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Publication . Article . 2022

Non-Invasive Evaluation of Polymeric Protective Coatings for Metal Surfaces of Cultural Heritage Objects: Comparison of Optical and Electromagnetic Methods

Diego Quintero Balbas; Alice Dal Fovo; Daniela Porcu; Antonina Chaban; Simone Porcinai; Raffaella Fontana; Jana Striova;
Open Access
Published: 27 Jul 2022 Journal: Applied Sciences; Volume 12; Issue 15; Pages: 7532 (issn: 2076-3417, Copyright policy )
Publisher: Multidisciplinary Digital Publishing Institute
Country: Italy

The application of protective coatings is an effective preventive strategy to avoid metal corrosion. Constant monitoring of the coating’s quality is fundamental for the successful preservation of the metallic objects by reducing their interaction with corroding agents. Their evaluation over time helps to identify failure at early stages and promote their removal and substitution. Several methods have been employed for coating evaluation (i.e., chemical analysis, thickness and homogeneity investigation). In this paper, we compare three methods—Optical Coherence Tomography (OCT), Confocal Raman Microspectroscopy (CRM), and Eddy Currents (ECs)—to evaluate thickness values and coating integrity. The results from the two optical techniques (CRM and OCT) agree, being able to detect the inhomogeneity of the layer on a micron scale but requiring correction to account for the refraction phenomenon. The Eddy Current is a fast and efficient method for thickness estimation, providing data with millimetric lateral resolution.


protective coatings; cultural heritage; OCT; Confocal Raman; Eddy Current; metallic surfaces, Fluid Flow and Transfer Processes, Computer Science Applications, Process Chemistry and Technology, General Engineering, Instrumentation, General Materials Science, protective coatings, cultural heritage, OCT, Confocal Raman, Eddy Current, metallic surfaces, protective coatings, cultural heritage, OCT, Confocal Raman, Eddy Current, metallic surfaces

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