Natural based products for cleaning copper and copper alloys artefacts

Article


Macchia, A., Colasanti, I., Rivaroli, L., Favero, G., de Caro, T., Pantoja Munoz, L., Campanella, L. and La Russa, M. 2023. Natural based products for cleaning copper and copper alloys artefacts. Natural Product Research. 37 (7), pp. 1177-1184. https://doi.org/10.1080/14786419.2021.2000408
TypeArticle
TitleNatural based products for cleaning copper and copper alloys artefacts
AuthorsMacchia, A., Colasanti, I., Rivaroli, L., Favero, G., de Caro, T., Pantoja Munoz, L., Campanella, L. and La Russa, M.
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.

KeywordsOrganic Chemistry, Plant Science, Biochemistry, Analytical Chemistry
LanguageEnglish
PublisherTaylor and Francis
JournalNatural Product Research
ISSN1478-6419
Electronic1478-6427
Publication dates
Online09 Nov 2021
Print2023
Publication process dates
Deposited19 Nov 2021
Accepted20 Oct 2021
Output statusPublished
Accepted author manuscript
Copyright Statement

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

Digital Object Identifier (DOI)https://doi.org/10.1080/14786419.2021.2000408
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