충북 청주 오송유적 출토 초기철기시대 동사, 동검, 동경의 제작기법 및 부식특성 연구
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
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초록
청주 오송유적 12지점 1-1호 토광묘 출토 동사, 동검, 동경을 대상으로 금속현미경,SEM-EDS, 라만 마이크로분광분석을 실시하여 제작기법과 부식특성을 연구하였다. 동사, 동검, 동경은 Cu(79.16∼79.89 wt%)-Sn(19.12∼20.34 wt%)의 이원계 합금으로 판단된다. 미세조직은 δ상과(α+δ) 공석상으로 구성된 주조조직으로 어떠한 열처리 가공도 이루어지지 않았다. 부식특성을 분류한 결과 동사, 동검, 동경은 유형Ⅰ로 확인된다. 표면 아래 영역은 EDS 분석 결과 (α+δ) 공석상의선택부식으로 주석산화물이 위치하고, 표면부는 Raman 분석 결과 동사는 Cassiterite와 Malachite,동검과 동경은 Cassiterite의 부식생성물이 동정 되었다. 이차생성구리는 주로 Pb입자가 부식되어빠지고 남은 hole, (α+δ) 공석상에 존재하였고 분석결과 100.00 wt% Cu가 검출되어 모두 고순도구리인 것을 확인하였다.
Abstract
Metallography, SEM-EDS, and Raman Micro-Spectroscopy analysis were conducted onbronze dirk, bronze sword, and bronze mirror excavated from the pit tomb No. 1-1 at 12th Pointof Osong Site in Cheongju to study the manufacturing techniques and corrosion properties. The bronzedirk, 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 wasconfirmed that the bronze dirk, bronze sword, bronze mirror were Type I. As a result of EDS analysisin subsurface area, tin oxide is located as a selective corrosion of (α+δ) eutectoid, and as a resultof Raman Micro-Spectroscopy analysis, corrosion products of Cassiterite and Malachite were identifiedfor the bronze dirk and Cassiterite for bronze sword and bronze mirror. The secondary metallic copperwas mainly present in the hole left by corrosion of Pb particles and on the (α+δ) eutectoid, and wasfound to be 100.00 wt% of Cu as a result of the analysis, confirming that all of them were high-puritycopper.
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