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Corrosion Prediction of Metallic Cultural Heritage Assets by EIS
E. Angelini,S. Grassini,M. Parvis,F. Zucchi 한국부식방식학회 2019 Corrosion Science and Technology Vol.18 No.4
Electrochemical Impedance Spectroscopy (EIS) was used to predict corrosion behaviour of metallic CulturalHeritage assets in two monitoring campaigns: 1) an iron bar chain exposed indoor from over 500 yearsin the Notre Dame Cathedral in Amiens (France); and 2) a large weathering steel sculpture exposed outdoorfrom tens of years in Ferrara (Italy). The EIS portable instrument employed was battery operated. In situEIS measurements on the iron chain could be used to investigate the phenomena involved in the electrochemicalinterfaces among various corrosion products and assess and predict their corrosion behaviour in differentareas of the Cathedral. Meanwhile, the sculpture of weathering steel, like most outdoor artefacts, showedrust layers of different chemical composition and colour depending on the orientation of metal plates. TheEIS monitoring campaign was carried out on different areas of the artefact surface, allowing assessmentof their protective effectiveness. Results of EIS measurements evidenced how employing a simple test thatcould be performed in situ without damaging the artefacts surface is possible to quickly gain knowledgeof the conservation state of an artefact and highlight potential danger conditions.