Metallic artifacts, meticulously conserved for centuries, often face severe corrosion when exposed to common atmospheric chemicals upon removal from their original sites. This ongoing corrosion study is crucial as it sheds light on the contributing factors.
Metal artifacts may be covered with either artificial or natural patinas, which depend on exposure conditions, especially in specific thermal contexts. Unfortunately, the storage conditions in this case did not promote optimal preservation, resulting in visibly heterogeneous patinas.
To design an effective conservation strategy, it is essential to study differentially corroded areas. This strategy should include controlled cleaning interventions, identification of an optimal protection level, and continuous monitoring of corrosive processes.
Collaborative research on the ongoing corrosion of discovered statues involves several institutions:
1. University of Genoa (UNIGE)
2. Superintendence of Archeology, Cultural Heritage, and Landscape of the provinces of Siena, Grosseto, Arezzo (Sabap-Si)
3. University for Foreigners of Siena (UNISTRASI)
4. Central Institute for Restoration (ICR)
Method and Instruments:
The METAL group at the University of Genoa developed an in-situ probe for characterizing patinas using electrochemical techniques. Specifically, they employed Electrochemical Impedance Spectroscopy and Linear Sweep Voltammetry with the portable PalmSens4 device. This approach allowed them to analyze data directly in the field and provide immediate feedback to restoration experts using PSTrace software.
Results:
The electrochemical measurements not only guided restoration decisions for preserving, cleaning, and stabilizing the artifacts but also facilitated a rigorous evaluation of the long-term effectiveness of the preservation strategy. This practical application of findings ensures confidence in the preservation efforts.
