TERAHERTZ NONDESTRUCTIVE EVALUATION OF CORRODING MULTILAYER PAINT STACKS

Document Type

Article

Publication Date

5-1-2024

Abstract

This paper showcases terahertz nondestructive detection of corrosion buried underneath a multilayer paint stack. Periodically, during the accelerated corrosion protocol, samples are removed from the environmental chambers and characterized using terahertz pulse imaging. Analysis of the reflected waveforms indicates that corrosion leads to a decrease in the amplitude of the deconvoluted pulse, which reflects from the metallic layer. The decrease in amplitude results from a roughening of the metallic surface with corrosion. Surface roughness increases with corrosion, eventually leading to detachment of the multilayer paint stack from the substrate.

Identifier

85199549923 (Scopus)

Publication Title

Materials Evaluation

External Full Text Location

https://doi.org/10.32548/2024.me-04360

ISSN

00255327

First Page

40

Last Page

50

Issue

5

Volume

82

Fund Ref

Strategic Environmental Research and Development Program

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