Non‐destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography

Schönberger, Andreas; Virtanen, Sannakaisa; Giese, V.; Schröttner, Hartmuth; Spiessberger, Christian

doi:10.1002/maco.201005918

Cited by 9 publications

(4 citation statements)

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“…The vibrothermography method requires contact; therefore, they are commonly used for post-construction structural inspections [28]. There are other methods such as pulsed phase thermography [29], phased array [30], and thermographic signal reconstruction [31] that have not been used for weld inspection, but have shown promises in other materials. Using either passive or active techniques, the presence of a defect causes an anomaly in the response of the inspected specimen.…”

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Infrared Thermography for Weld Inspection: Feasibility and Application

2018

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Traditional ultrasonic testing (UT) techniques have been widely used to detect surface and sub-surface defects of welds. UT inspection is a contact method which burdens the manufacturer by storing hot specimens for inspection when the material is cool. Additionally, UT is only valid for 5 mm specimens or thicker and requires a highly skilled operator to perform the inspections and interpret the signals. Infrared thermography (IRT) has the potential to be implemented for weld inspections due to its non-contact nature. In this study, the feasibility of using IRT to overcome the limitations of UT inspection is investigated to detect inclusion, porosity, cracking, and lack of fusion in 38 weld specimens with thicknesses of 3, 8 and 13 mm. UT inspection was also performed to locate regions containing defects in the 8 mm and 13 mm specimens. Results showed that regions diagnosed with defects by the UT inspection lost heat faster than the sound weld. The IRT method was applied to six 3 mm specimens to detect their defects and successfully detected lack of fusion in one of them. All specimens were cut at the locations indicated by UT and IRT methods which proved the presence of a defect in 86% of the specimens. Despite the agreement with the UT inspection, the proposed IRT method had limited success in locating the defects in the 8 mm specimens. To fully implement in-line IRT-based weld inspections more investigations are required.

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Infrared Thermography for Weld Inspection: Feasibility and Application

2018

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“…22 Similarly, pulsed phase thermography (PPT) is a non-destructive tool that can be used to analyze inhomogeneities and defects in the films of coated metals. 23 Recent work presented in the literature has demonstrated the potential of PPT to detect the propagation of corrosion under coatings. 23 Although non-quantitative, PPT has demonstrated the capability to detect corrosion and delamination on steel and galvanized steel panels coated with organic paint.…”

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“…23 Recent work presented in the literature has demonstrated the potential of PPT to detect the propagation of corrosion under coatings. 23 Although non-quantitative, PPT has demonstrated the capability to detect corrosion and delamination on steel and galvanized steel panels coated with organic paint. 23 Fiber optic sensors have been used for the detection of corrosion at a large scale.…”

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“…23 Although non-quantitative, PPT has demonstrated the capability to detect corrosion and delamination on steel and galvanized steel panels coated with organic paint. 23 Fiber optic sensors have been used for the detection of corrosion at a large scale. 24 Fuhr and Hutson embedded multiple-parameter sensing fiber optic sensors into steel reinforced concrete samples.…”

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Development of a Quantitative High Throughput Method for the Early Detection of Corrosion on Coated Aluminum

Foster¹

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Development of a Quantitative High Throughput Method for the Early Detection of Corrosion on Coated AluminumJeffrey Clayton Foster Eight fluorescent indicators were evaluated for their ability to detect the corrosion of aluminum metal substrates. The fluorophore Rhodamine-salicylaldehyde (RSA) was selected as a candidate for further study based on its ability to bind and detect aluminum ions at low concentrations, its selectivity for aluminum ions, its long-term stability, its solubility in our solvent-based epoxy formulation, and its compatibility with our testing method.A recent publication suggested that an alternative method of fluorescence activation was possible-an acid-promoted ring opening that occurred in the absence of metal ions. To prove the capability of RSA to bind aluminum ions, thorough 1 H and 27 Al nuclear magnetic resonance spectroscopy, mass spectrometry, and fluorescence analysis was conducted. It was found that RSA bound aluminum ions, with a preferred binding stoichiometry of 2:1 RSA/Al.Long-term immersion and salt spray corrosion studies were conducted to investigate the ability of RSA to detect corrosion on aluminum substrates. Aluminum panels were coated with epoxy coatings that contained the fluorescent indicator.Following optimization, a linear relationship between corroded area and time of immersion/exposure to salt fog was observed.

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Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

Kopf

Tighe

2022

Materials & Corrosion

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Corrosion of metals can occur under coatings making early visual detection almost impossible which enables corrosion to progress undetected. Nondestructive evaluation can be used to inspect parts during their life. Thermography uses the difference in thermal properties between defective and sound areas to locate defects by applying a short pulse of heat and monitoring the surface temperature of the sample with an infrared camera. However, currently, inspection is reliant on highly trained operators to analyze images for defects and in the case of corrosion, judge its growth. The aim of this research was to develop and test a novel algorithm to identify and quantify the onset of corrosion under coatings and monitor the growth. Using this algorithm, the corrosion was autonomously detected in a variety of mild steel samples exposed to three different corrosive environments. The method successfully detected, quantified, and monitored the growth of corrosion under coatings accurately and robustly using thermal images gathered by a microbolometer infrared camera. The extent of corrosion was reported with an accuracy of 3% absolute error when compared to the true extent.

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Non‐destructive detection of corrosion applied to steel and galvanized steel coated with organic paints by the pulsed phase thermography

Cited by 9 publications

References 8 publications

Infrared Thermography for Weld Inspection: Feasibility and Application

Infrared Thermography for Weld Inspection: Feasibility and Application

Development of a Quantitative High Throughput Method for the Early Detection of Corrosion on Coated Aluminum

Automated detection and quantification of the onset of undercoating corrosion using pulsed thermography

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