A Study on Manufacturing Technique and Corrosion Characteristics of Bronze Dirk, Bronze Sword, Bronze Mirror in Early Iron Age Excavated from the Osong Site in Cheongju

IF 0.6 0 ART

International Journal of Conservation Science Pub Date : 2023-03-20 DOI:10.12654/jcs.2023.39.1.06

Woo Hyun Kim, Ji Min Jeon, N. Cho

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Abstract

Metallography, SEM-EDS, and Raman Micro-Spectroscopy analysis were conducted on bronze dirk, bronze sword, and bronze mirror excavated from the pit tomb No. 1-1 at 12th Point of Osong Site in Cheongju to study the manufacturing techniques and corrosion properties. The bronze dirk, bronze sword and bronze mirror are judged to be binary alloys of Cu(79.16∼79.89 wt%)-Sn (19.12∼20.34 wt%). The microstructure is a cast structure composed of δ phase and (α+δ) eutectoid, and no heat treatment was performed. As a result of classifying the corrosion characteristics, it was confirmed that the bronze dirk, bronze sword, bronze mirror were Type I. As a result of EDS analysis in subsurface area, tin oxide is located as a selective corrosion of (α+δ) eutectoid, and as a result of Raman Micro-Spectroscopy analysis, corrosion products of Cassiterite and Malachite were identified for the bronze dirk and Cassiterite for bronze sword and bronze mirror. The secondary metallic copper was mainly present in the hole left by corrosion of Pb particles and on the (α+δ) eutectoid, and was found to be 100.00 wt% of Cu as a result of the analysis, confirming that all of them were high-purity copper.

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清州五松遗址出土早期铁器时代青铜剑、青铜剑、青铜镜的制作工艺及腐蚀特征研究

对清州市五松遗址12点1-1号坑墓出土的青铜剑、青铜剑、青铜镜等进行了金相、SEM-EDS、拉曼显微光谱等分析，研究了制作工艺和腐蚀性能。青铜剑、青铜剑和青铜镜被判定为铜(79.16 ~ 79.89 wt%)-锡(19.12 ~ 20.34 wt%)二元合金。组织为δ相和(α+δ)共析组成的铸态组织，未经热处理。通过对铜匕首、铜剑、铜镜的腐蚀特征进行分类，确定了铜匕首、铜剑、铜镜的腐蚀类型为ⅰ型。在亚表面EDS分析中，氧化锡被定位为(α+δ)共析的选择性腐蚀产物;在拉曼显微光谱分析中，铜匕首和铜剑、铜镜的腐蚀产物分别被鉴定为锡石和孔雀石。次级金属铜主要存在于Pb颗粒腐蚀留下的孔洞和(α+δ)共析上，分析结果表明铜的含量为100.00 wt%，均为高纯铜。

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来源期刊

International Journal of Conservation Science ART-

CiteScore

1.70

自引率

37.50%

发文量

审稿时长

10 weeks

期刊介绍： The International Journal of Conservation Science (IJCS) is a high quality peer-reviewed journal devoted to the publication of original research papers in applied conservation science and its broad range of applications. IJCS it is an open access journal. All content is freely available without charge to any user or his/her institution. Users are allowed to read, download, copy, distribute, print, search, or link to the full texts of the articles in this journal without asking prior permission from the publisher or the author. The topics cover all disciplines and branches of modern scientific conservation, including different aspects on general conservation theory, scientific investigation of works of art, authentication, determination of conservation state, compatibility studies for preservation and restoration procedures and monitoring of interventions effectiveness, etiopathology of historic and natural monuments, studies on the mechanisms of deterioration and degradation for different materials as structural and ornamental elements, impact of the environmental factors or agents on monuments and ecosystems, obtaining and characterization of new materials and procedures for preservation and restoration, new methodologies for scientific investigation, cross-related problems concerning research applied to conservation science, biodiversity conservation. Review articles in selected areas are published from time to time.