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.


Keywords:
Conference Type:
full paper
Faculty:
Design et Arts visuels
Branch:
Conservation
School:
HE-Arc CR
Institute:
Unité de recherche en Conservation-restauration de la Haute Ecole Arc - UR-ARC CR
Subject(s):
Conservation - Restauration
Publisher:
Neuchâtel, Switzerland, 2-6 september 2019
Date:
2019-09
Neuchâtel, Switzerland
2-6 september 2019
Pagination:
4
Published in:
Metal 2019, 9th interim meeting of the ICOM-CC metals working group
Appears in Collection:

Note: The status of this file is: restricted


 Record created 2020-04-01, last modified 2020-10-27

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