Abstract
<p>The monitoring of environmental corrosivity around works of cultural heritage is a key task in the field of both active and preventive conservation. In the case of metallic artworks, this task can be performed by means of coupons or sensors realised with the same materials as the artworks to be conserved. In this work, a measurement system for the development and testing of sensors for atmospheric corrosivity monitoring is presented. The metrological features of the measurement system operated in conjunction with a developed sensor are analysed. The sensor allows for considering the different corrosion behaviours due to the presence of corrosion layers on the object to be preserved. The first developed sensors are made of pre-corroded copper and their resistance is measured. The developed system allows for monitoring thickness loss of over 3 nm in the temperature range of 23 °C – 39 °C. The performed analysis demonstrated that the system presents an efficient laboratory setup for the development and characterisation of sensors for atmospheric corrosivity monitoring.</p><div> </div>
Highlights
The monitoring process plays a crucial role in the preservation of metallic artworks
In the preliminary design phase, we considered different environmental conditions leading to different corrosion rates ranging from 100 μm/year to 5·10−3 μm/year
It can be stated that the best trade off in terms of accuracy and time was achieved with TD = 5 s and number of PLCs (NPLC) = 5, with the standard deviation on the standard resistance reaching a value of 3.7‧10−6 Ω and the sensor resistance reaching a value of 8.7‧10−6 Ω under these conditions
Summary
The monitoring process plays a crucial role in the preservation of metallic artworks. The real-time monitoring of environmental corrosivity is a important tool for the appropriate preservation of works of art. Such an approach allows for checking whether the environment could be harmful to the artefacts and for selecting the most appropriate conservation solutions. One possible solution is to expose both the object to be monitored and a sample made with the same alloy to the same environmental conditions This approach offers the opportunity to perform invasive measurements on the specimen without damaging the work of art [3]-[7]. An initial test of the corrosion monitoring via pre-corroded copperbased sensors in high humidity conditions is reported
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