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Article

Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments

by
Maëva L’héronde
1,2,
Muriel Bouttemy
2,
Florence Mercier-Bion
1,*,
Delphine Neff
1,
Emilande Apchain
1,
Arnaud Etcheberry
2 and
Philippe Dillmann
1
1
LAPA-IRAMAT, NIMBE, CEA, CNRS, Université Paris-Saclay, CEA Saclay, 91191 Gif-sur-Yvette, France
2
Institut Lavoisier de Versailles (ILV), Université de Versailles Saint-Quentin-en-Yvelines, Université Paris-Saclay, CNRS, 45 avenue des États-Unis, 78035 Versailles, France
*
Author to whom correspondence should be addressed.
Heritage 2019, 2(3), 2640-2651; https://doi.org/10.3390/heritage2030162
Submission received: 30 July 2019 / Revised: 27 August 2019 / Accepted: 28 August 2019 / Published: 16 September 2019
(This article belongs to the Special Issue Cultural Heritage—Science, Materials and Technologies)

Abstract

In the framework of the protection of copper objects exposed to atmospheric corrosion, different solutions are envisaged, among them carboxylate treatments (HC10). In this study, an analytical approach based on complementary techniques from micrometer to nanometer scale (μRS, SEM-EDS, SAM) is used to describe the properties of the corrosion products layer (CPL) and determine the penetration depth of the HC10 protection treatment inside the CPL of copper samples issued from the roof of the Saint Martin church in Metz. The CPL consists in a thick brochantite layer (20 to 50 μm), mainly composed of Cu4SO4(OH)6, on top of a thinner (1 to 5 μm thick) cuprite layer, Cu2O, acting as a natural corrosion barrier on the metal. Application of the organic treatment is implemented by immersing the corroded samples in HC10 solution, consistent with future requirements for large scale applications. Even for short-term duration (one minute), the HC10 treatment penetrates to the cuprite/brochantite interface, but Cu(C10)2 precipitate is only detected locally, whereas for a longer immersion of thirty minutes, it is present in higher proportions in the whole brochantite layer, filling the pores, up to the cuprite/brochantite interface. Cu(C10)2 acts as a second inner barrier and prevents liquid infiltration.
Keywords: corrosion; copper; cultural heritage; corrosion inhibitor; carboxylate treatment; Auger spectroscopy corrosion; copper; cultural heritage; corrosion inhibitor; carboxylate treatment; Auger spectroscopy
Graphical Abstract

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MDPI and ACS Style

L’héronde, M.; Bouttemy, M.; Mercier-Bion, F.; Neff, D.; Apchain, E.; Etcheberry, A.; Dillmann, P. Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments. Heritage 2019, 2, 2640-2651. https://doi.org/10.3390/heritage2030162

AMA Style

L’héronde M, Bouttemy M, Mercier-Bion F, Neff D, Apchain E, Etcheberry A, Dillmann P. Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments. Heritage. 2019; 2(3):2640-2651. https://doi.org/10.3390/heritage2030162

Chicago/Turabian Style

L’héronde, Maëva, Muriel Bouttemy, Florence Mercier-Bion, Delphine Neff, Emilande Apchain, Arnaud Etcheberry, and Philippe Dillmann. 2019. "Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments" Heritage 2, no. 3: 2640-2651. https://doi.org/10.3390/heritage2030162

APA Style

L’héronde, M., Bouttemy, M., Mercier-Bion, F., Neff, D., Apchain, E., Etcheberry, A., & Dillmann, P. (2019). Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments. Heritage, 2(3), 2640-2651. https://doi.org/10.3390/heritage2030162

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