Natural based products for cleaning copper and copper alloys artefacts

Macchia, Andrea, Colasanti, Irene Angela, Rivaroli, Laura, Favero, Gabriele ORCID logoORCID: https://orcid.org/0000-0001-6650-7216, de Caro, Tilde, Pantoja Munoz, Leonardo ORCID logoORCID: https://orcid.org/0000-0001-8364-7595, Campanella, Luigi and La Russa, Mauro Francesco (2021) Natural based products for cleaning copper and copper alloys artefacts. Natural Product Research . pp. 1-8. ISSN 1478-6419 [Article] (Published online first) (doi:10.1080/14786419.2021.2000408)

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Abstract

Copper alloys objects can deteriorate their conservation state through irreversible corrosion. Since in the cultural heritage field every artefact is unique and any loss irreplaceable, solutions for conservation are needed. Hence, there is the necessity to stop the corrosion process with a suitable cleaning and conservation process to avoid further degradation processes without changing its morphological aspect. Chelating solutions are commonly used in chemical cleaning, mainly sodium salts of ethylenediaminetetraacetic acid (EDTA). However, it is resistant to water purification procedures and is not biodegradable. The goal of this study was to see if applying an ecologically friendly chelating agent as an alternative to EDTA cleaning procedures for cultural heritage was suitable. In this study were chosen six natural-based chelators that could be a new green non-toxic alternative to EDTA in corrosion-inhibiting properties. They were tested for cleaning copper artefacts exposed to atmospheric environment in polluted areas. The study considered four amino acids, a glucoheptonate (CSA) and an industrial green chelator (GLDA). The effectiveness was tested on corrosion copper compounds and on laboratory corroded copper sheets. Finally, the cleaning efficacy was tested on four Roman coins and a modern copper painting. To define the cleaning efficacy, surface analytical investigations have been carried out by means ICP-OES, UV-VIS, µ-Raman, spectro-colorimetry, XRD and FTIR. Among the amino acids, alanine was the most effective, showing an unaltered noble patina and a good effective copper recovery from corrosion patinas.

Item Type: Article
Keywords (uncontrolled): Organic Chemistry, Plant Science, Biochemistry, Analytical Chemistry
Research Areas: A. > School of Science and Technology > Natural Sciences
Item ID: 34189
Notes on copyright: This is an Accepted Manuscript of an article published by Taylor & Francis in Natural Product Research on 09/11/2021, available online: http://www.tandfonline.com/10.1080/14786419.2021.2000408
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Depositing User: Jisc Publications Router
Date Deposited: 19 Nov 2021 12:29
Last Modified: 08 Jun 2022 11:23
URI: https://eprints.mdx.ac.uk/id/eprint/34189

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