Journal of Materials Research and Technology Journal of Materials Research and Technology
J Mater Res Technol 2018;7:356-60 DOI: 10.1016/j.jmrt.2018.05.006
Original Article
Eddy current and inspection of coatings for storage tanks
Marcella Grossoa,b,, , Clara J. Pachecob, Mónica P. Arenasa,b, Andre H. Mascarenhas Limab, Isabel C.P. Margarit-Mattosa,b, Sergio Damasceno Soaresc, Gabriela R. Pereiraa,b
a Department of Metallurgical and Materials Engineering, Federal University of Rio de Janeiro (UFRJ), Polytechnic School and COPPE, 21941-972 Rio de Janeiro, RJ, Brazil
b 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
c Petrobras Research Center (CENPES), 21040-000 Rio de Janeiro, RJ, Brazil
Received 17 November 2017, Accepted 02 May 2018
Abstract

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
J Mater Res Technol 2018;7:356-60 DOI: 10.1016/j.jmrt.2018.05.006
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