Articolo in rivista, 2023, ENG, 10.3390/heritage6120395

The Effect of Exposure Condition on the Composition of the Corrosion Layers of the San Carlone of Arona

Petiti C.; Salvadori B.; Vettori S.; Welter J.M.; Guzmán García Lascurain P.; Toniolo L.; Goidanich S.

Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Milano, Italy; CNR-ISPC, Florence, Italy; CNR-ISPC, Florence, Italy; Independent Researcher, Luxembourg, Luxembourg; Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Milano, Italy; Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Milano, Italy; Politecnico di Milano, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta", Milano, Italy

The Colossus of San Carlo Borromeo, named San Carlone for its large dimensions, represents a unique opportunity to study the long-term effects of atmospheric corrosion on patina formation on historic copper sheets. The sculpture's large dimensions, complex geometry, direct visitor interaction, and exposure conditions generate different microclimates. The purpose of this study is to understand how and to what extent these microclimates affect the formation of the copper patinas. The results show that microclimates play a key role in patina formation: in external surfaces exposed to rain, the main constituent is brochantite, whereas a wider variety of corrosion products have been found in sheltered and internal surfaces, such as antlerite, atacamite, copper oxalate, posnjakite, and anglesite.

Heritage (Basel) Online 6 , pp. 7531–7546

Keywords

historic copper, patina of corrosion layers, atmospheric corrosion, cultural heritage, long term patina formation

CNR authors

Salvadori Barbara, Vettori Silvia

CNR institutes

ISPC – Istituto di Scienze del Patrimonio Culturale

ID: 489607

Year: 2023

Type: Articolo in rivista

Creation: 2023-12-07 19:17:48.000

Last update: 2023-12-14 12:25:04.000

External IDs

CNR OAI-PMH: oai:it.cnr:prodotti:489607

DOI: 10.3390/heritage6120395