Document Type

Article

Publication Date

3-1-2025

Publication Title

NDT & E International

Volume

154

Abstract

The estimated global cost of steel atmospheric corrosion is 3-4% of the Gross Domestic Product, despite decades of corrosion mitigation practice. Steel, widely used for infrastructure construction, is composed primarily of iron and therefore is extremely vulnerable to atmospheric corrosion. The free iron atoms are highly reactive with water and oxygen molecules abundantly found in the atmosphere. Common non-contact in-field corrosion detection methods such as visual imaging and passive infrared thermography (IRT) use characteristics of visible corrosion compounds as the main features for corrosion detection. In this study, diffuse spectroscopy is investigated for the feasibility of corrosion detection before visual manifestation. A36 steel samples were exposed to a corrosive alkaline medium with increasing exposure. Sample reflectance spectra were collected in the visual near-infrared (VNIR) and near-infrared (NIR) ranges. The existence of early corrosion products in visual sound samples was verified using X-ray diffraction. Results indicated the presence of corrosion at 600-710 nm in VNIR with a maximum of 97% change with respect to the uncorroded samples. Hyperspectral images at 701.42 nm were analyzed, confirming the presence of corrosion at an incremental rate (2.71-12%) as exposure increased.

First Page

103399

DOI

10.1016/j.ndteint.2025.103399

ISSN

0963-8695

Comments

The Version of Record for this accepted manuscript has been published at:

Das, Amrita, and Sattar Dorafshan. "Feasibility of Hyperspectral Sensing for Detection of Early Stages of Corrosion in Structural Steel." NDT & E International, vol. 154, 2025, article 103399, https://doi.org/10.1016/j.ndteint.2025.103399.

Download

Share

COinS