Research Paper
Analysis of the Decuprification Process in the Corrosion Behavior of a Bronze Dagger

Alamirzaei, Fatemeh; Naeimi Taraei, Parasto

doi:10.61882/kcr.7.3.16

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Volume 7, Issue 3 (11-2024) KCR 2024, 7(3): 16-28 | Back to browse issues page

‎ 10.61882/kcr.7.3.16

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Alamirzaei F, Naeimi Taraei P. Research Paper Analysis of the Decuprification Process in the Corrosion Behavior of a Bronze Dagger. KCR 2024; 7 (3) :16-28
URL: http://journal.richt.ir/kcr/article-1-221-en.html

Research Paper Analysis of the Decuprification Process in the Corrosion Behavior of a Bronze Dagger

Fatemeh Alamirzaei

, Parasto Naeimi Taraei ^*

Ph.D. in Conservation and Restoration, Researcher in the Field of Metal Artifacts.

Abstract: (1369 Views)

The study of corrosion mechanisms in ancient bronze artifacts, particularly those from the salty and humid region of Hormuz, is crucial due to severe corrosion. This article examines a bronze dagger attributed to excavations in Hormuz to analyze its corrosion behavior influenced by the environment. Techniques such as X-ray imaging, stereomicroscopy, X-ray diffraction (XRD), polarized light microscopy (PLM), and scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM-EDX) were employed. Results show that most of the dagger has transformed into corrosion products, including copper and tin oxides, as well as basic chloride compounds like atacamite and paratacamite, forming a three-layered corrosion structure. The corrosion mechanism involves selective dissolution of copper, its migration to outer layers, and the concentration of tin oxide compounds in the central regions, accompanied by chloride ion penetration. This process has preserved patterns of grain structure and thermal twinning in the inner oxide layers, with periodic deposition of copper and tin oxides indicating the formation of a colloidal solution of copper and tin salts beneath the soil (Scott, 2002; Robbiola et al., 1998).

Keywords: Corrosion, tin bronze, historic Hormuz Castle, selective copper dissolution, copper oxide, tin oxide.

Full-Text [PDF 3917 kb] (285 Downloads)

Type of Study: Research, Original, Regular | Subject: Application of modern sciences, technologies, equipment, materials and methods
Received: 2024/07/26 | Accepted: 2024/11/15 | Published: 2024/11/30

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