Abstract
The use of anticorrosive coatings has been a powerful method to be applied on the surface of metallic materials to mitigate the corrosive process. In this study, the focus is composite coatings that are commonly used on the internal surface of storage tanks in petrochemical industries. The development of non-destructive methods for inspection of faults in this field is desired due to unhealthy access and mainly because undercoating corrosion is difficult to detect by visual inspection. Pulsed thermography (PT) was employed to detect undercoating corrosion and adhesion loss of anticorrosive composite coatings defects. Additionally, a computational simulation model was developed to complement the PT tests. According to the experimental results, PT was able to detect all types of defects evaluated. The results obtained by computational simulation were compared with experimental ones. Good correlation (similarity) was verified, regarding both the defect detection and thermal behavior, validating the developed model. Additionally, by reconstructing the thermal behavior according to the defect parameters evaluated in the study, it was estimated the limit of the remaining thickness of the defect for which it would be possible to obtain its detection using the pulsed modality.
Highlights
Over decades, the use of protective coatings, both organic and inorganic, has been one of the more versatile techniques for corrosion control
Pulsed Thermography (PT) results are presented in a form of thermogram sequence for each sample, for
Tetrahedral elements were used for the mesh construction and its According to the results presented in Figure 5, all defects inserted in the samples were detected by refinement parameters were chosenS1based onand both processing time of the simulation and
Summary
The use of protective coatings, both organic and inorganic, has been one of the more versatile techniques for corrosion control. Among the non-destructive techniques, thermography has gained great importance in different industry sectors, because it allows the inspection of large areas in a short time and it is able to inspect various types of materials, such as: metals, composites and polymers. Different from other modalities, in pulsed thermography (PT) thermal excitation is used for a short time and its main interest is the monitoring of the thermal evolution on the material surface after heating The result of this modality is presented in the form of a sequence of thermograms and areas of different thermal behavior as compared to the neighborhood can be correlated to the presence of defects [4,7,10,11,12,13]. In this paper, pulsed thermography was employed to detect undercoating corrosion and adhesion loss of commercial anticorrosive coatings It was evaluated the influence of geometry, depth and type of filling of defects with iron oxide in their thermal behavior. A computational simulation model was developed to reproduce the thermal behavior of the defects, allowing the analysis of the influence of the parameters related to the defects in the detection presented by the technique
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