Corrosion Mechanisms for Copper and Silver Objects in Near-Surface Environments

McNeil, M. B.; Little, Brenda J.

doi:10.2307/3179729

Cited by 34 publications

(16 citation statements)

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“…The Raman spectroscopy, XRD and EDX analysis of the samples revealed the alloy of the object was brass alloy which consists of copper and zinc; and the corrosion crust had porous structure with chemical elements: Cu, Zn, S, Cl, O, and Fe. The presence of Cu and Zn was assumed to be the result of microelements in its basic alloy, Fe, Cl, S, and O presented contamination microstructure in the soil [27]. Cuprite is the first product of copper corrosion, forms epitaxial as a product of the direct reaction of copper with dissolved O 2 oxygen or with molecules.…”

Section: Discussionmentioning

confidence: 99%

“…This paper presents the application of Raman microscopy as a non-destructive technique for the identification of minerals, suitable also for single crystals as small as a few hundred micrometers [11][12][13] [14]. The crystals of the copper corrosion minerals were placed and orientated on the stage of a Jasco microscope model (FT/IR-6300 type A), equipped with 10 x and 50 x objectives.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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A Scientific Study of the Patina, Corrosion Morphology, and Conservation of Egyptian Brass Object

Gharib¹

2018

Egyptian Journal of Archaeological and Restoration Studies

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Section: Discussionmentioning

confidence: 99%

Section: Raman Spectroscopymentioning

confidence: 99%

A Scientific Study of the Patina, Corrosion Morphology, and Conservation of Egyptian Brass Object

Gharib¹

2018

Egyptian Journal of Archaeological and Restoration Studies

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“…Thus the metal accumulation was higher than that which would have been expected from precipitation of metal monosulfides alone. This suggests that copper precipitated as Cu 2 S rather than CuS (McNeil & Little, 1992) or that increased amounts of copper and zinc were organically bound (Späth et al, 1998).…”

Section: Characterization Of the Inorganic Solid Phase -Sequential Exmentioning

confidence: 99%

Effects of aerobic–anaerobic transient conditions on sulfur and metal cycles in sewer biofilms

et al. 2005

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A B S T R A C TInteractions between sulfur and metals were studied in aerobic and anaerobic biofilms grown on domestic waste water at 15• C. The dominant metals in the waste water were iron, zinc and copper, which were present in average concentrations of 0.5 mg/l, 0.6 mg/l and 0.1 m/l, respectively. Copper and zinc were found to accumulate in the anaerobic biofilm owing to precipitation of metal sulfides. Iron supplementation (approximately 5.5 mg Fe/l) to the anaerobic waste water reduced the zinc and copper precipitation due to sulfide precipitation with iron. However, even at these elevated iron concentrations in the waste water, sulfide precipitation in the biofilm was controlled largely by zinc and copper. In the aerobic biofilm, addition of iron resulted in accumulation of iron and phosphate, probably owing to precipitation of iron phosphates and iron (oxy)hydroxides. The potential importance of extracellular polymeric substances (EPS) on metal sorption in sewer biofilms was studied. EPS consisted mainly of proteins (13-260 mg/(g volatile solids)) and to a lesser extent of carbohydrates (8-26 mg/(g volatile solids)). The EPS composition remained relatively constant during experimental runs, but differed significantly between them. No relationships between the metal content of the biofilm and the amount of extracted EPS were found, which suggests that EPS did not play a major role in the metal accumulation.

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“…Horn silver objects are stable and are of a greyish aspect [2,11]. In the presence of sulfate-reducing bacteria, silver objects contain silver sulfide (Ag 2 S) and chlorides (AgCl) [12,13]. North et al [3] explained this phenomenon by the alternative exposure of an object in a chloride rich environment to an aerobic (AgCl) and anaerobic (Ag 2 S) environment.…”

Section: Introductionmentioning

confidence: 99%

Degradation of archaeological horn silver artefacts in burials

Marchand¹,

Guilminot²,

Lemoine³

et al. 2014

herit sci

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Background: Archaeological silver objects from burial sites are of a grey-lavender aspect. The formation of AgCl leads to an increase in the volume of the objects, which may undergo a complete transformation into corrosion products. This degradation process has been little studied to date. In this paper, eight horn silver objects were studied by SEM and XRD. Results: Analyses showed a corrosion system composed of bi-layers: a compact inner layer and a porous outer layer. Corrosion products were mainly silver chlorides (AgCl), chlorargyrite. Some objects displayed copper inclusions both in the metallic core and in the inner layer. Highly mineralized objects contained other oxygen-rich phases (with Si, Ca) in the inner layer. Soil markers were detected in the outer layer.

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Corrosion Mechanisms for Copper and Silver Objects in Near-Surface Environments

Cited by 34 publications

References 0 publications

A Scientific Study of the Patina, Corrosion Morphology, and Conservation of Egyptian Brass Object

A Scientific Study of the Patina, Corrosion Morphology, and Conservation of Egyptian Brass Object

Effects of aerobic–anaerobic transient conditions on sulfur and metal cycles in sewer biofilms

Degradation of archaeological horn silver artefacts in burials

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