistance. Incorporating a polymer top layer offers a promising solution by sealing pores and augmenting overall performance. This study investigates corrosion on duplex-coated steel utilizing distributed fiber optic sensors based on optical frequency domain reflectometry. Experimental analyses involve embedding serpentine-arranged distributed fiber optic strain sensors within both thermal spraying layers and epoxy layers. Results demonstrate the efficiency of distributed sensors in identifying corrosion propagation paths by measuring the induced strain changes. Furthermore, the duplex coating exhibits significant enhancements in corrosion resistance for steel structures.

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Shuomang Shi, Luyang Xu, Xingyu Wang, and Ying Huang "Experimental investigation of corrosion monitoring on duplex-coated steel utilizing distributed fiber optic sensors", Proc. SPIE 12949, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2024, 129491J (9 May 2024); https://doi.org/10.1117/12.3010172

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