Smart Structures and Systems

  • 제29권2호
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  • Pages.301-309
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  • 2022
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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DOI QR코드

DOI QR Code

Corrosion visualization under organic coating using laser ultrasonic propagation imaging

  • Shi, Anseob (Korea Coating Technology Center, Pukyong National University) ;
  • Park, Jinhwan (Korea Coating Technology Center, Pukyong National University) ;
  • Lee, Heesoo (School of Materials Science and Engineering, Pusan National University) ;
  • Choi, Yunshil (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology) ;
  • Lee, Jung-Ryul (Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology)
  • 투고 : 2021.03.22
  • 심사 : 2021.10.19
  • 발행 : 2022.02.25
⟨ 이전 논문 다음 논문 ⟩

초록

Protective coatings are most widely used anticorrosive structures for steel structures. The corrosion under the coating damages the host material, but this damage is completely hidden. Therefore, a field-applicable under-coating-corrosion visualization method has been desired for a long time. Laser ultrasonic technology has been studied in various fields as an in situ nondestructive inspection method. In this study, a comparative analysis was carried out between a guided-wave ultrasonic propagation imager (UPI) and pulse-echo UPI, which have the potential to be used in the field of under-coating-corrosion management. Both guided-wave UPI and pulse-echo UPI were able to successfully visualize the corrosion. Regarding the field application, the guided-wave UPI performing Q-switch laser scanning and piezoelectric sensing by magnetic attachment exhibited advantages owing to the larger distance and incident angle in the laser measurement than those of the pulse-echo UPI. Regarding the corrosion visualization methods, the combination of adjacent wave subtraction and variable time window amplitude mapping (VTWAM) provided acceptable results for the guided-wave UPI, while VTWAM was sufficient for the pule-echo UPI. In addition, the capability of multiple sensing in a single channel of the guided-wave UPI could improve the field applicability as well as the relatively smaller size of the system. Thus, we propose a guided-wave UPI as a tool for under-coating-corrosion management.

키워드

과제정보

This study was supported by a research grant from the Korea Evaluation Institute of Industrial Technology (20010566).

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