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Insights into electrolytic stabilization with weak polarization as treatment for archaeological copper objects.
- Source :
- Analytical & Bioanalytical Chemistry; Feb2007, Vol. 387 Issue 3, p861-868, 8p, 2 Color Photographs, 1 Black and White Photograph, 2 Diagrams, 3 Graphs
- Publication Year :
- 2007
-
Abstract
- Immersion of corroded copper artefacts in dilute sodium sesquicarbonate solution is a well-recognized stabilization technique—especially in the conservation of objects recovered from marine environments and therefore saturated with chlorides. Here we describe three linked experiments performed to investigate a variation on this treatment, involving the application of a low potential to the artefact in order to drive the chloride extraction process. This includes a new spectroelectrochemical approach which allows 2-D pseudorandom X-ray reflection diffraction patterns to be obtained without interrupting the reaction in solution. Experiments were carried out on synthetically produced chloride layers on copper (nantokite and atacamite). We show that a thick chloride layer is, in general, replaced by a thin cuprite layer through a mechanism which involves detachment of the chloride crystallites from the surface prior to dissolution. [ABSTRACT FROM AUTHOR]
- Subjects :
- COPPER
CHLORIDES
EXTRACTION (Chemistry)
X-ray diffraction
MARINE pollution
Subjects
Details
- Language :
- English
- ISSN :
- 16182642
- Volume :
- 387
- Issue :
- 3
- Database :
- Complementary Index
- Journal :
- Analytical & Bioanalytical Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 23819318
- Full Text :
- https://doi.org/10.1007/s00216-006-0835-1