Abstract
Coatings, either soft or hard, are commonly used to protect steel against corrosion for longer service life. With coatings, assessing the corrosion behavior and status of the substrate is challenging without destructive analysis. In this paper, fiber Bragg (FBG) grating sensors were proposed to nondestructively evaluate the corrosion behavior of steel coated with two popular coatings, including the polymeric and wire arc sprayed Al-Zn coating. Laboratory accelerated corrosion tests demonstrated that the embedded FBG sensors inside both the soft and hard coatings can effectively quantify the corrosion rate, monitor the corrosion progress, and detect the coating damages and crack propagation of coated steel in real time. The laboratory electrochemical corrosion test on the wire arc sprayed Al-Zn coating validated the proposed embedded FBG sensor method with a good agreement in comparison. The proposed sensing platform provides an alternative nondestructive real-time corrosion assessment approach for coated steel in the field.
Highlights
Steel is popularly used in modern structures such as bridges, buildings, and pipes, which is vulnerable to corrosion attacks [1,2,3,4,5,6]
The validated technique presented in this paper provides onsite real-time monitoring tools to assess corrosion behavior of coated steel
For the first time, corrosion behavior was evaluated for steel coated by polymeric coating and wire arc sprayed Al-Zn coatings using embedded fiber Bragg (FBG) sensors
Summary
Steel is popularly used in modern structures such as bridges, buildings, and pipes, which is vulnerable to corrosion attacks [1,2,3,4,5,6]. If the corrosion reaction happens in a confined space, the excessive increased volume would induce a noticeable amount of strain, which could be used as an indicator of the corrosion reaction Based on these principles, recently, electrical resistance sensors have been investigated to detect metallic and organic coating degradations [31,32]. For the first time to the authors’ acknowledge, FBG sensors were investigated to assess corrosion behavior in real time of steel components coated with two different popularly applied commercial coatings: The polymeric coating and the wire arc sprayed Al-Zn coatings. This paper set up the direct relation between the center wavelength changes of embedded FBG sensors and the corrosion progress changes in addition to the corrosion induced crack/delamination initialization inside the polymeric and wire arc sprayed coatings. The validated technique presented in this paper provides onsite real-time monitoring tools to assess corrosion behavior of coated steel
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
