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Smart Structures and Systems Volume 29, Number 2, February 2022 , pages 301-309 DOI: https://doi.org/10.12989/sss.2022.29.2.301 |
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Corrosion visualization under organic coating using laser ultrasonic propagation imaging |
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Anseob Shin, Jinhwan Park, Heesoo Lee, Yunshil Choi and Jung-Ryul Lee
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| Abstract | ||
| 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 undercoating- corrosion management. | ||
| Key Words | ||
| coating; corrosion visualization; G-UPI (Guided wave- Ultrasonic Propagation Imager); nondestructive; PE-UPI (Pulse-Echo Ultrasonic propagation Imager) | ||
| Address | ||
| (1) Anseob Shin, Jinhwan Park: Korea Coating Technology Center, Pukyong National University, Busan, Republic of Korea; (2) Anseob Shin: School of Convergence Science, Pusan National University, Busan, Republic of Korea; (3) Jinhwan Park: Department of Industrial Chemistry, Pukyong National University, Busan, Republic of Korea; (4) Heesoo Lee: School of Materials Science and Engineering, Pusan National University, Busan, Republic of Korea; (5) Yunshil Choi, Jung-Ryul Lee: Department of Aerospace Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea. | ||