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Characterisation and evaluation of paint-coated marine corrosion in carbon steel using eddy current pulsed thermography

Lookup NU author(s): Professor Gui Yun TianORCiD, Xiaotian Chen

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Abstract

© 2022 Elsevier LtdMarine atmospheric corrosion is a major challenge for carbon steel. Eddy current pulsed thermography (ECPT) can characterise defects under coating, but it is necessary to consider samples' surface geometry. This paper proposes a statistical approach for paint-coated S275 steel corrosion evaluation based on ECPT. The thermal response curve skewness of each point is utilised to reveal the corrosion region. The normalised skewness avoids the influence of emissivity anisotropy and surface geometry; corrosion can be evaluated by taking excitation coil skewness as a reference. In the results, the differential skewness drops monotonously with corrosion aggravation in 6 months, decreasing more than 90% from the uncorroded zone to the 3-month corrosion sample. The approach provides high sensitivity and detectability in paint-coated corrosion evaluation.

Publication metadata

Author(s): Ding S, Tian G, Zhu J, Chen X, Wang Y, Chen Y

Publication type: Article

Publication status: Published

Journal: NDT & E International

Year: 2022

Volume: 130

Print publication date: 01/09/2022

Online publication date: 28/05/2022

Acceptance date: 25/05/2022

ISSN (electronic): 0963-8695

Publisher: Elsevier Ltd

URL: https://doi.org/10.1016/j.ndteint.2022.102678

DOI: 10.1016/j.ndteint.2022.102678

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