Stabilisation of archaeological copper-alloy objects from chloride-induced active corrosion with Beauveria bassiana

Gutknecht, Naïma (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland) ; Joseph, Edith (Haute Ecole Arc Conservation-Restauration, HES-SO University of Applied Sciences and arts Western Switzerland)

Recent studies have revealed the possibility of using a fungal strain of Beauveria bassiana on copper-alloy artefacts to convert chloride-induced corrosion products into more stable copper oxalates. This study aims to determine the modifications resulting from the green treatment of active corrosion, focusing on archaeological copper surfaces with pitting corrosion and/or tinning. Results showed that synthesised copper chlorides were transformed first into copper hydroxychlorides and then copper oxalates. A development of copper oxalates was also observed on artificially corroded coupons. Moreover, the treatment demonstrated the stabilisation of the active corrosion present on archaeological objects. On tinned surfaces, copper oxalates formed mainly where the tin layer was lacking.


Mots-clés:
Type de conférence:
full paper
Faculté:
Design et Arts visuels
Filière:
Conservation
Ecole:
HE-Arc CR
Institut:
Unité de recherche en Conservation-restauration de la Haute Ecole Arc - UR-ARC CR
Classification:
Conservation - Restauration
Adresse bibliogr.:
Neuchâtel, Switzerland, 2-6 september 2019
Date:
2019-09
Neuchâtel, Switzerland
2-6 september 2019
Pagination:
4
Publié dans:
Metal 2019, 9th interim meeting of the ICOM-CC metals working group
Le document apparaît dans:

Note: The status of this file is: restricted


 Notice créée le 2020-04-01, modifiée le 2020-04-03

Fichiers:
Télécharger le document
PDF

Évaluer ce document:

Rate this document:
1
2
3
 
(Pas encore évalué)