NDT methods in artwork corrosion monitoring

Abstract

The interaction of materials with the atmosphere has recently received increased attention. Although the interaction between atmosphere chemistry, weathering and pollutants deposition is complex, there is a need for measuring the surface materials lost through weathering and acid rain by art objects. In fact, data regarding material response to different conditions can be used to predict long-term trends in degradation as well as to assess deterioration process parameters. Conventional inspection techniques, such as ultrasonic measurements or X-ray radiography, can be timeconsuming and/or expensive. In principle, methods to monitor artwork corrosion should have the following features: non-contact nature, fast and inexpensive operations, good sensitivity. In this paper an investigation on detection and monitoring of artwork corrosion by infrared thermography and optical techniques is carried out. In IR thermography, material loss is related to thermal contrast, which is defined as a suitable normalization of temperature differences on the specimen. Optical techniques basically rely on optical contouring, which leads to a 3D map of the surface. Experimental results obtained using simple inversion procedure for IR data are compared with optical results.

Analysis of Iron Anchor Diseases Unearthed from Gudu Ruins in Xianyang City, Shaanxi Province, China

“…The samples in this experiment were seriously rusted, and the scientific analysis and the detection of components and rusty decay products were able to identify the cause of iron anchor corrosion and the degree of rust, to provide a scientific basis for subsequent protection and restoration [17][18][19]. First, the digital image collection of cultural relics samples was conducted and the disease map was drawn.…”

Quantitative characterization of archaeological bronzes based on thermal and compositional analysis

“…Over recent years it has been increasingly used for the detection of subsurface features in cultural heritage (Carlomagno et al, 2005;Gavrilov et al, 2014;Ibarra-Castanedo et al, 2017;Paoloni et al, 2020), such as ancient books (Mercuri et al, 2013;Mercuri, Bonora, et al, 2018), paintings (Ambrosini et al, 2007;Blessley et al, 2014;Tortora et al, 2016) and mosaics (Theodorakeas et al, 2015), characterized by different physical or structural properties with respect to those of the surrounding material. The presence of such features affects the resulting local thermal front propagation within the sample and, consequently, the correspondingly detected PT signal, thus making it possible to carry out depth-resolved quantitative characterizations.…”

Numerical Analysis of Influencing Factors and Capability for Thermal Wave NDT in Liquid Propellant Tank Corrosion Damage Detection

“…Some advantages of ITWNDT as intuitive test results, single-sided testing, non-contact, large area detection and quantitative detection were successfully applied in the aerospace, power generation, automotive, construction and other fields [5]- [10]. S. Marinetti [11]- [12], E. Grizato [13]- [14], D. Ambrosini [15], M. Jonsson [16] and Yang Jing [17] studied the application of ITWNDT in corrosion detection, and achieved relatively good results. Notwithstanding this, the influence factors in the thermal Wave NDT are still not completely exploited.…”