Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Access content directly
Journal Articles American Heritage Year : 2019

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

Abstract

In the framework of the protection of copper objects exposed to atmospheric corrosion, different solutions are envisaged, among them carboxylate treatments (HC$_{10}$). In this study, an analytical approach based on complementary techniques from micrometer to nanometer scale ($\mu$RS, SEM-EDS, SAM) is used to describe the properties of the corrosion products layer (CPL) and determine the penetration depth of the HC$_{10}$ 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 $\mu$m), mainly composed of Cu$_4$ SO$_4$ (OH)$_6$ , on top of a thinner (1 to 5 $\mu$m thick) cuprite layer, Cu$_2$O, acting as a natural corrosion barrier on the metal. Application of the organic treatment is implemented by immersing the corroded samples in HC$_{10}$ solution, consistent with future requirements for large scale applications. Even for short-term duration (one minute), the HC$_{10}$ treatment penetrates to the cuprite/brochantite interface, but Cu(C$_{10}$)$_2$ 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(C$_{10}$)$_2$ acts as a second inner barrier and prevents liquid infiltration.
Fichier principal
Vignette du fichier
heritage-02-00162.pdf (4.27 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive
Loading...

Dates and versions

cea-02293434 , version 1 (20-09-2019)

Identifiers

Cite

Maëva L'Héronde, Muriel Bouttemy, Florence F. Mercier-Bion, Delphine D. Neff, Emilande Apchain, et al.. Multiscale Study of Interactions Between Corrosion Products Layer Formed on Heritage Cu Objects and Organic Protection Treatments. American Heritage, 2019, 2 (3), pp.2640-2651. ⟨10.3390/heritage2030162⟩. ⟨cea-02293434⟩
74 View
94 Download

Altmetric

Share

Gmail Facebook X LinkedIn More