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http://dx.doi.org/10.12654/JCS.2021.37.2.09

A Study on the Stability of Using Alkali Solution Desalination on Gilt Plated Silver-Iron Artifacts  

Park, Jun Hyeon (Department of Heritage Conservation and Restoration, Graduate School of Cultural Heritage, Korea National University of Cultural Heritage)
Bae, Go Woon (Institute of Conservation Science, Korea National University of Cultural Heritage)
Chung, Kwang Yong (Institute of Conservation Science, Korea National University of Cultural Heritage)
Publication Information
Journal of Conservation Science / v.37, no.2, 2021 , pp. 179-189 More about this Journal
Abstract
In this study, the research objects are gilt plated silver-iron nails excavated from the west of the tombs in Neungsan-ri, Buyeo. A gilt plated silver-iron nail was fabricated by combining silver and iron via heating and then gilding amalgam on top of this combination, demonstrating that this ancient artifact that can be replicated using current technology. Since the metal (Au, Ag) surface of these gilt plated artifacts are covered with iron oxide, which slips into the cracks and scratches of the artifacts as well, desalination is essential. Based on the results of the preliminary experiment, the research objects were classified into grades A, B, and C, according to the degree of corrosion and then desalinated using an alkali solution (NaOH, Sodium Sesquicarbonate of 0.1 M) at 60℃. The results demonstrate that the more serious is the degree of corrosion, the more is the amount of Cl- detected. Further, more Cl- was released when NaOH was used than when sodium sesquicarbonate was used, for all grades except Grade A. Furthermore, the more serious is the degree of corrosion, the longer is the desalination period and the reaction with NaOH for all grades except Grade A. A comparison of the Fe composition of the surface before and after desalination shows that Fe composition is the use of NaOH resulted in a smaller increase compared with the use of sodium sesquicarbonate, for all grades except Grade B. However, four of the nails were damaged owing to NaOH (Grade B 3ea, Grade C 1ea) during desalination. Thus, Cl- ions are more stably released when sodium sesquicarbonate is used than when NaOH is used.
Keywords
Gilt plated silver-iron nails; NaOH; Sodium Sesquicarbonate; Desalination;
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