Corrosion analysis using a cost-effective and synchronized hyperspectral imaging system

Abstract Carbon steel, bronze and aluminum alloys present excellent properties such as strength, durability, malleability, ductility, heat and electricity conduction, among others. However, these materials are prone to severe corrosion in some aqueous media, and there are few methods to determine the quality according to corrosion rate in a simple manner. In this study, a novel method based on hyperspectral imaging (HSI) in the range of 400 to 650 nm was proposed for the characterization of the corrosion degree in A36 carbon steel, C844 bronze and 6063 aluminum alloys after immersion in basic, neutral and acidic aqueous solutions for 480 h; the corrosion rate was correlated with characteristic hyperspectral response. The results showed that the change in the spectral characteristic response of the corroded samples reflected the severity of corrosion, which was confirmed by comparing the corrosion rates obtained in the weight loss test.