Eddy current and inspection of coatings for storage tanks

Marcella Grosso; Clara J. Pacheco; Mónica P. Arenas; Andre H. Mascarenhas Lima; Isabel C.P. Margarit-Mattos; Sergio Damasceno Soares; Gabriela R. Pereira

Journal of Materials Research and Technology (Jul 2018)

Eddy current and inspection of coatings for storage tanks

Marcella Grosso,
Clara J. Pacheco,
Mónica P. Arenas,
Andre H. Mascarenhas Lima,
Isabel C.P. Margarit-Mattos,
Sergio Damasceno Soares,
Gabriela R. Pereira

Affiliations

Marcella Grosso: Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-972 Rio de Janeiro, RJ, Brazil; Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil; Corresponding author.
Clara J. Pacheco: Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil
Mónica P. Arenas: Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-972 Rio de Janeiro, RJ, Brazil; Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil
Andre H. Mascarenhas Lima: Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil
Isabel C.P. Margarit-Mattos: Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-972 Rio de Janeiro, RJ, Brazil; Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil
Sergio Damasceno Soares: Petrobras Research Center (CENPES), 21040-000 Rio de Janeiro, RJ, Brazil
Gabriela R. Pereira: Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-972 Rio de Janeiro, RJ, Brazil; Laboratory of Nondestructive Testing, Corrosion and Welding (LNDC), Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-596 Rio de Janeiro, RJ, Brazil

Journal volume & issue: Vol. 7, no. 3
pp. 356 – 360

Abstract

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The aim of this work is to make a survey of typical flaws presented by modern anticorrosive coatings commonly employed for inside protection of petrochemicals storage tanks and discuss what can be expected from nondestructive inspection with conventional eddy current technique. In this sense, advantages and limitations of the method are discussed taking into account the characteristics of the coatings. Controlled defects were machined in carbon steel substrates in order to simulate localized corrosion. The detectability of the eddy current technique was evaluated for as-applied insulating coatings (with different thicknesses) in presence and absence of iron oxide inside the simulated corrosion defects. Comparing the results obtained with the original C-Scan maps and after the image processing, the machined defects were successfully detected. In this comparison, it was observed a significant improvement for the false defects elimination using image processing. Keywords: Eddy current testing, Coatings, Corrosion, Underfilm corrosion, Pitting

Published in Journal of Materials Research and Technology

ISSN: 2238-7854 (Print); 2214-0697 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Mining engineering. Metallurgy
Website: https://www.journals.elsevier.com/journal-of-materials-research-and-technology/

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