Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing

Syasko, Vladimir; Musikhin, Alexey; Gnivush, Igor; Stepanova, Maria; Vinogradova, Anna

doi:10.3390/coatings16060648

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Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing

by

Vladimir Syasko

¹,

Alexey Musikhin

²,

Igor Gnivush

^3,*,

Maria Stepanova

¹ and

Anna Vinogradova

³

¹

D.I. Mendeleev Institute for Metrology (VNIIM), Moskovsky Ave, 19, 190005 St. Petersburg, Russia

²

LLC “KONSTANTA”, Ogorodny Lane, 21, 198095 St. Petersburg, Russia

³

Faculty of Mechanical Engineering, Empress Catherine II Saint Petersburg Mining University, 21st Line, 2, 199106 St. Petersburg, Russia

^*

Author to whom correspondence should be addressed.

Coatings 2026, 16(6), 648; https://doi.org/10.3390/coatings16060648

Submission received: 15 April 2026 / Revised: 19 May 2026 / Accepted: 24 May 2026 / Published: 26 May 2026

(This article belongs to the Section Composite Coatings)

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Abstract

This study assesses the possibility of identifying non-through defects in dielectric coatings, specifically interfacial defects located at the metal–coating boundary, by means of high-voltage non-destructive testing. It is demonstrated that partial discharges causing characteristic distortions of the applied test-voltage pulse can be used as a reliable diagnostic feature of such defects. Using an equivalent capacitive representation of a defective coating, a relationship is established between the apparent charge and the geometry of the air-filled gap. The proposed approach is supported by COMSOL simulations of the electric-field distribution and by experiments performed on Plexiglas specimens containing blind holes of different depths. In addition, a method is developed for isolating the partial-discharge signal based on a weighted sum of increments in the root-mean-square deviations of the second derivative of the voltage waveform. The resulting relationships enable estimation of the residual coating thickness in the defect region.

Keywords: holiday detection; coating defect; dielectric coatings; partial discharges; interfacial defect at the metal–coating interface (interfacial defect)

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MDPI and ACS Style

Syasko, V.; Musikhin, A.; Gnivush, I.; Stepanova, M.; Vinogradova, A. Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing. Coatings 2026, 16, 648. https://doi.org/10.3390/coatings16060648

AMA Style

Syasko V, Musikhin A, Gnivush I, Stepanova M, Vinogradova A. Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing. Coatings. 2026; 16(6):648. https://doi.org/10.3390/coatings16060648

Chicago/Turabian Style

Syasko, Vladimir, Alexey Musikhin, Igor Gnivush, Maria Stepanova, and Anna Vinogradova. 2026. "Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing" Coatings 16, no. 6: 648. https://doi.org/10.3390/coatings16060648

APA Style

Syasko, V., Musikhin, A., Gnivush, I., Stepanova, M., & Vinogradova, A. (2026). Rolled Waterproofing Coating Delamination Detection by High-Voltage Testing. Coatings, 16(6), 648. https://doi.org/10.3390/coatings16060648

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