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Updated: Oct 7, 2025

Imaging Corrosion at the Metal-Paint Interface Using Time-of-Flight Secondary Ion Mass Spectrometry
Published on: May 6, 2019
Identification of Corrosion Minerals Using Shortwave Infrared Hyperspectral Imaging
Thomas De Kerf1, Georgios Pipintakos2, Zohreh Zahiri3
1Invilab Research Group, Faculty of Applied Engineering, University of Antwerp, 2020 Antwerp, Belgium.
Abstract:
In this study, we propose a new method to identify corrosion minerals in carbon steel using hyperspectral imaging (HSI) in the shortwave infrared range (900-1700 nm). Seven samples were artificially corroded using a neutral salt spray test and examined using a hyperspectral camera. A normalized cross-correlation algorithm is used to identify four different corrosion minerals (goethite, magnetite, lepidocrocite and hematite), using reference spectra. A Fourier Transform Infrared spectrometer (FTIR) analysis of the scraped corrosion powders was used as a ground truth to validate the results obtained by the hyperspectral camera. This comparison shows that the HSI technique effectively detects the dominant mineral present in the samples. In addition, HSI can also accurately predict the changes in mineral composition that occur over time.
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